The catalog that everybody's been talking about is now available at your favorite K C dealer. You’ll find 80 pages of color photos, complete descriptions, and all the technical information you need. It's the complete collection of all of our exciting lines

If your dealer doesn't have them in stock, ask him to you one from his distributor. But hurry, supply is limited and this is one catalog you don't want to be without.

Exciting, innovative designs that put you in complete control. Every kit features Plura ready-made fuselages and ^ Siros wing panels. Robbe airplanes ^ andgliders SHIPS C j ^ ^ b u i l d up fast, look great. and outperform just about a n y t h i n g H a M L ^ else in the air. There's something for evenone. Yachts, scale tugs, sail boats, luggers, fire-fighting boats, and m ore... all designed with the emphasis on detail. W hichever Robbe boat you choose, you'll get a proven winner that steals the show every time.

ACCESSORIES

Look at our complete selection of accessories. High performance motors, special fittings, starters, quick chargers, propellers... everything you need. You'll even find an exciting line of sound effects generators for extra realism.

R C manufacturer I

much. So. don't delay, pick up your

ROBBE MODEL SPORT. Princeton Meadows The Office Suite 2D.Plainsboro. NJ 08536 Artists.

Plus $5.00 shipping ond handling

his is one of o series of limited edition the artist, and accompanied by a certificate of 1 J collector prints to be produced from pointings authenticity. Prints rolled and shipped in sturdy j by artist Bob Benjamin, most of which have first tube, UPS insured, ready for professional appeared publicly on the cover of MODEL mounting and framing. BUILDER Magazine. Prints will be allocated based on postmarked* Only 500 prints are available, each per­ date of order. Checks received after 500th print j sonally inspected, signed, and numbered by is sold will be returned uncashed.

To be filled In by PRINT ORDER FORM Send check to: MODEL BUILDER MAGAZINE MODEL BUILDER Attention: LIMITED EDITION PRINTS Box 10335. C O STA M ESA. CA 92627 PRINT NO. . PLEASE SHIP ME A LIMITED EDITION LITHO PRINT OF ROBT. A. BENJAMIN'S I Please indicate in numerical PAINTING OF HAROLD KRIER'S GREAT LAKES SPECIAL. A CHECK OR MONEY \ order your preference for the ORDER FOR $50.00 PLUS $5.00 FOR SHIPPING AND HANDLING IS ENCLOSED. i nex t limited edition print CALIFORNIA RESIDENTS ADD 6% SALES TAX. (714 ) 645-8830 NAME STREET \ U j-3 C u b □ P-43 (Please print) i O Franklin Sport CITY, STATE, ZIP ! □ Waco YKS-7 □ Monocoupe Clip this coupon or make a copy

■I V d i M O D EL S' FEBRUARY 1984

BUILDER volume 14, number 145 621 West Nineteenth St., Box 10335, Costa Mesa, CA 92627-0132 Phone: (714) 645-8830

STAFF TABLE OF CONTENTS EDIT OR/PUBLISHER Wm. C. Northrop, Jr. FEATURES GENERAL MANAGER Anita Northrop W O R K B E N C H , Bill Northrop...... 6 ASSISTANT GENERAL MANAGER Dawn Johnson DEAR J A K E ...... 6 PRODUCTION MANAGER O VER THE C O U N T E R ...... 7 Bill Forrey

FAI W O R L D A E R O B A T IC C H A M P IO N S H IP S , Bill Northrop...... 11 PRODUCTION ARTIST Howard Millman KITCHNER/WATERLOO SCALE RALLY, CliffTacie...... 18 DRAWINGS BY FUEL LINES, )oe Klause...... 21 Al Patterson ELECTRIC P O W E R , Mitch Poling...... 22 ACCOUNTING DEPT. MANAGER BIG BIRD S, Al Alman...... 24 Michael Whitney SUBSCRIPTIONS H O W T O FLY PATTER N, Dick Hanson...... 26 Jo Anne Glenn C H O PPER C H A T T E R , Ray Hostetler...... 30 CONTRIBUTING EDITORS ELOY'S BIG B IR D , P A R T T W O , EloyMarez ...... 32 Al Alman Eloy Marez PLUG SPARKS, lohnPond ...... 35 Jerry Dunlap Walt Mooney Bill Forrey Mitch Poling R /C S O A R IN G , BillForrey...... 40 Bill Hannan John Pond ELECTRONICS CORNER, EloyMarez...... 43 Dick Hanson Fernando Ramos Mike Hazel Dan Rutherford M R C S K Y H A W K II IN R EVIEW , EloyMarez...... 44 Ray Hostetler John Smith R /C B O A T S , Jerry Dunlap ...... 46 Ken Johnson Bob Stalick Joe Klause C O N T R O L LINE, Mike Hazel...... 48 R /C CARS, Dan Rutherford...... 52 ADVERTISING REPRESENTATIVES H A N N A N ’S H A N G A R , Bill Hannan...... 54 Bill Northrop FREE FLIG H T, BobStalick...... 56 Home Office, Costa Mesa Al Novotnik F/F SCALE, Fernando Ramos...... 60 4 Beverly PI., Norwalk, CT 06850 IN D O O R , Ken Johnson...... 62 Bus. Phone (203) 847-7478 MODEL BUILDER (ISSN 0194 7079) is published monthly by RCMB INC., 621 CONSTRUCTION West 19lh St.. Box 10335. Costa Mesa. California 92627-0132. Phone (714) 645-8830. BITTY-BIPE, Jim “ Doc” Edwards ...... 16 Subscriptions: S25.00 per year. $47.00 for VOLTS WAGON, Woody W oodw ard...... 27 two years. Single copies $2.50. Subscriptions outside the US (except APO & FPO) $32.00 THE DIAM OND O.T., R o yW risto n ...... 38 for one year only. All payments must be in US lunds, drawn on a US bank. PEANUT CRACKERJACK, Walt Mooney ...... 49 Copyright 1983 by RCMB INC. All rights reserved. Reproduction without permis­ sion prohibited. COVER: Few things go together better than a beautiful girl and a beautiful glider. This month's cover is proof! May we introduce you to Cindy Fuller, of San Rafael Change of address notices must be received California, and her Astro Flight Californian. The scenic location is one of the North six weeks before date of issue that new Bay Soaring Society's flying fields somewhere in the Napa-Sonoma wine country of address takes effect. Send old address with California. new. old label preferred. Post Office will COVER INSET: The colorful flags of the various participating countries at the 1983 not forward copies unless you pay extra W orld Aerobatic Championships wave in Pensacola, Florida's warm breezes as specta­ postage. Duplicate issues cannot be sent. tors watch the precision flying of 70 of the world's best pattern pilots. See page 11 for coverage of the event. Color transparencies by Ed Wood and Bill Northrop. Second class postage paid at Costa Mesa. California, and additional offices.

MODEL BUILDER “HOT STUFF” & tmPIB ‘TT? MODELING’S ONLY ALL AMERICAN INSTANT GLUES BAR NONE! THAT’S RIGHT. FROM THE VERY BEGINNING OF THE “ HOT STUFF,’* REVOLUTION, IN 1971, “ HOT STUFF’’ PRODUCTS HAVE BEEN TOTALLY AMERICAN. fafctäte Cäfr CONTINUES THIS p o l ic y w it h t h e introduction o f “ HOT TIPS’! OUR EXCLUSIVE NEW APPLICATOR TOP. . f “HOT TIPS’’ DESIGNED BY MODELERS FOR MODELERS — EXCLUSIVE FEATURES— 1. FINEST TIP Gives you best control for each application 2. LONGEST SPOUT For those hard-to-get-at jobs 3. EXCELLENT DRAINAGE Helps keep the clogs away 4. RETRACTING CAP One twist keeps cap far away from tip 5. DRIP GUARD Helps keep excess glue away from fingers 6. BUILT-IN TUBING HOLDER FOR 12 YEARS Tubing supplied to use if you wish MODEL BUILDING’S (1 /2 oz. & 2 oz. only) STATE OF THE ART _ INSTANT GLUES HST-1 % OZ. HS-3 2.9S 3 OZ. 3.95 “ HOT SHOT" HS-1 % OZ. HS-4 ECONOMY 2.95 2 OZ 9.95

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t l · * ' COMPACT SPORT & PATTERN MODEL FOR .60 ENGINES Engine: .60 WingSpan: 58" Designed by CLAUDE McCULLOUGH Wing Area: 700 Sq. In. 5 IG Approx. Weight: 7-1/2 Lbs. For years modelers have told us we should have a .60-sized Kougar. We've done this sug­ (Without retracts or tuned pipe) gestion one better, incorporating the newer lines of our little Kobra with the great flying KIT FEATURES: capabilities of the Kougar. With a spectacular roll rate, dazzling vertical climb and forgiv­ Pre-Cut Foam Wing ing low speed handling performance, this sleek new model can make an average Sunday Handy Printed Fuselage Sides - Build flier look like an expert stunt champion. Directly on the Wood Formed Plastic Fuselage Top Jet Style Canopy with Molded Framing Molded Plastic Cowling Sheet Balsa Wing Covering Sheet Balsa Fin Built-Up Airfoil Stabilizer Rugged, Ready-Bend Landing Gear Die-Cut Plywood Parts 32 Page Photo-Instruction Book with Step-By-Step Instructions Fiberglass Wing Tape Full-Size Plan HARDWARE PACKAGE INCLUDES: Molded Control Hinges Nylon Control Horns Nylon Nose Gear Bearing Nylon Nose Gear Steering Arm RC Links One of the notable qualities ot the Kougar has been its tine low speed handling. The same built-in wing washout that Heavy-Duty Aluminum Motor Mounts contributes to this characteristic has been incorporated into the King Kobra. As this picture shows, it can also be slowed Wire Aileron Horns down tor easy, nose-high touchdowns on the main gear. Nylon Screws for Bolt-On Wing Attachment sig? BUY FROM AUTHORIZED SIG DEALERS ? sig GRAND JUNCTION QUINCY EAST LANSING NEW MEXICO OKLAHOMA BELLINGHAM CULLMAN Aero Rail Hobbies Qumcy Hobby Center Rider s Hobby Shop ALBUQUERQUE OKLAHOMA CITY Hobby Hrve Chaney’s R/C Hobby Supplies 1141 N 25th St 3632 Marne 920 Trowbridge Road Valley Hobbies Campbell's Hobby House 111 E Magnolia 601 5th St SW Plaza 25 ROCKFORD FARMINGTON 4522 4th St N W 3500 N MacArthur CASTLE ROCK PH 205 734 2402 GRAND JUNCTION Rockford Hobbies. Inc Joe's Hobby Center. Inc PH 505 345 9688 TULSA Aero Motive Products HOMEWOOO The Hobby Hut 619 So Rockford Avenue 35203 Grand River Ave CARLSBAD House of Hobbies 607 Spirit Lake Highway Homewood Toy 4 Hobby 1125 27 N Ave WAUKEGAN PH 3134778266 The Schettlers 6914 E Admiral Place KENT 2830 S 18th St CONNECTICUT lake County Hobbies FARWELL 1009 N Eighth St OREGON Kent Hobby MOBILE BRISTOL 3102 N Sheridan Road Lockwood Aero A Hobby Shop NEW YORK CORVALLIS 1313 W Γ Dix»e Hobby Crafts Bristol Hobby Center. Inc PH 3126624544 3060 N County Line Road BROOKLYN Trump's (OJ's) Hobbies Suite 110 * 3077 Dauphim Street 641 Farmington Ave INDtANA FLINT Brooklyn's Model Masters 1875 N W 9th St PUYALLUP MONTGOMERY Bristol Ptaza INDIANAPOLIS Rider's Hobby Shop 1307 Gravesend Neck Road PH 503-753-7540 Fir grove Model Supply Modelers Supply PH 5837273 West s*de Hobby 3012 Corunna Road PH 212-339-9250 PORTLAND 10611 136th St East (Mail Order Catalog Sales) DANBURY 5235 Rockville Road KALAMAZOO BROOKLYN Strictly R/C PH 845 7675 Box 7185 The Hobby Center IOWA Rider 's Hobby Shop Walt's Hobby Shop 7868 S w Capitol Highway SEATTLE PH 205-263-2634 366 Mam St COUNCIL BLUFFS 3417 So Westnedge 7909 5th Ave PENNSYLVANIA Webster Supply Co ALASKA GLASTONBURY Bud s Hobbies A Crafts PONTIAC PH 212 745-4991 BATH 17818 Aurora Ave N ANCHORAGE Davis Hobbies 133 W Broadway RC Hobbies DEPEW Dick Wetzel's Hobbies TACOMA Anchorage House of Hobbies Fox Run Mall DES MOINES 921 Huron Depew Hobby Center 514 E Mem St Bill's Hobby Town 604 C Street 272 1043 NORWALK Iowa Service Company ROCHESTER 5866 Transit Road PH 215-837 6681 14914 Pacific Ave 4211 Spenard Road Al’s Hobbies 2706 Beaver Ave Trackside Hobb*s PH 684 5555 LANCASTER PH 206-531-8111 3521 Mt View Drive 54 Chestnut Hill Road WATERLOO 418 Mam Street EAST ISIIP The Flight Box WALLA WALLA 8225 Old Seward WATERFORD Bob's R1C Supply SAGINAW Hobby World Lancaster Shopping Center Harley's R C ANCHORAGE Shoreline Craft 432 Ardmore Tart's Hobby Shop #2 232 E . Mam Street LANSOALE Route 1. Box 277A Diamond Center 5 Hayes St P.O. Box 222 KANSAS C 326 Fashion Square Mali PH 516-277 4499 Penn Valley Hobby Ctr PH 509 529-2618 800 East Dimond BNd PH 4431458 KANSAS CITY SAULT ST MARIE ELMSFORD 837 W Mam St WEST VIRGINIA Suite 136 FLORIDA R/C HOBBIES Pinnacle Hobby Shop Andy's Hobby Shop LEHIGHTON CHARLESTON ARIZONA CAPE CORAL 5620 state Ave 129 E Portage Ave 36 Main Street Carpenter Hobbies Fountain Hobby Center PHOENIX A & J Models. Inc. LIBERAL TAWAS CITY KINGSTON Rt 5 Box 337 200 W Washington St Exeter Hobbies 1928 Del Prado Blvd Miller's Bike A Hobby Shop Great Lakes Model A Mold Co J A J's Hobbies. Inc MILTON WISCONSIN 3285 E McDowell Rd CAPE CORAL 105 E Seventh 412 Margo Street 785 8roadway Kreb's Newstand MARSHFIELD PHOENIX Uncle Bob's Country Store SALINA TRAVERSE CITY ROCHESTER 83 Broadway Mid Wisconsin Hobby Center The Hobby Bench Hobby Supply Mr Hobby Ray's RedKvControl Shop Dan's Crafts A Things NAZARETH Northway Mall 19th Avenue & Northern 4730-D SE 15th Ave Kraft Manor 517 So. Union 352 Empire Blvd Trainland U S A 503 E Ives St PHOENIX PH 813-945-0900 1857 South 9th PH 616 947 4949 ROCHESTER 105 Beivxlere Street MENOMONIE Hobby Bench CAPE CORAL WICHITA UTICA G A G Hobbies READING True Value Hardware Paradise Valley Mall Universal Hobbies The Hobby Shop Henderson’s Hobbies 1339 Dewey Ave Iron Horse Hobby House 1512 9th Street 4550 E Cactus Rd 9801 W Sample 954 South Oliver 2441 Auburn ROCHESTER 60 South 6th St l Mart Shopping Ctr SEDONA INTERLACHEN KENTUCKY WARREN Panco Hobbies READING MILWAUKEE My Hobby Shop Field's Hobby Shop. Inc LEXINGTON Prop Shop Hobbies 2676 East Ridge Road Ott's Hobbies All tn 1 Hobby Smith s Corner Stnckland Road X-Cell Models. Inc 23044 Van Dyke SYRACUSE 536 N. 10th St Sooth Gate Mall PH 602 282 1290 P 0 Box 1063 347 Eastland Shopping Ctr 1 Block N ο» 9 Mile Walt's Hobby A Craft SLATINGTON 333 So 27th Street TUCSON LEES8URG PH 606-2542406 WYANDOLLE 4300 W Genesee St Valley Hobbies & Collectibles PH 4148454555 Tucson Hobby Shop Top Value Hobby LOUISIANA Stoner Hobby Center UTICA 102 Mam Street MILWAUKEE 4352 E Speedway 2740 North Hwy 441 27 BATON ROUGE 145 Maple St American Hobby A Sports WARMINSTER Casanova's Hobby WICKENBURG Fruitland Park Plaza Hobby Towne PH 313-283 2355 2107 Whitesboro Street JC R/C Hobbies 1423 S MuskegoAve Lane's Toyland & Hobbies MELBOURNE 3112 College Drive Suite A MINNESOTA PH 315 724 4959 13 York Rood PH 414872 2700 81 N. Valentine Ernie's Hobby Shop MANDEVILLE BLOOMINGTON NORTH CAROLINA PH: 215872 5200 WAUSAU ARKANSAS 631 Apollo Blvd Mercury Hobbies. Inc Jolly's Hobbies A Crafts CHARLOTTE WAYNE Pope's Hobby Land FAYETTEVILLE MIAMI Rt 6 Box 734A 7935 Southtown Center Respcaplnc Science Hobbies Hyatt Hobby House 640 South 3rd Ave Collier Air Crafts Crown Hobbies METAIRIE CRYSTAL 2615 Central Ave Gateway Shopping Center EDEN 1610 Foxhunter Road 7439 Coral Way M 4 M's Hobby Art A Craft Ctr Crystal Schwinn Cydery PH 215887 2244 CANADA LITTLE ROCK MIAMI 5229 Veterans Blvd 6324 Bass Lake Rood Coke's Fix-it A Hobby Shop RHODE ISLAND BAWLF ALBERTA Sherrill’s House of Hobbies Orange Blossom Hobbies. Inc HEW ORLEANS DULUTH Rt 2 Box 222 EAST PROVIDENCE B 4 P Transport Ltd 3408 S University Ave 1975 NW 36th Street PH 9198270166 Pel A Hobby Center Carrs Hobbies A 4 R Hobbies Box 6 Hall Plata Shopping Center ORLANDO 4035 Touro Street 2014 West Superior Street GREENSBORO 56 Alice St PH 373-3953 PH 562 8230 Bob’s Hobby Center. Inc. WESTWEGO RICHFIELD Sports A Hobbies Unlimited PH 401-438 2754 CALGARY ALBERTA NORTH LITTLE ROCK 7333 Lake Underhill Road 2144 Lawndale Drive Clark's Hobby A Craft Center Hub Hobby Center SOUTH CAROLINA Hobby world Canada Madijo Hobby House PENSACOLA 729 Westbank Expressway 16 W 66th Street Lawndale Shopping Center GREENVILLE Box 968 Stn M 4212 McArthur Drive Bobe's Hobby House MAINE ST PAUl HENDERSONVILLE The Great Escape CALGARY. ALBERTA CALIFORNIA 5719 North W Street WATERVILLE Gulliver's The Hobby House Pleasantburg Shopping Center P M S Hobby Craft BURBANK 1526 W Larpenteur PLANTATION JFK Hobby A Craft Ctr Inc 1211 Asheville Hwy 1426 Laurens Road Calgary North Hifl Centre T & A Hobby Lobby Universal Hobbies JFK Mall ST PAUL PH 6928683 Ph 803 235-8320 or 242-4229 WINNIPEG MANITOBA 3512 W Victory Bhrd 141 South State Road 7 WESTBROOK Mac's Models Inc HIGH POINT MYRTLE BEACH Cellar Dweller Hobby. Ltd COVINA POMPANO BEACH Castle s Hobby Center 1326 N Rice Street Berne's Craft A Hobbies. Inc Ed's Hobby Shop 1354 Mam St 2291 English Road Covina Hobby Center Trade N Hobbies Rte 302 597 Bridgton Road PH 612-4896060 Hwy 501 NexttoFanjoy PH 589-2037 140 N Citrus 2159 S E 9th St MARYLAND MISSISSIPPI KING Sign Company WINNIPEG MANITOBA PH 3059431997 PH 331 1910 WALDORF BILOXI K m g R C TENNESSEE Gooch's Hobbies EL CAJON SARASOTA Doug's Hobby Shop Chuck's Hobbies Old Hwy 52 KNOXVILLE 646 Portage Ave Mike’s Model Shop H A H Hobby Sales Waldorf Shopper’s World 502 Edgewater Gulf Dr C-3 PH 983 3969 Tennessee Model Hobbies ST JOHN S. NFID 229 East Mam WINSTON SALEM 4121 S Tamiami MASSACHUSETTS PH 601 3888346 Rt 62 Oak Ridge Hwy Sofway Capitol Hobby Centre. Ltd FRESNO SOUTH DAYTONA AMES8URY OXFORD The Hobby Corner PH 615482 2900 6 Freshwater Road Fresno Hobby 4 Crafts Ace Hobbies Goodwin's Photo A Hobby Creative Sources 136Ό Oakwood Drive NASHVILLE NORTH DAKOTA DUNDAS, ONTARIO 3026 N Cedar Ave 2133 So Ridgwood Ave 30 Mam Street 1010 Jackson Ave The Toy Mart Skyer aft Hobbies Inc FULLERTON PH 904 761-9780 BOSTON MISSOURI GRAND FORKS 113 Graytynn Drive 139 York Road California Model Supply TAMPA Eric Fuchs Hobbies GRANDVIEW McGitlms Hobbies Unlimited PH 615883 1648 SCARBOROUGH. ONTARIO 1056 South Broohhurst 1228 9th Ave S Farmers Sundries A Hobbies 28 Fremont Street Fk> Mow Co TEXAS Toronto R/C Hobby HAWTHORNE 4939 E Broadway BURLINGTON 700 Blue Ridge Ext PH 701 772 5311 ARLINGTON 1869 Lawrence Ave E PH 813-248-3314 MINOT Chuck’s Model Shop Eric Fuchs Hobbies LEE S SUMMIT The Hobby Hub PH 416-755 1766 Aeroplane Factory HobbyShop 14106 Hawthorne Blvd GEORGIA Burlington Mall Blue Hilles Bike A Hike. Inc 903 A Pioneer Parkway West WllLOWDAlE. ONTARIO Mmof Inti Airport LAKEWOOD ALBANY CHICOPEE 229 S Mam AUSTIN Keith’s Hobby Shop Hobby Warehouse Lowed’s J A J Hobbies ST CHARLES WIlllSTON J 4 J Hobbies Tr^County Hobbies 5205 Yonge St 4128 South Street 1601 N SUppey Blvd 133 Frontenec Street Mark Twain Hobby A Craft 610 Kenmston Dr PH 2224721 LAKEWOOD 103 22nd St West PH 912888-2095 PH 413-592 1472 1355 S 5th CORPUS CHRIST I ANCIENNE LORETTE. Jet Hangar Hobbes MARIETTA EAST LONGMEADOW St Charles Shopping Center OHIO Leisure Tim· Hobbies BEAVEROAM QUEBEC 12554 Central» Road Complete Model Supply Bill's Hobby Supplies NEVADA 1326 Airline Passe-Temps Phoenix West side Shopping Center Buckeye Hobby Shop PH 213-8607612 600 N Mam Street LAS VEGAS DENTON 1459 Notre Dame LIVERMORE 806 Sandtown Road PH 413-736-7711 7940 Lugab.ll Road Yellowturd Hobbies JJ' j Hobby Den PH 4188724113 Hobby Haven BERLIN HEIGHTS ROSWELL FITCHBURG 4972 S Maryland Parkway«! 117 W H«kor> ARVIDA QUEBEC 1756 First Street Tommy’s Hobbies McMannus Hobbies A Novel Daniel's Hobbies EL PASO RENO LeModele Redu.t Enr PH 415-443 5828 1270 Alpharetta St 633 Mem St 36 Center Street Hal s Hobby Shop 118 Mathias CP 341 LOMITA Brannon Square High Sierra Models CLEVELAND FRAMINGHAM No 57 Sunrise Center PH 418548-2136 SMYRNA 953 West Moo na Lane The Hobby House. Inc The Flying Machine Model Cl Fisher R C PH 915-755-1914 HAUTE RIVE QUEBEC 2441 S Nar bonne Ave Hobby Junction 17 Salmi Road PH 702825 9098 800 Huron Road FORT WORTH MT VIFW NEW HAMPSHIRE Le Centre Du M odest· 3260 South Cobb Dove PEABODY CLEVELAND Mott s Hobby Shop Allard 1223 lestrat KEENE National Hobby. Inc 7241 Grapevine Highway San Antonio Hobby Shop VALDOSTA Eric Fuchs Hobbies MONTREAL. QUEBEC Leisure Time Hobbies 5238 Ridge Road Sears Shopping Center Jim's Hobby Shop Northshore Shopping Center PH 817 2810921 Can Air Hobbies PH 415941 1278 Northside Plaza WORCESTER 322 West Street FINDLAY HOUSTON LITTLETON Jinx Model Supplies 5850 Goum Blvd Ouest NORTHRIDGE PH 912-244-6991 Ray's R/C Specialties Clear Lake Models PH 514 332 3565 Hobby Land 721 Rockwell Ave Smith Brothers HAWAII 12 Sherman St 117 Cam.no S Shopping Ctr SASKATOON SASKATCH 8941 Reseda Blvd HONOLULU PH 757 5883 101 Union Street LAKEWOOD PH 7134888315 NEWINGTON Collms Aero Craft SACRAMENTO Hobbietat WRENTHAM Wrngs Hobby Shop Inc HURST 238 First Ave North Graphic Hobby House 1423 Tenth Avenue B's Tire A RiC Hobbies Eric Fuchs Hobbies 17112 Detroit Ave Roy's Hobby Shop Fox Run Mall PH 221 5383 PH 6524775 2610 Marconi Ave ILLINOIS 383 Burnt Swamp Road 1309 Norwood YORKTON SASKATCH NEW JERSEY LANCASTER SAN BERNARDINO BELLVILLE PH 617 3848237 SAN ANTONIO Radio Control Hobbies Harper s Hobby Shop MICHIGAN EDISON Slater 's Inc Clayton Hobbies West Side Hobby 39 Betts Ave 222 No G SI 2629 West Ma.n Street ANN ARBOR C J RC SUPPLY Plaza Shopping Center 5707 E Mobud SAN FRANCISCO CHICAGO Rider's Hobby Shop 250 Plamfiekl Ave 1141 N Memorial Drive UTAH Franciscan Hobbies Stanton Hobby Shop 115 W Liberty PH (201) 9858660 LIMA OREM AUSTRALIA 1935 Ocean Avenue 4734 N Milwaukee Ave BATTLE CREEK MARLTON Callahan Hobbies Miniature Aircraft Prod SYDNEY. N S W SAN JOSE CRYSTAL LAKE Hobby House Hi Ffy Hobbies 1229 E Elm St 811 W 400 N Pyrmont 2009 Chuck Sheldon s Hobby Shop Frank’s Barber Toy A Hobbies 1035 W Terntonal Rd Route 70 A Cropwe« Road MANSFIELD SALT LAKE CITY Bunmex 3157 Alum Rock 111-113 North Mam Street PH 964-9105 PH 6099838060 Top Flite Douglas Models 137 Pyrmont Street SANTA BARBARA PH 815-4590247 CADILLAC POMPTON PLAINS 15 N Mam PO Box 9276 PH (02)6920694 Atkins Hobbies GLENVIEW The Flight Center Hobby Hut MIDOLETOWN 2065 E 33rd South BRISBANE. QUEENSLAND 14 W Anapamu Street KJipper’s Toys A Hobbies 916 S Mitchell 567 Route 23 G Ä G Hobby Shop VERMONT Underwood 4119 PH 805 963-3404 1314 Waukegan Road CLAWSON PH 201835-2077 1720 Central Ave SW ANTON The Hobby Warehouse SANTA MONICA PH 312-724 2040 Nick's Pet A Hobby RAMSEY PROSPECT The Hobby Shop X Kingston Road Even's Model Shop McHENRY 1139 W 14 Mile Road Hi Way Hobby House Lighthouse Hobby Supply Co. RFD 1 Rt 7 ENGLAND 1636 Ocean Park Bhrd The Hobby Hangar COLDWATER Route 17 507 E North Street PH 802 524 2715 NORFOLK. NR17 IDG PH 213-452 2720 5515 No Wilmot Road Hobby Heaven RANDOLPH TOLEDO VIRGINIA Pegasus Models. Ltd SANTA ROSA PH 312-497 3103 7 S Monroe Street Carl's Hobby Center The Hobby Stop ANNANDALE Cast on. Attleborough Toy & Model MURPHYSBORO PH: 517 278 5894 506 Route 10 4907 Summit Street Model Masters. Inc NEW ZEALAND 711 Coddmgtown Mall RJ Hobby A Elec Center DEARBORN PH 201 366-4300 WAPAKONETA 6920 Braddocfc Rd INVERCARSIll COLORADO 1508 Walnut Street Joe’s Hobby Center RED BANK Dad's Toy Shop RICHMONO Mode· Shop AURORA PH 618087 1981 7845 Wyoming Ave Hobbymasters. Inc 129 E Auglaize St The Hobby Center 55 Arcade Dee St. Tom Thumb Hobby Center OAKLAWN PH 313-933-6567 62 White Street YOUNGSTOWN 1709 Willow Lawn Dr PH 89439 10718 E Colfax Pat's Hobbies A Crafts EAST DETROIT WALLINGTON Boardman Hobby Center WASHINGTON VENEZUELA PH 303361-6159 5730 W 95th Street Joe's Hobby Center Bednarz Servicenter 6820 Market Street BELLEVUE CARACAS 107OA COLORADO SPRINGS PH 424-6131 17900 E 10 Mile R/C Hobby Supples ZANESVILLE R/C Model Shop Hobby W ork! C A (D«st > Custom Hobbies PH 313-733-8294 356 Main Ave Thompson Radio Supplies 14020 N E. 21st St Apartado Postal 75054 2813 E Platte Ave 110S 6fh Street PH 747 9914 PH (02)34 3302

DEALERS: Write For Details On How Your Name Can Appear In This Column able to the average youngster whose parents were not "in to " the hobby. You dreamed about owning the Brown, but you could still build, and fly, and trim, and crash, and overcome failures, and learn basic modeling and aerodynamics, and be totally ecstatic over your first thermal ride. Today’s youngster is in the same boat. The "inexpensive” R/C trainer (?) still costs about 100 times as much as the few stick-and-tissue kits available . . . and is still unattainable to the average young­ ster whose parents don’t understand the value of the hobby. The big difference between then and now, however, is that the equivalent of the Megow or Comet model is almost extinct, and instead of being available as they were in various MB's Editor/Publisher congratulates Hanno department stores, hardware stores, Prettner of Austria on yet another major tri­ drug stores, five-and-tens, and local umph in radio controlled aerobatics, the 1983 hobby shops that any kid and his bike FAI World Championships in Pensacola, Flor­ f r o m ida. Report begins on page 11. could get to, they are now only in thinly scattered hobby shops in larger towns "rock-on-a-string." Bill and cities, mostly out of bicycle range. No, these were no help. It’s still the What it kinda boils down to is that good old stick-n-tissue model that pro­ Northrop'* years ago, a youngster could discover vides the important beginning. Even modeling on his own, and could afford AMA shows signs of recognizing this workbench to get his feet wet, no matter what his with the Cub, but there’s no follow-up. financial level. If only ten percent out of You can’t win a fight by throwing a single a million kids exposed to the hobby left jab and then sitting back to wait for • I wonder how many people share my caught the bug, you had 100,000 model­ the decision. The Cub or Dart should be concern for the future of this hobby of ers! Today, in most cases, it takes a followed up with ‘‘stepping stone” building and flying model aircraft? No, modeling adult to lead a youngster into designs, then local and regional contests this isn’t going to be another lecture on the hobby. If you assume, based on . . . and then the Sunday Punch . . . the continual disappearance of retail AMA’s 80,000 membership, that there industry sponsored regional winners hobby supply outlets and the short­ are double that number of adults in the going to an "AM A Junior Nats" with sighted business activities of the mail­ hobby in the U.S.A., and their success about ten beginner-type categories, order discount companies, although rate, if they even try, to get their young­ with scholarship and other education- both of these are primary factors affect­ sters into the hobby is a better than ten assist prizes. ing the future of the hobby. percent. You’re looking at a paltry 16,000 It doesn’t take a lot of moneyspenton The focus of my concern this month is newcomers. an exotic and complicated model air­ on the emphasis given by the model air- What can be done about it? There's no craft to really enjoy this hobby . . . if plane hobby industry on the high- easy answer. We live at a continually you’re a real modeler. Here’s a good ticketed facets of the hobby, most of accelerating speed. There are still 24 example of stopping to smell the roses. which are connected with anything re­ hours in a day, but we jam much more Last weekend I went to Mile Square lating to radio control. Don’t get me into an active day than ever before. Park to look in on the Annual Flying wrong, I'm as much of a radio control There are less and less people taking less Wing contest. As I drove onto the flying enthusiast as anyone else in the R/C and less time to stop and smell the roses. area, I noted that there was a longer hobby, having been designing, building, The instant result plastic shelf model has string of cars at the free flight strip than flying . . . and crashing R/C models for taken the place of the "solid” model, at the R/C strip, so decided to go there the past 28 years. But, like the majority of which you carved, and shaped, and first. Among the many familiar faces was today’s permanent modelers in R/C (as sanded from blocks and sheets of wood. Bill Hannan, our Hannan’s Hangar col­ compared to the buy-em, crash-em, in- Many of us have heard these words, "I umnist. and-out faddists), I’ve had a solid back­ tried modeling once, but didn't like it.” Bill had just completed a modified ground, and continual interest in the Next time you hear it, ask a few ques­ version of his "Stringless Wonder", a basic, and comparatively low-cost facets tions. Nine times out of ten, I end up contrivance consisting of less than 20 of the hobby, i.e., rubber and gas sport discovering another victim of the great­ sticks of wood on a motor stick, shaped free flight, the physical and technical est set-back to model aircrafting ever like a kite, and powered by one loop of challenge of hand launch gliders, the created, the reed valve .049 powered, rubber turning a Flight Streek plastic dream-like slow motion of indoor, the brightly colored plastic "Pukie Ukie” . prop. Oh yes, the model was covered maneuver - it - yourself - without - radio Ask any experienced control line mod­ with tissue. simplicity of backyard control line... eler to tell you how these things "flew” . Standing with me, and kibitzing on My concern is that the industry is not Imagine how many hundreds of thou­ the relative merit of Bill’s model, was looking ahead with respect to the future sands of uninitiated potential modelers Jack Elem, a fine modeler of many years, of the hobby, not seeking to engulf new received one of these things as their first and one of the most accomplished generations of youngsters. . . the indus­ "model airplane". If a few of them were "dirty old men” I have ever known. As try’s future customers . . . into the per­ lucky enough, without the help of Bill’s "MSW” was totally untested, he manent hobby of model aircrafting. someone who knew how, to get the drafted Jack to hold on while he short- Some say that the industry is gearing engine started and running, how could wound the rubber for the first flight. The toward the youngsters, with easy-to- they possibly get it to fly when even an power portion of the hop was fine, but build, easy-to-fly, "inexpensive” radio expert had a devil of a time doing it? the glide was only good if you were con­ control trainers. BULL! Back in the 30's, a There were a few models that were cerned about its flying away. Brown Jr. at $21, was worth roughly 100 worthwhile, such as the Cox PT-19, At this point, a three-man committee times as much as a Megow or Comet which was rubber-banded together and was formed, and we met after each test stick-and-tissue model airplane kit could take a helluva beating, but the “ Lil and therefore the Brown was unattain­ Stinker” Pitts was a totally unstable Continued on page 100

6 MODEL BUILDER OVER THE COUNTER A H material published in "Over the Counter" is quoted or paraphrased from press releases, furnished by the manufacturers and/or their advertising agencies, unless otherwise speci­ fied. The review and/or description of any product by R/CMB does not constitute an endorsement of that product, nor any assur­ ance as to its safety or performance by R/CMB. • You've asked for it .. . now it’s here . .. the new .60-sized King Kobra from Sig Manufacturing Co., Inc., Monte­ zuma, IA 50171. For years modelers have been asking Sig for a .60-sized Kougar, now Sig has done this idea one better and incorporated the newer lines of the popular little Kobra with all the great flying capabilities of the Kougar. With a spectacular roll rate, dazzling vertical climb, and forgiving low speed handling performance, this sleek new model can make an average Sunday flier look like an expert. King Kobra The kit features a precut from core SIG Mfg. Co., Inc. new for .60 size engines. wing with built-in washout for excellent You can see by the foregoing that the fuselage and wing stringer detailing has flying characteristics, handy printed kit is rather complete. We feel that you been paintstakingly duplicated. A spe­ fuselage sides . . . build directly on the will be pleasantly surprised to hear that cially designed retract system, complete wood, formed plastic fuselage top, jet this 58-inch span, 700 sq. in. area model with sequencing doors, retractable tail style canopy with molded framing, is only $79.95. See the Sig ad in this issue wheel, and numerous scale details, is molded plastic cowling, sheet balsa wing for a dealer near you, or order direct, the also available. covering, sheet balsa fin, built-up airfoil above address is all you need! Other features include Byron Ori­ stabilizer, rugged, ready-bent landing ★ ★ ★ ginals’ exclusive Plug-In Wings and gear, die-cut plywood parts, 32-page Bryon Originals, P.O. Box 279, Ida Aileron Linkage System. In a matter of photo-instruction book with step-by- Grove, IA 51445, has announced the seconds, a 77-inch wing span becomes step instructions, fiberglass wing tape, release of its latest kit . . . the classic 17-1/2 inches without ever having to and a full-size plan. Staggerwing Beech G-175. Like the rest disconnect the pneumatics or delicate The hardware package includes of the Byron line, this 1/5-scale biplane servo linkages. A removable firewall molded control hinges, nylon control is designed and packaged in the tradi­ allows easy access to the entire fuselage horns, nylon nose gear bearing, nylon tional "complete kit concept." State-of- interior, including all radio gear, link­ nose gear steering arm, RC links, heavy- the-art assembly concepts and materials ages, fuel systems, etc. duty aluminum motor mounts, wire have reduced considerably the amount Like the full-scale version, this Stag­ aileron horns, and nylon screws for bolt- of time and money normally spent in gerwing performs exceptionally well at on wing attachment. building such a model. All items, except both ends of the flight envelope. With a engine, radio, glue, and final covering standard Quadra 35 or similar engine, (paint or Econokote) are included in the the G-17 will land gently and predict­ package. ably like a Telemaster, yet is fast and fully Concern for scale realism is evident aerobatic enough to satisfy the seasoned throughout the kit. A highly detailed pattern flyer. fiberglass fuselage plus wings and con­ For additional information, or to place trol surfaces provide the kind of scale an order, contact Byron Originals at the appointments that even the scale purists above address or call (712) 364-3165. Associated Jaguar body for 1/12 R/C cars. will appreciate. For example, even the ★ ★ ★

Byron Originals new Staggerwing Beech G-17S in 1/5-scala New Series 150 SR battery packs weigh 1.25 oz.. 175 mah capacity.

FEBRUARY 1984 7 Much improved Monocoupe 90A kit from Ikon N'wst. New Porterfield Flyabout designed for Enya .90 4-cycle. Ikon N'wst. Like the rest of the Micafilm line, Pre- authority. It pulls the 100-inch Gemini Primed is half the weight of other iron- M.T.S. model shown up to about 700 feet ons, yet seven times the tear strength of in one minute and gives four to five such any other film. And they all have the climbs on one 15-minute charge .. . lowest heat requirements: less than perfect for 100 to 120-inch span sail­ 240°F. for attachment. Which means it planes. This winding can also be used in can go on sheeted foam surfaces with­ scale projects where the thrust of a out any danger of disturbing the foam. larger prop may be needed. And to go along with the new Chal­ Ikon N'wst Sweet Bee sport plane. In addition, all Micafilm coverings are 100% sagproof! Models covered 1-1/2 lenger 40 and its 14-cell battery pack. Coverite announces a breakthrough years ago are still as taut as the day they Astro Flight announces its new Rapid for all model painters. They have devel­ were ironed on. With the addition of Charger with dual output. It contains oped a revolutionary iron-on film that new Pre-Primed, the Micafilm line now two charging circuits so it can charge actually comes with its own factory encompasses four translucents (red, TWO Ni-Cd batteries at the same time. prime coat. It’s called PRE-PRIMED blue, yellow and newly released orange), The charger can charge single batteries MICAFILM. The unique advantage of pearly white, and realistic aluminum. of from four to seven cells and twin this re-inforcedd film is that now you Micafilm comes in two sizes: 29 in. x batteries from 10 to 14 cells. (When two can achieve a smooth surfaced finish 65 in. and 29 in. x 16.4 ft. Available from without any filling, sanding or base your favorite dealer. coats. All that is required is that you iron ★ ★ ★ it down, then apply only one or two Sometimes, by virtue of significant coats of paint. The result is a quick, easy improvements and/or major changes, paint job equivalent to one that used to an existing product can be considered require hours of preparation before the new. Such is the case with two of Astro color coats could be applied. Flight’s latest offerings in the world of Compared to conventional painted electric powered R/C aircraft. Intro­ finishes, a Pre-Primed Micafilm finish is ducing the new (by virtue of improve­ less than 1/3rd the weight. That includes ments) Astro Challenger 40 cobalt glasscloth, dacron, nylon, silk, tissue or motor, and the new (by virtue of major silkspan. changes) Astro Rapid Charger. Pre-Primed Micafilm is recom­ The new high torque wind Astro mended for the majority of aircraft Challenger 40 cobalt motor swings a including pattern, scale, sport, glider, 13-7 folding prop on direct drive and pylon, U/C, combat and trainers. In uses a 14-cell battery pack. Now the flier addition, as Pre-Primed has a flat gray who wants to fly a larger sailplane on color, it is perfect for various military direct drive, wants the aerodynamic aircraft (such as the Grumman Hellcat efficiency of a large folding prop, and pictured). Used in this way, out-of-the wants to charge his batteries from his box, it requires no protective coating automobile in 15 minutes, can FfAVE IT whatsoever, and is totally fuel and ALL! The new 10-turn wind for the Astro weather resistant . . . more so than Challenger 40 cobalt motor will swing almost any other surface! the 13-7 Geist folding prop with Aprons, T-shirts, and caps from Peck-Polymer.

Giant Standoff Scale Taube from Nick Ziroli Models. Tilt-Table Disc Sander from Jarmac, Inc.

8 MODEL BUILDER batteries are charged at the same time, New Lexan replacement bodies from MRP for the Outlaw Sprinter and Ford XLT150 truck. they must have the same size and num­ their sail planes with extraordinary power An endless variety of output speeds can ber of cells, such as two six-cell packs of will be glad to know that Davey Systems be obtained by trying different com­ 1200 mah cells.) The charger also fea­ Corporation, One Wood Lane, Mal­ binations of pulleys on the motor and tures automatic trickle charge, and vern, PA 19355, (215) 644-0692. has drum shafts to find the one best suited to voltage jacks on the front panel which recently released its newest product in your requirements. allow the user to monitor battery voltage its line of quality, R/C sailplane launch­ The new Pow’rzoom winch features: and to peak his batteries for maximum ing and retrieving systems: the Pow’r- 160-pound braided nylon winch line; a performance. An inexpensive volt­ zoom winch. The Pow’rzoom is also welded steel take-up spool with a three- meter, such as the Radio Shack $50.00 ideally suited for contest or sport flying, inch hub; solenoid protected foot model shown, can be used. Now you can especially if crosswind or downwind switch operation; anti-backlash, anti­ build larger planes with 15 and 25-size launching is required. kiting brake with easy diengage; ball motors and still charge the power pack The Pow’rzoom achieves its high bearing line swivel; large (18 in.), red from your auto in 15 minutes. speed and powerful torque from a and white nylon parachute; 24-inch Order these and other Astro products high turnaround with ball bearing motor especially engineered and manu­ from your local dealer, or order direct. pulley; four-gauge battery cables with Astro Flight, Inc., 13311 Beach Ave., factured for DSC for this specific appli­ heavy duty clips for quick release; Venice, CA 90291. cation. The Pow’rzoom features heavy sealed ball bearing front plate on the ★ ★ ★ duty, welded and painted steel frame motor; and much more! As options, R/C sailplane fliers who are into F3B, construction with an adjustable motor DSC offers a four-inch hub take-up scale, or cross country soaring and who mount plate to insure that proper drive spool (add $20.00), and 2000 feet of 200- are looking for a winch that will launch tension is maintained on the belt drive. pound line (add $5.00). For those home-brew winch makers, or those who just wish they had a new or different take-up spool on their existing winch, DSC offers a new, competition class winch drum for launching F3B, scale, or cross country gliders. The new drum features nine gauge steel, welded and painted construction, with two collars and set screws to anchor the drum to the shaft. The drum has a 5/8- inch bore for use with long-shaft Ford starter motors, and a four-inch diameter hub with four-inch spacing between the eight-inch diameter end plates. The price is $50.00 plus $3.00 shipping, or it is available as an option when ordering the new Pow'rzoom winch. ★ ★ ★ R/C car racers will take note of the beautiful, sleek, new Associated 1/12- Astro Challenger 40 (cobalt) with new wind. Tatone engine mount for O.S. Max 120. scale jaguar body . . . it’s not only a

Astro Flight Rapid Charger for dual output, up to 14 cells. Tatone universal m uffler for .60 to 1.3 engines. Fits tight spaces.

FEBRUARY 1984 9 New Pow/rzoom winch for R/C soaring. Power to spare from DSC. Peck-Polymers building boards for all modelers, three sizes. 1.25 ounces. If you need more capacity, the new four-cycle Enya .90 engine. Now there’s also a new 300 Series pack that it’s here. Ikon feels that it has killed two has a capacity of 325 mah but weighs birds with one stone so to speak. The only 2ounces. Both packs are $19.95 plus Porterfield Flyaboul has never before $3 for the connector of your choice. been kitted. It is such a pretty little If your transmitter needs a new pack plane! Ikon designed it to have an 80- or more capacity, SR can solve the inch wing span and weigh only ten problem. SR makes replacement packs pounds. You don’t need heavy duty gear for all R/C transmitters including Futaba for this little cutie. G series, J series, and Circus JR trans­ The kit has formed cowling (the ring mitters. For Kraft transmitters, SR has a cowl is formed also). All curved parts are new 650 mah, 600 Series pack that will go hand cut. The hardware package is right into the transmitter's battery box. complete, and the gear is pre-bent. The If electric powered planes and cars are replica Flyabout is designed to 2.5 inches your thing, SR’s new 900 and 1200 Series to the foot scale. Cruising speed is Davey Systems replacement winch drums. EP Max Packs are what you’ve been achieved at 1/4 throttle, and the landing potential Concours winner, it’s also a looking for. Lower internal resistance is very slow and realistic. and higher capacity make these new super handling body on thetrack. You’ll Ikon N'wst's popular Monocoupe 90A packs the ones to beat. like this one! Ask for part number 3169, quarter-scale kit has been revised and The many magazine reviewers, record the price is $11.00. the drawings improved, along with Also, Associated has a new type of rear setters, contest winners, and nationally some production changes. The kit is racing rubber that gives more rear recognized groups like the U.S. Soaring much improved and results in probably traction than ever before available. This Team who use SR battery packs exclu­ the best value in the BIG Bird field. rubber is available for 1/12 and 1/8- sively, are proof of the superior quality Also available is a photo package for scales. The rubber is marked as follows: of SR packs. Top Flite is even recom­ the plane which will aid the builder in red dot: super high traction, super soft, mending that they be used in their new achieving a really scale plane. For those ideal for dusty or slippery tracks, wears Antares ultra high performance sail­ who just want the best scale-like aero­ fast; yellow dot: very good traction, plane. batic plane on the market, then build medium soft, use on average tracks, You can now use your Visa or Master the Monocoupe 90A straight from the medium wear; green dot: good traction Card to order from SR Batteries. Call SR kit. and medium firm, use on high traction at (516) 286-0079 or write them at 29 New from Ikon N’Wst is the superla­ tracks or long races, slow wearing. Maple Avenue, Bellport, New York tive Sweet Bee. As the Sweet Bee weighs Write to Associated for prices and free 11713. Include a business size, self five pounds, has a 55-inch span, and is catalogs: Associated Electrics, 1928 E. addressed envelope and 37 cents post­ .540 powered, you know right now this is Edinger, Santa Ana, CA 92705. age for full details on the entire SR line. a performer. On takeoff, just go straight ★ ★ ★ ★ ★ ★ up, on landing, fly really slowly. The SR Batteries has been very busy com­ Ikon N’wst has been very busy this Sweet bee has a fully symmetrical wing ing up with new ideas for the serious season improving and adding to its line with the well-known N5 airfoil, giving R/C hobbyist. of excellent scale and non-scale R/C great maneuverability and slow speed For the small plane flier, there’s a new aircraft. for landings. 150 Series pack (pictured), that has a Modelers have been asking when capacity of 175 mah and weighs less than Ikon N’wst would create an airplane for Continued on page 86

Lightweight wheels in 3/4, 7/8, and one-inch sizes from Peck-Poly. Coverite Pre-Primed Micafilm for m ilitary scale and painting colors.

10 MODEL BUILDER The German (3rd), American (1ft), and Japanese (2nd) FAI teams Dave Brown (3rd), Hanno Prettner (1st) shaking hands with Contest on the victory platforms during awards ceremony in Pensacola, FL. Director Ron Chidgey. and Bertram Lossen (2nd), individual winners 1983 R/C AEROBATIC WORLD CHAMPIONSHIPS Pensacola, Florida By BILL NORTHROP . . . Model Builder's Editor/Publisher covers the action at the 1983 WCs. Photos by Anita and Bill Northrop

• Hanno Prettner, of Austria, and the U.S. Team have repeated their top rating performances to capture once again the individual and team first place positions respectively, at the 1983 World Champi­ onships for R/C Aerobatics in Pensacola, Florida, October 10 to 15. This made it the third time for Hanno, who also won in 1977 and 1981, and the ninth time for the U.S.A. team, which won in 1963, 1965, 1967, 1971, and then every W/C year from 1975 to the present. Following Hanno in the individual placings were: Bertram Lossen (W. Germany), Dave Brown (U.S.A.), Ivan Kristensen (Canada), Wolfgang Matt (Liechtenstein), Yoichiro Akiba (Japan), and Steve Helms (U.S.A.). These were the positions of the first seven, after a two-round flyoff of the top ten percent Hanno and constant companion, helper, father (70 fliers competed). Originally, after the U.S. team (I to r) Steve Helms. M n gr D ick Hans, with Hanno's new radical "Calypso” . four rounds of regular competition, the Penrod. Tony Frackowiak, and Dave Brown.

The radically uncomplicated Calypso. H anno "D o I hear a 106?" Engine noise m onitor boss Tony Frackowiak, U.S.A., finished eighth, just hopes to s ta rt a K. I.S.S. trend. Ed Izzo listens, with helper Ed Keck. missing the flyoff. Put team in first.

F E B R U A R Y 1984 11 Jan Van Beek, Holland, one year ahead with Saito 120 four-cycle, turning 15x10 Zinger cut Underside of Van Beek model, showing Cessna- "turnaround" ship, placed 44th. to 14 and thinned, 15% castro, 5% nitro. type gear, exhaust in plug-in wing screws.

Jung Bok An, Korea, with helpers. Competed in Acapulco, 1981. Placed 65th this year. Jorge Macedo, Brazil, placed 61st. He's 33, data processing manager for COFAP, Brazil.

Kevin Hayne, Mngr. John Brink, and Ivan Olivier, of South Africa. Ivan placed 34th. placings were: Prettner,Lossen,Kristen­ sen, Brown, Helms, Matt and Akiba. Continuing with the top 20, it was Tony Frackowiak of the U.S.A. in eighth, fol­ lowed by Giichi Naruke (Japan), Tsugu- taka Yoshioka (Japan), Giuseppe Berto- lozzi (Italy), Pascal Ardonceau (France), Pascal Malfait (France), Franz Mayr (W. Germany), Greg Marsden (Canada), Werner Schweiker (W. Germany), Benito Bertolani (Italy), Gerard Werion (Bel­ Jan Van Vliet, Holland, placed 43rd. His coun­ Angel Maldonado, of Argentina, 58th. South gium), Brian Brotherton (Great Britain), try will be next w/c host, in 1985. American Go-Kart champ 1974, private pilot. and Ken Binks (Great Britain). There were 70 contestants entered and flying 28 countries represented in all. this year, with a large turnout from the Looking at it individually again, South American countries. Bertram Lossen has once more demon­ In the team competition, the U.S. was strated that he's the hottest prospect to followed by Japan, West Germany, come along in recent years. At his first Canada, Austria, Italy, France, Belgium, World Champs in Acapulco ’81, he Great Britain, and Switzerland, to take it through the first ten places. There were

Second place winner Bertram Lossen, West Norbert Matt, also known as Wolfgang's Luxembourg's Lucien Gerard, placed 47th. Germany, not far behind Hanno Prettner. brother, from Liechtenstein, placed 27th. At 23, he has been National Champ four times.

12 MODEL BUILDER Tore Jemtegaard, from Norway, 40th. Was Norwegian C/L Aerobatics Colin Taylor, Australia, placed 37th. Also Australian record holder in champ in 1980, and R/C Champ in 1981. A TV technician. Cross-Country distance.

If our notes are correct, it's Mario Rodrigues, Salvatore Pompei, Brazil, placed 66. Brazilian Phil Stevens. Great Britain, 30th, assisted by of Santiago, Chile, 54th. Champ, So. Am. Vice Champ.Sao Paulo Champ. Brian Brotherton, who placed 19th.

Vibration mounting and intake silencer on Terje Eltvik, of Norway, placed 45th. Note Italy's Ruggero Pasqualini, placed 21. An auto Tom Prossers O.S., cut down on dBs. single retract wheel and wing skids. dealer for BMW Bologna, private pilot.

Hub. Dekkers, Holland, 42nd. Team members Ricardo Gomez, Venezuela, placed 46th. Only Mike Lynch, the lone team member from New placed 42, 43, 44. That's sticking together! 19, he won Venezuelan Champs this year. Zealand, Placed 62nd. N.Z. Champion.

FEBRUARY 1984 13 Giichi Naruke, Japan, 9th, checks controls on his Cosmos. Helper and Adolf Panz, Austria, waits in the ready box before flying. He placed Team Mngr Kentaro lioka stand by. Natl. Champ in '82 & '83. 23rd, helping team to place 5th. He’s a master electrician.

Wolfgang Matt, Liechtenstein, placed 6th in Alexandres DeGotte, of Belgium, placed 25 in W ouldn't be a World Champs without Jim qualifying and 5th in the flyoff. spite of broken arm from motorcycle accident. Clarke, Ireland and his derby. Placed 64th.

Real sharp looking model by Graham Stowell, Pascal Malfait, Prance, placed 13th, hands The symbol of fame, signing autographs. It's Papua, New Guinea, who placed 28th. maneuver schedule to Mngr. Guy Brouquieres. Hanno, and he's getting used to it!

Alberto Florez, Peru, placed 55th. Helper is team manager Benjamin Castaneda, Mexico, placed 60th. A consulting engineer, he Tadashi Komoy. has competed in the U.S. and Switzerland.

14 MODEL BUILDER MB's General Manager, Anita Northrop, with the Benito Bertolanis Tlie winners and the workers! The N.W. Florida R/C Modelers, Pensa­ and the Giuseppe Bertolozzis. Benito 17th, Giuseppe 11th. cola Aeromodelers, R/C Modelers of Pensacola, and Eglin Aeromodelers.

Sally and Dave during the flyoff, in which Dave Yoichiro Akiba and "R ocky"of Japan finidied Canada's Ivan Kristensen (4th), Manager Larry moved up from fourth to third. 7th, then moved up to 6th in the flyoff. Barrett, and Greg Marsden (15th).

Steve Helms, U.S.A., placed 7th after flyoff, helped put team in first Paul Behm, Luxembourg, 41st, flew beautiful exhibition to music, place. Helper is his dad, pylon racing specialist Gale Helms. a la ice skating. finished fourth, after putting in the highest and same flight score in both rounds of the flyoff (yes, higher than Prettner, but his backup score in the regular competition prevented a higher position). He was the West German Champion in 1981 and 1982, and al­ though serving his required one-year time in the army, was able to maintain his skill level for this year’s World Champs. Now beginning college as a medical student, we’re not sure how much free time he will have to sharpen Juan Hidalgo, Venezuela, 53rd, civil engineer his flying (if it’s really possible to make it with Electridad de Caracas. sharper!). already beginning to think in terms of Lossen flies in the typical European the smaller, closer-in maneuvers of the style, with large, far out (no, not “ far coming turnaround pattern. It could out” in the terms of John Denver!) have accounted for the small difference maneuvers that may be just a little too in scores between Prettner and Lossen large and too far away from the judges, . . . 2858 to 2804 at the end of four A fitting climax to the championships, winner but man, are they smooth, symmetrical, Hanno Prettner makes last official flight/ and consistent! Perhaps the judges are Continued on page 68 landing.

FEBRUARY 1984 15

FE B R U A R Y 1984 FULL-SIZE PLANS AVAILABLE - SEE PAGE 96 1983 KITCHNER/ WAT By CLIFF TACIE . . . Every year the Flying Dutchmen Radio Con­ trol Club puts on a scale rally in the twin cities of Kitchner and Waterloo in the Canadian pro­ vince of Ontario. Because this gathering of scale modelers is not a contest, many scale models are seen here that are not seen any­ where else. A turnout of more than 136 models is proof of this rally's popularity.

• Tradition. Habit. Addiction. Call it what you like, I plead guilty. My model­ ing year revolves around certain dates and events which I annually look for­ A fine example of the quality craftsmanship regularly displayed by Kitchner's Steve Gray is this ward to, and make an effort to attend. Bellanca WB2. The model is powered by a Quadra. Under Steve's expert guidance, this 20-pound My year starts out in early April at the model is an outstandingly realistic flier. Toledo R/C Exposition, the world’s provides pretty stiff competition in the draws fliers from Michigan, Wisconsin, largest and most well-known display of scale arena. Ohio, New York, and Pennsylvania as radio control models and related R/C What am I leading up to? Autumn. well as from across Canada. hardware. How could anyone involved Autumn in the Midwest means cool, The park features a paved runway in a in modeling not attend Toledo if it was sunny days emblazened with reds, triangular format and lots of closely only an hour and a half away? yellows, and greens. It means relaxed, cropped, smooth grass surrounded by Next comes spring and my annual late comfortable flying in the company of low shrubs and absolutely splendid April trek to the rugged springtime good friends and infrequently seen scenery. This is the kind of field every beauty of Rough River Dam State Park in acquaintances. It means an opportunity club dreams of having someday. Kentucky and the popular Mint Julep to view in one place over 136 impressive This year’s event was the 14th annual Scale Meet. This is my first escape from examples of scale model aircraft on rally, and as I mentioned earlier, more the white stuff we’re plagued with all display and in the air. than 136 models were in attendance winter long in Michigan, and provides Of course, it means the Kitchner- over Saturday and Sunday. It’s strictly a my family with a mini vacation and me Waterloo Scale Rally,sponsored and run “ come and fly for fun” get-together. with some good stiff competition to by the Flying Dutchmen Radio Control There is no entry fee, and no prizes are whet my appetite for the upcoming Club of Kitchner, Ontario. The “ tradi­ awarded, perhaps that’s why this is the scale year. tional” date of this annual gathering of place where you’ll see some precision Summertime means the Nats, of scale R/C aircraft and modelers is the quality models that you’ll never see course, and provided I have the avail­ second weekend of September, this year campaigned on the competition trail. able time off, and it’s not too distant, it’s it was the 10th and 11th. The site is the Scale models are not a single faction. become a tradition for me. It’s an Kiwanis Park flying field located in the Some of us thrive on competition and opportunity to view all aspects of our Kitchner-Waterloo, Ontario, area just an build our models to garner maximum great hobby/sport, and again, usually hour or so from London or Toronto, and static points within the rules. Some of us

ABOVE: The wing tank of the Moth is constructed of aluminum printing plate which has been corrugated in a simple jig. World championship quality is obvious.

LEFT: With its wings folded back, as per the full-size deHavilland Moth. M e rritt Zimmerman's Moth model drew the attention of all. Minute detail was outstanding.

18 MODEL BUILDER ERLOO SCALE RALLY

The dummy engine on Steve Gray's Bellanca WB2 conceals a Quadra. Note custom spinner and 6-bolt hub. Pilot looks real in the air! just like to build "sport scale’’ models that look somewhat scale in the air and are fun to fly. Still another faction among This very nice Bristol Scout (Model D) by Jim Zufelt, of Ottawa, is covered with Coverite and us is driven to build the "perfect” finished with butyrate dope. The model weighs 11 pounds, and is powered by a Webra .91. model, exactly duplicating the full-size prototype in every way possible, but not necessarily for competition purposes. These builders get their satisfaction in knowing they’ve done it right, and they don't need a subjective judge telling them they should have done it better! Kitchner is the perfect gathering place for all of these types of modelers. Probably a prime example of the perfectionist type modeler is Merritt Zimmerman, of Cleveland, Ohio. This year, Merritt was there with his de- Havilland DH60 Moth. Not the Tiger Moth nor the Gypsy Moth, this is the original 1925 Moth from which the later models were derived. Not satisfied with just building an absolutely beautiful model featuring prototypically folding

ABOVE: A regular at Kitchner/Waterloo Scale Rallies, Bob Nelitz once more brought his highly detailed J-3 Cub. A t 1/3-scale, and powered by a Quadra, the model has now logged many hours and rallies, but you would never know by looking a t it!

RIGHT: Grahm Ireland's Fokker D-VII featured this beautifully hand crafted dummy en­ gine. The working engine, a Quadra, resides below .

Zimmerman's DH60M of/j features a WORKING, four-cylinder, in-line, four-stroke, gas­ oline powered. Cirrus engine which puts out about 3 hp. Aluminum siding used on fuse.

FEBRUARY 1984 19 The elevator and fuselage (not shown) of the Jungmeister feature zippered inspection flaps with real zippers. Note trim tabs. One of the precision quality models at the Kitchner was Mario Sabi's red and white Bucker Jungmeister. At 13 pounds, the model is powered by a Webra .91, and was built from Svenson plans. Just recently finished, and not yet flown, it looks like Mario hasn't yet made scale prop. wings, corrugated aluminum wing tank, 7AC Champ by Peter Baab. of Hamilton, fuselage panels formed from house Ontario. The model has a 14-foot wing­ siding aluminum and a completely scale span and is powered by a ten horse­ structure, Merritt has even machined his power, air cooled, Chrysler/Southbend own, working, 4.5 cubic inch, three engine which turns a 24-12 prop at 8,000 horse power, four-stroke, four-cylinder, rpm! Somehow, the large size of this gasoline powered, Cirrus engine to pull model isn’t quite so intimidating in the it! The engine swings a 20-14 Zinger form of a Champ. prop, and the model tips the scales at The trend over the past few years at about 22 lbs, eight of which are engine! Kitchner has been toward the larger It’s not unusual to see a project under "giant” models. This hasn’t always been construction at Kitchner. One such ambitious project is a 40% size Aeronca Continued on page 68

The cockpit of the Jungmeister is as fin e ly crafted as the exterior. Note cockpit door and luggage compartment latches. A regular at the Scale Rally is Larry Pierce’s Miles Hawk Major. A Quadra pulls the 23-pound model around convincingly. A bright orange paint job makes it stand out. The Hawk has seen many hours of flying, and was one of the first "giant" models at the Kitchner Scale Rallies.

Probably the largest model of the meet was this 7AC Champ being closely scrutinized here by Cable controls drive the ailerons of Grahm spectators. Under construction by Peter Baab. of Hamilton, Ontario, the model is about 40 Ireland's Fokker D-VII. A combination of percent scale size. The 14-foot span model is powered by a 10 hp Chrysler/Southbend engine. torque tube and cables does the job.

20 MODEL BUILDER for the increased power. The reed valve and glow head were the same as on the Sportsman .15. It is also interesting to note that although the Olympiccylinder and piston were tapered, thereby com­ pounding the problem of a proper fit, it was possible to purchase them separate­ FUEL UNES ly. Tnat will give you a good idea of how JOE KLAUSE closely tolerances were held in those P. O. Box 2699 days. Considering all these things, the Laguna Hilts. CA 92653 price of $12.98 was quite reasonable. As mentioned, the third new 1959Cox • In the April '83 issue of M odel Certainly these features contributed engine was the Space Hopper .049. It’s Builder. I briefly reviewed the Cox TD to the superior performance. However, shown in the last photograph. Again, .15 engines. At that time, I indicated that the twin mirror transfers and enlarged Cox had produced a couple of earlier .15 venturi throat were the major reasons Continued on page 68 engines. The column this month fea­ tures them together with another famous Cox engine. Now, if this all sounds kind of nostalgic, well, it may be, but if you're any kind of an engine buff, The 1959 Cox read on. Sportsman .15 reed Undoubtedly, manufacturers have valve engine. Would you believe dreams for the future and reflect upon a $7 .98 price tag? past great years. Certainly, 1959 was one such year for Cox. In the early spring of that year, Cox introduced the Sports­ man .15, Olympic .15 and Space Hopper .049 engines. As you might surmise, the first of these was intended for the sport flyer. That implies dependable performance and ease of operation. The Sportsman cer­ tainly provided it. Similar to earlier Cox engines, it employed a reed valve induc­ tion system. The venturi was an integral part of the backplate, and the triple jet carburetor was held onto it by a bell shaped venturi nut. As you can see in the first photograph, the extruded crank­ case and cylinder are typical of Cox engines. Another common feature was The Olympic .15 the ball-and-socket attachment of the reed valve engine connecting rod to the piston. The glow featured twin trans­ fer ports, front and head had a spherical combustion cham­ rear ball bearings, ber for a modest compression ratio. and contest perform­ That, combined with a single transfer, ance. assured docile but dependable perfor­ mance. The $7.98 price was a bargain. For those who wanted higher perfor­ mance in a .15 displacement engine, Cox offered the Olympic .15. It is shown in the second paragraph. At first glance, the photograph looks a lot like the Sportsman .15, but, in actuality, they are quite different in appearance. It’s just that the two black and white photo­ graphs do not adequately display the dramatic anodized coloring of some parts of the Olympic. The backplate/ carburetor assembly is anodized red, and the prop drive plate is blue. The render­ ing and shades of both colors aresuperb. If you mentally combine them with the The Cox Space silver-white color of the aluminum Hopper .049. A truly remarkable crankcase and the black cylinder, you’ll engine that domin­ have a good idea of the striking ap­ ated 1/2A competi­ pearance of the Olympic .15. Truly a tion for several years. beautiful engine. As for performance, the Cox product brochure for 1959 stated that the Olym­ pic .15 was, “ A super hot contest engine. Tests surpass any engine near its size. Equipped with precision ball bearings front and rear. Extra precise fitting of piston and cylinder to top contest requirements.”

FEBRUARY 1984 21 By MITCH POLING

Paul Mac Ready's Bionic Bat man-carrying, electric assist airplane has won the latest Kramer prize. Initial test flights were done at night by a full moon. Silent and invisible!

• Welcome to the wild and wonderful world of electrics! Bob Boucher and Paul MacCready have teamed up again (their last effort was the Solar Challenger, which flew from Paris to London on solar cells alone, with a pilot), to try for the latest Kramer prize. Kramer has been the inspiration for minimum powered flight with his gener­ ous prizes, and we owe him for that. Paul MacCready is the genius who always meets and beats the Kramer challenge, and Bob gets in there with his electric hardware that makes it go. This time the prize was for the first to fly the mile course in less than three minutes using only the power of the pilot, but with a twist! The pilot was allowed to store up energy in any device he wished for ten minutes. Rumor has it that the Japanese were trying it with Dr. Paul Mac Ready inspects the Bionic Bat. The aircraft bears a striking resemblance to the fifteen pounds of rubber bands! A team Solar Challenger, except it is much smaller. All Bionic Bat photos by Bob Boucher. from MIT tried it with Geist electric motors and rechargeable Ni-Cds, but other two for propulsion. The photo did not succeed. shows the plate for the motor/generator And now for Bob’s report on their mounting, with a belt drive for the success. He says that the MacCready system. The belt drive kept breaking, so team used three Astro Challenger (co­ a small chain was used in the final balt) 40 motors, one as a generator, the version. The generator Astro 40 had a

The Bionic Bat's propeller is concentric with the tail boom. The prop's six-foot diameter M otor and generator mounting plate. Three Astro 40 cobalt motors were used, one as a gen­ is driven by a bicycle chain, does 250 rpm. erator, the other two as drive motors. The Bionic Bat's connectors reveal its size.

22 MODEL BUILDER The new and the old ... Astro 05s, that is! See text for description of the new Astro 05. special winding designed and built by Bob to deliver four to five amps to the 36-volt battery at 9000 rpm. This took a Tracy Keneagy admires Heinz Koemer's Udet Flamingo. A Keller 50/24 SL with Jomar lot of muscle power, and Parker Mac- Speed Controller and 20, 1.2 amp-hour cells powers this scale bipe. The prop used is an 11-7. Cready (Paul’s son) trained for a couple The model weighs 7-1/2 pounds, has a 67-inch span, has a 1200 sq. in. wing. John Hickey pic. of months to get to the point of being makes ultralights look like 747’s! The of profit, but the gain in knowledge is able to deliver about 1/3 horsepower for span was originally 42 feet, but it was enormous. Can you visualize your own ten minutes during the charge cycle, increased to 50 feet by adding wingtips. Bionic Bat, good for Sunday outings? It and another 1/3 horsepower during the The landing gear is a single bicycle would be fun, and for us non-athletes, a flight. Impressive! wheel with two small wheels front and larger battery pack (about 10-Ah) would Us ordinary humans who potter rear for roll outs. The first flights were at be enough for half-hour flights. Dream around in our daily tasks are generating night, with only a quarter moon for light, on, but someday. .. about 1/10 horsepower, so Parker was and the plane turned out to be quite Bob also sends news of the latest cranking out 3-1/3 times the normal graceful in flight and practically silent. developments at Astro. The Astro 05XL human output. You could not see or hear the plane system has been upgraded with a new The battery pack was 24 Sanyo 1200 coming until it was practically on top of motor, the long frame motor that has mah cells (I am sure they are the same you . . . so, what better name than the been sold in the past as the Astro 075XL. I ones supplied with the Astro 05XL) in Bionic Bat? got a sample, and it turned a Top Flight four six-packs. The two power motors Bob went to Shafter (near Bakersfield, 7-4 nylon prop at 10,400 rpm with a 12- used the regular 40 winding, turning California) for four weekends in a row to ampere current draw from a six-cell GE 10,500 rpm with a motor run of 2-1/2 witness the trials and help out, but pack. I have not flown it yet, but Bob says minutes from this charged pack (about a missed the final winning flight . . . oh it will run on the ground for seven 30-amp draw, 15 per motor). This turned well. Thanks, Bob for the neat report on minutes, and that the fliers in California a six-foot carbon fiber prop at 250 rpm. the latest Boucher-MacCready project. are getting very good flight times with it. The prop was adjustable in pitch, so the By the way, the prize was 20,000 The new 05XL will turn a 7-4 prop at pilot had fine-tuning control of the pounds Sterling, worth about $40.000 thrust. The prop is concentric with the US. The effort probably didn't make a lot Continued on page 66 tail boom and was driven by a bicycle chain. Martin Calley and the Simi, California, crew (location of MacCready’s plant) built the plane out of carbon fiber structure and mylar covering. Thedesign is quite elegant, and weighs an incred­ ibly light 60 pounds, ready to fly! This

Shawn Theiss, a 10 year old modeler from The Solar Pup. at created by Shawn Theiss. flies on a single solar cell and electric m otor scav­ Florida, made this solar powered airplane. enged from a Cape Canaveral souvenir. Span is 26 inches, length is 14-3/4 inches.

FEBRUARY 1984 23 m u 9 r i ·,» ^ ν ~ ...... By AL ALMAN

Dan Lutz of Kraft Systems really can build, as proved by this photo of his handiwork. The J-3 Cub was constructed from Sid Morgan plans, and YOU GET WHAT YOU PAY FOR . . . savings on to us. Talk about your greedy way home from the gas station will get OR DO YOU? people . . . wow! (Could it be lhal the 10 you all the makings . . . at really nice, I'm all for the free enterprise system, percent increase in methanol makes up affordable prices. and regard entrepreneurs with awe and for the difference? wrf) I guess it’s only fair to mention that admiration; they're certainly entitled to A pox on them! I’ll not pay that kind of because of the four-stroker’s ability to their fair share of the market and to price ’cause there are alternatives . .. eke out its fuel supply, a ninety will make an honest profit. But,all toooften, and here is where you’ve got to decide average 16 minutes from an eight-ounce I gel the feeling that I, we, have been whether or not you want to stay with tank . . . so that you’ll get a surprising had .. . severely shafted, if you will .. . glow fuel, or convert to ignition. If amount of flying from your nine bucks- and right now the purveyors of fuel are you're gonna go glow, it’s simply a a-gallon four-stroke mix. But. if you at the top of my “ list.” matter of adding straight methanol to really want to talk economy, wait until Actually, this animosity started back in regular glow fuel; in my case, I mix two the ignition converted four-stroke does ’73 during that fuel oil crisis. I still gallons of methanol with one gallon of its thing; how about over thirty minutes haven’t figured out what synthetic and 15-20 percent nitro fuel as my Magnum from that same eight-ounce tank using castor oils had in common with Arabian .91S four-strokers seem to love six to $2.50 a gallon fuel? I really meant what I crude .. . but everybody jumped on the seven percent oil and five to seven said earlier about the ignition conver­ bandwagon and followed OPEC’s lead percent nitro . . . and I end up with three sion paying for itself within the first year in drastically raising all oil prices. I’d not gallons of this blend at an easy-to-take . . . or after just one season. forgotten about those unreasonably $4 per. However, if your engine needs I’ve been using the C.H. Electronics. large profit margins, but had sort of more oil, then only one gallon of alky Inc. unit on a variety of engines for two mellowed a bit on the subject .. . till the should be added to the gallon of two- years now, and can highly recommend latest unsavory practice: putting it to the cycle. Because methanol is available at it; Bill Carpenter, 224 Shamrock, River­ four-stroke fraternity. speed shops at $1 to $1.25 per gallon, ton, WY 82501, (307) 857-6897. is the The basic difference between two- your two gallons should also reflect an head man. cycle and four-cycle glow fuel is the oil overall lower cost than if you bought ★ ★ ★ content. Without exception, these four- four-cycle mix by the jug. (There’s my Fortunately, in most cases we do get strokers run better and more efficiently answer, wrf) our money’s worth, and here are two on 10 percent (or less) oil instead of the The other option, converting to igni­ prime examples.... “ standard” 20 percent we’ve all come to tion (which I prefer), does carry an The first good guy, Doug Mac Brien know and love. So, the burning question initially higher cost . . . but, if you fly a (24 Truby Street, Granby, MA 01033, is . . . if four-stroke fuel has at least 10 lot, the savings in fuel will easily pay for 413/467-7971), peddles Druine Turbu­ percent less oil than two-stroke fuel the ignition unit by the end of that first lent and OS2U Kingfisher plans . . . but, (assuming both have the same nitro year. You’ll also end up with an even oh, what a difference between Doug’s content), why do the fuel people de­ quieter running engine and the ability to stuff and most others. I haven’t seen the mand the same price for both? Surely, swing an even larger prop. And, of Kingfisher, but his “ Turb" plans and 16- being able to use half the amount of oil course, you won’t be dependent on page instruction book both havemucho in a four-stroke mix lowers their cost. . . glow fuel people; a visit to your local G-O-O-D-N-E-S-S; they reflect care and and yet they refuse to pass that obvious chain saw or small engine shop on the attention to detail.

L E F T : Noal R. Hess b u ilt this super Waco YKS-6 from Bob Morse plans. A t 35 pounds, it's kind of a heavyweight, which keeps the Kioritz 2.4 working hard all the time. Noal does nice work! li® RIGHT: Doug Mac Brian sells a fantastic plan package for this D ruine Turbulent. Unfortunately, the snow covered field and bright R fe M r blue sky don't come with the purchase. . .

24 MODEL BUILDER came out weighing 14-1/2 pounds with Quadra Clark Foy, of Ontario, Canada, cranked out this flawless, 27-pound Super-Fli fro m the engine aboard. The model was covered with silk Ohio Superstar kit. He used two-ounce fiberglass cloth and resin and acrylic enamel and finished with nitrate dope. to get the finish he wanted. E.T. pilots the Quadra 50 powered model. Mac Brien’s instruction book also in­ cludes good reminders and advice From Peculiar, Missouri, comes about safety, all of which come under, Bob Chanslor's great flying Great "Flight Testing and Safety Considera­ Lakes bipe . .. built from Model Builder plans, and Quadra power- tions." As mentioned earlier, he really ed. A bad Ni-Cd made the nice does care! birdie go BOOM, but Bob some­ ★ ★ ★ how pieced her all together again. The other good guy, SR Batteries’ This time Chanslor said he's going Larry Sribnick, usually goes around to use the Ace R/C R edundant Battery System for safety. Good disguised as a mild-mannered contribu­ idea! ting editor to Popular Photography magazine . . . but dons his "Super Bat- teryman” suit (in whatever phone booth happens to be available) whenever he hears a cry for help. And help is what he gives, ’cause SR batteries are different, simply because they're better. Now, I’ve never met Doug, but he Mr. Mac Brien, this design, with its fixed I have to take Larry’s word about all earned a permanent place on my good wing slots, is very close to scale . . . and the technical stuff, like his cells being guys list as soon as I looked at his plan he includes info on how to obtain docu­ spotwelded internally for reliability, and package. . . because forthirty bucks you mentation in case you just gotta go using a vent system that’s resealable, not only get these good plans and whole hog. This is a well-proven air­ mainly because I don’t have the time nor instructions shipped rolled, but Mac plane; the original flew for a year, then the inclination to start dissecting cells to Brien has also included something that the MK II was built in '81 . . . and to date see what makes them tick. But, I do has never been done right the very few has over 115 hours of flying time. I sure know that I’m consistently getting a lot other times it’s been attempted: a can't tell you that I've flown this one, more capacity (about 20 percent) out of booklet of very clear, easy-to-read and 'cause I haven’i . . . but I have seen a few SR packs as compared to other brands of informative photos. There are over forty of them fly extremely well in spite of the same rating . . . and this is the kind of of these first-rate halftones; most show being controlled by barely competeni insurance I cannot do without. There’s different areas of construction, and a pilots. no argument that batteries are the few are of the full-size bird, cockpit, and By the way, Doug is adding a 1/4-scale weakest link in our system,so,obviously, instrument panel. And Doug notes any Dalotel DM 165 to his lineup, and it the better the battery pack is, the better changes or revisions on these pix. should be ready by the time you read and more reliable the radio link is going Designed for the Quadra, this 86-inch, this. He’s just starting to test fly the to be. 17-pound BIG Bird is highly aerobatic prototype, and so far she flies as good as Although I normally use 1200 mah . . . although if low and slow is your she looks. This one also came out to 17 receiver packs (my SŘ 1200 packs act thing, you can throttle back and enjoy pounds and 86 inches, but has a Zenoah the Turb's great stability. According to Quartz 2.3 for power. Continued on page 97

RIGHT: Ikon N'wst Porterfield Flyabout It handles well, both on the ground and in th e air, and has that "different" look. Now all I have to do is get Neely to put pilots in his cockpits. Enya .90 four-stroke powers the m odel.

F E B R U A R Y 1984 25 cPsítm 9 % ^

By DICK HANSON Jim Eides, of Denver, Colorado, flew in the Dave Stuart, of Logan, Utah, placed fifth in Masters Class at the annual Las Vegas event. Expert Class with this CAP 21. • We had a ball this summer working let me know! World Engines recently published an with the new four-stroke engines. So far, Last month, we entered an 825 sq. in. ad which claimed the O.S. .90 turned an we have only flown the O.S. 1.2 and the Dalotel in the Las Vegas annual pattern 11-7 at 12,600, but O.S. literature gives Enya .90 models, but we've learned a few contest. The engine used was the Enya 11,000 rpm as desirable max speed. We more things that may interest you. .90. This was not an arrangement we will make up our own mind on this one. First off, the propellers available to the thought best, but it was all we had While I was at the Vegas contest, I met average modeler are designed for two- together at the time due to an untimely one of the Australian FAI Pattern Team cycle engines, and don’t offer the pitch radio failure on our V.F. powered bird. members who had stopped in to see the or blade shape we found to work the Unfortunately for me, the engine quarter-scale event. I can’t remember best. After reworking a number of simply didn't have enough poop to fly his last name, but Tom and I spent some props, it appeared that the Enya .90 the larger maneuvers in a model that time comparing notes on four-strokers. pulled best on a 12-10 narrow blade. large. Nevertheless, many of the fliers Apparently, the Japanese are actively Static rpm is about 9800. took it for a spin (no pun), and the using these engines, and have even The O.S. 1.2 was run on many sizes and general impression was that the four- found tuned exhaust lengths which add shapes, but we have found a blade that stroke works well! power. I will pursue this! seems “ just right." It’s the D.W. 13-10. It I think we have "zeroed in” on the He also m entioned an interesting turns these props at a static rpm of engine-to-plane size relationship now, thing about rubber mounted .60 two- 10,000. A glow plug that seems to work and we are more convinced than ever cycle engines he was using. His tests very well is the plain old K.B. Long. O.S. that the four-strokers are here to stay. showed a three to five decibel noise offers a nice plug that works well at While we were trying to decide what reduction using a very soft mounting speed, but oddly enough doesn’t idle, size model to try next, we found out O.S. system. That’s a very large reduction in transition, or “ needle" as well. was releasing a .90 four-stroker. Natu­ sound level! We bought a number of these expen­ rally, we had to have one. So . . . yester­ Merle Hyde showed me a rubber sive beauties, and frankly, I can’t find day the UPS driver dropped one £t the mounted engine in his son’s model. It any reason for their special shape or door. (Not literally, we hope, wrf) looked very unusual, but worked very price. The fuel we are presently using is a The first thing we noticed was the well. The model was quiet as a mouse. If ten percent Dick McCoy oil, two per­ weight: about 24 oz., not much more possible, I’ll describe it in next month’s cent castor, ten percent nitro blend that than a .60 two-cycle. After looking it article. one of our pattern fliers put together for over carefully, we noticed the intake The pattern contest at Vegas is always his O.S. V.F. 61. I am satisfied that this port is almost 180° from the exhaust excellent, well run, lots of fliers, super fuel runs better than any mixture I’ve port. This reminded us of the head judges, the whole bit. This year we had ever tried, and repeated examination arrangement on the old Chrysler Hemi. contestants from Logan, Utah, Steam­ shows no increased wear. It also runs A very straight path in and out of the boat Springs and Denver, Colorado, like crazy in the O.S. gearbox engine. combustion chamber. Mudpuddle, Washington, and of course, The performance increase on all engines O.S. says 11-7 or 11-8 props can be all of Los Angeles. I’ve included some tested is very obvious. I can only assume used. This is very different information pix of these contestants and their that the friction or internal drag is than that furnished with earlier four­ models. greatly reduced when using the McCoy cycle engines. I can’t wait to test it. In We will be back next month with oil. If any of you lubrication specialists fact, I am whipping up a 750 sq. in., more on the new engines and noise have any solid data on this stuff, please seven-pound model to test fly it. reduction techniques. ·

Ron Loeber's Hippo flies with a huge, special Rossi head on a Rossi John Gayer, of Colorado, flew this sharp looking Curare at the Las .60. Scene is the annual Las Vegas contest Vegas aerobatic (Pattern) contest.

26 MODEL BUILDER Jim Hall (left) and Woody Woodward pose for the camera at the Sepulveda Basin. California. Jim built his Volts Wagon in one week. VOLTS WAGON By WOODY WOODWARD . . . Electric powered R/C aircraft are clean, quiet, and simple to operate. The Volts Wagon is no exception. The following article is a "must read" for all potential electro-fliers!

• WARNING: Electroflight has been soaring circles; (4) unless you have an balancing; and the ability to change determined to be habit forming. There extremely small radio system, it gets propulsion units (motors) from make to are varified reports on file of R/Cers terribly crowded inside those narrow make and size to size without undue eliminating their noisy and oily glow glider fuselages; and (5) a two meter complications . . . hence, the VOLTS engines and replacing them with electric sailplane is a fairly ungainly sized air­ WAGON'. propulsion units. frame with its six-foot-plus wing. (Ad­ With a wingspan of 54 inches, a wing Shocking, isn’t it? mittedly, item three is hardly a necessity, area of 432 square inches, and a flying During the past few years, whenever I but it is very convenient for taxiing back weight of around 40 ounces, the super was asked how best to get into Electro­ to the pits after a rewarding flight). functional Volts Wagon achieves all of flight, my advice was to get a good two- There must be a better way! the aforementioned criteria. Note that, meter glider like the O/y 650 or the The “ better way" should be at least as because of the way the front end is Gentle Lady (there are many that work good a performer as a two-meter sail­ designed with its open bottom and well . . . whatever you can shoehorn plane, but be less bulky, more compact, removable hatch on top, virtually every your equipment into), and to get one of easier and quicker to build, cost less, and available motor in the 05 to 10 range can the 05 electric motors from Astro or take into consideration the specialized be easily fitted. The motors are simply Leisure. While this was good advice, and needs of the electric powered airplane suspended from Former A, and it turns does provide a workable starting point, and its uniaue systems. Such needs out that all the bolt patterns are the the fact is that (1) sailplane designers do would include adequate ventilation for same! Even the new Astro Super Ferrite not allow space for the bulky electric the motor and battery pack, easy access 10 and the Astro 15 Cobalt will fit, propulsion batteries; (2) fitting the to the battery pack for its replacement, though I car. hardly recommend such electric motors is not always a simple the ability to accept a variety of different overkill. task; (3) the inclusion of landing gear battery packs (i.e. 1200, 800. 550 mah The landing gear rides in a vertical slot and a steerable tail wheel is just not high cells), provision for fore and aft move­ that allows it to be removed in the event on the list of desirable features in ments of the battery pack for ease of that you decide to fly from tall grass. The

FEBRUARY 1984 27 Before and after covering. The Volts Wagon is a simple, easy to build, electric powered sport plane for 05 motors. The bare VWhas the Astro belt drive unit, the other, a Leisure unit. steerable tail wheel allows you to taxi BELOW & RIGHT: The VW has an ingenious back to the pits. And of course, the radio and battery installation. The bottom combination makes takeoffs a simple compartment houses flight battery, the top matter. one houses the receiver, servos, RX pack. The VW has been tested with five motors, two battery combinations (six­ cell and seven-cell), eight propellers, two speed reducers (gear drive and belt drive), and two wings. Both wings are the same except for thickness. The first wing (and the one which is included in the plans) has a fairly thin, nine percent airfoil section with a sharp leading edge, and the other one has a 12 percent section with a more rounded leading edge. The difference? The VW flew surprisingly well from the very first flight using the thinner wing, however, typical of this kind of wing, it does drop a wing (tip stall) rather quickly if you get careless and do not watch your airspeed. Out of curiousity, I built the thicker, 12% wing. It flew quite well. As a matter of fact, it was (if anything) easier to fly with a “ softer'' stall and no tendency to drop a wing ... no doubt easier for a beginner to cope with. However, the VW was not designed for beginners. .. you'd better know how to fly before tackling this one. The Volts Wagon is an entry level electric plane . . . NOT a trainer. You may ask why I have saddled you with the "trickier” wing? The answer is thermal riding. The thinner wing is a superb thermal hunter. If there is any lift present, any rising air at all, the VW wobbles slightly and begins to rise. There is just noway tostop it! Oddly,the thicker wing displays little of this charac­ teristic, and just bumbles its graceful way right on through the "bubble” and out the other side. I thought you’d like the wonderful ways of the thinner wing. If you’re chicken, fatten the airfoil 1-1/8 inch at rib W1 and project the other ribs accordingly, then you’ll have a nice, docile trainer .. . Boo! Now that you’ve decided to build this

Continued on page 87

28 M O D E L BUILDER F E B R U A R Y 1984 FULL-SIZE PLANS AVAILABLE - SEE PAGE 96 29 CHOPPER

By RAY HOSTETLER PHOTOS BY AUTHOR CHATTER

• To lead off this month, I received a pilch change mechanism) developed a letter from Steve Snoen of Surrey, British lot of play. A slider ring assembly from a Columbia, Canada. (I might mention Kalt Baron 60 was fitted, and now there is here that you Canadians have sent as no play whatsoever. This modification much correspondence as pilots in the required quite a bit of re-working to the U.S. Thanks for your support!) Steve has frame plates. Also, ball bearings were sent some excellent black and white put in to replace bushings in the rotor Ray Hostetler runs up his JetRanger using photos of his club’s training area, (more head. two wheels and a plywood board. See text. later) and also some photos of his “ Please find enclosed some pictures modified Baron 20. Look at that nice of myself and the Kalt Baron 20. (O.S. BACK TO BASICS stabilized inverted hover! Steve has 28-H, JR radio)." Last month, I finished by publishing a obviously "done his homework" and To answer Steve's question about letter asking for help in the Chicago produced a fine flying machine. He rolling: This is due to the rotor head area. To pick up where we left off with writes: rotation of the helicopter. Helicopters training. I’ll give you a few tipson how to . . Some comments about the Kalt with clockwise rotor systems will roll get in contact with proficient helicipter Baron 20. I have flown it both with and fine to the right (clockwise) while pilots in your area. without the optional Bell/Hiller mixer, helicopters with counter-clockwise If you find yourself out in the middle anil my experience is that the Baron 20 rotor systems will roll easier to the left. of nowhere with little contact with other should always be flown with the mixer. Rolling against rotor rotation is more pilots, make up some nice five by seven Without it, it is very slow responding, difficult as the ship has to fight the cards with your name, address, phone like any helicopter with just Hiller gyroscopic force at the main rotor. number, type of helicopter, radio, and control. With the mixer, it will loop and So for those of you who are just about engine. State that you are looking for roll. It rolls reasonably clockwise, hut to get into aerobatics, always do your help with initial trimming and hovering. really poorly anti-clockwise. Is there a first rolls with plenty of altitude, and Take these cards and distribute them simple way to explain this> with the rotor rotation. (probably by mail with a note of expla­ “ To improve the acrobatic capability, As far as aerobatic capability, I told nation enclosed) to all of the hobby what changes do you recommend? Steve that he had probably worked the shops within a four-hour drive of your Thinner paddles, longer/shorter flybar, Baron 20 as far as it could be worked location. Just ask them to display the more/less Bell mixing, shorten the rotor without going to a completely different card on the counter, or pin it up on the blades or more rpmt Any suggestions rotor head. If you look closely, the "For Sale” bulletin board that most are most welcome. I have tried thinner photo will show the bearings Steve has shops have. paddles (Competitor), but they did not fitted into the Baron's rotor head, along Another way to find helicopter activity do anything for it. except making it less with the new swashplate and servo is to go the fixed-wing flying sites and stable in hover. placement. Thanks for your input, Steve, ask if they know of any helicopter "Some of the changes I have done to it is appreciated. activity in the area. Usually, you can get a it: Moved the cycl'n servos directly under the swashplate. thereby eliminat­ ing two bellcranks. After 10 gallons of fuel, the stock swashplate had developed excessive play in the bearing. A Heli-Boy swashplate is now working really well. Also, the slide ring assembly (collective

Steve Snoen flies his modified Baron 20 in- Steve Snoen shows us his group’s helicopter run-up area. Obviously, these Canadians have verted. Nice grass field is a luxury. put safety and convenience first as the wire cage and strap equipped table demonstrate.

30 MODEL BUILDER name or two, or a general location and time where local heli-pilots fly. From my experience, it’s pretty rare where air­ planes and helicopters fly at the same field. The two just don’t mix. TRIMMING After two months of lead-in discus­ sion, here we are. . . The actual trimming process is pretty straightforward. Take your ship (with training gear) out to a smooth parking lot in a secluded area on a calm morning or evening. Do a little pre-flight, that is: check all servo con­ nections, servo throws, and major bolts such as those which hold on the blades and main rotor head. Also, check main and tail rotor blades for correct rotation, especially tail rotor blades, as they are smaller and harder to see than main rotor blades. Which reminds me of a little story... Years ago, while Dad and I were still learning how to rotor, I had come home from college one weekend, and we Steve Snoen's modified Baron 20. Receiver is well protected from vibration with foam rubber. were practicing together indoors in a local gym. All went well for the week­ transport the helicopter, one blade had tie the helicopter to for initial run-ups. I end, and I left to go back to school that to be removed to fit the ship into the am speaking of the very first time out for Sunday afternoon. Later in the week, I trunk of the car. On that initial assembly, any combination of helicopter or radio had a chance to talk to Dad, and asked if Dad had inadvertantly placed the blade . . . an old radio in a new helicopter, or a he had a chance to do any more practic­ on upside down, so that the leading new radio in an old helicopter. This is ing since the past weekend. He said that edge was trailing, and the trailing edge handy to check the entire system out so he had, and all went well except for one was leading. Now this was not as stupid you are sure it runs glitch free, and also minor problem. It seemed that on the as you might think. As the helicopter was to set main rotor pitch and blade track­ initial flight, the helicopter had exhibited ing. a Kavan letRanger, it had symmetrical a severe vibration at anything above What I usually do is start the heli­ quarter throttle. It was run up toquarter blades, so there was no difference in copter, then place a piece of three- throttle and back down a few times, until airfoil section top to bottom. And as the quarter inch thick plywood, four to six it was obvious that something was blades were painted with K&B Super- inches wide, and two to three feet long, seriously wrong. Dad shut down the poxy. there was not the telltale line that between the ship’s belly and on top of ship, and began to look it over to see sticky-backed covering materials leave the skids. I let the plywood stick out to what could possibly have happened to where they overlap on the underside of the left and right of the ship, and keep generate that much vibration since the the blade. It all ended up in a very funny the ply piece as directly under the main last time out. In a few seconds the episode that could have been caught shaft as I can get it. When the ply is problem showed itself . . . one of the with a preflight inspection. main rotor blades was on backwards'. To It is nice to have some sort of stand to Continued on page 67

SLIGHT RIGHT CYCLIC HOOKS OR PEGS APPLICATION OF RIGHT CYCLIC ON COMPENSATES FOR LEFT DRIFT, SHIP GROUND DOES NOTHING 3/4" PLYWOOD FOR EASY TIE / DOW N HANGS RIGHT BECAUSE SKIDS BASE SCREWED J? AS A RESULT TO FL A N G E J HOLD FUSE. LEVEL THRUST FROM T/R WANTS . TO S L ID E -----) A tf— W IN D HELO LEFT'’ h (C/W ROTOR) FLANGE SCREWED TO TOP OF PIPE (C/W ROTOR) ______< ______i ______APPROX 5-1/2—6' TYPICAL ERROR BY NOVICE RESULTS TO POSITION TYPICAL "RIGHT SKID LOW" IN OVERCONTROLLING AS SHIP TYPICAL METAL HELICOPTER'S HOVERING ATTITUDE BREAKS GROUND MECHANICS AT ^PLUMBING PIPE FIG. 2 EYE L E V E L 1-1/2" DIA. FIG. 1

O P T IO N A L COUPLER TO DETATCH PIPE FO R E A S Y ONE OR TWO WASHER TRANSPORT SHIMS UNDER LEFT SIDE OF FUSE. RIGHT BOW CUT (2°-3° RIGHT 1/8"-3/16" SHORT LEAN

LEAN) COMPACT CAR TIRE FILLED WITH CEMENT EXAGGERATED FOR CLARITY EXAGGERATED FOR CLARITY IDEAL RUN-UP STAND SHIMMING THE GEAR (OPTION 1) SHIMMING THE GEAR (OPTION 2) (TYPICAL LAYOUT) FIG. 3 FIG. 4

FEBRUARY 1984 31 DIG Bird PART TWO By ELOY MAREZ .. . This is the second half of a story which began last month dealing with the safe, reliable, and effective use of avail­ able R/C hardware in assembling a large scale aircraft such as the German made CAP 20 you see to the right.

CONTROLS The control hardware is always impor­ tant in an R/C airplane, and gets more critical as the size, weight, and speed increase. Again, this being my first such effort, it was a revelation to discover just how much large airplane hardware is available to the builder. To start with, for the very important hinges, I chose Du- Bro Products new Heavy Duty Scale Hinges, No. 257, a kind of king-sized Eloy'sBIG Bird is this 3/10-scale CAP 20. How he put it all together is detailed in the text. version of the standard pinned hinges we’ve all used so successfully for so many years. This hinge is 3/4-inch wide by 1-13/32 inches long with both holes and raised letters which both help lock it in place with whatever adhesive is used. The hinges are furnished with a remov­ able 3/64 cotter pin which allows com­ plete assembly of the control surface and then separation for painting. After reassembly, the end of the cotter pin can be bent to prevent its falling out, or as in my case, one can use a single, long piece of 3/64 piano wire to run the entire length of the control surface. In this case, I also used another Du- The well-known Kraft 16-ounce fuel tank is seen here along with its new cousin, a 24-ounce Bro product for pushrods, it’s No. 144, version for bigger BIG Birds. The same quality and features are apparent. 4-40 Threaded Rods. These pushrods were used for aileron actuation, and on Cimarron Rd„ Las Vegas, NV89117, (702) tions, but I have been on one end of a the rear end of the arrowshaft elevator 878-1305. It is part of a control cable spring scale showing 55 pounds, and pushrods. Actually, Du-Bro makes a 4-40 assembly package, consisting of a multi­ bottomed further, trying to pull one of pushrod, complete with clevis, but I strand teflon coated steel cable, one end these cables apart, with no success. was unable to obtain the whole assembly of which comes with a swaged ball in The ball on one end allows one to locally just when I was at that point in the place. This end goes through a threaded rotate the ferrule around it without re­ construction process, and had to join ferrule, onto which the clevis is installed. moving the clevis for final adjustments. two products. The other end, after the cable is cut to Called "Super Clevis,” this neat control The clevis in this case, also used on the size, is attached to an identical ferrule system is available in two lengths: a rudder cable assembly, is obtainable using Hot Stuff. Now this may not seem package of four 48-inch cables and eight from International R/C Specialties, 2310 to you like the most secure of connec­ clevises, for $10; and a package of four

These nylon wing mounting bolt guides, installed into a length of Drill press cuts the round hole The nylon guide, in the wooden dowel, dowel, provide neat, recessed fittings. From Sonic-Tronics. for the dowel. Neatness counts! in the wing core. Use epoxy glue.

32 MODEL BUILDER The lightest four-inch wheels we could find: Powermax wheels from The all-important control surface hinges. Pin allows the surface to be England, available from the San Diego company (importerfor US). removed for painting, etc. From Du-Bro Products: Heavy Duty!

A good tail wheel assembly is very important on a model of this size and weight. These CB Associates Small, lightweight, powerful servos are always welcome, and the Kraft Systems KPS-28 heavy duty parts fill the bill nicely. Spring loaded! coreless servos were chosen because of those qualities. Size comparison with 550 pack. 82-inch cables and eight clevises for for the threaded ends of the rods, others bend, and into a hole in the side of the $11.50, with 50c postage in either case. were soldered in place on the other end, shaft. See the enclosed sketch. A small The complete cable and clevis assembly as I really don’t see the need for a shot of epoxy on the plug just before it is was used on the rudder, which was a threaded adjustment on both ends of a installed into the shaft seals the whole cause of some concern for me as those pushrod. Now some of you may not thing together forever and ever. long metal cables are running parallel, agree with that business of soldering on Now for the control horns. I chose and and not far from, the receiver antennas, clevises, as we've all seen disasters used another C.B. Associates product, and could conceivably cause blanking at caused by just such an arrangement Large Rudder Horn, No. 5546. These are certain attitudes. Not so . . . ground coming loose, but I can assure you that a extremely strong, 1/8 in. thick, rein­ range testing showed no such problems, properly made silver solder connection forced nylon horns, that are 3/8 inches and by now I've done enough flying (see my article, MB, May '78. . . my, how high from the base to the farthest hole. with the bird to be convinced that the time does fly!) will not come loose. They even have a reinforcing web be­ Kraft KPR-8D receivers are not letting The pushrods are arrowshaft push- tween the perpendicular surfaces and a themselves be bothered by such petty rods, with homemade wooden dowel brass bushing for the clevis pin to ride in. things! plugs in the ends. These are very easy to These were used on the ailerons and ele­ Anyway, as I wasn't able to get the 4-40 make if you have a Unimat or similar vators, submounted onto a piece of 1/8 Du-Bro clevises in timed substituted the small lathe, or could even be made on an Lite Ply inlaid in the surface, and into R/C International Specialties clevis, electric drill with a file. The wire goes which No. 6 blind nuts were inserted to which is 4mm. Some were tapped to 4-40 through the plug, takes a sharp right hold the horn mounting screws. Upon

The finished fitting. Epoxy/microballoon mix A variety of nylon wing screws are available in different lengths, sizes, and heads. Sonic-Tronics is used to fill in around nylon guide, sanded off. Driver aids in the assembly of wings, cowls, etc., without risk of slipping and scratching paint.

F E B R U A R Y 1984 33 Fiberglass pushrods are solid and secure with Eloy's homemade For cable actuation, Eloy uses the newly introduced cable, ball, and wooden plugs and Du-Bro's metal rod and clevis combination. clevis fittings from International R/C Specialities, Inc., Las Vegas.

Fiberglass pushrods can be made using arrow shafts. A wooden plug, made from dowel, is turned on a lathe or drill press to obtain the shape depicted here. To assemble, slide the dowel away from the bend, insert the bend in the shaft and into the hole, slide dowel into the shaft. double horn. These tailwheel assemblies consist of multipole spring steel leaves, with prebent wire axle, horn, and actua­ ting springs. Even with the rather high angle between the rudder and wheel horns, and with the extension required to the actuating coil springs, thesteering action is positive enough for good ground handling, yet the coil springs dampen and stop shock from entering Control horns can't be overlooked as an important part of the surface control system. The into the rudder control system and the CB Associates No. 5546 horn is used here. Du-Bro pushrod. Ply door covers servo. servo. A highly recommended item. final assembly after painting, a drop of plies is a horn on each side of the control TELE-TACHOMETER Locktite on each screw is a must. surface, just perfect for the cable pull- Another item for which the wiring was The rudder and tailwheel are actuated pull assembly. The C.B. Associates No. installed, but which has not yet been via a C.B. Associates Double Rudder 5515HD Heavy Duty Tailwheel Assembly Horn, No. 5545, which as the name im- is also actuated via springs from this Continued on page 90

Large diameter props require extra care in balancing. This High Point Balancer is ex­ Dave Brown Products Mix-A-Matic epoxy The Digicon Tele Tachometer tells you the tremely sensitive. Extensions are used when is the best epoxy found for working on epoxy engine's rpm while the airplane is in the air! working with large diameter propellers. fiberglass fuselages. Also tells you the airspeed of the model.

34 MODEL BUILDER 1. C liff Silva can't bend over to launch his model, so he has to depend 2. Larry Clark prepares his Foo-2-U-Z This design was Dick on young helpers. This can be rough if the helpers lack experience. Obarski's answer to the Goldberg Zipper. link. With thelossof all up warp trim, the result was a wire screaming dive into terra firma.” (And we mean firm!) Chandler reports the model is still intact, and with a few repairs will again fly the dawn patrol. This writer looks P L tK S P Ř R K S askance at this idea well knowing what By JOHN POND the German name Taube means .. . "dove!" I’ll give you one guess what the / \ favorite hunting game of a hawk is .. . anyone for an all metal Junkers D-1? • Another season of Old Timer flying is kudos for making this event possible in SCAMPS Newsletter Editor Al Richard­ drawing to a close, and perhaps it is time the fall. son reports that attendance by the to review those models (and modelers) I have received several reports on this SCAMPS was low because it was raining that seem to win consistently. In be­ meet including one from Bruce in the Los Angeles area. However, after tween we will, of course, intersperse Chandler, the contest director of the getting over the L.A. hills, the weather reports of interesting contests, meets, meet. Rather surprisingly, the CD did started clearing, and got better and and get-togethers that have some inter­ compete in the Flying Scale event, this better and . . . Sunday was as pretty a esting sidelights. time with a brand new Taube based on flying day as you could find anywhere. Probably the oldest active West Coast the concept that all old German flying Matter of fact, Chandler commented SAM chapter is the Southern California machines are superior. As Bruce reports, that even tool boxes were getting “ max" Ignition Flyers (SCIF), SAM 3, which “ While cruising at 2000 feet, the un­ flights. He estimated if they could have recently held its 17th Annual Texaco armed machine was attacked by a for­ bounced Lee Freeman’s old Cadillac Contest. Although due credit should be mation of two, well-armed, red tailed high enough, he would have gotten at given to the Southern California Antique hawks. The talons of one snapped the least four minutes! As it was, four back- Model Plane Society (SCAMPS), SAM guy wires between the rudder kingpost to-back maxes in a series of six flights Chapter 13, for initiating the Texaco and the trailing edge of the stabilizer was good only for fourth place! event, the SCIF club should receive effectively breaking the trim adjustment Some of Bruce's observations con-

3. Even the best break models! Sal Taibi 4. Bill Cohen never lets the wheel chair bother his engine starting technique. Ross Thomas H o t S tu ffs an Aerbo together. ho ld s the Anderson Pylon.

F E B R U A R Y 1984 35 5. Here's a nicely built Hank Cole Smoothie by Mike Moskow who 6. Not often seen at Old Timer events is this Cleveland Norseman, a is seen holding it up for the camera. perfect model for the 36-inch Commercial class. Builder unknown.

7. An exact replica of Albert Judge's 1936 Wakefield winner as built by Dave Baker, SAM 35, England. cerned Cliff Silva using his old Corben Ace to place in Flying Scale after losing out in his favorite event, Texaco. He employed two models, a Petrides Dol­ phin and a Fiske Hanley to no avail. 8. C lyde A u s tin 's Commodore in final stages of restoration by Gordon Codding, Kingman. Photo No. 1 shows what a real model Arizona. Thirty year old structure and covering is very dry and brittle. addict looks like. Cliff Silva, permanently confined to a wheelchair, flies with the ing of patience! So many times this long time to adjust. As reported in best of them. Most amazing is the way he writer has seen poor launches damage earlier issues, this design by Dick Obarski handles a huge 14-foot model like the his models. was actually produced in 1939. Obarski, Roll Berryloid model. One thing for While we are at it, we might as well it will be remembered, worked with sure, if you have to depend on inexperi­ show Photo No. 2 of Larry Clark, former Goldberg in the development of the enced help to launch your models (from SCIF prexy, with his Foo-2-U-2. Like all Zipper design, doing much of the test the ground), you really learn the mean­ of Larry’s models, this one has taken a flying to “ debug" the final kit design.

9. HELP! Art Suhr sent in this photo to get an identification. Anyone out there remem- 10. Contestants gather for a group shot at Kearney Mesa contest, San Diego, California. Mel ber this one from 1937-'38, Los Angeles area? Anderson can be seen rubbing his eye. Photo courtesy of Bill Simpson.

36 MODEL BUILDER 11. Here are a couple of famous boys: Joe Elgin (of Playboy fam e), 12. Sid Sutherland, England, likes his Delong 30 powered Korda and Chet Lanzo (right), with of all things . . . gliders! Powerhouse. He says it's the most stable model he's ewer flown.

Any of you would-be competitors O/T Pylon Gas reports received from Gene Wallock, who say they don’t have a chance against 1. Al Richardson...... 25:00 CD for that day. the "hot shots’’ would do well to take a 2. Larry C lark...... 23:42 Of course, there were other rubber look at Photo No. 3 showing one of the 3. Dick Lyons...... 23:33 events held in conjunction that day (O/T best competitors of all time, Sal Taibi, O/T Scale Rubber, Thirty-six Inch Commercial, repairing a model on the field. This is 1. Cliff Silva...... 23:22 Eight-ounce Wakefield, and Scale), but simply the difference between winning 2. Bruce Chandler...... 19:38 the big attraction was the Twin Pushers! and not winning: the determination to 3. Carl Taylor...... 15:20 Wallock further reports that the team win. Actually, some luck enters into any employed by Ed Wallenhorst to get his form of competition, but it does boil Texaco model wound and launched consisted down to one thing: practice. If your 1. Terry O’Meara...... 36:07 of the following: model is ready to go come the day of the 2. Cliff Silva...... 19:33 3. John N o g y...... 18:10 Holder ...... Bill Krecek contest, you will eventually get your L.H. Winder...... John Camp share of the trophies! O/T Rubber R.H. W in d e r...... Ed Wallenhorst The boys have really learned to make 1. Andy Faykun...... 13:08 Lifter & Fuseman . . . . Gene Wallock their engines run economically as wit­ 2. Dick Seifried ...... 12:06 Laughing Clown...... CarlHatrak ness the Cannon 35 used by Terry 3. Dick Ellington...... 3:07 Gene feels that all they needed was O’Meara in his Ray Heit Scram. With the Commercial Rubber some music in the form of asingingdog, engine fully choked down, engine just 1. Al Richardson...... 4:48 and they could have made it at the ticking over, some fellows claimed the 2. Carl Hatrak...... 2:05 "Tonight” show. Gene’s final thoughts: motor was still running when it passed out of sight at 22 minutes!! Just to prove SCAMPS TWIN PUSHER CONTEST "Jim Adams provided some real style Wanna have some real fun and some with a flight total of 0:07 seconds! That’s the flight was no fluke, Terry put up a laughs at the same time? The Twin a two-flight total!! Maybe we could get second flight for 36 minutes! Pusher Contest as pushed by the Jim Adams to write a few paragraphs for 1/2A Texaco SCAMPS is just the greatest according to the column giving his expertise on how 1. Bill Cohen ...... 44:07 2. Carl Taylor...... 31:45 3. Sandy Chapin ...... 29:26 O/T Cabin Gas 1. Jim Adam s...... 18:17 2. Dick Lyons...... 17:47 3. Larry C lark...... 15:15

RADIAL MOUNT LAYOUT

OHLSSON 60 CUSTOM DRAWN BX ALLEN POND X---"sk o b b r ^ L 6BBS 13. M. R. Kemp releases a replica of Arnes 5 1/ 2* - Blomgren's 1949 Wakefield. Scene is the Odiham Vintage Wakefield Event. (Miller)

FEBRUARY 1984 37 15. Bob Moulton appears ready to launch his 14. Roy Biddle sends this photo of a lovely Scientific Victory which he built. This is another streamlined twin pusher. Site is Bong Field, good flying Korda design. site of 1984 SAM Champs. wherein Dave Baker (the SAM 35 spark ENGINE OF THE MONTH to trim twin pushers (for precision dura­ plug) has faithfully recreated Albert Having turned the engine manufac­ tion)." Haw-w-w! Judge’s 1936 Wakefield winner. To turing business literally on its ear in 1938 FUN FLY prove the model’s authenticity, Dave with his sensational Ohlsson 23, Irwin We might as well give the rubber band copied this one from an original kit Ohlsson decided to come out with a big boys their due as more darn fun is being loaned by Bert. You can't ask for a more had with the Thirty-six Inch Commercial exact replica than that! Flies great too! Continued on page 80 Rubber event. This is simply an event limited to cabin type models not ex­ OLD TIMER Model of the Month ceeding 36-inch wingspans. Ed Wallenhorst, who recently joined the SCAMPS, has proven to be quite the Designed by: Roy Wriston competitor winning first in Commercial Drawn by: Al Patterson Rubber, first in O/T Rubber, and second Text by: Bill Northrop in Eight-ounce Wakefield. Busy boy!! The most interesting model on the • Somewhere in time be­ field was the 1940 Record Holder by tween the disappearance of Wallenhorst. This model has been motor sticks and the arrival of recently approved by the SAM Board of folding props, the ‘‘diamond" Directors. The model design could com­ fuselage rubber model came pete in the modern Unlimited Rubber into existence. There doesn’t seem //-£? event and do very well. The design looks to have been any logical, aero­ of two outer wing panels put together. quite advanced for its day. dynamic, or performance improving As photos show the Wakefield version, it Contest Director Jim Adams reports reason for rotating a square cross- should be Old Timer legal to make these another nice day that required practi­ sectioned fuselage 45 degrees before mods to the plan if you want to fly in O.T. cally a max flight every time to win. As it adding wings, landing gear, and tail Wakefield. Check with John "Daddy was, two seconds separated the O/T surfaces, in fact it sorta complicated Warbucks” Pond. Rubber winners! With good rubber the process, but they always looked The smaller ship seems prettier to me, again available, it is no wonder we are good to me, and also, I guess, to so we’ve stuck with that original Dia­ seeing a resurgence of O/T Rubber the many modelers who created them. mond plan, just as Air Trails' Gordon interest! One of these models that caught my Light chose to do. Change it if you wish. After all that plugging for the rubber eye, that I kept going back to in my Original building instructions were very events, we would be remiss if we didn’t magazine collection, was appropriately brief, and I see no need to expand on at least show a couple of shots of good named "The Diam ond Designed by them. If you can’t build this easy one flying rubber models. Photo No. 5 is a Roy Wriston, of Tulsa, Oklahoma, it was without instructions, you shouldn't even shot taken at the SAM Champs, West- one of the more competitively successful tackle it. However, the balancing and over A.F.B., showing Mike Moskow with diamond fuselage models, and was flight adjustment technique is very well a very neatly built Henry Cole design, featured in the October 1937 issue of Air described, and is a system that is very Smoothie. This is not one of the simpler Trails. With a 29-inch long fuselage and useful for any similar model, so we'll models to build, but the streamline tapered 150 sq. in. wing, it was a terrific quote it word-for-word. types do fly very well. flying model, but was undersize for Select a very calm evening for test Photo No. 6 shows a Norseman, one of Wakefield competition. flying. A grassy field will reduce damage the series of commemorative models Roy modified the 150 Diamond to 200 lo a minimum during the first few put out by Cleveland to recognize those square inches, lengthened the fuselage treacherous trial glides. If your model countries overrun by Hitler’s legions in to 36 inches, and qualified for the 1936 shows stalling tendencies during these 1940-41. To name a few: Flemish Defi­ Wakefield contest with an O.O.S. 41 glides, move the wing backward a trifle. ance, Polish Valor, Austrian Chivalry. . . minutes, 10 seconds flight. Photos of the If it dives, move it forward. However, actually six of them. If you want to build Wakefield version described in the don’t move the wing too far away from any others, this is simplicity itself. Once article indicate that he increased the the center of gravity. While this might you have built a set of wings and tails, the center wing panel to 27 inches (18spaces produce a reasonably good glide, it is same lifting surfaces may be used for all at 1-1/2 inches each), and made un­ practically certain to cause a disastrous of the designs. You can have a lot of fun tapered outer panels with five 1-1/2- flight under power. If necessary.change flying different style models with very inch spaces, plus rounded tips three little work. inches long. The stab was the equivalent Continued on page 87 Photo No. 7 comes from England

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fLL·/' tL tJ ,m Ocr. / // 7 A ,r r* u /s .W· » /*k *s -M■'i/%***· Diamond **«/ Ά/« Käre Schanche loads ballast shot into the side o f the K ITT-193. Trap d o o r provides access.

me. (I don’t have the time or patienceto construct an adequate foam cutting machine.) The wings are built up from balsa, spruce, plywood, and fiberglass . . . all of which require no specialized machinery or skills. And the fuselage is molded fiberglass, a technique that I mastered in my second year of R/C glider building. Thirdly, and some PHOTOS BY THE AUTHOR would say most importantly, the KITT- 793 flew very well. world's top F3B models, one model Lately, I have been corresponding design in particular captured my atten­ with three gentlemen from Norway, two tion above all the others. It was the of which were in York for the WCs. As I KITT-193 flown by the Norwegian team. spent quite a lot of time talking with You may recall that I mentioned this these men about their F3B airplane, glider in my coverage of the WCs in the Hans Peter Aaser, the team manager, December Model Builder. sent me some very detailed information The reason that it captured my atten­ about the KITT-193 for which I am very tion is that first of all, it was in my opinion grateful. I am sure that you will be the most aesthetically pleasing of all the interested in it as well, so I will repro­ gliders present. Secondly, it was a glider duce it for you here. • I was fortunate enough to be able to that I had the modeling skills to dupli­ " Reverting to our talks on several attend the Fourth R/C Soaring World cate as there were no foam wing cores to occasions during the World's in York, I Championships in York last summer. As I order from my friend Mike Bame, who take pleasure in sending you the draw­ walked around admiring some of the has until recently cut all of my cores for ing and specifications for the KITT-193,

Jespersen throws Kallelanďs K U T - 193 as Aaser looks on. The KITT- Kåre Schanche shows us the graceful, sweeping lines of the KITT-193. 193 is a model that is within the intermediate builder's skills. Author thought this design was the prettiest, most conventional.

40 MODEL BUILDER Thorbjoern Jespersen worked out these two graphs to help him decide which airfoil section would be the best compromise for the three tasks of F3B flying. Inspite of a slight disadvantage in the speed task, the Eppler 193 was chosen. The E-193 was one of the most popular at York. which was flown by all members of (he 0.4 for the speed task. The Eppler 193 was used. In order to strengthen the wing Norwegian (earn. I am a bit late, but it considered the better compromise, roots during speed tasks, and also to take took quite some effort to 'wring' this even if it was less than ideal for the speed care of the very high stresses during material out of Thorbjoern jespersen, task. winch launches, a steel rod 8x12 x 900 who is the ‘chief’ designer. . . “ It has already been mentioned that mm is inserted through the fuselageand KITT-193, BY THORBJOERN JESPERSEN quite ordinary building methods were into the wings. This rod additionally acts "KITT’s design is based upon experi­ ence gained during the Worlds in Bel­ gium, 1979. At that time, the winning Austrian Dassel was the main topic in F3B circles, as it was departing from the ordinary both in size, design, and mate­ rials used. Dassel was all epoxy, glass- fiber, and Kevlar made in molds, and all models therefore identical. "A similar goal was set up for the KITT project. Designers were Thorbjoern jespersen and Ivar Kalleland, but in order to take care of the multitude of work tasks required fwo (additional) club members .. . Kjell Nysaether and Tor Cressberg . . . were asked to partici­ pate. If you take the first letter of their first names, you will get K-l-T-T. “ The fuselage mold was finished in 1980, whereupon production of fuse­ lages started, and naturally, also wings and empennage. Ordinary methods were used for the later with either spruce/balsa built-up or balsa sheeted blue foam with epoxy/glass or Solarfilm finish. Plugs for wings and elevators exist, but there was never sufficient time to make the molds. “As of today, ten prototypes have flown. Seven of these were brought to York. Six are still flying. In local compe­ titions the KITTs have done very well, usually getting very high scores. “ Coming back to the design, the Dassel was considered too small, and it was finally agreed upon a wingspan slightly less than three meters. Thorb­ joern and Ivar were also in agreement as to the usefulness of built-in stability. There is very little to gain with a small stab. The same applies to zero degrees dihedral. The use of moderate dihedral, in this case, 3-1/2 degrees, means less use of ailerons and rudder, and con­ sequently, less drag. “ With regard to aerofoil, various Eppler ‘foils were discussed, namely, the 193, 211, 374, and 205. These were compared with respect to minimum sink (Ct 0.9 to 1.1), best gliding angle (Ci 0.6 to 0.7), and sinking velocity at Ct 0.2 to

FEBRUARY 1984 41 LEFT: Daryl Butcher, of La Habra, Califor­ nia, designed and built this multi-task model totally from scratch (including airfoils). Wing's built-up structure features transition­ ing airfoil sections from root to tip. ABOVE: Airborne shot of the U4EA83. as ballast, weighing 650 grams (23 ounces). Two ballast compartments in the fuselage accept 7,600 grams of lead (56 ounces) giving a total ballast of 2,250 grams (79 ounces). The KITT is very often flown with a wing loading of 60 to 65 g/dm·’ (19 to 21 oz/ft2) in the speed task, and 50 g/dm2 (16 oz/ft2) in duration. " Ordinary ailerons are used. These are also acting as air brakes, being deflected to 60 degrees (up). This re­ quires some planning of the geometry for servo arm. bellcrank, and aileron horn. The aileron servos are mounted in the wing roots. In addition, Thorbjoern has a three-point switch to give separate trim for the various flying tasks. He also uses a transmitter which adjusts the stabilizer when the airbrakes are acti­ vated. ” SPECIFICATIONS M e tric u.s. WINCS: Span 2800 mm 110 in Root chord 240 mm 9.5 in Tip chord 180 mm 7.0 in Avg. chord 210 mm 8.3 in Area 58.8 dm* 911 in·' Aspect ra tio: 13.3 to 1 A irfo il: Eppler 193 D ih e d ra l: 3.5 degrees STABILIZER: Span 650 mm 25.6 in Root c hord 130 mm 5.1 in Tip chord 100 mm 3.9 in Avg. chord 115 mm 4.5 in Area 7.5 dm·’ 116 in> Aspect ratio: 6.2 to 1 A irfo il: NACA 0009 M om ent arm 780 mm 30 in Stabilising factor: 0.46 FIN/RUDDER: Height 210 mm 8.3 in Root chord 210 mm 8.3 in Tip chord 80 mm 3.1 in Continued on page 91

Coordinates for the Selig 1158 are available directly from Mr. Selig, whose address is in the text.

SELIG 1158

42 MODEL BUILDER ä f ä 3 3 j * y 4 j í l 3 3

Q o p i n a » By ELOY MAREZ

THE M.E.N. C-50/4 CHARGER system charger, designed to charge four From nearby Laguna Beach, Cali­ and eight-cell packs either singly or I too have had, and have used a C-50/4 fornia, a note from Jose Tellez reads: simultaneously, and is powered by 110 since soon after they became available. I "/ enjoyed your October MB column volts AC out of the wall. The Delta BC824 was favorably impressed from the begin­ and want to take advantage of your offer is designed and intended more for ning, and had my data and photos all of a copy of the L M3909 spec sheet. I am electric powered model battery ready, but this is one on which I got enclosing the SASE as you requested. charging: R/C cars being Delta’s primary scooped! The July 1980 issue of MB "If you have a minute to spare and products. It is designed to charge packs carried an excellent article by Chip know anything about the M.E.N. of from four to seven cells, and is Conklin (the "C ” of C & D) about it, in­ charger, I would appreciate a comment. powered by a 12-volt DC source. Though cluding the results of Chip's testing, he It appears to be of the same family as the they both do the job, and do it well, too was impressed. There is little need BC824 Peak Detector charger you were neither will completely replace the glowing about in your article. I have had other one in all situations. Continued on page 71 a M.E.N. charger stored for a while; I was enthused with their ads, and it is a pulse charger. I have, however, neither read nor heard from anyone who has used it, in spite of its having been on the market for several years!!! Is it a dog·' Maybe I Q 3 should not even bother putting on the connectors." No, Joe, the M.E.N. (Model Engineer­ ing of Norwalk) charger is far from being > 1/5W a dog, and I would hurry to add some ^ (TW O ) connectors and start using it. It is a pulse charger, similar to the one from Delta, however, there are some significant differences. The C-50/4, as the M.E.N. charger is designated, is basically an R/C

Suggested circuit used to light a glow plug directly from a 12-volt battery. Transistor Q-1 isa 2N3053, Q-2 and Q-3 are 2N3055s. preferably mounted on heat sinks.

Power Rec.' T ra n • o · ffiE M MEN Automatic R/C System Charger C-50/4 |io. 0665

Although it isn't new, the M.E.N. C-50/4 Here is a simple wiring diagram for an external/internal battery hookup as described in the pulse type charger for RX &TX works well. text. Plug art and spark plug are obviously not to scale!

F E B R U A R Y 1984 43 PRODUCTS IN USE

MRC Cessna Skyhawk By ELOY MAREZ . . . The Model Rectifier Corporation (MRC) Skyhawk II is a ready-to-fly scale R/C air­ plane that is well within the beginner's ability to assemble, yet has enough performance to be really FUN! When you consider that the radio is the only thing needed to complete the model, it's a real bargain!

• Involving as many different skills, Formula One engine. As a bonus to all of For the past four or five weekends, materials, and techniques as the R/C us, I’m sure that the benefits of mass we’ve had a visitor to our fields. We've hobby does, the successful builder/flyer produced RTFs eventually filter down all seen the type, definitely interested, probably enjoys more personal satisfac­ with the sale of every engine, prop, and asking questions, looking for the best tion from his avocation than does any set of wheels that goes on one. ways and means to break into R/C flying other type of hobbyist. Forthe beginner, The ready-builts have some uses for without expensive mistakes. That Satur­ though, the road to even the first step, even the most devoted stick and silk day, I came to the field with my 3/10th solo flight, can be arduous, costly, and man. They provide more relaxing and scale CAP-20 (Kavan FK-50, dual Kraft long, especially if he is advised to build carefree flying than anything you ever FM airborne). We exchanged “ Hi’s,” he his own trainer. worked on all year. You can let your asked "How much does something like Model building is a part of our hobby. friend, wife, or whoever, take a turn on that cost?" and went on down the flight As it is in itself the source of a major part the sticks without panic, and it is pure line to look at the other models and to of the fun and satisfaction, it is a skill that foolishness to put a newly repaired, or talk to their owners. should be learned, and one which I help new radio into your expensive hand- Sunday was a different story. He was my beginning friends with. But, as wrought fire-breather. Just the place for there when I unloaded the Cessna, and learning to build and then to fly can be an RTF! started right in asking questions, some time consuming, I usually recommend MRC (Model Rectifier Corporation) knowledgeable enough to show he has to a beginner that he acquire some sort has just recently introduced a new ARF been doing his homework. His interest of ready-built model to practice his with a decided advantage over many of increased measurably after the test hop, flying with, to learn about radio installa­ the others currently available. .. it is big. and most of his time at the field that day tions with, and to learn radio and engine Quite possibly, it is the largest (70.5-inch was spent close to me, he was at my operation with, while he is also building wingspan) RTF currently available. It is a elbow every flight. It was obvious he had something from a kit. This brings us to molded foam model, thus it is very found something within his reach, the RTFs, the " Ready To Fly” light. Ready to fly, it tilts the scales jat technically and financially. The Cap-20 models, with which the model industry only 6.5 pounds. Because of its light certainly wasn’t, and neither were most has made great strides during the past weight, it can fly well on a small engine, of the other planes there, which ranged few years. an Enya .35 pulls it along smartly, and is from pattern models to Quickie 500's. RTFs don’t fill every need, and the capable of flying it through all of the The Cessna was the answer; it is some­ scratch builder generally sneers at them, basic flight maneuvers, all within plain thing he can fly soon after he purchases but they have, and will continue to have, view. I like the size! the model, it flies well, and as a bonus, it a part in the scheme of things. For one I have always felt that it is important to looks realistic. thing, not every R/C flyer has the time or remember that those of us who are ASSEMBLY facilities to create the airplane of his experienced in the hobby take so much The MRC Cessna comes to you in five dreams. We come from different back­ for granted, while the beginner views major pieces; a fuselage, two wing grounds, with differences in education the whole thing as one mystery after halves, elevator, and rudder. All control and experiences, which is evident even another. I had this fact brought home to surfaces are hinged, the engine and tank within the hobby . . . not all R/Cers can me again during my first weekend with are mounted, and all control hardware, repair an R/C system or hop-up a the MRC Skyhawk. wheels, prop, muffler . . . everything is

44 MODEL BUILDER LEFT: It's whafs up front that counts! Enya .35 provides all the power neces­ sary to fly this light­ weight model realis­ tically through all basic maneuvers.

RIGHT: More than am ple ro o m exists in the fuselage for any radiosystem you may own. Cavities molded into the fuse­ lage accept average sized components.

LEFT: An ACOMS FM four-channel R/C system was used for test flying the Sky- hawk II. C ontrols used are the four nor­ mal functions, plus nose wheel steering.

RIGHT: Internal switches are always best. Here's a close- up view of the D&D Bulkhead Switch Mount as used in the Cessna. Ace R /C has •4 .„FM this part. a c o m s v

furnished except the radio. A four- The aileron servo is mounted on a side nosewheel servo connections. This last channel system is required. mount, in turn screwed onto a piece of item is another idiosyncrasy of mine, I Wing assembly consists of joining the plywood epoxied into a cutout in the use this type of fitting whenever pos­ two wing halves together, and gluing in center of the wing. sible, it provides the features I men­ two plywood subspars to two main spars As I prefer internally installed anten­ tioned, which I consider necessary (such already molded into the wing. The nas, a plastic tube was run along the as perfect alignment and low friction), vertical and horizontal tail surfaces are inside of the fuselage, from a point even but I only use them on those controls glued in, the main gear is added with with the receiver cavity back to the tail. that will not do me in if a failure occurs, four screws, and you are ready to install The antenna was threaded into this tube. not on a heavily loaded primary flight your radio. Now for the changes! Well, you don’t control. Isn’t it really too much to Even the radio installation is simpli­ build anything exactly according to the gamble your whole airplane on the fied. The fuselage contains molded plans either, do you? Actually, nothing pressure and friction fit of a 4-40 screw? cavities for the receiver, battery, and major was changed that involved either The high angle of the rudder pushrod three servos. The cavities are made for the design or integrity of the bird. I requires a ball and socket for pushrod average sized sport system components, changed only some radio installation connection for best operation; one was and with slight trimming or padding, will methods . . . I don’t use Z-bends, as acquired and installed. accommodate most R/C systems. The furnished on all the control hardware. I Now the aileron fittings. The wing airborne components are held in place know, they are simple, cheap, won’t slip comes with flexible plastic pushrods with a piece of double sided tape on the off. and are used in large quantities. already installed from the wing center bottom, a practice which I generally They also don’t align perpendicularly cutout to the aileron horns. The ususal don’t believe in, but in this case, where through the hole in the arm or horn, screw-on clevis fittings were furnished each piece press fits into a cavity and is they distort whatever you install them in, and used at the aileron horns. The supported on five sides by foam, it is and result in either a too tight, battery center connector was changed. Instead acceptable. eating fit, or a too loose, slop and of using the long Z-bend wires with The switch can be mounted onto a vibration inducing fit. I’m sure the Z- threaded ends which are intended to be piece of plywood and onto the side of bend equipped control hardware fur­ screwed into the pushrods, I used a the fuselage with enough material nished would control the airplane ac­ Goldberg Aileron Coupler (No. AC-1) in removed to allow the switch knob to ceptably, as they do many others, and a modified installation. The plastic piece protrude. I prefer internal switches, are probably adequate for slow flying was centered onto a one-inch length of away from dirt and oil, and mounted models such as this one, but I changed threaded rod, and the pushrods were mine on a piece of ply glued to the them anyway. threaded on right up to it on both sides, internal foam structure, actuated by a I changed them to thread-on clevises securely locking it in place, the set screw D&R Bulkhead Switch Mount (Ace R/C where adjustments would be required, adding one more safety. The nylon clevis No. 103L27) and a short length of 1/16 and to silver (only, please!) soldered was installed in the recommended wire. A short piece of nylon tubing was clevises where adjustment wasn’t re­ manner, and attached to the servo arm. epoxied into the fuselage side for the quired. I also used Goldberg Pushrod wire to bear in. Connectors (PC-1) at the throttle and Con tinued on page 84

F E B R U A R Y 1984 45 A LOOK AT THE K&B .67 INBOARD MARINE After nearly four years of develop­ ment and testing, the K&B .67 cubic inch (11 cc for you metric folks) is available to the big bore model boat enthusiasts. Since its introduction in late summer, the all new K&B .67 has already estab­ lished a national record in oval racing and proven itself very potent as a model marine power source. The individual who set a record using this new engine is certainly no new­ comer to model boating. Ed Fisher, who now has set over one hundred records in the North American Model Power Boat Association, slipped the K&B .67 into his Fisher Boats canard hydroplane and turned in a 1:05 clocking in the 0.9 mile oval. That just happens to be the fastest anyone has ever gone on the 0.9 mile course. Sure, you say, guys like Fisher could set records by strapping the engine to a kickboard. How does the K&B .67 work for an ordinary model boater. What Dennis Caines. NAMBA District 8 Assistant Director, with the Pay-n-Pak "Lit Buzzard" used about the guy who will never set a for testing the new K&B .67 engine. Dennis liked the engine. record? What can this engine do for him? case. W ithout a properly prepared me the package from K&B Manufactur­ Before going any further with this chassis, airframe, or hull, all engines will ing, and asked me to sign the receiving discussion on the K&B .67, I feel that it’s not perform up to their potential. The slip. You can best believe that I wasn't important to bring up a couple of other engine is no more than a facet of a going to refuse delivery! The only factors that definitely need considera­ multifaceted endeavor to make some­ problem was that I didn’t have any type tion. It is simply unrealistic to expect any thing (car, boat, or airplane) achieve of boat to use with this big engine. engine to perform miracles in a boat that some level of performance. It’s not just In order to get some type of review is not properly prepared and trimmed. the engine, folks. together, I decided to loan the K&B .67 Too often, model boaters (and possibly That I should be reviewing the K&B .67 to a good friend of mine in model other model racers, be they involved in is somewhat unusual. Large displace­ boating, Dennis Caines. Dennis has model airplanes or cars) have the mis­ ment model engines have rarely been served as commodore of the Puget taken idea that a new engine will cure all the focus of attention in my columns. It Sound Model Boat Club for two years, is the problems they have experienced came as a complete surprise to me when currently assistant director of NAMBA with their model. Such is simply not the the United Parcel delivery man handed District 8, and he is an avid model tunnel

The K&B .67 Inboard Marine comes with two carb inserts and two different angled exhaust Top view of the K&B .67 installed in Dennis extensions. Castings and machine work are of top quality. Caines' "Lit Buzzard".

46 MODEL BUILDER that was not the case. In my first heat I placed third. The boat ran well, and I was happy with that finish. I was running strong in the second heat when the boat just stopped. When I got the boat back I discovered a hole all the way through the glow plug. The stem of the plug had been blown away. I had never seen that happen before. During the last heat I ran, I managed to get forced off the race course during the mill. The boat got caught in weeds along the shoreline, and I was done. "I cannot blame my problems on the K&B .67. The one heat I finished showed me that the engine is very strong, ferry has promised to let me use the K&B .67 during the 1984 District 8 R/C Unlimited season. I’m definitely looking forward to racing my Lil Buzzard with this engine again. ” I certainly want to thank Dennis for testing out the K&B .67 in his boat. I am currently in the process of setting up a Left side view of the K&B .67 installation. deep vee using this engine for the power source. This will be the topic in a future boal racer and R/C Unlimited contes­ with my "Pay-n-Pak” Lil Buzzard. The column. I also wish to thank K&B Manu­ tant. Dennis is actually a much better throttle response was very positive and facturing for allowing me to try out their Tunnel Hull competitor than R/C Un­ quick, ferry was fishing on the lake and new engine. I just might end up running limited driver. He is a former District b came over. He was also very impressed a big bore boat this coming racing Tunnel champion, and he placed second with the performance of my boat." (I season. in 3.5 Tunnel at the 1983 NAMBA Na­ had no idea Dennis was going to run the IT AIN’T AS EASY AS IT LOOKS tionals. When it comes to racing his R/C boat that Friday evening. We just hap­ During this past racing season, I had Unlimited, Dennis is definitely a “ low pened to be fishing at the time he came the opportunity to assist a father and budget” boat racer. I don’t think Dennis down. I got skunked. My son, Paul, son team during their first attempts at has ever won an R/C Unlimited race. I caught an eight-pound salmon, jd) model boat racing. The experiences only mention this to let you readers "After a couple oftest runs, I felt good these two encountered as the season know that I didn’t give the engine to a about bringing the boat to the race on progressed made me realize how much “ hot shoe.” Dennis is a good mechanic Sunday. I wish I could report that I had and a careful driver. I knew his equip­ terrific success at the race. However, Continued on page 78 ment ran pretty well. I also knew he wouldn't "grenade” my brand new engine by doing something foolish. What follows is Dennis' report about how the K&B .67 worked in his R/C Unlimited Hydroplane. "The Tuesday before our final District 8 R/C Unlimited Hydroplane Race, ferry Dunlap called and asked if I would like to try the new K&B .67 motor in my "Lil Buzzard” scale hydroplane. As I wanted one of them anyway, I was more than happy to try it. The biggest problem I faced was that of time. I had to race the boat on Sunday, and I had to work on Saturday. That didn’t leave much time to pick up the engine, get it installed in my boat, and test the engine prior to the race. I was very pleased that the installation went very easily. It was necessary to redrill the motor mounts as the mounting holes did not align with those of the previous engine. The throttle linkage needed to be redone, and a little work needed to be done to couple the tuned pipe. That was the extent of the work required to install the engine. "I set the needle valve and idle valve according to the instructions provided with the motor. I thought the instruc­ tions were very good. It was time to head for the lake. "The motor started right up with just a bump of the starter. It was fantastic! The boat has never run better. It was defi­ nitely faster than than I had ever gone Front view of the K&B .67 installation.

FEBRUARY 1984 47 Randy Shultz, of Seattle, holds his Fancher designed Excitation II. M odel is O.S. .40 powered. Randy has graduated from begin­ ner to expert in two years. Don McClave pic. • I would like to start off this month by racer. The speed designs of the early reporting that we have doubled the CL days were not much more than an readership of this magazine. Thanks to engine on a set of wires. This speedster both of you for your support. Our goal features a 14-inch wingspan, and weighs now is to double the readership for in at 18ounces. My, my, how things have every column. In only 12 issues the changed! readership would be in excess of 8,000. WHAT'S IN A NAME (?) DEPARTMENT And after 24 issues, can you believe this In the September issue, Bill Northrop .. . the total would be over three million. in his “ Workbench” column asks the Nonsense aside, keep those letters and rhetorical questions, “ Is it control photos coming. line,orcontroline?"Additionally,“ ukie” By the way, in response to questions is a designation that is commonly used to regarding photographs, black and white label our mode of control. 3 X 5s are the best. Color photos are Some of you historians may be able to more difficult to work with, and the help here, but from what I have read of Wisniewski Team. Entries seen at Merced, larger sizes just cost more. A helpful hint ye olden days, it was first referred to as California, contest. Top model is Formula 40, regarding the accompanying caption line control and tether flying, which are bottom is Class B. K&B power, natch! information is to write it on a separate very concise descriptions. single word is made by the Sullivan sheet of paper. Do not write on the back As I understand it, the term U-Control company, referring to the braided flying side of the photo. I thank you, and the was the trademark Jim Walker used for wire that they market as Controline, editor thanks you. the control system he promoted. The though it is not a trademark. ★ ★ ★ old Berkeley company had the word Perhaps the term ukie, or U-Control, The old timey speed job in the photo­ "Controliner” on their kits and packages is not very good, as it seemed to be a graph was recently donated to the AMA of flying wire, and it appeared to be a aeromodeling museum by Vic Garner. trademark. A present day use of the Continued on page 94 The model was built and flown by the Mathews and Huth Team from Alameda, California. The engine is a McCoy .49, Business end o f Paul which put it in Class C. Back then, Class W alker's Bad News stunt machine. Intri­ C was up to .49, and Class D was up to .65. cate details are The plane successfully competed in achieved by cutting AMA and WAM contests, and also won stencils from contact its event at the 1949 nationals. The plane paper. This entry is mostly made of metal, with the fuse­ placed second at the Nationals. Don lage formed by turning aluminum on a McClave photo. lathe. It is also interesting to note the use of a single-blade propeller, which points out that the concept is anything but contemporary. Also note the size of the plane, as compared with the mouse

The C/L plane on the left is Vic Garner's .049 powered racer, and the Jet Speed fleet belonging to Bill Nusz. The ship on the left is a Hoyt smaller plane on the right is an old time .49 powered speedster. See designed Sidewinder, the other two are variations of the Super Burp. text for details. Bob Kampmann photo. Lots of noise! Mike Hazel photo. 48 MODEL BUILDER

"Is not life a hundred times too short for us to bore ourselves?"

• The above lead-in line is by Friederich And with the recent accent on FM Wilhelm Nietzsche (1844-1900). Happily, R/C, the appearance on a postage stamp This electric powered R/C Farman F 455 very few model builders even suffer of Edwin Armstrong, developer of Fre­ Moustique built by Andrew Umirtski is a fine from boredom! quency Modulation, seems quite timely. docile flier. Does this guy look pleased? "LEARJET” NOW GENERIC TERM A pleasant change from politicians! A recent Associated Press release from ANOTHER INVENTOR like the rubber powered 25-inch Megow Wichita. Kansas, has pointed out that the Both Ed Whitten and Charles O’Don­ Waco." WHICH TIES IN NICELY WITH. . . general public now considers any small nell sent us copies of an article from the civilian jet aircraft to be a "Learjet,” in New York Times dealing with the work The latest from the Glue Guru, now revealed to be none other than Leon the same way that all lightplanes used to of NASA aeronautical engineer Dale Bennett, of REALLY BIG rubber powered be considered "Piper Cubs.” In fact, Reed. Reed favors the use of models in Moth Minor fame: " . . . we are engaged Learjet now celebrates its 20th anniver­ the exploration of his ideas, which have in this hobby for reasons having nothing sary, and is currently producing some included remotely piloted vehicles, 25% of all the world’s supply of business lifting bodies, and ground control sys­ to do with the practical, and a great deal jet aicraft. All told, some 1350 of them tems for drone aircraft. He is presently to do with romance and fantasy. Thus, have been marketed; quite an accom­ working on tail actuation systems for practical advice, no matter how sound, has its limits. Is it really useful to direct plishment for the late Bill Lear’s brain­ full-size aircraft to permit controlled mountain climbers to stay with sand child, which was originally greeted with stall landings. Reed acknowledges that dunes, thereby reducing costs and extreme skepticism by the aviation he "borrowed” the idea directly from possible injuries? I think not.” community! free flight model dethermalizer tech­ ATTENTION R/C LETTER-WRITERS niques. Take a bow Carl Goldberg! (And PECK-POLYMERS A newly issued series of United States apply for a share in the royalties?) PRODUCTS PROLIFERATE 20-cent postage stamps honors inventors SERIOUS SCALE? Bob and Sandy Peck have added . .. two of whom contributed at least Frank Beatty, highly-skilled builder of numerous new items to their range. You indirectly to the radio control of models. scale models, commenting upon the may still think of them only in connec­ Foremost may have been Nikola Tesla, lengthy search for documentation for tion with small flying model kits, but be who not only invented the induction his latest project: "Sometimes I think assured their interests extend far be­ motor, but performed pioneering ex­ (know!) I had more fun when I knew less yond! periments with remotely controlled about airplanes; was less nit-picky, and Among the current offerings we find model boats. was delighted to build a simple model radio controlled blimps, tools, reference books, plans, building boards, work

aprons, T-shirts, caps, CO 2 engines, electric motors, battery chargers, and dozens of kits and accessories. If you don’t have their catalog, you’re missing a good bet. For ordering information, please see their ad elsewhere in this issue. ANOTHER NEW MUSEUM Carl Hatrak gave us a copy of the Lockheed Life newsletter, announcing the opening of a small, but significant, museum in "beautiful downtown Bur­ bank,” Lockheed’s early hometown. Part of the Burbank Historical Society, the Gordon R. Howard Museum in­ cludes many artifacts from Lockheed, such as paintings, photos and models. Located at 115 N. Lomita Avenue, the facility will operate on a part-time basis for the present, but hours will be ex­ tended as the staff increases. Eric Coates, well-known FAI scale judge, is building this magnificent, 65-inch span, Gloster PEANUT COMPUTERS? Grebe for R/C competition. The model is powered by a four-stroke Magnum engine. Yes! According to an article in the

54 MODEL BUILDER ABOVE: Linda and Shirley Stott tend John Stott's Cessna CR-3 racer during the 1983 Flying Aces Nats meet. Frank Scott photo.

RIGHT: Roger and Mireille Aime, France, prepare their Bucker Jungmann Peanut at the Flightmaster annual scale contest

business section of the Los Angeles Santos-Dumont Demoiselle. Third went queues” favored scale authenticity. Times, the newest computer from IBM is to Benno Sabel and his Goupy I, while Americans Bill Noonan, of California, code-named the "PEANUT," and is 4th was awarded to J. Weil, who flew a and Millard Wells, of Florida, sent expected to revolutionize the industry. Waterman Racer. models to be proxy flown, but both But. will it be as much fun as the flying AND IN BELGIUM encountered problems: delays in the kind? We find some of the same news postal service caused Noonan’s models GERMAN PEANUTS among the participants in the Flemall to arrive too late to participate, and the Benno Sabel reports on a recent "International Contest For Reduced Wells model, an ultralight Wee Bee, was indoor contest held in a "Hugenotten- Models of Aeroplanes.” Thanks to declared ineligible to participate in the halle” near Frankfurt. The competition Director F.L. Van FHauwaert, we have an Peanut Class because its wings were rules used were novel in several re­ account of the August, 1983 proceed­ covered only on the top side. But, in a spects: For example, the dummy pilot ings. This event was truly international, Continued on page 74 was judged along with the other scale with representation from Belgium, details, and bonus points were assigned Denmark, France, Germany, Great Bri­ for models of difficult or unusual con­ tain, Poland, Switzerland, and, by proxy, figuration. Each contestant was permit­ the U.S.A. ted four hand launched flights and two Six countries competed in class F1D takeoffs from the floor. Duration scores (microfilm); three countries in Penny from the two best hand launched flights Plane; seven countries in Easy B; four plus one ROG start were added for the countries in Sainte Formule (similar to flight score. U.S. Manhattan Cabin); and five coun­ First place winner was Siegfried tries in Peanut Scale, which attracted, by Glockner flying his FRED, as featured in far, the most entries. The Peanut cate­ Model Builder earlier in the year. (Actu­ gory was divided into two divisions: ally, it was December 7982. wrf) Glock­ "Cacahuetes Duree” placed the accent ner also gained the 2nd place, flying a on duration, while "Cacahuetes Ma-

John Oldenkamp and Cynthia Sabransky, two of the best photographers in the hobby, are Jacques Delcroix, of France, with his winning Pottier Peanuts during the international indoor equally at home on the flying field in compe­ contest at Flamalle, Belgium. Photo by F.L. Van Hauwaert. tition. Scene is Mile Square Park, California.

FE B R U A R Y 1984 55 By BOB STALICK ™ I r

stuff much, much tougher than other commercial 'miracle' plastic coverings, and I found that the clear variety was much lighter. I had used the heavier red color on the inner wing panels and stab center section, with the tips of both finished off with the light weight clear (looks like white Silkspan). The fuselage was silkspan covered, nitrate doped, and then sprayed with a thin coat of white K&B epoxy. Of course, the engine was also a little unique, hut not original, as Meredith Chamberlain had won the event with a • The more things change, the more sister engine mounted on the front of a they stay the same. As I look through the Woodpecker design at Seguin the pre­ Bob Stalick launches his C-Quell. M odel is old Nostalgia Era magazines, looking for vious year. Actually, it’s a rather simple powered by a K&B .40. Is it overpowered? potential Mystery Models, I come across hybrid which is to be credited to Mere­ Read this month's "Free Flight" concerning gas models that have 400 square inch dith for 'thinking it up.’ The ingredients the Dim Wit 535. (C-Quell is an M B plan.) wings and are powered by K&B .32 are firstly an old model OS MAX-H40 RR ings on either end. Both holes in the engines. Early 1/2A models had 150 or P from which you must extract the ends of the new rod are smaller than its squares. All of the old texts seemed to be head, the cylinder and piston, and rod predecessor, so you have to press out filled with the debate over whether to assembly. Then you must either snitch the bearing in the upper end of the new have high climbing, small models, or these similar parts from a current model rod and install it in the old rod to arrive large, underpowered floaters. Also, 05 40 MAX-H series, or obtain them at a .42 rod. There are other combos that engine runs were in the neighborhood from your favorite OS parts source. are obvious, but this one worked best of 20 seconds, maxes were five or six The purpose is to stuff the new model for me. minutes. parts into the old model case and use the A word of caution before assembling I fly Notalgia with one of two models. I old crank as well. OS shortened the the head. . . I found I had to add another have a 1/2A Spacer that’s powered by a stroke and increased the bore in bring­ OS aluminum head gasket to attain Wen-Mac Rotomatic. The climb is ing out the later model so that mixing proper piston-to-head clearance, al­ enough to really remind one of the good the old stroke with the new bore begets though Meredith did not. There are old days . . . slow and steady. The other a .42... or for our purposes. . . a class D apparently some differences in toler­ model is a RamRod 432 powered by a engine to swap with a comparable OS ances, or in the lengths of the con rods. K&B Greenhead .15. The climb is OK, MAX-H 40 or ST C 21/40 for Class C. Well, I guess that’s enough engine info not a scorcher mind you, but as long as I Neato, huh? to put you in business if you are inter­ can keep the engine running, it goes up Some minor machining is a necessity ested. fine. as the old case has to be bored out to Obviously, my Ί/2Α Lunar-Tic, the Nit Well, just as a number of us here in the accept the new cylinder sleeve. The old Wit 372, and the subject Dim Wit 535 are Northwest started talking up a D class and new rods are different on both ends, of the same family design with wing and event .. . remembering the good old so it’s multiple choice on which end or stab planforms generally proportional. days of really big models (at least 1000 which rod (old or new) upon which you Wing and stab construction differ for square inches), Harry Murphy does all of must 'operate'. The new rod is bushed varying weight to strength requirements, us in with his Dim Wit 535 . . . this on both ends, the old rod has no bush- with fuselage/pylon combos tailored to month's three-view I guess it’s time to resurrect the old discussion about high climbing, over­ powered models, vs. the floaters. FEBRUARY THREE-VIEW, THE DIM WIT 535, BY HARRY MURPHY (FROM THE CIA INFORMER) Here is the winner of the 1982 Lincoln Nats D Gas event, the Dim Wit 535. Harry describes his model as follows. "I reckon it could be said that there are a few unique items in regard to this design . . . one of which was the all up weight of 25.5 ounces. This must be considered a bit unusual for a D Gas job even for Cat. Ill competition. Also, it seemed that I possessed the only gassie at the NATS that was covered with the relatively new Coverite Micafilm. This I surmised from a general interest of other contestants Bill McDow, even though recovering from a serious knee operation, shows all of us how to who persisted in pinchingand thumping sm ile. . . and why not? He has just finished winning 1/2 A Gas at the Autumn Thrash. Model the flying surfaces. Anyhow, I found the is the Honcho, Bill's original. TD .049 powered, naturally!

56 MODEL BUILDER Nostalgia at its most nostalgic . . . a 1/2A Spacer, powered by a middling Wen Mac .049 Rotomatic. Bob Stalick holds. power/engine, weight/engine mount requirements. This has been a series stretching 12 years with some bit of success in two of the three basic sizes garnering Nats wins, and with my great­ est thrill being that of having my peers selecting the 1/2A Lunar-Tic as their 1979 NFFS Model of the Year. Thanks, fellers!” Well, Harry, I was given some “ lip” by the locals for my K&B .40 powered C- Quell (750 square inches). I would like to show up at the site with 535 square inches and a .42 engine. Thanks for the info. FEBRUARY MYSTERY MODEL I mentioned early in the column that I spend some time looking for Nostalgia Era models of the free flight variety. One of the problems with the Mystery Model is to find one that is well-known enough to be identified, but not so well-known as to be immediately recognizable. In addition, the model must have enough DARNED GOOD AIRFOIL: EPPLER 58 magazine, Vol Libre. You may even sub­ distinguishing features so that it doesn’t Over the years, I have featured three scribe to it. This is one large (40 pages or look like other designs of the same ilk. of the Eppler series of airfoils. This one so) tabloid sized newsletter/magazine. Well, I think I’ve outdone myself for follows the general trend of all of them Five issues come out every year, but this month. This one is a free flight. It in that it is laminar in nature. The 58 has a each one is jam-crammed with only free features an unusual power source . . . an rather highly "flapped” trailing edge, flight related items. The cost is 60 francs inflated balloon. It was published in a which makes it less suitable for zoom- for five issues. The editor, Andre national magazine. launch A-2 models. It should be an Schandel, claims that the object is to Now, I grant you that it’s not your run- excellent selection for Coupes, Wake­ provide the best possible coverage of of-the-mill duration model. So, I’ll bet fields, and other similar models where a free flight developments throughout that a number of you “ medium” old fast, but good gliding section is impor­ the world, together with associated sub­ timers must have built this one as a fun tant. The construction of the trailing jects of interest to free flight enthusiasts. type, spare time project. If so, you must edge might prove tricky, but if you use a Features are also included which are know the name. Maybe you even have very narrow, but hard strip of balsa or aimed at helping the young and less some stories about how yours flew. basswood, it should do the trick. experienced in the areas of design, con­ Regardless, send your best guess as to Hope you try it! struction, and flying of competition free this model’s identity to Bill Northrop, VOL LIBŘE... flight models. Contributions are solicted c/o Model Builder magazine. The first AN EXCELLENT PUBLICATION in the form of articles, plans, photo­ one in line gets a free one-year subscrip­ Over the years, if you have been fol­ graphs, reports, etc., from around the tion to the best model magazine on the lowing the free flight columns,you have world. Send to: Andre Schandel, editor, market. undoubtedly read about the French 16 Chemin de Beulenwoerth, 67000

Wayne Drake uses this launching stooge for his A-2 glider, the Cold Duck Ν α 9. The model is supported by thin rails mounted on a This close-up view of the stooge shows how wires are used to hold support that swivels to allow launch in any direction. the model on the rails prior to launch.

FEBRUARY1984 57 FROM "VOL LIBRE" HOW TO MAKE EXTRA RIGID, HIGH GLOSS WING COVERING SHEETS REINFORCED WITH GLASS CLOTH FOR FAI MODELS.

adhesion between plexiglass and resin. 2) Balsa sheet (1/20 in to 1/16 in) laminated with perfectly parallel sides sanded smooth. 3) Lightweight glass cloth soaked lightly with epoxy resin. 4) Same as item one above. Doug Hannay from British Columbia, Canada, 5) Building board or other solid surface. shows off his international tool box and his Pacific Ace rubber powered model. Rigidity of wings covered with fiberglass laminated balsa sheet is similar to that of Dural foil of 03 mm thickness. After the wing covering sheets are completed, the wings are built Strasbourg Robertsau, France. conventionally. As an example of the kind of article * Plexiglass sheet should be as wide or wider than the balsa sheet. An 80 Kg weight is ap­ that you would find in Vo/ Libre, I have plied to the plexiglass for proper impregnation of the epoxy into the balsa sheet. included a sketch of how to make extra rigid, glossy wing covering sheets which The sample I have is black and is pur­ are reinforced with fiberglass cloth for chased in 300 yard rolls for about $8. That FAI models. If I didn’t mention it, Vol Libre is pub­ should give the entire USA enough DT and VIT line to last a year. As it comes in lished principally in the French lan­ guage, but also contains articles in other rolls,it has a slight curvy set, which can languages as well . . . including English. be removed by cutting off the length needed and gliding it back and forth DT LINE MATERIAL . . . BOW STRING over a piece of rough leather until the It’s a never-ending quest. To find a DT set is gone. As it has a waxy finish, it will line (or VIT line) that doesn’t break, not get hung up on those little globs of doesn’t kink, that goes around corners, glue or dope that creep into the best of and doesn’t stretch. I may have found tubing. However, the waxy finish is not one you could find interesting. It's bow so waxy that knots cannot be permeated string. by Hot Stuff. I wish I could take credit for Bow string is what hunters use for the discovering the stuff. . . I can’t. Clarence string that fastens to the ends of their Haught was using it on his FAI Power bows (as in bow and arrow . . . Tonto. .. model at the Northwest semifinals. Must Robin Hood). It’squitethin (.050 in.),has be good . . . he placed first. a tensile strength exceeding 50 pounds, THE END and has a waxed finish. The sample I I hope you are getting your building have has near nil stretch . . . in fact, once done . . . it’s nearly time to prepare for it is "broken in” it has no stretch that I Bill Gaiser appears to be biting off the end of the first contest of the year! the DT fuse on his Wakefield model at the could discern. Thermals!!! · annual Autumn Thrash, Rock Prairie, Wash.

DARNED GOOD AIRFOIL - EPPLER 58

STATION 0 1.25 2.5 5 7.5 10 15 20 25 30 40 50 60 70 80 90 95 100

UPPER 0 1.5 2.4 3.6 4.3 5.2 6.3 7.3 7.8 & 3 8.8 8.9 8.5 7.7 6.2 3.7 2 0

LOWER 0 -0 .05 -0.05 -0.4 •0.2 0.4 0.9 1 2.2 2.7 3.5 4 4 .2 4.1 3.6 2.5 1.5 0

58 MODEL BUILDER

By FERNANDO RAMOS

• This month is kind of a "catch up" for the same price. with a listing of several new items, and Speaking of Peck-Polymers, I have just handy hints. To start off, I want to received their latest catalog. It is simply mention Bill Hannan’s new book, en­ amazing, there are 30 pages of modeling titled Scrapbook of Scale, Three-Views & goodies that will make you drool! I can Nostalgia. It covers a period of modeling remember when all they had was a between 1964 and 1983. Thereareseveral single sheet brochure with only a few articles, scale three-views, and plans, but items. They have everything you need to most of all, it is Bill Hannan. Those of you build successful flying models, including who have read Bill’s first book, Peanut building boards made of fiber. I suspect Power, will recognize his second effort Celotex, or, as I learned as a youngster, the same easy going literary style. This beaver board! They have three sizes, Mark Fineman's Seversky P-35 (Swedish EP-9). new book should be part of your model­ 12x18, 18x24, and 18x48. They range in ing library. It can be obtained from price from $5.95, $7.95,and $9.95 respec­ removed the glow plug but left the fine Peck-Polymers for a scant $8.95. In fact, tively. copper gasket in place. The conversion

Peanut Power is still available from Peck Peck is also headquarters for all CO 2 was then screwed into place. As Davis engines and accessories, and for the recommends an eight-inch prop, I outstanding Hungerford wheels. Their bolted on an 8-3 and filled up the tank. — USE PLENTY OF The first thing I found out is that the SOLDERING FLUX catalog doesn’t have a price on it, but I know that it can’t be free. . . not the way engine will “ backfire” and unscrew the e printing costs and postage are these prop if you don’t flip the prop smartly. BEND A LENGTH OF .032 MUSIC WIRE days. So, drop them a line at P.O. Box Once I "fingered" this out, the engine INTO A U-SHAPE. SOLDER TO IT A 2498, La Mesa, CA 92401. ran extremely well. Interestingly, it SHORT LENGTH OF 3/32 OD BRASS As long as I'm mentioning COz, I sounds just like all other CO 2 engines TUBING (APPROX. 1/4 IN. LONG). would like to discuss with you Bob Davis’ I’ve ever heard.

(of Davis Diesel Development) new CO2 Unfortunately, I didn’t have a larger CUT (VIEWED conversion kit for the Cox Pee Wee .020 source for CO 2 other than the seltzer FROM ABOVE) engine. My understanding is that Bob cartridges, and with the tank provided designed the unit, and Brown engines is the duration wasn’t very long. However, a brass manifold is underway that will MAKE A CUT THE ENTIRE LENGTH producing them. This has resulted in a OF THE TUBE. I USE A DREMEL CAR­ beautiful compact unit that merely takes allow several tanks to be hooked up in BIDE WHEEL FOR THIS STEP. the place of the engine’s glow plug. Take parallel for added duration. As the neat PROP ASSEMBLY: SUPER-DUPER one off, and put the other one on! little aluminum tanks do not weigh very After receiving this jewel in the mail, I much, there shouldn’t be any weight PROP HANGER immediately went out to my workshop penalty to speak of. _ .032 M.W. to try it out. Ideally, the large CChfire extinguisher I dusted off an old Pee Wee, and type tanks are the best for filling, includ-

THIS IS A SHORT LENGTH OF 1/16'· O.D. ALUM. TUBING; CRIMP ONE END WITH FINE PLIERS TO MAKE A KIND OF FLANGE. IT CAN NOW BE POPPED IN OR OUT OF THE HANGER AT WILL!

THE PROP SHAFT WIRE SNAPS INTO THE GROOVE- MOVE THE ALUM. TUBE BACK, AND THE RUBBER TENSION KEEPS THE PROP ASSEMLY IN PLACE. THE FLANGE PREVENTS THE ALUM. TUBE FROM PULLING THROUGH.

(STICK)

BIND WITH THREAD AND GLUE

60 MODEL BUILDER Mark Fineman's Earl Stahl P-39 Cobra II racer. ing the Brown engines. Naturally, these While on the subject of plans, I "Canuck.” There are two sheets (24x36) are pretty costly. Davis carries a couple recently received several plans from scaled at 3/4-inch equals one foot scale. of types that may interest you. Charles Neely. I certainly appreciate Amelia Earhart learned to fly in the I have a Flyline General Aristocrat, people who can draw plans, and Charles aircraft featured. This would make an that has been flying for years with a Pee is no exception. He has scale drawings excellent Pee Wee .020 F/F scale model. Wee, and I’m going to put the conver­ for the venerable P-51 B/C Mustang. The third drawing is a 22-inch span sion on that and give it a try. I’ll keep you These are excellent drawings of this Travel Air 2000, with accurate scale posted on that one. aircraft, and are the result of many years outlines, ideal for CO2 . The last drawing By the way, Davis has a neat pin vise spent in research. They are primarily is a nifty 13-inch span profile model of an that contains aset of small drill bits in the reference drawings, but I can see a Ercoupe. handle. I bought one and I’m quite beautiful rubber model built from them All of Charles’ plans are first rate, and satisfied with it. The price for the com­ using the scale outlines and the cross- I’m certain you would want to include plete set is $10.00. For further informa­ sections provided. There are four large them in your plan file. Send Charles tion write to: David Diesel Development sheets in the set. Inc., P.O. Box 141, Milford, CT 06460. Another excellent plan is the )N-4 Continued on page 76 Davis Diesel Development has been drawing model plans for quite some time now, and its latest efforts should Davis Diesel appeal to most all of you rubber scale D evelopm ent has fans. One is the Bloch MB-152 in both these handy pin vise Peanut Scale and Walnut Scale. This was sets with drill bits a WW-II French fighter with a radial for drilling small holes in tight places. engine. The other is the North American 0-47. This was a pre WW-II observation aircraft, and a real classic. This model is drawn at 1/24-scale and has a 23-1/8 inch wing span. It is a real beauty. Incidently, Planes of Fame, at Chino, California, had a flying 0-47. (Notice the use of the word had.) Thev had flown it to Porterville, California, to a fly-in. The pilot landed it with the gear up (pilot error), it caught fire, and was demolished. Porterville has no firefighting equipment. If it had, this machine could have been saved. This was a sad ending to a great flying machine. Dave presently has more than 30 model planes available, priced from $1.50 to $4.00, which is reasonable indeed. Most average two bucks a piece. You can’t beat that. He also has an enlargement service for those of you who can’t (or won't) blow up plans. To find out more, send Dave a self-ad- dressed, stamped envelope for his No. 8 catalog sheet. His address is: David Diesels, P.O. Box 101, Woodville, OH 43469.

FEBR U A R Y 1984 61 NORTHWOOD UPDATE be torn down or made unavailable for Latest word from Stan Chilton is that model flying forever. It would be super the Northwood Institute building at if the building was restored to its original West Baden has been sold. Very little condition as a luxury hotel or conven­ else is lor publication at this time. We all tion center, and could still be available hope there's still a chance of using the as THE indoor site for modeling. This building for indoor competitions in the mecca is centrally located to most areas future. This building has been the site of of the country, and it is so ideal because many indoor contests in the past few the sleeping rooms and restaurant are all years, and it was considered the ideal under one roof. This month's plan is the Honey B indoor dur­ room for duration models such as: FAI Other areas of the United States are ation model (Easy B class). It has flown 21 Microfilm, Paper Stick, Pennyplane, Easy under consideration as alternative sites minutes and has set a record for this class. B duration as well as Peanut and full-size for national indoor meets. Santa Ana, Indoor Scale and Hand Launch Gliders. California, is one area being reviewed. and housing facilities in the area would The last national indoor meet was held The ceiling height is one of the best in be scattered and more expensive. The at West Baden in July, and the last team the country (about 140 feet to the travel time and distance from Florida selection trials in September. It was catwalk). Obtaining the room for more and the east coast would be prohibitive. feared at that time that the facility might than one day at a time is questionable. The Wingfoot Lake Hangar near Ak­ ron, Ohio is another choice. Availability for more than one day is doubtful. The location to all areas is good. The ceiling height is good. Your indoor editor set the first of several indoor flapper records in this room in 1968. Housing is ques­ tionable. Former U.S. Indoor Team member Bill Hulbert has been the contact for this building. The other possibility is the Kibbee Feildhouse at Moscow, Idaho. Ceiling height is good. Locality is not so good. We here in California are closer to this site than most of the indoor flyers who might attend a multiple-day contest at Moscow. The travel time for us would be considerable. Being tucked up in the northwest corner of the country seems to dampen enthusiasm for thisotherwise excellent room. Let's face it. West Baden is by far the most centrally located and ideal indoor building in the U.S. Keep your fingers crossed that the new owner will see fit to allow us the privilege of continuing to fly our exotic Looking back through the world's largest indoor model, the Howard Hughes Spruce Goose. little creations in the atrium at West The wax figures are life-size. Don't miss this aircraft if you are ever in Long Beach, California. Baden.

Bottom side of the Spruce Goose stabilizer shows the sag of the skin. The stab (left) and the towering vertical tail of the Goose. As pointed Author noted that the wing covering sagged even worse. This was out in the text, rudder travel is quite limited, but apparently adequate. considered normal by the attendants at the display. Johnson pic. Photo by author.

62 MODEL BUILDER Young Darryl Stevens, at 20 years, has joined the 30 minute club Mr Bob Gibbs, of San Francisco area, prepares his m icrofilm model while flying in the blimp hangars in Santa Ana. Mr. Stevens holds for launch at the FAI Indoor Trials. Note helicopter in the back­ indoor and outdoor hand launch glider records. ground . .. wonder if any models landed up there? Speaking of flying sites, Stan Chilton carefully, and select your wood well, leading military ship builder during relates that he has to fly his models in a hold down the weight, and cover nicely, World War 11. As the project took shape, 17-foot high building in Wichita, Kansas. you will come out on top. If you are just a the HK-1 (Hughes/Kaiser 1) became the He sometimes drives to the Boys Ranch casual builder, don’t try this model. This H-1. Kaiser knew nothing about air­ at Bedford, Texas, to fly. The 350-mile aircraft is only for modelers who want to planes, so Hughes took over the entire drive is rather far considering that the win contests. Pay great attention to the task. low ceiling at Bedford requires frequent construction of the propeller. I cannot After Mr. Hughes' death, the 33 year pole steering. impress upon you strongly enough the old plane was towed into Long Beach “ My hometown site is only twice as importance of having a good prop on Harbor and lifted onto a temporary land high as my living room!” Stan says. We in your model. If you don’t nave an excel­ perch nearbv. L.A. complain about having to drive one lent propeller, don’t expect excellent We drove to Long Beach to get a hour to fly indoors. I think we are pretty times. close-up view of the plane. After parking lucky. How’s the travel time from home My thanks to Stan Chilton for allowing the car, we walked down a dirt road with to flying site in your area? me to present this model to you. And the big tail fin in sight. Halfway there, an HONEY B CATEGORY II MODEL don’t forget, seek out the very lightest armed guard appeared in the road and Last June 16th at West Baden, the condenser paper available for the cover­ warned us to go back. I didn’t argue with above mentioned Stan Chilton set the ing. It will make a considerable differ­ this rifle totin' fellow. We drove away Category III record in Easy B with his ence in your flight times. Let me know disappointed. Honey B model. The record time was 22 how your Honey B performs. Later, during the construction of the minutes, 01 second. A very excellent I plan to build the Honey B very soon, dome over the seaplane, we tried again. time for this class of model. Stan has long ana will report to you on how my We stopped at a guard shack and tried to been known for his great flying Easy B Chilton model flies. impress the attendant with our impor­ ships. The extra effort he puts into TALK ABOUT BIG! tance. After several phone calls in our designing and building these little gems Recently, my son Chris and I got in to behalf, we were again turned away. is very evident. Each year at the atrium see the world’s largest indoor model. Undaunted, I went over the the Queen Mr. Chilton has been right up there with I’m referring, of course, to the famed Mary Hotel (nearby) and called some the highest times and the smoothest Spruce Goose. contacts to gain entry to view the bird. flying "B’s." To set the record straight, the Goose No luck! The plan of the month, this time is the was originally dubbed the HK-1. It was Later on, during a time when it looked Honey B. I recommend this as an out­ felt that a shipbuilder and an aeronauti­ like I might get a spot on “ That’s Incred­ standing Easy B model. You may see cal designer were needed to dream up ible” with my ornithopters, I suggested some heads turn when they announce the troup-carrying behemoth. So the filming them in the dome flying over the your winning time at the next indoor contract wasawarded to Howard Hughes Goose, hoping that finally we might get contest. I expect that if you build it very and Henry Kaiser. Mr. Kaiser was a to see the H-1. The deal fell through, and

Clarence Mather, of San Diego, Calif., built this FAI mic ship, and was Millard Wells, of Florida, built this twin rotor autogyro. This is an preparing for a flight at the blimp hangar in Santa Ana, Calif. Note the ambitious project for any indoor modeler. Millard is one of the the fine workmanship displayed in this duration model. Johnson pic. better scale modelers in the Miami area. Bob Andrews pic.

FEBR U A R Y 1984 63 I gave up hope. attendant stated that this is normal. This It looked insufficient to me. Look at the About one month ago, we did get in to condition is more pronounced on the photo and see how it looks to you. see the bird. We payed our $6.00 like flying boat than on any other aircraft The steel dome that houses the plane every other tourist, and in we went. surface this writer has seen. The other is large enough at ground level to allow Believe me, it was worth all the trouble. thing I noticed was the very close for many exhibits relating to Mt. Hughes It isfantasticineveryway! Ifyoucometo tolerance of the vertical fin to the and to the aircraft itself. The construction California, don't miss the Goose. elevator. The Goose photos show' just and assembly phases of the Goose are We came away with several observa­ how little the rudder was allowed to depicted, and other various aircraft tions. The skin on the wings and stabil­ travel from side to side. The attendant triumphs of the designer are displayed izer seems to be buckling. A definite related that this 16 degrees of travel was as well as a full-size model of the Hughes sagging of the skin was apparent. An quite adequate to steer the giant plane. Racer. A restaurant, souvenir shop, and restroom facilities are included. A ring La rry C ailliau has of colored lights, halfway up the inside been called the best of the dome's wall goes on and off slowly FAI flier on the west which changes the color of the plane coast for the year from white to red, then blue, and back 1983. Larry consis­ te n tly had tim es in to white. The H-1 sits on a beamed the 38 to 39 minute framework several feet over a lagoon range (under a 100- which reflects its image in the water. foot ceiling). He also The line to board the plane is quite took first place in long. A very lifelike wax figure of pilot M icrofilm at West Hughes can be seen as visitors climb the Baden last June. stairs and enter the fuselage through a ten-foot square opening cut into the body. Once inside, the viewer makes a horseshoe turn and exits after looking back through the immense fuselage. As Chris and I left the building, I wondered how it would be to hold an indoor contest in the dome. The big

64 MODEL BUILDER LEFT: FAI team member, Cezar Banks, of San Diego, Calif., was second at the US Indoor Team Selection Trials at West Baden in Sep­ tember. 1983.

RIGHT: Earl Hoffman flies his FAI duration model. Earl's models often turn out underweight. Earl is famous for his Easy B record of 24 minutes. The prop was built-up and covered with very thin sheet wood.

Hubs of 1/8 sq. hard balsa can be The heavier the model, the faster it will fashioned with 45° angles cut at each fly. problem would be how to retrieve the end. Then different blades can be I would like to repeat something that models from atop the giant stabilizer. quickly cemented into place without was mentioned in a previous column. If Access to the top of the wings is no changing the entire prop assembly. The your model touches down with no problem, but the stab; now, that’s 1/8-inch hubs can be about 3/4 of an winds left (dead stick) the motor is too another thing. Well, I guess we will inch long for Grapenut models and short. The plane should power up and never know tne thrill of flying our little slightly longer for Peanuts. Soak the power down. Ideally, the rubber band models in the room with this biggest of sheet plywood in warm water for a few should have one row of knots left in it indoor models. minutes, and tape the precut blade when the flight is over. If it has more PLYWOOD PROPS around a small can and bake in a 300 than one row, cut off about one inch and What type of props are you using on degree oven for about a half hour. retie the knot and try it again. your indoor Peanut and Grapenut Remember to angle the blade at 15 How much rubber lube should you models? Most likely they are the plastic degrees off vertical to get the right pitch use on a Peanut? Very little is my rule of type. Well, the word is out that some of angle. thumb. A dry motor will break sooner, these props are not being manufactured These plywood wonders can bang but a motor that has too much lube will now. against the walls all day without break­ spatter the inside of the fuselage and Have you considered using propellers ing. The glue joints may break but the weaken the wood structure. I place the made of 1/64 of 1/32 sheet plywood? blades will not. The blades can be fine rubber motor in my hand in a ball and They work well. Balsa indoor props are sanded and the edges rounded smooth squeeze out one or two drops onto the all this author uses, but some modelers before spraying with a light coat of motor. Then, I rub the motor between are afraid to try balsa because it is enamel. Of course, this type of propeller both hands and remove the excess lube somewhat fragile. Sure, I break a lot of functions best on a lightly built model. from my hands and the rubber knot. prop blades when my models fly into the walls. When flying in small rooms like gymnasiums this is unavoidable. Perhaps an open window will blow the little model into the far wall or the trim may have changed after the model was stored in a warm garage. A crash will definitely change the way it turns. Bang! Into the wall it goes. Most of my balsa props break near the hub where the wood is the thinnest in cross section. As a quick fix, a small amount of Testors green label cement can be applied to the break, and the two joined parts are soon dry and ready to fly. You may have noticed that models using plastic propellers tend to be nose heavy. Not good. The limited area and the shallow pitch on this type of blade will bring tne model down with less So t/iereflwoti, seconds on the clock, and the airplane r will fly faster. Not my kind of flying. 'tÁťúw/i t/tú d&ůwldzkď Perhaps a compromise is the plywood JjJimihete lutfemodétplcwes Ifuzzed bladed prop. You can make any area and pitch you choose, and still have a rather poutme... í&oy, did& sphatte?1 th e#?/ light finished product. FEBR U A R Y 1984 65 shake violently during cruise and 10 A.M. - 6 P.M. 10 A.M. - 5 P.M. descent. The rubber can even shift and SATURDAY SUNDAY cause the center of gravity to move aft o i g i s » . and make the airplane stall. One way to remedy this is to braid the motor. Outdoor modelers have been using this technique for years, and it works well. Why not use it with Indoor Scale and Peanut? Braiding only works when you use an even number of loops in the rubber. For instance: two loops or four or eight, but 1984 1984 not five or seven. If your model flies on one loop of 1/8-inch rubber, then use two loops of 1/16 instead and braid it. Figure the motor twice as long as you need it. Drop the knot end over a peg or NORTHWEST MODEL a friend’s finger. Then wind the motor backwards for about 50 or so turns. Then fold the rubber over in half while it is still wound backwards, and let it wind up into a corkscrew. Insert the motor into EXPOSITION the fuselage with a loading stick (or a motor loader, as one friend calls it), and WESTERN WASHINGTON FAIRGROUNDS you are all set. The motor should be PUYALLUP. WASHINGTON snug. If it is too tight a fit, remove the Manufacturers' Displays-Demonstrations rubber and take out some of theturns in Model Displays-Demonstrations the braiding. If it is too loose, add braided turns. Admission-Adults $2.00 ea, Children 6-12 $1.00 ea. with adult. It is recommended that you remove the braided motor after each flying BOATS-AIRCRAFT-HELICOPTERS-CARS session and take the turns out of it. RAILROADS WORD FROM GEORGIA If any of you indoor builders live in or are visiting the Atlanta, Georgia, area and want to take part in the activities, Manufacturers' Reps. · Experts · Nats Reps. contact Norm Purdy (404) 428-1390 for dates and locations. The local free flight Latest R/C-Engines-Accessories-Kits-Tools club is The Thermal Thumbers of Metro Atlanta. (In the Chattanooga,Tennessee, BEST OF SHOW TROPHY area, contact Russ Timmons at (615) • · SPECTATORS CHOICE · · 886-5117.) The Atlanta group is flying indoor at the Garrett Middle School in 1ST THRU 3RD PLACE TROPHIES Austell, Georgia. To be awarded to best enteries in each category INDOOR TEAM SELECTION FOOD · BEVERAGES · ACCOMMODATIONS The scene was the West Baden, Indi­ R.V. PARKING AND FACILITIES · AMPLE AUTOMOBILE PARKING ana, atrium, and the event was the U.S. • QUICK ACCESS FROM FREEWAYS · indoor team selection trials. Bob Ran­ dolph of Loma Linda, California, totalled THE LARGEST MODEL EXPOSITION EVER HELD 1109 points to lead the indoor flyers. IN THE PACIFIC NORTHWEST Bob had flights of 36:48 and 37:30. In at the 8th largest fair in the U.S.A. second place was another Californian; A FANTASTIC DISPLAY OF ALL TYPES OF MODELS Cezar Banks, with flight of 37:08 and FROM PEANUT SCALE TO GIANT SCALE 36:39. In third was Jim Richmond with a total of 1099 points. Fourth place went to i } Larry Cailliau who totalled 1059 points. Sfux*t4aneci 6y tic 7Ht. OUiUen. @ S&cicfy We offer congratulations to these fine indoor duration flyers. This event took place over the Labor Day Weekend, September 3 through 5, 1983. EVERYTHING’S GOING UP $5.00 and up. Tony Italiano of the National Free Last time we ventured into the local If we had been buying supplies and Flight Society has been busy lately hobby shop and purchased our list of kits at today’s prices, we could not have conducting a survey by mail on an needed supplies, I thought back to the afforded to build model airplanes. alternative to West Baden. If you would prices of wood, cement, etc., some years Surely, there are youngsters out there, like to know more about this, contact ago. Only 10 years ago a small tube of even today, who come up short at the Tony by writing to: 1655 Revere Dr., Testors green label cement was 15

66 MODEL BUILDER take an 8-4 prop for better climb out (but such as the Keller, Ceist, and Astro 15, shorter motor run). Physically, the major 25, and 40 systems. I really like variable differences between the new and old rate chargers because I can tailor the ZENOAH 05s is: (1) the new motors have bigger charge to any size of battery pack, and I and better commutators and brushes; can shorten the charge time if I wish (by G-38 QUARTZ (2) the new motors are 1/4-inch longer using digital monitoring). The Astro than the old; and (3) the new motors are variable charger I have has proven to be one ounce heavier. very durable, and has withstood many The new 05XL has a front ball bearing, charges at six amps, a tough test. and the system retails for $65 (No. New items that will be out by the time 6005A). The motor alone is $28 (No. this column is printed include super 6105A). The system is also available with flexible wire like the Craupner wire sold a plain bearing motor for $55 (No. by Wilshire Model Center, new gear 2007A), or the motor alone for $18 (No. boxes with all steel gears for long life, 2107A). and red Sanyo 800 mah cells for the small These prices look reasonable, and the models that use the 020 and 035 systems. advantage of a motor that swings a The 800 mah Sanyos offer more rpm and bigger prop is that it is more efficient for duration than the GE cells that up till slower flying planes compared to a high now have been supplied with the 020 revving small prop. This means that and 035 systems. I have heard rumors of gliders, old timers, and sport planes will nearly a thousand rpm increase! That climb better and fly better. This is the would be a real kick in the pants! The type of plane that I generally fly, and I 020 and 035 planes do fly well, and this have always favored a larger, slower would make them even better. I have a G-38-2.28-38cc prop. In fact, one of the drawbacks for pack of 800 mah Sanyos, but have not Magneto ignition. Smooth running - most 05s has been that they were de­ had a chance to test them yet, so hope­ more powerful and best of all easiest signed for six-inch props and high revs, fully I’ll know soon how much dif­ starting. Light and compact. High good for fast planes. This is changing, ference they make. quality. Inexpensive. and I am glad to see other options. Last but not least, Bob sent some Retail...... $149.95 By the way, the same motor on seven technical tips that are much appreciated. Dealers: write for more information. cells is “ hot,” so if you like the higher Astro has switched to the smaller Molex revs, order it as the Astro 075XL package plugs, so the photos I showed in earlier (513) 793-5900 which has seven cells (No. 6007, $70), columns are now outdated. However, and do your stuff! The Astro literature Bob has seen some problems with the WORLD says it will turn a 7-4 at 12,000 rpm, lots of smaller Deans plugs, which is why Astro power. doesn’t use them. First, the Deans are ENGINES Bob impressed me with all the tech­ easy to plug in with reverse polarity, so 8960 Rossash Ave., Cincinnati, Ohio 45236 nical information on what Astro does to batteries can get shorted or reversed the new line of super ferrite motors, so charged. The other problem is that the here goes! Astro now has its own mag- charger plug has to be the male plug, erformance. The solution was a careful netizer, which puts out 10,000 gauss and and that means exposed pins (the Molex Calance of pig tail length and spring 10,000 oersteds, which thoroughly sat­ is covered). If these pins contact bare strength. Subtle, who would have urates the new M-8 magnets. The mag- metal they will short, and zap, there goes thought it! It just goes to show that netizer has 4000 turns of wire over a mile the charger resistor. Bob recommends Murphy’s Law (whatever can go wrong, long, and eats 15-amps from a 110-volt sticking the pins into an eraser when not will go wrong) is as valid as ever. line, about 1200-watts (1-1/2 horse­ in use to avoid this. Speaking of Edison, and MacCready, power), so it is a real brute. Bob ruined a I use Dean pins, and occasionally I there are some young inventors around quartz watch (not a mechanical watch) have reversed them, but so far with no too! Shawn Theiss, 10-1/2 years old, while working with it, and is getting four disasters. I color code one side of the pin taught his dad (an experienced modeler) percent more magnetic strength into with red or yellow vinyl tape stuck to the how to pioneer solar electric free flight. the magnets than the commercial outfit flat side of the pin block, so that it is Shawn had been given a solar powered where the motors were sent previously. pretty obvious when the plugs are toy consisting of a solar cell and a motor Anyway, I just got a super ferrite Astro matched up (i.e., red-to-red or black-to- with a prop, not much for the price that 15, and it is beautiful with its gold black). So far, I have not shorted a was paid. Then Shawn asked his dad to anodized case. It looks like a cobalt charger pin. You might consider sliding get him some 1/16 sheet balsa so he motor, but is larger because of the a section of light plastic tubing around could build a solar powered plane! His ferrite magnets, and it uses the same the charger plug that is wide enough to dad assured him that it couldn’t be silver graphite brushes as the cobalt allow the plugs to mate, but longenough done, but Shawn went ahead, he light­ motors. This is a great improvement over so the pins cannot touch metal (that is, a ened the solar cell by removing the the older line of ferrite motors, and I’m modification of the Molex idea). heavy plastic case around it,and installed looking forward to flying mine in my Bob has been testing brush systems for a rubber power, six-inch prop from a float plane. I haven’t done any tests yet, six months, and has come up with new Comet Meteor kit. It took Shawn less but Astro says it will turn a 7-4 at 15,500 brushes that last much longer for the than two hours to build the plane, and rpm on twelve Sanyo sub-C cells. The cobalt 05: 150 hours of operation or then test it from the bedroom balcony. motor is $60, part number 6115. If the better. Bob says brush design is some­ To the astonishment of his dad, it flew! workmanship is any indication, this thing of a black art, and not well under­ Though it doesn't climb, in the midday should be a winner. stood. Much of it was sweat and try, as Florida sun it just keeps going on and on Bob has been busy at Astro Flight, to Edison said, “ Ninety-nine percent pers­ and on . . . Dad says he guesses he’ll say the least. He has a bunch of new piration, one percent inspiration!” never learn! Actually, he plans to build products out besides the super ferrite Apparently what has been happening one himself. motors. The big news is an improvement is that vibration in the motor has been Would you like to build one? The on the variable rate, rapid charger. It just enough, especially in the belt drive drawing that R.J. Theiss sent should give now can charge two battery packs at and gear drive systems, to cause the you a place to start. The wings and tail once, up to 14 cells total, up to sub-C brush pig tails to swing and touch the surfaces are 1/16sheet (flat bottom). The size. The price is $49.95, part No. 4005D. loading springs. This snorts across the fuselage is 1/8 sheet. The wing and This is really a handy item for those of us springs, which heat and lose their stabilizer are zero-zero from looking at who have larger systems than the 05s, "spring," and the motor goes blah in its the photos, with lots of up elevator. The FEBRUARY 1984 67 W ATER SKIPPER 33 LOng FEATURES

• Designed for .40 engine & 2 ch. R/C • All-aluminum chassis • Planes at 1/2 throttle opening • Great speed & maneuverability • For the hobbyist who is handy with plans, drills & saws, and wants something different • Could be converted into a car

$175 00 PLUS $5.00 SHIPPING COLO. RESIDENTS ADD 5% TAX DL Products Corp. p.o. B o x s Does not include engine, engine mount, tuel tank. R/C system, waterproof radio WHEAT RIDGE, CO 80034 box or wheels

The heat was a problem, but a lot of Indeed, it would be an understatement Go with Peclr in 84 good flying went on. to say this was clearly the finest 1/2A The Udet Flamingo biplane by Heinz engine to date. Obviously, it had rear Koerner is very attractive (and so is the induction, reed-valve, carburetion. girl!), this one flies with a Keller 50/24 SL It was also the first .049 specifically cobalt motor, with twenty sub-C cells designed for beam mounting. Compe­ and an 11-7 prop. It weighs 7-1/2 lbs.; tition oriented modelers soon recog­ BUSY PEOPLE KITS Heinz is very pleased with it, and reports nized its potential. It became THE 1/2A that it flies well. ENGINE. It was indeed powerful for its YOU HAVE TIME TO BUILD THESE John Grigg (AMA president) had the time, it only weighed 1.3 ounces, and it most dramatic climb out of the meet cost only $6.98. with his 50/24 boosted Gemini. Guys, as I said in the opening para­ There were electric seminars both graph, this may be a bit nostalgic . . . days, and the interest in these was But remember, even a recent car buff CITABRIA STINSON L5 tremendous. convert would be nostalgic about '55 The best looking plane award went Chevies .. . much less Model T Fords. to Austin Gutman and Elis Grumer So, there’s some sort of precedent for a (separate awards each day); the most few words about 1959 Cox engines. I aerobatic plane award went to Bob don’t intend to make this an engine CESSNA ZLIN 50L Peiser on both days; and the longest collector column, but maybe some flight award went to Charles Hampton months hence, another similar article 16 INCH PROFILE ALL BALSA FLYER and Brad Baylor. The most unusual plane may appear. I’d like to hear what you O N LY S 6.95 award went to Nelson Whitman. Bob think about it. Good, bad or indifferent? DELUXE PREFAB KIT INCLUDES: didn't say why, but I’ll bet it was original, More technical? Less technical? None of PLASTIC PROP and BEARING as Nelson designs his own electric the above? DIE-CUT BALSA · DECAL SHEET seaplanes. For now, guys, take care... · FORMED LANDING GEAR Thanks for the info. Bob. LIGHT WEIGHT WHEELS By the way, for us west coasters, the SANDPAPER . 3-VIEW Astro contest will tentatively be in the Scale Rally ... .Continued from page 20 WEIGHTS FOR BALANCING first week in February in Los Angeles. CORRECT SIZE RUBBER MOTOR This will be two days, and last year was the case, however, and it should not be CONSTRUCTION PLANS and PHOTOS the best ever, so this year should be construed as a "BIG Bird” event. It's a BLDG, and FLYING INSTRUCTIONS great. This is the electric meet to go to scale event, be they big or little. RUBBER POWER · CATALOG $1.50 for maximum variety and inventiveness, The weather cooperated w ith the plus state of the art developments. See Flying Dutchmen this year, and although 'p -p ) PecÅt-Po/ymers0, åj you there! · the gusty winds on Saturday made it BOX 2498 MB LA MESA, CA 92041 J difficult to fly the smaller models (my Sig Citabria kept flipping over on it’s back Fuel Lines... Continued from page 21 by itself!), Sunday’s sunny skies, cool wheels are from a North Pacific rubber temperatures, and calmer breezes kept power plane. The solar unit came from a photographs can be a bit deceiving. The most of the crowd captured at the site gift shop at Cape Canaveral, and the Space Hopper appears to be the same until late into the afternoon. brand is unknown. However. Radio approximate size as the Sportsman and The hosts d id n ’t forget about the Shack has a similar kit, number 277-1201, Olympic. In fact, it looks quite a bit like Saturday evening activities either. What’s for $9.95. It looks interesting, maybe I either one. Why? Simply because of more appropriate in “ corn country” should try it, though now with the photographic enlargement or presenta­ than a corn roast? The day’s activities winter sun. it might not sustain flight. tion. You'll appreciate the size differ­ were followed by a video presentation Congratulations, Shawn, for your ence if you compare the needle valve of those same activities on a six-foot ingenuity! Shawn has been building assembly sizes of the engines. So much outdoor screen! This was followed by an flying models for three years, and 90% for photographs without an accompany­ exclusive screening of the popular are his own design without the benefit ing scale reference. movie "Airplane II” !! of plans. It looks like we have another The Space Hopper was the most It’s a weekend intended to be fun and Paul MacCready coming up! powerful 1/2A engine for the next relaxing for all who attend, and it hits its I did get some more news about the several years. The design reflected mark. Under the able chairmanship of KRC meet from Bob Kopski. It pulled 33 improvements based upon the years of Steve Gray (pilot and co-builder of the fliers both days, an increase of 11 times Cox experience with the earlier .049 famous Canadian Spruce Goose model), over the first KRC meet in 1980. Great! Space Bug and Thermal Hopperengines. it’s well organized, well attended, and

68 MODEL BUILDER most of all, safely run. They even pro­ vided fire extinguishers and 24-volt starters in the starting boxes! If you’re like me, and once in a while you want to get away from the heavy competition, and enjoy yourself in a DU-BRO scale atmosphere, try the Kitchner- Waterloo Scale Rally; you may find it habit forming! · FUEL TANKS Choppers .... Continued from page 31 centered over the skids, I place a brick or two on each side of the plywood. This effectively pins the ship to the ground during initial run-up. (See photo.) Keep in mind that this is without training gear. With training gear you may be able to place weights directly on top of the training gear to hold the helicopter down. The photo shows another good way to set up for initial run-up. Steve has included a photo of his group’s run-up area, complete with table and a wire cage. This surely adds to safety, and keeps everybody clear should a me­ chanical part fail, or if radio noise runs the helicopter to full throttle. While Steve’s way is surely the best for safety, and my way is the most practical for day-to-day operation, there is a better way yet. In both of the above cases, their is one major problem. And that is that the helicopter is in ground effect all the time. While this is not critical for tracking blades, it becomes a distinct factor when running the ship at full throttle, full pitch, to set top end engine perfor­ r mance. CAP FITS OVER- MACHINEO SMOOTH NECK OF Let me explain. Under flying condi­ TANK PREVENTS TANK tions, the helicopter is able to climb at FROM SPLITTING FORMS A full throttle, allowing the disk to displace POSITIVE LEAKPROOF SEAL air below it. This effectively “ unloads” the disk while running at full throttle, when the helicopter is tied to the ground, or strapped to a table, this large surface keeps the ship in ground effect, PROTRUDING FRONT and this will bog down the rotor speed PROTECTS FUEL LINES FROM EXTRA LONG CONNECTION because there is nowhere for the dis­ BEING CRIMPED TUBE ON CLUNK FUEL PICK UP placed air to go except out. laterally. For most accurate top end settings, the helicopter is best off at five to six feet off the ground, and strapped to an area no The DU-BRO FUEL TANKS come complete with all tank larger than the skids length and width. hardware, soft brass tubing and positive flow clunk fuel The easiest way to do this is to have pick-up Available in 8 sizes from 2 oz to 16 oz capacity someone else hold the helicopter above his head after the initial strapped-down CAT DESCRIPTION PRICE checks have proven OK. While he holds, NO you can tweak the needle valve and 402 (S-21 2 oz SOUARE FUEL TANK 2.15 pitch for best performance. However, 404 |S -4 ) 4 OZ s q u a r e f u e l t a n k 2.35 this can be very dangerous, and I won’t 406 lS - 6) 6 oz SQUARE FUEL TANK 2.45 personally recommend that you do it 408 1S -81 8 oz SQUARE FUEL TANK 2.55 410 r S - 101 10 OZ S O U A R E F U E L T A N K 2.65 this way. It's easy, but not necessarily 412 (S-12) 12 OZ SQUARE FUEL TANK 2.80 safe. 414 iS-14) 14 oz SQUARE FUEL TANK 3.00 Taking safety's sake into account, the 416 iS -16) 16 oz SOUARE FUEL TANK 3.25 cleanest setup is to use an old tire filled with cement, and a five-foot to six-foot — pipe sticking up from the center. The ______pipe should be one and a half to two inches in diameter, with the top inch or two threaded. It is then a simple matter to buy a flange fitting at the local DU-BRO PRODUCTS hardware store, and screw an appropri­ 480 Bonner Road, Wauconda, ILL. 60084 ately sized piece of wood to the flange.

F E B R U A R Y 1984 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 69 landing gear (or training gear in this P.A.W. DIESELS case). England's Finest TRIMMING THE LANDING GEAR .049 to .29. New low low prices. To be perfectly honest with you. this is Send $1.00 forlist. one of the finer points of trimming, and very few people “ trim the gear.” For two Eric Clutton, RT4, Box 1109C, reasons, I suppose: (1) It is a fine point as Edmond, Oklahoma 73034 I mentioned, and (2) few people really understand how to do it! At least I’ll normal. Always keep in mind that we’re explain how it's done, and then let you trying to trim for in the air, not on the decide whether or not to do it. ground. This is another good example where If you can bring the throttle up very the “ Kiwi” novice who needs it the most slowly to where the helicopter just is least capable of trim m ing it out. breaks ground by an inch (if that), and Hovering novices, intermediates, and the nose still stays straight, you are very experts nave no real problem if the gear close with tail rotor trim. isn’t trimmed because they can automa­ RIGHT-LEFT CYCLE tically compensate at the instant liftoff Things can start to get a little tricky occurs. OK, you ask, “ What causes it, here. Your best bet is to hold onto the and how do I correct for it?” tail boom very carefully with your back You might remember that several to the wind. This prevents the helicopter months ago I talked about translating from blowing back over your head in the tendency. (May '83 MB). Very quickly in event of a gust of wind. Again, I would review, this is where the tail rotor’s prefer that an accomplished pilot trim thrust, as a side effect from correcting your ship while both of you stand clear. for main rotor torque, wants to slide the This is for the novice pilot in the middle helicopter to the left on a clockwise of nowhere with no help. Make sure you rotating rotor system. To correct for this can work the throttle with your free in a hover we give slight right cyclic. In hand. Increase throttle so the helicopter the end the helicopter actually hovers comes up to a comfortable altitude. Two over one spot as shown in Figure 1, to two and a half feet is a good altitude, looking from the tail forward. It hangs to assuming you started from a position the right, sometimes called “ right skid kneeling on one knee. You must give low.” (On a counter clockwise rotor enough throttle for the helicopter to system, the helicopter will hang to the develop its own lift. Don’t force the ship left, or left skid low.) off the ground by lifting from the tail Now consider Figure 2 where the boom! same helicopter is sitting on the pave­ Once the helicopter is at approxi­ ment, level, or perpendicular to the mately two feet and under its own lift, ground. As the rotor builds lift to break This whole thing can be screwed tightly trim roll so you don’t have to “ twist” the ground, the tail rotor's side effect wants on to the top end of the pipe. You can tail boom to keep the ship over one to blow the helicopter to the left, use clamps or bungee cords to hold the spot. It should remain there by itself. If causing it to slide left on the pavement. helicopter’s skids to the table, your done properly, you should even be able The slight right cyclic normally trimmed preference here. (See sketch.) in for hover does no good on the Start the ship, and while it is still at an to relax your grip slightly on the tail boom once trim is set. ground, as the skid's contact with the idle, place it on the top of the pole, strap ground forces the ship to stay level. In it down, and clear the area. Then run up FORE-AFT CYCLE essence, roll control is useless on the the engine, adjust the mixture and the It is nearly impossible to trim pitch by ground, because the rotor disk can't tilt pitch at full throttle, and spool back holding on to the tail boom. The reason the fuselage. down to an idle before removing the is that an aft cyclic control results in the So. the novice gives right cyclic to try ship from the stand. same motion as increasing throttle. (The to correct this sliding, but when the This is a bit of trouble for one person ship rises slightly above hand level, helicopter does break ground, this to make and use, but if there are several tilting back . . . the hand essentially "extra” right cyclic (which isn’t doing helicopter pilots in your area, it becomes becomes a pivot point for the whole any good) is way too much, and instantly a most useful tool. Now that tracking, helicopter . . .) If you do try it this way, left-right cyclic over controlling sets in. blade speed, and engine mixture are let the ship “ float” at the altitude it Now, you might think this is getting properly set. refuel the ship, and place it seeks, which will vary a good six inches complicated, but it’s not, because it can on the ground for trimming the flight to a foot. Then, relax yourgripon thetail all be summed up very easily: A helicop­ controls. boom slightly, and try to sense if the ter that hangs right in hover must sit to TAIL ROTOR helicopter tries to drift forward or the right on the ground. (Clockwise All tail rotors should be set up to fly rearward. Compensate with fore-aft rotor system.) Conversely, a ship that the nose of the helicopter, i.e., stick to trim accordingly, but expect to change it hangs left (counter clockwise rotor the left, nose to the left. As the throttle is slightly once the ship is on the ground system) must lean to the left when it'son advanced, the tail rotor will be the first on its own. It is most likely that this the ground. One or the other condition flight control to “ come alive,” especially method of trimming for pitch will get must be fulfilled on your helicopter if if the tail rotor pitch is way out to start you "in the ballpark.” The best way to you ever expect it to break ground with. trim pitch is to put the helicopter on the cleanly into a hover without using right- Aim toward a trim that keeps the nose ground, advance throttle just to lift-off left cyclic. As I said before, anybody who straight just as the helicopter starts to and note any fore-aft drifting. Compen­ has learned how to hover has also slide around on thetraininggear.Bythis sate accordingly. learned how to give the slightest roll I mean that the ship is “ light on the Now all trims have been roughed in. correction just astneshipbreaksground. skids,” almost ready to fly. If you add or At this point, adjust the actual pushrod Under normal conditions, most gear cut power quickly, the nose will always length to return all trims on the TX to won’t have to be shimmed too much, spin around on a fixed pitch ship with no neutral. There is only one more item to probably somewhere around two or tail rotor mixing, and movement even dial in before you can start practicing three degrees. This will just be notice­ with mechanical or electronic mixing is your hover, and that has to do with the able when the helicopter is on level

70 MODEL BUILDER «Challenger’

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ground. charger make mention of the fact that all mixing inside the transmitter for: (Ί) ele­ You can shim two ways. . . see Figure Ni-Cds will not take to M.E.N. charging, vator trim in response to flap setting 3. One example shows where the left and include some precautions to take on changes, (2) spoiler/aileron coupling; gear has actually been shimmed up. the first go around. I found this to be and (3) rudder/aileron coupling. If you (More realistically, the right landing true when I started to use the charger, know of any modifications which I can gear bows have been cut short. ..). The and lot of my initial tests were made on make I d appreciate the information angle between the gear and fuselage is old batteries which I no longer intended Well Jack, as you probably know, Air­ still 90 degrees, but the helicopter leans to fly with, but were kept around for tronics has some plug-in mixers, but the to the right. The other example shows flashlights and testors. Since then, I have XL is not one of the transmitters for where the landing gear bows have been not run into any of the currently avail­ which they are made. But, all is not lost, shimmed at the fuselage. The gear able Ni-Cds which did not accept the and while I can not furnish you with any remains unchanged, but the fuselage pulse charging from the C-50/4. component-by-component modifica­ still sits slightly right. Either way is fine, it Another point to remember is that tions, it is possible that I can at least point just depends on which way is easier with some of the Japanese import transmitters you in the right direction. your particular helicopter. include a series diode in the circuit from First of all, the Airtronics XL is designed This fairly well concludes the articles the charge plug to the batteries, I’ve around the Signetics NE5044, the 1C on initial trimming. From here the never learned exactly why. It does which is designed with mixing and pro­ subject would change to flying tech­ prevent the connection of such devices gramming in mind. Although there are nique or flight trimming. Maybe we’ll as Expanded Scale Voltmeters and bat­ bound to be physical changes from one look at that in the months to come. tery cyclers to the transmitter, and might transmitter to another among the differ­ For the past week or two I have been also affect the operation of this type of ent transmitters that use this chip, elec­ starting construction on Kobe-Kiko’s charger if connected in that manner. tronically they have to be very similar, new Robinson R-22, imported by Dave Before depending on pulse charging in the design of the chip makes certain Robertson of California Model Imports. this case, I would determine the current requirements necessary. Thus, what will This is an extremely cute ship, and the capacity of the transmitter’s battery work in one NE5044 transmitter will scale fidelity is very high. Kobe-Kiko has (making the necessary internal connec­ work in another, requiring only the gone with a flybarless rotor head which tions) when charged with the furnished necessary interfacing. really preserves the looks of the real charger, and then making a comparison In this case, I would start by obtaining thing, and from what I see, they have test with the M.E.N. charger. copies of the XL schematics, which Air­ made this flybarless system exactly the Last suggestion is that if you have tronics will furnish on request. Then, a way it has to be done to give good flight more than one system, the versatility of copy of Fred Mark’s book Getting the characteristics. Yes, it will be reviewed in the M.E.N. charger (as well as all other most from Radio Control Systems (Kalm- time, so hold on. chargers and test equipment) can be back Publications, available from Ace In general, it looks like the next six improved by the addition of Dean’s or R/C) is in order. It covers thedesign and months will be very busy, and I’m sure audio type connectors to the leads, with functions of a NE5044 transmitter en­ you’ll enjoy what’s coming up. I hope properly equipped jumpers to make the coder, and the many mixing and pro­ you’ll follow along. Feel free to write: connections directly to the equipment gramming possibilities. The Ace Silver Ray Hostetler, c/o Model Builder Maga­ involved. A clip equipped jumper is a Seven transmitter instructions also con­ zine, P.O. Box 10355, Costa Mesa, CA must for the charging and testing of all tain a lot of useful information about the 92627. · *I new packs before installation. Enjoy . . . application of the NE5044 .. . which but keep your hand out of the wall plug. leads us to the bottom line . . . the AIRTRONICS XL, AND MIXING marrying of an Ace Silver Seven Mixer Electronics . . Continued from page 43 We get letters . . . one of which came into your XL. Not exactly your plug-in to Bill Forrey,ourin-houseglider expert, modification, but one which should for me to repeat all of the results of said and was passed on to me to comment on work and should not be impossibly diffi­ testing, but you will like the article, a part which falls more in the area I am cult once the idea, which Ace describes which even includes a schematic. The attempting to cover. It came from Jack as “ mind-blowing” and requiring some issue is still available from MB for two Cash, Walkersville, Maryland, who “ diddling” around, is clear in one’s dollars (second class mail, postpaid). writes: mind. Should be interesting, good luck I have only a couple of comments to "I've got an Airtronics XL six-channel if you tackle it, and let us know the add. One is that the instructions with the radio and would like to have electronic results.

FEBRUARY 1984 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! tried to simplify this particular problem, but, except for the relatively more Bring the Mono Kote* classroom complicated glow- or plug-drivers, right to your own TV . .with Top Flite's. none have survived. One method that one hour MonoKote I Video Tape. appeared a few years ago which looked From simple flat surfaces to fillets promising was the use of a heavy diode and hinges. Top Flite’s video tape in series with the positive lead to the teaches you basic MonoKoting skills. starter, and using the voltage drop Learn right in your own home. . . per­ across it to light the plug. In practice fect for club showings, too. though, it was discovered that in addi­ • Purchase for only $39.95. tion to a lower voltage being delivered • If rented, return within 30 days for to the starter, a stalled starter would $20.00 refund. • VHS or BETA format available. result in a blown plug. If you can live session • Each order receives a valuable with a slightly more complicated circuit, coupon worth up to $75.60 off though one which is adjustable to com­ list price of 12 six foot rolls of pensate for all those variables men­ MonoKote. tioned, you might try the enclosed Top Flite. ..helping you every step circuit, which is a type of adjustable of the way. voltage regulator. It uses all readily avail­ Send check or money order for able components, and is not critical as to MONOKOTE I $39.95 with name, full address and layout, though I would not blame you at V ID EO choice of VHS or BETA format to: all if you resort to a simple four or seven amp Ni-Cd cell for the chore. In your TAPE J area, try Industrial Liquidators on Con­ voy Street for one at an acceptable price. TOP FLITE MODELS. INC. AIRBORNE CLOW PLUG SUPPLY MonoKote I Video Tape Otter 1901 N Narragansett Ave . .. ONE MORE TIME Chicago. IL 60639 Last month I was talking about my use of a two-volt gel cell for airborne heating of the two plugs in a twin. I’d like to expand on the subject a little bit, with Well Bob, I’m afraid that you’ve come some further recommendations about up with a seemingly simple question that how to make the proper connections cannot be answered in a simple manner. between the airborne supply and an In theory, and using Ohms Law, we can outside one. The system will work as well arrive at some useful sounding values. for a single Ni-Cd cell lighting the one For example, we can calculate the plug on a one cylinder engine, as it will resistor value from the formula: Resis­ with the twin previously discussed. tance equals Supply Voltage minus De­ The hardware required is a two con­ sired Voltage divided by Current. Thus, ductor phone plug, and a two conductor we have 12 less 1.5 over 3, the latter closed circuit phone jack, both available being an average current for glow plugs. from Radio Shack and most electronic Working that out, we get a resistance of parts suppliers. Both are made in 1/4- 3.5 ohms. As the resistor has to absorb inch to 1/8-inch miniature sizes, the power, we figure that with another larger one being recommended for ease VL-102 formula: Power equals Current Squared ELECTRIC of wiring and current handling capacity. times Resistance, which in this case The phone jack is actually a type of PROPULSION (9 X 3.5) equals 31.5 watts. Thus, it two-way switch, which in one position SYSTEM begins to look like we need a 3.5-ohm, connects the plug to the internal battery. Send 31.5-watt resistor. 50C for When the plug is inserted, it breaks that complete Now the catch . . . it seems there is connection, and connects the plug to illustrated always a catch, doesn't it? The above is .CATALOG FAST the external battery or glow driver. If CHARGE based on the stated figures, and natu­ used, the servo operated switch works rally, if any of them change, so will the only on the internal battery circuit. CONSISTENT results. In this case, we get many PERFORMANCE The simple sketch should be self changes, starting with the 12 volt battery explanatory, the polarity is not impor­ which will read higher just after being tant though it should be maintained as a QUIET OPERATION - permits flying most anywhere- charged, and lower if loaded down with eity parks, front yards, etc. matter of habit. When the plug is partially a starter. Neither do all glow plugs draw inserted, there is a short circuit pro­ LIGHT WEIGHT - V k O z - but powerful enough for current at 3 amps, the figure varies duced, until the tip emerges past the models weighing up to 10 oz. somewhat for different brands and jack’s body, so it is a good idea to turn INSTANT STARTING - no priming, no continuous types, varies as the plug ages, and varies the external power on after the connec­ flipping of prop to start. when the engine is flooded. If that isn’t tion is made, and turn it off before the MORE EFFICIENT - lower rpm - lower running cost enough, at such high currents, the very plug is withdrawn. CLEANER - no fuel to mess up your plane. resistance of the wire used to complete the hookup is enough to upset the cal­ BUYER’S GUIDE TO RADIO culations. AND ELECTRONIC PARTS PRODUCTS You can see that this is not a very There is bad news . . . and there is 7Θ71 ALABAMA AVENUE . »16 practical method, but if for some reason good news! Within days of each other, I 1 CANOGA PARK . CALIF 9130-5 you have to use it, I would start with five, received two new books. One was the CLOW PLUG POWER SUPPLY one-ohm, ten-watt resistors in series 1984 Radio Shack catalog, which as usual A letter arrived from Robert Clark, La (one after another). This will give you is packed full of wonderful electronic Mesa, California. He writes: five ohms, at 50 watts. The extra resis­ things, including all those inexpensive "Dear Eloy, Can you tell me what tance will compensate for some of the components which we are able to buy resistor to get, like from Radio Shack, so variations mentioned, you may have to there in single units (usually), orat most, I can run my 1-1/2 volt glow plug from a use only four in some cases, maybe even by twos or threes. Though somewhat 12 volt motorcycle battery? Your help is three in others. higher in price than what we might pay much appreciated!" There have been a number of ways for the same brand and part number 72 MODEL BUILDER V ELT Μ A S T ER include four voltage ranges (including 12V for starter batteries), a Load Engage switch The Voltmaster is a sophisticated, prec­ to m onitor the recovery rate of the cells ision device which is as accurate as any ex (an important parameter in determining pensive laboratory unit. You can be confi cell condition), plus a Load Status switch dent that the readings it gives are true. so two different loads (200 ma and 500 ma) The Voltmaster very precisely measures can be engaged so that large packs. . transm itter and receiver battery voltage 1 200mah and up. . .can be monitored while it is under load to determine whether with validity. Less Connectors the battery is reaching a discharged state. Green; yellow, and red scales indicate a go- 26K18 — Vo It master. Kit $24.95 caution-no go situation. Unique features 2GK 18C—Voltmaster. Asmbld. $29.95

d iviv c SR packs, or large packs w ith 1 200 - 2500 duAl METERfd VARl'ChARqER mah cells. W ill also charge your 12V starting b a tte ry . This is the most versatile charger you'll A meter accurately measures the current ever find! The DMVC has two variable out­ being produced on either output so you don't puts, both of which can produce up to 250 risk overcharge. Less Connectors ma so you can charge two 1-10 cell packs from 100 ma to 2500 ma capacity. Perfect 34K32— Ace DMVC, Kit $ 3 9 .9 5 for standard receiver and transm itter packs. 34K32C— Ace DMVC, Asmbld. $ 4 4 .9 5

Send S2.00 for our complete catalog. All Ace items are ACE i/C. Inc. available at your dealer, if you must order direct, add $1.00 handling fee. P.O. BOX 511 D. HIGGINSVILLE. MO 64037 (816)584-7121 from other sources, Radio Shack has the formation includes the variety of parts advantage of being nearby when we carried by thesupplier,andan indication need the part. The bad news this year is of how complete the supplier’s stock is that though a few new components are for that part. The reader can thenconsult "f l e x - o f f " cataloged, a larger number seem to have the “ Supplier" section for the company's FLEXIBLE METAL EXHAUST TUBING been dropped. No longer can you get a address, telephone number, catalog Hall Effect device, less power resistors cost, minimum order information, and are listed, as are less transistors, and a • LIGHT WEIGHT GALVAN 12 EO STEEL whether the offered parts are new or • EASILY BENT, WILL HOLD |T” S SHAM case which was to house one of my surplus. • FUEL PROOF-HOT EFFECTED DY HOT future article projects is no longer avail­ Of interest to us R/C'ers, the Guide EXHAUST OR HOT FUELS ■ HORN DRIVE CLAHP INCLUDED \ able. lists suppliers of batteries from alkalines, ■ WEIGHS ONLY SLIGHTLY HORE THAN The good news is that the other book to gel-types, to Ni-Cds. Resistors, IC’s, RUBBER OR PLASTIC TUBING which came my way more than offsets LED’s, hardware, wire, it lists just about the loss of the availability of parts from everything you might need for just -SIZES TO FIT HOST HUFFLERS- No. 104F0 1/ 2*' <51· . x 12" 5.75 Radio Shack, and helps the component about any electronic project. It will be No. I 07F0 5/ 8“ 81· . * 12" 6.00 rocurement considerably. All of us No. I 08F0 J / V <51· . X 12" 6.25 useful to write off for all of the freebie Ho. I 09F0 7/ 8" d la .x 12" 6.50 now how frustrating it is to need a catalogs listed! certain part, which we know is made in For only $6.95 postage paid, this TATONE PRODUCTS CORP. thousands or sometimes more, and not buyer's guide is definitely a bargain. Tell 1209 Geneva Ave.San Francisco, Ca.94112 be able to buy one because the distrib­ them where you read about it! 415-334-7189 utors only sell in quantity, or have a high TESTING, ONE, TWO, THREE, FOUR . . . minimum order. The book in question is A couple of situations have come up at control of your airplane, it will drop into entitled above, and is published by the flying field very recently which have radio range and not be a half-mile in Hallward Products, 39 Sunset Court, St. reminded me again that some things horizontal range away from you when it Louis, MO 63121. cannot be mentioned enough . . . there starts. The Guide is written primarily to assist are those things that we forget, and then Collapse the antenna a section or two the small quantity buyer of electronic there are always beginners who may at a time, preferably with a helper to do and associated mechanical parts in have never heard. the collapsing, and to extend it in a hurry finding a supplier. Each supplier listed One has to do with radio range, start­ if things go wrong! You should be able has been chosen because of its stated ing with antenna-less or antenna-down to maintain solid control all the way interest in selling to individuals by mail testing before you fly, but what I really down to a one-section antenna, and order. want to mention (again) is the value of with some systems, those with an inter­ The Guide has two sections: a "Direc­ an antenna-down test where the an­ nally mounted antenna, to an even tory,’' and a "Supplier Inform ation’’ tenna is collapsed at least down to one shorter length. This is assuming that section. The “ Directory” lists parts from antenna section while the aircraft is in everything is A-OK, the tuning of both over 85 companies alphabetically by the air. Naturally, you want to do this receiver and transmitter, the batteries, generic name with a part number, with plenty of altitude, and almost etc. A system might operate normally description, and supplier. Further in­ directly overhead, so that if you do lose under normal antenna out conditions,

FEBR U A R Y 1984 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 73 than airplanes. In this case, once as­ WILLIAMS Λ CCOT? TT h C suring yourself that the charger and BROTHERS A L L L JO U K IL j charger related components (such as the switch and switch harness) are not at fault, and that there was not a power failure in the house during the night i PILO T S preceding the first flight, thus shorten­ STANDARD · SPORTSMAN RACING · MILITARY ing the charge time, even if the batteries subsequently accepted a charge and W H E E L S ► capacity tested successfully, it is still an VINTAGE · SMOOTH CONTOUR unexplained failure, which having BALLOON · GOLDEN AGE happened once, could happen again. Run them in your non-com petition låfåfir i EN G IN ES electric car, use them to power your ^ PRATT & WHITNEY · WRIGHT · IE RHONE calculator, but for the life of your air­ plane, don’t fly with them! End of sermon, Amen! PARTS ► LOCAL SERVICE PRATT* & WHITNEY · IE RHONE Sooner or later, your R/C system is going to need some attention, if for no other reason than that you’ve flown it a couple of seasons and want to be sure that it is ready for a third one. I have always felt that the technicians best qualified to service any given system are VICKERS · SPANDAU · PARABEllUM those found at the factory, or at that

SEND $1 FOR FULLY ILLUSTRATED CATALOG company’s main US facility, in the case DEPT. MB 181 PAWNEE ST. SAN MARCOS, CALIFORNIA 92069 BROS IHC ^ ------of foreign manufacturers. This is not to say that those technicians are basically any better than any other trained person, Can you really afford to use less but they have the added advantage of having a greater volume of technical than the best battery packs made? information and parts, and more systems to learn on than someone outside that particular company. A close second in this respect is the outside service center SR aerospace grade battery packs give you technician, if he is supported by the • 3 Times the Hying time parent company with information and • The ulimate in reliability parts. • 80 Packs to choose from for However, all radio service does not transmitters, receivers and require a complete overhaul or propri­ electric powered cars and planes etary parts, and there are many capable • Send a self-addressed stamped technicians around the country per­ business sire envelope for full details forming such service. Some are working on a variety of systems, others prefer to stick to one brand, usually the one of ,β λ * T n m e s m c their choice, which they have learned ^ BO* ?07 BflLPOOT NEWVQRK M713 enough about to feel confident with. but might have a small discrepancy to do unique and interesting, well-built de­ For basket cases, I will always recom­ you in. A test of this sort will not tell you ign. In answer to my question about mend the factory or authorized service what isn’t right, but it will tell you that whether or not it had yet flown, he told center. However, as most doctors, law­ something isn’t right, and point you me that it had been in the air briefly, just yers, and Indian chiefs usually cannot towards the need for some expert tests once, and how lucky he had been with locate or correct a minor fault that one and service. it. It seems that soon after lifting off, it of these local techs can, and in the I have not tested all R/C systems started to get soft on the controls, and interest of time and money savings . . . I under these conditions, but I have seconds after a successful landing, the would like with your help, to get those tested many, with the help of my friends radio had quit completely. Subsequent guys out of the closet. who own brands of radios which I don’t, testing proved the recently charged air­ So, if you know of some local tech and I have not found any brand or type borne batteries to be completely down. who is capable and willing to help out, which does not consistently pass this air­ The batteries had since been recharged, someone whom you would let work on borne test. If yours doesn’t, especially if they “ seemed” to be OK, and he was your radio, let me know who he is so I it is a type that just recently became once again ready to take to the air. As my can list him here in the hope that he can available, do some comparison tests advice was not being solicited, I didn’t help that guy across town, who doesn’t with other similar radios at the field. offer it, other than to mention the avail­ know him, get his gear ready for that Maybe it needs two antenna sections ability of a number of battery back-up important contest next weekend. out. If they all do, that is your standard, systems on the market, and my success For that, and of course for all related and it should be used for future testing. with completely redundant airborne subjects of general interest, you can Oh yes, don’t do this once and forget it, systems. contact me through MB, or directly at: it is a good test to make now and then, The airplane was again flown. Sad to 231 Cottage Place, Costa Mesa, CA maybe even as much as once per flying say, it was not as lucky on that its second 92627. · session. Don’t ever take it for granted flight, and will probably not be rebuilt. I that the airplane-eaters ever sleep .. . do not know if the batteries were the they don’t. cause, nor did I feel that it was the Hannan...... Continued from page 55 And it seems that we cannot ever say proper time to ask, but as the crash was too much about batteries, which are still caused by loss of control, the odds are in most generous show of sportsmanship, the weakest link in our R/C chain. I was that favor. Wells’ model was simply entered in the admiring a friend’s new airplane, a The point is that batteries are cheaper Sainte Formule non-scale class, which 74 MODEL BUILDER does permit single-surface wings, and the little Wee Bee gave a credible account of itself by placing 5th, which X-CELLBNT was good enough for a trophy. In the case of Bill Noonan’s models, they are RESULTS' being kept in Belgium for participation in future contests. The victorious Junior Peanuteers and their models were: Bohnert (Germany) flying a FRED; Sassi of Belgium with a Lacey, and Alvarez of Belgium, flying a Cougar. Placing first and second in Open Peanut Duration was Delcroix (France), using two different Pottiers (multiple entries were permitted); and third was Glockner (Germany) with his FRED. The remainder of the field in­ cluded a variety of types such as a Zippy IMPBA & NAMBA ENGINE DISPLACEMENT RULES... Sport, Scheibe Falke, Pilatus Porter, From the 3.5cc outboard up to and including the 15 and Trempik, Canagobie, Demoiselle, 30cc marine engines there is now an Octura X-series Coupy, Slahlwerk, Waterman, Libellule, metal propeller to get maximum performance. Volksplane, Farman Moustique, Petit Brochet, and the inevitable Laceys plus a Fike. RECOMMENDED 3.5 OUTBOARD In the Maquettes class, the top three APPLICATIONS TUNNEL placers were Genther (Switzerland) with 3.5 OUTRIGGER 7.5 OUTBOARD a Dufaux No. 4, Pham with a Bell Aira- TUNNEL cobra, also from Switzerland, and Gen­ ther with a Lockheed Orion. Others in .75 DEEP VEE 7.5 0UT80ARD the category included a Blériot Xlb, 7.5 OUTRIGGER .65 SCALE HYDRO Fokker F VII, Douglas AD6, Wibault, 65 DEEP VEE Tailwind, Waterman, Breguet, Dornier .65 OUTRIGGER DO 355, Stolp White, and a Farman . 00 f°.r „ 7 3 " Indicates .90 DEEP VEE David. p,ice 3-Bladed Propeller ■ 2 5 0 Bore TWIN .90 OUTRIGGER Seven special prizes for the various cal list to: categories were also awarded, including nOTIIDA ΜΠΠΠ G IMP THE R/C MODEL BOAT PROPELLER PEOPLE F. Van Hauwaert’s Maquette Peanut U ll I U n n IYIUUl LO, I lib . 7351 N. Hamlin Ave · Skokie. IL 60076 Cup, won by Genther of Switzerland; the Ceramique Nationale Peanut Dura­ tion prize, won by Delcroix of France; the surfaces covered with green silk. As the Challenge Pottier, won by Genther far as I can recollect, the propeller was of "ANOTHER GREAT WINDER" of Swtizerland; the cup of the Maison quite fine pitch, and the spoked wheels Des Jeunes, awarded to Ciapala, of were pressed out of tinplates. The IMPROVED Poland; the Rene Jossien Sanitě Formule astonishing part is that they flew . . . not SMOOTHER cup for open age class, won by Defour- very far, but they did fly. However, when ney, of Belgium; the Rene Jossien Prix the soldered joints failed, we had to give List - $64.95 en Espece Junior Sainte Formule award, up, as we didn’t know then how to mend Plus s hipping won by Serge Aulotte, of Belgium; and them.” Your columnist also recalls these the cup of the Banque Bruxelles for models were sold in the "dime stores” of Penny Plane, won by Desmet of Belgium. Montana. Do any of you readers have Another Ceramique Nationale prize one of these items? If so, we would be JOHN MORRILLS "SIDEWINDER" went to D.T. Pham, of Switzerland, who pleased to publish a photograph. Precision Built Heavy Duty Winder! placed first in F1D beginner. MORE GOOD OLDE DAYS Turn Counter kit - $18.00 We have gone into more than our Sears McCorrison, of Stoughton, $1.00 FOR CATALOG usual coverage of this affair in an effort Massachusetts, shared a copy of a 1931 to generate more support for proxy George D. Wanner model kit and supply JIM CROCKET REPLICAS entries, a most satisfying and relatively catalog, and its prices make rather P 0 BOX 12600 inexpensive way to participate in inter­ startling contrasts to those of today: FRESNO. CA 93778 national competitions. The rewards are Flying model plan reprints (Twin Pusher, not only the unique trophies, but the Mystery Tractor, nigh-climb R.O.G., and are ideal for use in Little Giant razor chance to help support the spread of our Boeing P-12B, etc): Two cents each. planes, as well as tissue trimming chores. hobby on a world-wide basis and enjoy Balsa wood sheet: 1/16 x 6 x 8:18 cents; At only ten dollars per hundred, post­ the friendship of other people who 1/16 X 6 X 36: 40 cents. paid, these collectors’ items are indeed a share our interests. Announcements of The company slogan: "If you Wanner bargain. forthcoming Flemalle contests are ex­ win, Wannerize!" STAINLESS STEEL WIRE pected later in the year. BORON AND BLADES How about some non-rusting rigging REMEMBER THESE? Jim Jones, 36631 Ledgestone Dr„ Mt. for your scale models? W. Gehres, of Aviation artist/m odel builder Ken Clemens, Ml 48043, is marketing Boron AIRKNOCKER THINGS, Box 421, Buck­ McDonough, of England, reminisces filament, ideal for stiffening indoor eye Lake, Ohio 43008, is offering .004 about toy aircraft: "I remember when model wing spars or tube fuselages as diameter stainless steel wire in six-foot we were kids, flying models made in well as strengthening glue joints. The lengths for two dollars, postpaid (Ohio Japan were sold in Woolworths. They material is marketed on four-inch dia­ residents add 51/2% tax). Greater lengths looked rather like Blériot monoplanes, meter spools holding approximately 250 are available at proportionate prices. although sold about 1936-37. The whole feet, for 15 dollars, postpaid. Gehres sent in a couple of good framework was of fine w ire. . . the fuse­ Jim has also discovered a supply of aviation quotations, one of which is lage being of triangular section and left genuine, 1945 razor blades. These attributed to designer and model uncovered. All joints were soldered and double-edge blades are only .006 thick, builder Bill Stout: "Never resort to

F E B R U A R Y 1984 WHEN CONTACTING ADVERTISERS, TELL ‘EM MODEL BUILDER SENT YOU! 75 called the Super-Duper Prop Hanger Eliminates GLITCH problems associated with long servo leads. This is an ideal setup for those of you e l .____ who enjoy ROG models, or Profile Scale Eliminates need tor voltage robbing chokes and other devices with models, or Cal Scale. The directions are leads over 15" long ^ self-explanatory. A Modern CMOS IC technology While at the model shop the other Uses less than 0.5 milliamps at 4 8 volts day, I came across Monogram's 1/12- STOP Power lines are capacitor tillered scale (one inch equals one foot) model Available in 4 versions with connector installed: Wright Whirlwind engine. This was originally issued sometime during the S10 95- Single Channel, single servo drive (Single) GS-1 S12 95- Single Channel, two servo drive (Wye) GS-1 Y '50s, so this is a reissue. Collectors have S14.95 - Two Channel, two independent servo drive (Twin) GS-2 been holding onto these kits hoping to S17 95- Two Channel, two servos per channel drive (Twin Wye) GS-2Y make a killing on the Whirlwind some­ EMS where down the road . . . C'est la vie! • Overall lead length is approximately 6" to 8' I « The cost of the engine is around twelve • Modeler must turnish own longer extensions as required dollars. S D e cifv R a d io S1.00 Shipping and Handling on Pre-Paid orders, add Several months ago, I mentioned ^ ’ 6% for California residents. Mastercharge and Visa. using dress snaps as an easy way to neatly 6175 PALO ALTO DR.. ANAHEIM, CALIF. 92807 (714) 637-2161 hold down a cowl hatch in place. To review briefly, to make them work successfully, the female half has a tiny wire spring which cannot have any glue “SERIES 5 0 ” Old Timer R/C STRUCKS 1940 on it. If it has glue on it, the male half of 1939 ^ the snap will not be able to snap in place. On a recent project, I chose to use the AIR TRAILS 4 NEW RULER Partial Kit dress snaps for a removeable cowl. In SPORTSTER © e $39.95 $33.00 the past, I had trouble keeping the oozing glue from getting onto the little .29 to .36 1.40) Glow 1938 74“ Span; 835 Sq ■ in. "C " or "D " Ignition spring in the snap. I tried something that A POWERHOUSE In addition to the Just Released New Ruler, the worked very well, so I thought I would following partial kits ere also available. pass it along. 9 $39.95 The 1936 FLYING QUAKER (Meguw's) 84" $21.50 50" SPAN 380 SQ. IN. 32-38 OZ.’ The 1937 QUAKER FLASH (Megow's) 67"span $17.50 The male half of the snap is simply The 1937 "LONG" CABIN. 78" span $20.00 "zapped" onto the firewall. On the 3 CHANNEL, .09 TO .15 POWER The 1937 AIR CHIEF (Ideal's). 61" span S20.00 "SERIES 50" Kits are Full Kits witn Machine Cut 6 Partial kits are Rib. Tip, and Former kits, i ney cowl, shallow holes are made where the Sanded Parts. Formed Landing Gear. Partial R/C feature Machine Cut and Sanded Parts, Full Size female half goes. This is necessary, of Hardware. Detailed Full Size Plans, and Printed Construction Plans, and building notes. They Assembly Instructions. [2 or 3 Ch R/C Gear Reqd.| meet SAM FF and R/C requirements. course, otherwise the cowl would not be COMING: 54" Quaker. 48" Flybaby. 48" Miss America COMING: 120" KG -2. 84" Miss Dcleware. 96" Lanzo RB tangent to the firewall. I mixed a small Cleveland Viking. 50" Cleveland Cloudster. At your Dealer or batch of epoxy glue and waited until it L ™ m z s m m M & m © add $2.00 per orderJ ordcr^, thickened up. I placed a small amount for UPS. Ca. ResResvT P O Bo* #9. Midway City. add 6% for Tax into each hole. At this point, the female half should be attached to the male half. mathematics until you have exhausted another, because every flying machine As the epoxy becomes tacky, place the all the possibilities of two toothpicks and man thinks his method is the only cowl in place and tape it down. a piece of string.’’ The second, from correct one.” Once the epoxy has thoroughly dried, German woman pilot Hanna Reitch: CLOSING THOUGHT carefully unsnap the cowl. From here ‘‘Carefulness is not cowardice, and From Terry Cole-Whittaker’s The on, it should snap and unsnap at will. carelessness is not courage.” If anyone Good News: "life is a game to be lived The key is to have the epoxy tacky may doubt Ms. Reitch’s bravery, they . . . not a puzzle to be solved!” · enough that it will not ooze, yet not so should be reminded that she was the tacky that it won’t adhere. first to fly a helicopter indoors, and later, It has been many years since I’ve seen test-flew a V-1 buzz bomb! F/F Scale .... Continued from page 61 anything about cutting out numbers or THEN AND NOW letters from tissue paper. For the old Jim Thomas, of Denver, Colorado, Neely an SASE for his list and prices. His pros, this is old hat, but for the newer favored us with a Rocky Mountain News address is 2703 E. Goshen Ave., Visalia, modelers, not necessarily so. The one interview with Reginald Sinclaire, who CA 93291. advantage of building from a commer­ has been witness to most of aviation’s 80- Buck Pilkenton has come up with a cial plan is that the registration and year history. He learned to fly in France clever aid in winding models which have license numbers are shown. That way, using a single-seater Blériot, then be­ spinners. As he had built a Flyline HE- you don't have to draw your own. came a member of the Lafayette Flying 100, he naturally called it a Heinkel I usually will take the plan and make a Corps, where he developed a fondness Winder. It could just as easily be called a Xerox copy of the letter and numbers. for SPADS, but had the misfortune of Corsair Cranker, or a Tupleu Twister or I’ll take some black tissue (assuming that shooting his own propeller when the perhaps a Brewster Buffalo Braider. At they are black), and cut out as many synchronizer mechanism failed. Later, any rate, you get the idea. pieces as there are numbers and letters. I he barnstormed, participated in air The device is really easy to use. Just do the same with wax paper. Next, I’ll races, and became an instructor during slip the hooks over the prop blade (they stack the tissue alternating with the wax the second World War. Sinclaire, now tend to lock in place). Try to center the paper, with the Xerox copy on top. I 90-years-young, retains his enthusiasm eye of the winter with the hub of the then tape the edges of the stack so they for all matters aviation saving: "Terrific! prop, and wind. Check the drawing for will not shift. Using an Uber Skiver knife Terrific what they do today. ' further clarification. Pretty clear, eh? with the No. 11 blade and a straight Mark Fineman has turned out to be an edge, the letters are cut out. THE WRIGHT STUFF excellent model builder and flyer. I say The wax paper in between keeps the In June of 1903, quite some time turned out because I had first met Mark, tissue from shifting so that neat, crisp before the most famous of the Wright and some of his models, at the first Flying letters can be obtained. brothers’ flights, someone asked Wil­ Aces contest. His models were OK, but I want to thank ail of you who have bur’s opinion of someone else’s design: now they are outstanding. The pictures written, and as usual, I’m way behind in “ It is very bad policy to ask one flying of his models will attest to that. He has my correspondence. Hang on, I’ll get to machine man about the experiments of sent in his version of a prop hanger you yet! ·

76 MODEL BUILDER For information send $3.00 to TECHNOPOWER II Inc. 610 North Street, Chagrin Falls. OH 44022 compound front tire. It is no secret that these tires are coming from Delta. R/C Autos. . . Continued from page 53 Yes, they are the new 324 series tires, I believe Associated prefers the "C ” to run. Can you say, “ fear?" While we compound, although I don’t know what have never scared any of the kids to the designation they will give it, don’t even oint of tears, at least as far I know we have a part number yet. As is commonly aven’t, we have had them dispose known, the RC500 doesn’t need super- immediately of any hand-carried ob­ sticky front tires to turn well, so they can jects. It has always seemed odd to me use harder (read, longer wearing) front SPECIAL OFFER!! that they would spend hours gathering tires while still hugging the inside line on For Sundav flying, pattern trainer, or fun sweets and stuff only to so quickly throw the track. As an example, I am sure that fly contests. You’ll be thrilled with the all to the ground in a useless escape the “ C” compound front tires on an flight performance! All balsa construc­ attempt. They rarely are able to find it all, RC500 would nearly go the full distance tion. See review in April ’83 PCM issue. next morning we have all the candy we Engine .40 to .51, wing area 600 sq. in., in a six-hour enduro. That’s a lot of weight 5 lbs. Radio 4 channel. Special could want laying right there in the racing on one set of tires. cul-de-sac. . .) (Thai's the biggest, offer $49.95 + $3.00 shipping. California For the chassis, the most intriguing residents add 6% sales tax. funniest parenthetical digression I've RICK'S KITS, P.O. Box 1106, Santee, CA ever heard! Those poor kids . . . this is item is production versions of the two- speed transmissions used at the recent 92071; (619) 449-3316 one Halloween they’ll always remem­ World Champs. Don’t think gear box ber! wrf) here, the two-speeds, as I understand To me the chain has always been one of Lastly, the guys at Delta have been their operation, are basically two seen doin’ it in the dirt. Several 1/8- the least attractive features of the RC500, clutches, one kicking in at speed. I and we just completed a full season of scale, gas-powered, off-road cars are in talked to Gene prior to the World, and at their hands, one of them is even four- lugging a spare chain to all the races; I that time they were setting the boxes to was absolutely convinced that sooner or wheel drive with three differentials. shift at 25,000 rpm . . . an engine speed (One diff unit is at each axle, plus there is later it would break. Wrong. It has easily obtainable on any straight of stretched some, in fact is getting quite one in the middle of the car to split the decent length. A shift at this speed ought power between front and rear wheels, sloppy, but has never given us any to drop the revs right down into the fat problem at all. OK, it is a little heavy, and much like the Audi Quattro.) part of the powerband for a good boot that is the primary reason for the switch; They are seriously considering im­ in the rear to wail the last part of the a belt drive is simply lighter. In addition, porting one of the higher-quality 1/8 straight where one-speed cars go flat. it is an efficient means of transmitting off-roaders, if there is interest enough to Although it sounds like a great little justify development, they are so cranked power, shouldn’t stretch nearly as much widget to play with, actual effectiveness as a chain (if at all), and needs only on this type of racer they are ready to on the track will depend a lot on the minimal maintenance. Still, it probably start designing one right now! Inter­ layout of each club’s race course. With a ested? Write to Delta Mfg., 27 Race Car isn't a must-have item. My suggestion is short straight, you might find the gear to stick with the chain until it gets really Court, Lorimor, Iowa 50149, or call (515) box shifting right at the braking point, 763-2220. Without taking anything away loose, or until the sprockets develop a even if adjusted to short-shift at, say, hook shape on the teeth . . . and then, from the very popular 1/10-scale electric 21,000 rpm. Then again, if your track has instead of buying a new chain, pop for off-road racing scene, I personally am super bite in the corners, possibly you the belt conversion. not yet too interested. But show me a can gear first with a stump-puller, and For bodies (and these are all presently mean 'n nasty 21-powered 1/8 off-road still make use of second on the straight. available), Associated is now doing up car, and I’ll fight you for the transmitter! In any case, Joshua is pumped about Not all of the new stuff is coming from trying a two-speed on the DRT’s RC500, lightweight versions of their most popu­ the Midwest, of course, out here on the so we’ll be letting you know how it lar bodies, the Porsche 30KL and Elfin for west coast Associated is, as usual, work­ works for us. Can-Am, and the Ligier Maserati for GT. ing on new and better parts for their Still in the drive train, Associated is The club I race with will in ’84 require suspension car, the RC500. The first item doing up conversion kits to switch the Can-Am bodies for the first half of the is available right now, and that is a new chain drive over to a toothed belt drive. season, then Formula 1 bodies in the

FEBR U A R Y 1984 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 77 equipment during the last few years, it is Why Stop Short of Full Scale Performance? not difficult to get our model marine engines running within the normal two- Twin Engine Sync System ■ For Perfectly matched RPM over the minute time limit provided for most heat entire throttle range - $60.00 races. Make certain your engine is properly Accessory Controller · Allows ON-OFF control of TW O electric prepared before your heat is called. devices from ONE channel - $35.00 Check the glow-plug and fuel supply prior to pit time. It is my practice to start SC-1 Electric M otor Speed Control - For use with 02 to 20 size my engine immediately once pit time motors up to 18 cells - $49.00 has commenced. If there is a problem in starting I then have thewholepit timeto SC-2 Electric M otor Speed Control - For Cobalt & H igh attempt to get the problem cleared and Performance motors up to 50 size and 26 cells. Includes BRAKE the engine started. Take the time to develop procedures that will allow you and BYPASS options! - $60.00 *DEALER inquiries invited* to get your engine started. Work on your SEND S.A.S.E. FOR PRODUCT INFO starting techniques until you can start JOMAR PRODUCTS 2028 KNIGHTSBRIDGE DRIVE your engine within seconds of applying CINCINNATI, OHIO 45244 electric starter. It can be done. If you’re having problems, seek out help from someone who seems to have starting R/C Boats .... Continued from page 21 techniques mastered. Listen to what they say. Watch what they do. SUGGESTION NO. 3 frustration model boat racing can gen­ You do not learn how to drive a model erate. It was simply unbelievable all the boat around a race course by practicing misfortunes and problems these two on an open lake. If a person wishes to wonderful individuals experienced. improve his or her driving skills, then it After observing their trials and tribula­ makes sense to me that practice should tions, I hope the following suggestions be done around a set of course markers. might be of benefit to others who are It is not necessary that the markers be set still struggling to achieve success in exactly like a regulation course. It is model boating competition. important, however, for the beginner to SUGGESTION NO. 7 get the idea of running around a certain Before you attempt to operate a radio location. Simply running around a pond controlled model boat be certain the or lake without any markers does little to radio equipment is not going to be improve racing skills. (I could drive a rendered useless by exposure to water. high performance sports car around the The importance of preventing water K-Mart parking lot, but that would do from reaching the radio equipment nothing to prepare me to enter a sports second half. So, we will probably be cannot be overly stated. It is simply a car race.) using a new Associated body, the Alfa- given fact that model boat race boats are Learning to race a model boat does Romeo 179D. billed as fitting the RC500. at one time or another going to blow take practice. I happen to know some (For those who don’t know, it can be over, spin out, or get knocked over very excellent model boat racers who difficult to fit some bodies to the RC500, while they are being operated. It's going live in my corner of the country. Their and I wouldn’t be surprised to find the to happen. names are documented in the record Alfa to be the only FI body that can be When I first started running model books for model boating achievements. draped over this chassis.) If your club is boats, I couldn't keep my radio equip­ Everyone of these excellent model willing to accept any open-wheel body ment dry. My first R/C model boat was boaters spends time practicing around a as legal in Formula racing, and your dubbed “ The Flying Sponge.’’ “ All set of buoys. They are champions. Like tastes run to Indy cars, the Longhorn Whet" and “ Phew Drops” were labels champions of any sport, they spend time Indy body is also a new one, and it too for other early model racing boats. It in training. fits the RC500. took me awhile to wake up to the fact SUGGESTION NO. 4 Last thing from Associated is news of that I’d be having a lot more fun if I The beginner needs to set realistic and the soon-to-be-released (as this is wasn’t spending so much time drying obtainable goals. I have discussed goal written) 1/10-scale off-road race car. I out my equipment. I solved my problems setting in other columns. A reasonable am looking for great things here; I was with wet radio equipment by copying goal for a new model boater would beto actively racing when Associated literally what the fellows with dry equipment start and complete a heat. Notice I said revolutionized 1/12 with their RC12E, were doing. I discovered it was possible complele a heal and did not mention and I see the opportunity for the same to make radio compartments that were the words win a heal. It has been my thing to happen in off-road. No, I have waterproof. That was really a big personal observation that beginners not seen the car or even any pics of achievement for me in this hobby. who become more concerned about rough prototypes. It is suspected that A waterproof radio compartment will winning than just finishing, end up they will use some pieces from the not assure you of victory. It will, how­ doing neither. I feel it is safe to say that as RC500 as that chassis has been proven ever, allow you more opportunities to often as not, we beat ourselves when we very reliable in high-speed 1/8 racing, compete in and complete racing activi­ are racing. The new model boater needs and use of their state-of-the-art shocks ties. It is a real challenge to win a race to concentrate on elimination of those from the 500 is almost assumed .although when your equipment is operating areas of self-defeat. Once you stop the travel will no doubt the greater. No properly. It is impossible to win a race if beating yourself you can focus your matter what the car ends up looking like, your equipment isn’t working. efforts on beating the other racers. or the components that go into it. if you SUGGESTION NO. 2 FLORIDA NEWS want to see the latest in off-road. Asso­ Starting a model engine within a ciated will have it. certain time limit is a skill. It seems to me Ed Ryder, of Coral Springs, Florida, Dan Rutherford, 4705 237th PI. S.E., that some new model boaters need to provided me with the following infor­ spend more time learning how to start mation about model boatingactivities in their engines than they do practicing on that area. the water. With the technical advance­ " Here in District III of the IMPBA. ments that have been made in starting which represents the Southeast portion 78 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU1 MODEL BUILDER One Good ENGINE Leads to ANOTHER... and ANOTHER ...and ANOTHER ...^ and that's the way it's always been· · · at K&B·

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LEHMBERG ENTERPRISES PRICE OF KIT INCLUDES: PLANS. RIBS. WING AND TAIL TIPS. 2646 Bolker Drive PLYWOOD. BALSA SHEET AND STRIPWOOD. MUSIC WIRE. NO CEMENT. LIQUIDS. COVERING OR HARDWARE. Port Hueneme, CA 93041 ‘Plus Shipping and Sales Tax. where applicable (805) 984-6639

heard from in the near future. The was a direct effort to take advantage of FLY OVER LAND OR WATER: Jacksonville club is noted for their the powerful new engine. Ohlsson had SUMMER OR WINTER Saturday night buffet, and this race was established another standard for all no exception. There were over thirty other engines to be compared against! different dishes plus smoked ham and When the first advertisement ap­ turkey. Those Lady Gators are great peared in the March 1940 issue of Model hostesses and cooks. Airplane News, this new engine featured "During the weekend of October 22 a diecast tank top (with a ‘‘Jiffy-Fill” and 23, our club, the BMBC, held its tank) with an integral air intake tube annual Race of Champions. Over one flared for a venturi intake shape. A very hundred fifty entries competed during neat setup! the (wo days for $1,500 worth of trophies The initial engine featured a 1/4-20 With R/C Modal Hovercraft. Kit models donated by local sponsors. The highlight spark plug and 1/4-inch diameter crank­ include XR-1B Length 40" Width 30” $69.95 + $7.00 Shipping. Challenger 1 of the awards ceremony was the presen­ shaft priced at $21.50. In 1941, the plug Length 24"x19" $29.95 + $3.00 Shipp­ tation by Bud Swenson and his family of size was increased to 3/8 as was the ing. FREE flight or Tethered models in­ the Junior Driver Award. This is an crankshaft. Also during this time, the clude Air Scout 24"x19" $21.91 + $2.20 annual trophy given to a boater under Custom engines were fitted with a gold Shipping. Air Raiaer 24" Dia. $21.56 + fourteen who throughout the weekend eagle on the front of the case. According $2.20 Shipping. Hovarbird 24" Dia. $17.99 + $1.70 Shipping. displays the attributes of sportsmanship, to Herb Wahl, noted Ohlsson expert, good citizenship, and cooperation. The the eagle did not appear on the first MC O' VISA No ______winner this year was Mark Sherfeld, a models, being simply stamped "60” on Exptration Date ------most deserving young driver. It is inter­ the fusion plug of the crankcase front. Signature ------esting to note that former winners have (The Flying Aces Engine Review,” De­ Name ______all continued as outstanding citizens and cember 1940, shows this.) However, avid R/C boaters. most everyone remembers the Custom Street______"The clubs in Florida are considering with that fancy eagle emblem. Oty ------developing a Florida Racing Association On the specifications of the engine, a with a district wide newsletter and displacement of .617 cu. in. was listed in annual point accumulation racing tro­ a Model Airplane News table of engines. phies. More on this later." This error in calculation, where the dis­ Thanks, Ed, for sharing with us news placement should have been listed as If using Visa or Mastercard, print or type from your area. I encourage more .604 cu. in., has been perpetuated in info clearly, and add 5%. For more infor­ readers to write down what's happening subsequent publications with no correc­ mation or to order - Write: ADVENTURE with model boating in your locality. tions made. MODEL CRAFT P.O. Box 255. Youngs­ Information, race results, and photos town, Ohio 44501. Ohio residents add Technically speaking, the new 5.5%. Checks or money orders only. can be sent to: Jerry Dunlap, 119 Crest- Ohlsson engine featued a die cast crank­ PLEASEI wood Dr. S.W., Tacoma, WA 98498. · case and manifold unit (including ex­ haust stack). The cylinder and head, machined from one piece of steel, was of the country, we have about 340 Plug Sparks .. Con tinued from page 38 then spot welded to the crankcase unit. IMPBA members. It is estimated that This was a system devised by Ohlsson about half of this number are active that set it apart from all other engines. racers. Mr. Bud Swenson of our club, the brother based on the successful layout The Custom model also featured Broward Model Boat Club, has just been of the 23. roller bearings to support the crankshaft elected to District Director. Bud is an In March 1940, the Ohlsson 60 Custom plus ball bearing thrust bearings to take excellent choice for this position, and made its debut in a more sensational up the horizontal play. Ohlsson, always we know will do much to advance R/C manner. This sixty was at least two one for making things last, provided boating. thousand rpm better than the Brown oversize crankpins and wristpins for the "Labor Day was highlighted by a great and other comparable motors. Here was engine. Very few Ohlsson engine owners race hosted by the Jacksonville Gator an engine that started easily, had excel­ ever complained about these items .. . Dodgers. All IMPBA classes were run lent power, was easy to disassemble and even after extensive running! with good growth in the O.B. classes. repair, and best of all, it lasted! The only way the modeler could get The boys from Georgia and Alabama As with the Ohlsson 23, this new 60 into the engine was through the remov­ were strongly represented in the latter brought out a rash of new models able-front cover which, when removed, classes, but it was evident that Florida is designed to accommodate the power. took the whole front end timer assembly coming on strong in O.B. and will be Even Carl Goldberg’s Sailplane design and crankshaft off. The engine could be 80 MODEL BUILDER inspected, but there was simply no way for the modeler to further disassemble BUZZ WALTZ the engine, a mixed blessing in that one could not tinker with the engine. Specifications of the engine called for R/C DESIGNS a bore of 15/16 in. and a stroke of 7/8 in., giving the displacement of .604. The 255 N. EL CIELO, SUITE 476 weight was 10 ounces bare, and it was PALM SPRINGS, CA 92262 priced at $21.50, a competitive price to BEGIN AIR TRAINER the Brown Jr. Performance figures as 54 In. span, 540 in2 area taken by the Air Trails strobatic tests, rate Nick Ziroli’s F 4 U “ CORSAIR” 3-4 ch. R/C the engine at 1/4 h.p. with 6700 rpm A memorable WWM Navy Cam·« Pigntc» H u «upmD My*ff using a 14 in. Flo-Torque propeller, 7000 For 2 to 4 Co. In. siz© Engines GIANT R/C SCALE PLAN DESIGNS with a high pitch, 12 in. prop; and 7,700 AT-6 "TEXAN" 2.4 = 1 lOl Spon $27 00 p.p. U S A. using a 10 in. dia., 10 in. pitch prop. In FOKKER OJM 2.7' =1 S3 Trip· $25.00 p.p. U S.A. / F8F BEARCAT" 2' ,* = | 86 Spon $27.00 p.p. U.S.A. any case, the maximum power was CURTISS P-40 2’T =1 94 Spon $27.00 p.p. U.S.A. F4U CORSAIR 2 'Λ ' = I 93~ Spon $27 00 p.p. U.S.A. stated to be at 7500 rpm. Fiberglass Cowlings & Canopies a>e available also. Send a Shortly after the introduction of the stamp lo« detailed brochures on our Oiani Scale Accessories $39.95 lOur Plans are sent Po9!patd within tho U S A | Ohlsson Custom 60, the Ohlsson 60 NICK ZIKOU 2? Edgar Driv» Smithtown, N.Y. 11787 Special was advertised in the October 1941 M.A.N. issue with the attractive model?? No, it's not a Powerhouse! BEGIN-AIR 40 TRAINER Maybe Codding can I.D. it?? 72 in. span, 760 ir»2 area price of $18.50. There apparently was 4 ch. R /C only a slight difference in power output To continue with the ramblings by and for the difference of $3, most Gordon, “ Talking about nostalgia gas modelers purchased the Special. models and the plans you are looking As time went on, the Ohlsson Custom for, reminds me of the time I was in production dropped, and the Ohlsson England in 1951-53. I amazed the locals Special became the well-known Ohlsson with my Cub 09powered Mini-Hogan 45 60. As pointed out before, the engine (used my famous split rudder detherma- became the standard of the model lizer. See Aeromodeller Annual 1952. $44.95 manufacturing business. All subsequent My enlarged and modified Comet Sail­ engines either benefitted or suffered by plane (I called it the “ Big Bomb” ) used a comparison to the “ Standard". Hornet 60 on glow and was based on the $25.95 THIRTY YEARS AGO, I WAS . . . Griffons Club design (Los Angeles). In line with the general rambling tone “ Generally, it was a vertical climb in a of this column, Gordon Codding has cloud of smoke and dust from an Al V sent us several letters, which, when ex­ Jolson ‘Mammy’ kneeling pose, and cerpted, prove some fair nostalgia. then that great California type floating Photo No. 8 is a color shot of Clyde buzzard glide. Guess I scared off the VELERO Austin’s Scientific Commodore that competition as / generally was informed 78 in. span, Gordon has taken on the job of restoring. that no one else was competing in that 635 in2 area As Codding says: classification. Sorry! But thanks for the 2 ch. R /C “ It is so old and dry, I figured to fly the demonstration! model on electric power. I tried my Estes “ The last year of my tour in the USAF, CAZADOR Skymax geared motor with a 14-8 folding the boys managed to pool resources and tOOin. span, 1047in2arearea plastic prop. Nice taxi, no flight! Hand stuffed a Rowell 60 car engine in the 2-3 ch. R/C launch, no help! Thought about the nose of an enlarged San de Hogan type Astro 15, but trie penalty of batteries design. The usual English practice was makes the all-up weight a real problem observed of many parts being fastened A vailable for that old structure. together with rubber band and tape. February “Am reluctant to try an O&R 60 side- The vibration soon separated the parts. 1984 port . . . don't want to risk a backfire. Model flew well but erratically. Maybe, a front rotary valve version and a “ Really, it was no contest as the com­ $39.95 long exhaust stack will work better. petition was only slight. Sometimes I Model is all recovered with lightweight simply won by default. I eventually gave DIRECT SALES ONLY silk, but needs more paint to toughen up the model to Ripmax Hobbies (less 619-325-5494 the old covering. Removed the old motor, of course!) when I left. Some­ 'Mickey Mouse' dethermalizer (didn't body made a glider out of it. They didn’t work anyway) and the model is back to know what else to do with it!" its original form when last flown at Los Gordon concludes by saying he still During the competition, Anderson Alamitos N.A.S. Nationals. has the plans and may build another. had the Baby Cyclone get so lean, the “ To digress, speaking of timers, I have Look out! engine ran foran unprecedented length about 10,000 body shells and springs for MORE NOSTALGIA of time, prompting many of the on­ several size timers. Also, a few covers, If the emphasis seems to be on old lookers to comment that Mel’s model but no plungers or contacts. Price is photos, it is because this writer has a real had an auxiliary gas tank. The model right!” (Write to Gordon Codding, 3724 interesting bunch to publish. Thanks to actually won on the length of the motor John L Avenue, Kingman, AZ 86401) Bill Simpson we have Photo No. 10 to run! While this columnist was going display! The main reason for showing Mel through the Codding letters, he received This is a shot of the contestants attend­ Anderson and his low wing (the third Photo No. 9 from the late Arthur Suhr of ing the Kearney Mesa contest at San model from the left) is to encourage the the early d^ys of Southern California Diego in 1938 who were thoroughly construction of low wing models for the flying at Rosecrans. The unidentified trimmed by Mel Anderson flying a Baby West Coast SAM Champs to be held next model has a 1937 Bunch Mighty Midget Cyclone powered low wing. As can be May 12-13 (tentatively at the Merwin for power. The model appears to have seen in the photo, the model is rather Dicondra Ranch). All low wings will be been built and flown in the 1937-38 era simply made, fuselage being just wide given a 50% increase of their time up to a as can be gleaned from the Ohlsson enough to accommodate the Baby “ max” flight. That ought to be incentive wheels. Anyone out there know this Cyclone engine. enough! FEBRUARY 1984 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 81 not fit properly as the wing appears to have a smaller chord than the original. CANNON The wing actually lists to the left, and it R/C S Y S TE M S SUPER-MICRO doesn’t appear to fit the fuselage plat­ 7 form properly. WORLD’S Radio Control “ Finally, a brief scrutiny underneath SMALLEST SERVO, Rx & COMPLETE R/C SYSTEM the magnifying glass (!) reveals that the workmanship in the wing is nowhere the SUPER-MICRO Servo, .4 7 oz X 3 1 /3 2 equal of the neat fuselage." (How about x I - 3 /3 2 “ , 15 o z . - In . t| :s w ith most that??) all positive ijutøe deVpdei O Rx (4 CH . “ My theory (aha!) is that Stan damaged 7/8 x ií« 9 /l6 ", weight .54 oz. his wing in some way. Someone, likely a WO hV uses la rg e r M IN I R x). F lite relative or friend, insisted on taking a mpotible with Tx of most other makes. picture. So, a wing was borrowed, but P/^KS unfortunately, there was no other O Bombshell on the field, so this ‘make- ( 2 .9 o z .) do’ wing was used. '83.50 (3 .3 9 o z .) “ I’m sorry to be this way, but I feel it is more interesting, and does show that 216.95 i3.88 oz.) your efforts in the column don’t go in 219.95 <4.16 oz.) vain. You are read, and the photographs examined. ” SERVO $34.95 M IC R O RX $8 1.95(4 CH.) Well, this isn’t the first time this has 'M icro or Dean's plug; others S2.50 extro. happened. The writer can recall numer­ ous times when the o rig in a l was SHIPPING: Systems S6.50; Flite Pocks S4.50; Servos,Rx S3.00. damaged. Check the Sunduster photo Cal i f . odd Sales Tax. 20% deposit on C .O .D .'s. Brochure 75c by Jerry Brofman in Model Airplane U .S ., S2.00 Foreign. CASH DISCOUNT PRICES SHOWN. News. The model has a Sailplane wing 13400-26 Saficoy Street N orth Holly wood, Calif 91605 Phono 1213)764-1488 on it! Perhaps the most intriguing photos are those of the Gladiator with the original flying pictures showing a long wing somewhat on the order of a Play­ boy Sr., while the plansshow a Rocketeer 'MANCE type wing. Theory again, a last minute Standard Class R C sailplane for switch was made with the drawings slope; F3B: and thermal contests modified to reflect the last wing used in S EM I K IT : the photos. We’ll write more on that FIBERGLASS FUSE later!! FOAM CORES FOR SAM 39 SALLIES WINGS, STAB AND In the latest SAM 39 nwesletter, as RUDDER edited by Ralph Turner, his report on FULL SIZE PLANS the La Junta SAM Champs was pretty Wingspan 100 in. much as has been outlined in the previ­ Surface area 850 in ’ ous issue, i.e., heat and rough clumps of Flying weight 60oz -144oz grass, plus a recalcitrant wind that blew L u tn l E nterprises the wrong way for two days. However,

ρ !λ B o x 1697. San Luis Obispo, Ca., 93406(805)481-0789 what was really of interest was Ed’s para­ graph as follows: “ At this point, I would like to com­ WHAT ARE THEY DOING NOW?? One thing for sure, they are a versatile ment that I do not believe that SAM With this opening, we hope to feature club! Champs or the AM A Nats either, should pictures and writeups of well-known READERS WRITE be a test of the competitors endurance. and not-so-well-known modelers who “ Who says we don’t look at your The meets should be a test of their flying have made this modeling game what it photos?” says Dr. Phil Barber of 18th skills and knowledge of the technology. should be .. . real fun!! Lilac Dr., White Rock, B.C. Canada. In a I felt that this year there could have been Photo No. 11 shows a pair of famous recent letter to this columnist, Phil says much more enjoyable sites found which modelers. On the left is Jose Elgin, well- he is not a hairsplitter (you be the judge), would have made the whole meet more known for his Cleveland Playboy design, but he feels that Photo No. 11 in the enjoyable." while on the right is Chet Lanzo, holding November 1983 “ Plug Sparks” showing The first part is what concerns the his original RC-7 radio model converted Joe Konefes’ Buzzard Bombshell as built writer. While it is great to be a winner, to a glider. Here are a couple of power by Stan Ohlsson of South Africa shows this columnist sometimes wonders why boys enjoying themselves with R/C some deficiencies that he would like to so many trophies have to be amassed by gliders. A look at the background will point out. individuals and clubs. As Ralph points tell you why . . . not that much room! “ First, the wing is not a Bombshell out, in the rush to acquire as many prizes Both Joe and Chet belong to SAM 39, wing as the span appears too great, as possible, the fun disappears under the the SAM Chapter in the Huron/Erie dihedral break of the inner panels is too tremendous pressure to win. area. Some of the members, Ralph acute, while the outer panels are just the This writer knows of no pat answer to Turner, Bucky Walter, Jim Robinson, reverse, too shallow. this problem, but eventually the meet etc., have been making the annual trek “ Second, the outstanding error is that will become another contest for the to the SAM Champs with excellent the outer panels seem to be a psuedo “ hot dogs.” We simply have to learn to results. ellipse, something the Bombshell wing enjoy ourselves with this wonderful O/T Chet won the Texaco Event in 1982 never was with its constant chord and hobby of ours or surrender it to a few. while Walter has been placing regularly horizontal wing rib type tip (similar to a STAND CORRECTED! every time. At the last champs at La Starduster). Peter Michel, 56 Lynwood Grove, Junta, Jim Robinson and Karl Emde took “ The tipoff to all of this is that the Orpington, Kent, England, membership home two trophies each in free flight. rubber bands holding down the wing do secretary for SAM 35 (England) writes to

82 MODEL BUILDER

mind that the airport was publicized as NO TIME TO BUILD? closed during that week!! TRY OUR “OLD TIME” F/F-R/C AIRCRAFT If the wind were to change and blow crosswise to both runways, this would be FULLY ASSEMBLED COMPONENTS an untenable situation for the free flighters. Scratch that field! Belote was “KLOUD KING then able to find another cow pasture serving as an airport that looked ex­ R/C REPLICA OF 1938 F/F tremely promising. Same story again!! IDEAL FOR BEGINNERS & EXPERTS No matter how little the field is used, the free flight situation can not be tolerated. Rats! There must be a lightplane for every pasture in the Midwest! • 72" Span · .29 to .40 Engine Size The only field left that will contain all • 2-3 Channel Operation, or F/F phases of Old Timer flying is Bong Field • Quality Built Components of Balsa. located in the vicinity of Racine, Wiscon­ Spruce & Ply. »Formed Spring Steel sin. Being under the jurisdiction of the Landing Gear/Tail Wheel Assembly Parks Commission, official permission (Less Wheels) had to be obtained for the last week of FULLY FRAMED - UNCOVERED June. Of course, there is a daily entrance Add $8.00 Shippmg/Handling fee for the use of the "park” . NEW! NOW IN KIT FORM WITH Carl announces this meet will be a FUSELAGE SIDES PRE BUILT four day affair beginning on Tuesday, This is a full kit All components pre-cut and concluding on Friday, June 26 to 29. Add $3.00 Shipping/Handlmg All A/C Shipped U P S Monday will be reserved for test flying, BEEHIVE R/C MODEL AIRCRAFT CO. Nole UTAH RESIDENTS MECA Grand Collectogether, if staged, ADD 5 % S A L E S T A X and, of course, the welcoming "Bean P.O. Box 744, Layton, UT 84041 Dealer Inquiries Invited Feed" on Monday night. The rest of the curricula will pretty well follow previous SAM Champs with the Annual SAM Business Meeting on Wednesday and the Victory Banquet on Friday. That should keep you boys busy! Details will follow in SAM Speaks, the EPOXY RESIN CONTINUOUS FILAMENT official SAM publication, as to events, • 526*4.6x3.7*3. · 10*510x7.11*6 ·· GIANT SIZES days, accommodations, etc. Should be a 7*4.7X63 $4.95 3 BLADE »14.96 I8X8.I8XI0 $34.96 great meet with one more day to fly! LEFT Of BIGHT HANO. • 8x4 8x6 8x8 · 12.6*6 Milit«fv 20X8.20X10 $38.95 THE WRAPUP »x4.9x6.9x7 $7.96 4 81ADE $24,95 22X8.22X10 $49.95 VORTEX TIBS AVAIL We couldn’t resist printing Photo No. • 10X4.10x6.10*8. · BITCH GAUGE · I/2A «nd g,*m sires 15 as submitted by Mitch Post of Chi­ 2 to 3 W EEK D ELIV ERY 11x6.11x7.12*4. up to 12in $29.95 straight tipand 12*6 $996 right hand only cago, Illinois. The picture shows Bob Moulton with a streamlined twin pusher, T h · , 0··Ι·Γ · Invited that is to say, all the rubber motors are 1*303·469-3928 for M.C./Vt8AAC00 enclosed in teardrop-rolled sheet tubes. PROP or «Mil C*eh,Check or M.O. to No information on performance, but it is t o t Emerald St. Srcxomfleld.Co.*0020 the writer’s recollection, having built a similar model, that the weight of the sticks, and the friction of the rubber as it DeAngelis, when he submitted the “ This caused the model to spiral all the unwinds actually detracts from the per­ Onofri design. Although this writer was way down with no damage being in­ formance to the point where the open aware of this problem, it is time to give curred upon hitting the ground. This, stick type twin pusher is a superior Barney credit where credit is due. incidentally, all occurred not more than performer. 100 feet from the original launching Main reason for showing this photo is NEW DETHERMALIZER? spot. Most days on the farm are not too to give the prospective contestant of the Received a most interesting letter exciting, but that day was one to re­ 1984 SAM Champs an idea of the terrain from Robert E. Stuhr, R.R. 1, Shelby, member!” to be found at Bong Field. Bob is stand­ Iowa 51570, wherein he describes his I know a lot of you readers have had ing on one of the old unfinished runways "new type" dethermalizer that he re­ this happen, but eleven minutes in only that are gradually becoming overgrown cently ran across. 100 feet? Wow! with volunteer wheat, grass, what have "On one of those hot, calm, summer SAM CHAMPS 1984 you. days, I decided to sacrifice my old Mini- The follow ing news may be good The area is covered with tall grass, so it Maxer for the thrill of an out of sight news to some SAM members and bad would behoove the contestant to stay flight again. So, I launched into a thermal news to others as the site of the 1984 close to his model while chasing, and to and after five minutes, the model was SAM Champs will now be Bong Field, get a good line on where it landed. No just a speck. Luckily, it fell out of the lift, Wisconsin, according to Contest Man­ cycles allowed, but autos will be permit­ but promptly caught another riser. ager Karl Spielmaker. ted on the field to retrieve models, so no "I was able to stay under the model all This writer had high hopes the site excuses, fellows! I’ll see you characters the time as the wind was very light with a would be Metcalf Field, the old munici­ there!! · resulting small drift. On the second pal airport in Toledo. Don Belote, one of thermal, I thought the model was a real the mainstays of the Toledo Weak goner this time. Now comes the strange Signals Trade Show, was responsible for Skyhawk.... Continued from page 45 part. After eleven minutes, the hot sun the initial contacts with the airport melted the adhesive of the masking operator. Just when things had started to Results: a completely friction free, tape, releasing the nose plug being held gel, the age old problem of the lone perfectly aligned servo to aileron hook­ by the tape. About four inches of slack stranger coming in on his old Taylor Cub up. rubber fell out with the propeller once a week would necessitate the Short lengths of fuel tubing were used dangling below. opening of one of the runways. Never over all clevises as added insurance that 84 MODEL BUILDER iversiug on all four main channels 1 end-point adjustments far ele­ find many of the moce experienced vator. aileron and landing gear in fivers choose Kraft for that reason. both directions, independently. It's the quality that's built into our The throttle and rudder have total systems that gives them the rugged throw adjustments. dependability to perform year The K P R 6 C receiver is our in and year out. Whether you smallest, lightest, and most re­ fly in competition or just for fJQ liable receiver ever. The receiver fun, the KPhC is designed and transmitter can be readily Γο γ precise and reliable eon- I f jdjja· converted for operation on the II trol that will last for years. fl| new frequencies. O f course, you Ilte KP6C case fits also have a wide selection of

into y our hands comfort- D Kraft, high performance, long­ ably for a positive grip. life servos to choose from. Control switches for the aux­ See and try the KP6C Gold iliary channels are located along Spectrum , at your local holihy the lop of the transmitter allow- dealer, or wrile for com­ ing you to maintain stick con­ plete information. Kraft tact while operating landing Ε Σ Systems Co., P.O. Box gear, flaps or other operating features of your aircraft. The second auxiliary channel is a linear slide potentiometer |nAa that allows precise positioning of any selected control function.

You will also find adjustable dual v& rates for aileron and elevator as w ell L . «manner* |V MOftMM h U V » H > H ^ Your next R/C project

as adjustable length sticks. - X y - v is worth it.

r — — i j HMp*qiN) ] i» *w v | L J foHCJI» 1 rw jo w »istnxau. - I

HACK PANEL DETAIL FEBRUARY 1984 WHEN CONTACTING ADVERTISERS. TELL ‘EM MODEL BUILDER SENT YOU______85 often called "CG.” It is mentioned in the instructions as being at 33% of the wing chord. With everything in place, without fuel, mine came out about 1/2- Electric Flight inch forward, close enough on a model of this design and size. Unless your radio Technology system is considerably different from the norm, yours should also balance within is Now. acceptable limits without the need of Astro Challenger Cobalt motor any weight anywhere. Should a small forward adjustment be necessary, I’d technology delivers unmatched flight per­ consider moving the battery pack out of formance. Pylon racers fly at 100 mph, Sailplanes climb over its molded cavity and up under the tank 1000 feet in one minute, and Quarter scale aircraft fly rather than add dead weight (lead) up realistically. The age of electrics has come — easy, clean, front. No engine thrust adjustments are simple and economical flying for SPORT AND COMPETITION necessary, though it would be a good in 05, 15, 25, and 40 sizes. Ask your Astro Flight Dealer for idea to check the side thrust. From a motors and complete systems or Order Direct — and join the point on the rudder to the prop tips, there should be 1/8 to 1/4-inch less QUIET REVOLUTION! distance at the right tip, looking at the Cobalt 05 . $75.00, 15 ... $100, 25 ... $125, 40 ... $150. model from the rear. If necessary, Flash! Astro cobalt 05 in “Fast Eddy" and flown by loosen the engine screws and rotate the engine as far right as it will go. This is also Larry Jolly sets electric speed record — 92.85 mph a good time to install the muffler exten­ two-way average (Subject to FAI confirmation.) sion and muffler, per the instructions. A small drop of thread sealant on each nSTRO FLIGHT IRC. screw (such as Pacer’s Zap-Lock) will insure you against playing “ bomber” 13311 Beach Ave. · Marina Del Rey, CA · 90292 · (213) 821-6242 with your muffler sometime during your flying. Thread sealant should also be used on TAKE IT OFF WITH the main gear axle screws. A short length SPEED STIX of 5/32 OD tubing for a bushing is needed on the nose wheel. A flat spot DISPOSABLE SANDING TOOLS filed or ground on the wire axle there USE WET OR DRY will keep the wheel collar screw from 3 SANDING GRADES: 100 - 120 - 180 loosening. FLYING REGULAR SPEED STIX Light and big means a tendency to A * $4.85 9 STIX (1/4-3/8-1/2 diameter) weathervane on takeoff if there is any MINI SPEED STIX breeze at all. Other than that, flying the B * $2.95 6 STIX (1/8-3/16-1/4 diameter) MRC Cessna requires nothing other than a fine touch on the sticks. With the NEW! FLAT STIX controls set up as recommended in the PRECISION SANDING TOOLS C * $3.75 6 Wedge STIX (3/4-1/2-1/4 width) instructions, the model is agile enough 2930 SKYVIEW AVENUE to allow overcontrolling, without being ORDER TODAY!! POSTPAID!! PUEBLO. CO 81008 unacceptably sensitive. It’ll do the basic (DEALER INQUIRIES INVITED) Evenings call (303) 542-6200 maneuvers with ease, and landings are a cinch, positive all the waytothe ground, with no tendency to snap or stall. they wouldn’t pop loose at some inop­ it out, no matter how much flying you That long wing is apparently stronger portune time. do. than it seems, but if you decide to ENGINE CONSTRUCTION HINTS increase the control throws for more The extremely light weight of the The instructions are a happy combina­ violent maneuvers, a lengthwise strap of model means that an expensive, high tion .. . thorough, without being wordy. filament tape on the underside for revving, fire snorting engine is not I can only add a couple of suggestions. added strength would not be a bad idea. required. In fact, the MRC Cessna uses a First, the all important center wing joint. It’ll take you longer to charge the rather humble, lapped piston Enya .35. The procedure as outlined by MRC batteries than it will to get the MRC This relatively small engine, swinging a works, except that I believe a better Cessna Skyhawk II ready for flight. And 11-5 prop puls the Cessna with authority foam-to-foam joint will result if the flight is exactly what you will get out of it, . . . no VTOs, but neither does it require molded surfaces are sanded. Better glue and after all, that’s what the hobby is all that you dive to get up enough steam for penetration should result on the sanded about, isn’t it? · a realistic loop or roll. porous surfaces than on the smooth The Enya .35 comes with the MRC molded surfaces. So, sand the wing Skyhawk II and with instructions pro­ centers, test for fit and dihedral, and Cracker Jack .. Continued from page 49 vided by the Enya company, plus some follow the rest of the instructions. operating hints by MRC. It is somewhat After the wing is complete, don’t reminiscent of the old Veco .45, which forget the step that is important to all radius, kinks are a real “ no-no” . To early R/Cers will remember as the models, the lateral balance. If necessary, prevent the tubing from fatiguing due to engine. It also used sleeve bearings, no add weight to the light wing tip until the vibration, tie it down from place to place rings, and it took a week’s production of wing remains level when supported in with silicone bathtub sealer. Tie the aft K&B 500 to get it broken in, but once the center (longitudinal axis). This will end of the tank to the fuselage bottom there, it ran its heart out for you, fast, keep you from having to fly around with with sealer also. Don’t forget to balance slow, or in between. Break this Enya in as a lot of drag producing trim cranked in. your propeller to reduce the level of recommended, always treat it properly, This is also a good time to check the engine vibration. and I doubt if you’ll ever beabletowear model for its proper balance point, The cabane struts are pointed and 86 MODEL BUILDER pushed into the balsa structure of the wing and fuselage. Do this carefully so • 6 CHANNEL RECEIVER* that the wing is properly aligned. • 4 MIDGET SERVOS (NES-1 A) The side and bottom fuselagestringers (for the large model) are 1/16 x 1/8 balsa • 500 MAH SQ. BATT (SANYO) N o v a k sticks. They are mounted on edge, are • AILERON EXTENSION ELECTRONICS full-depth at the location of the wing • MINI SWITCH HARNESS strut, and smoothly taper to nothing forward and aft of this point. Covering follows standard proce­ dures. Cover the entire model with white tissue, and after it has been water shrunk, give it about three coats of thin dope. The color trim is put on using colored tissue doped on over the base white tissue. The Sailor and his dog are an intricate pattern to cut out of tissue. Their dark parts are blue. Use a thin pen for the Cracker Jack box he is holding in his hand. The following adjustments are made for flying the model. Make sure the model balances level when supported at the extreme wingtips. Mine needed Futaba/compatible plugs. Matches all modern TX. Plug-in crystal included. some weight added at the tail end. ^Specify Frequency. Add $2.50 UPS, Celil, residents, add 6%. Allow 3-4 w e e k s tor Remove any gross warps in the wings or checks Send 9Ά x 11 'h SA SE tor tree brochure tail and make sure each wing has about 2709-C Orange Avenue, Santa Ana, CA 92707, (714) 549-3741 an eighth of an inch of washout. Test glide the model to determine if some right circles. The model hops off in elevator and rudder adjustments are about three or four inches and pulls up required. Try for a straight .smooth glide. into a fast, steep climb for about the first Until the original model had the ta b u ­ 40 seconds of flight. After this the model lator strips added, it glided very poorly. gradually levels off and a short time later Adjust your engine for fairly low RPM goes into its glide. Immediately after the and try a flight. The original model takeoff, the model starts a right circle PERFORMANCE! tended to spiral in to the left and and continues through the flight and CHAMPION RUBBER required some right rudder to overcome glide. For maximum flights, about 650 this tendency. The right rudder will give turns can be stored in a motor with two %. y,6 & V, Widths. .040 Thick you a right turn in the glide. Ifsavingthe inches slack. $12.95 LB.* model from a left spiral dive under As usual, when researching one of See your hobby dealer power with the rudder results in a right these OT's, I start wandering through or order direct P P D spiral dive in the glide, you will have to the other pages of the particular issue CHAMPION MODEL PRODUCTS 880 CARMEN COURT resort to some right thrust adjustment. involved, and interesting things reap­ LA VERNE. CA 91750 Side windows (non-scale) or a profile pear. In this one, the 1937 Nationals (714) 599-3348 pilot in the cockpit will probably reduce were described, and the results posted Inctuú«» U S delivery via U P S the model’s tendency to spiral. Have fun (there were only 17 events altogether). Cal«» revdont» add 6% u le i ta* with your Cracker Jack! · Many familiar names were in the lists, but we’ll mention a few who most your wife) a Diamond for her next everyone should recognize. F’rinstance, birthday. Just think of the fun she'll have Diam ond .... Continued from page 38 in Outdoor Open Class Cabin, Dick retrieving it while you fly it for her! · Korda was first with 54:13, the next closest being a C. Sholes at 2:39.8! Chet the incidence of the wing rather than Lanzo and Frank Zaic appeared in 9th Volts Wagon .. Continued from page 28 resort to any great change in the position and 5th respectively. In Senior Mulvihill, of the wing. The usual incidence used is There was Earl Stahl (6th), Dick Everett thing, send for the plans immediately raising the leading edge 1/8-inch above (7th), Wally (K&S) Simmers (8th), Mike before the rush commences. Even with the trailing edge. The center of gravity Roll and Hewitt Phillips. should be at the center of the wing. How about Indoor Stick Senior? Wally the best of service, it’ll take Model Start the power flights only after the Simmers again, in first. Hewitt Phillips Builder a week or two to get them into glide is satisfactory. Try about TOO turns (6th), Sid Axelrod (12th). Indoor Stick your hands. (Include First Class postage for the first flight. Then increase the Open? Carl Goldberg was second, and for the fastest return, wrf) That’s OK, number of turns to about 250. Bad one Walt Good (!) was in 6th. Yes, and because you have some homework to adjustments will be revealed during a Walt was also 9th in Indoor Cabin. How do: while you’re waiting, go back flight under this amount of power. about that!? In Gas Model Open, Max­ through all your back issues of MB for Correct any stalling tendency by in­ well Bassett was first, with Carl Goldberg 1983, starting with December, then creasing the negative thrust. This is in 2nd. In Gas Model Senior, we see Fisk November, etc., and read each of Mitch conveniently done by changing the Hanley in first, Sid Axelrod (Top Flite's Poling’s columns until you've read angle of the nose block. Insert small leader for many years) in 7th place, Bob everything from 1983. When you're slivers of balsa between the top of the Long (Long Cabin), Chuck Tracy, current done with that, find everything you can block and the first fuselage cross brace. Sam President Mike Granier, Vern Kreh- by Larry Jolly (also in MB). You’ll have to Cement these blocks to the nosing as biel (VK Models), and Hewitt Phillips. read his stuff twice, or however many soon as you are satisfied with the adjust­ And in Radio Control, from 1st to 6th times it takes you to understand it. His ment. place, it was Chet Lanzo, Pat Sweeney, E. literary style is a bit quirky, but it is worth About two degrees downthrust and Wasman, Walt Good, Leo Weiss, and B. the e ffo rt. . . he knows what he’s talking one degree right thrust are used on the Schiffman. about! Diamond. The rudder is given a slight Hey, great idea! Why don’t you build If the plans still are not back, go back turn to the right and the model flies in your wife or girlfriend (who may also be to 1982 and read Poling’s columns for

FEBRUARY 1984 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 87 Leisure Digital at the field. I don’t know r RELIABLE ENGINES ^ how I’d get by without them. AT FIELD CHARGING BATTERIES NEW! REASONABLE PRICES Most R/Cers are using field batteries fr o m / ------\ of four and a half to six ampere-hour Midwest Model is the source for: capacity for use with their power panels. A m e r ic a n . These batteries are totally inadequate ju n io r • IRVINE ENGINES FROM ENGLAND for our purposes. What is needed is a • H.P. ENGINES FROM AUSTRIA battery of not less than 14 ampere-hour • COMPLETE STOCK OF SPARE PARTS capacity. They are available through • COMPLETE SERVICE FACILITY motorcycle shops, and places that cater to recreational vehicles. Usually, they V Dealer Inquires Invited J can be found for about $35. WRITEWRIl OR CALL FOR MORE INFORMATION How do you charge this battery? Run a MIDWEST MODEL line from your auto battery, and charge 3 H 2 2 SE · it as you drive to and from the field. SOI M IP AOMEOVIIU A *0441 I*v> What could be easier. .. and the price is right. By the way, this will not be a nice, clean, sealed, gel-cell type. It will be an (longer flights) because of their greater old-fashioned wet cell battery that can capacity and superior charge and dis­ and will leak acid. Nothing is perfect. Put charge characteristics. Don’t fool with the battery in a wooden box or con­ anything else. If you’ve got some of tainer, and keep everything of value $9.95 those older GE eight-cell packs (white), away from it. This is a minor inconven­ they make terrific flight packs for your ience, considering the long lasting job Ä 3 5 : receiver and servos when broken down this battery will do for you. S k s s k £ 1 into two sets of four. If you do not want to go to theexpense been responsible for getting No less important is the new genera­ and trouble of buying the above men­ tion of motors beginning with Leisure’s m^onsoi kids into the hobby tioned battery, nothing is better than the Whip-Power planes devel- terrific LT-50 and Astro’s very competi­ battery in the vehicle that transports you åreetheyPlhe la,e J'm Walker. tive 05XL and 07XL .. . both became to and from the flying site ... your car. folearn r/i'en' 3nd Sa,est waV generally available about two years ago. An auto battery is usually 70 ampere C/L flyin9- N° messy Since then, we have had access to the hours or larger and is always charged up coicourage S ?kids ' "or 9parents. props ,0 Just dis- a fantastic Astro Cobalts, and more re­ and ready to deliver. Please don’t try to ar ,,s^ 'n9 rod or bamboo cently, the imported German Kellers charge through the cigarette lighter pole provides the power to (cobalt) made available by Leisure. The receptacle. If anyone in the family perform loops, wing-overs lastest entries in this race for excellence smokes, you've got all kinds of resis­ and inverted flight. Develops are Astro’s line of Super Ferrites (it is the basic aerobatic skills and tance, and who knows how many feet of simple modeling techniques first day of November, 1983, as I write wire lie between the receptacle and the quietly and safely this, and who knows what will have battery adding still more resistance. Just When you're ready for developed by the time you read this). release the hood and clip the charger powered flight, try the Fire- These new motors are more expensive directly to the battery (following the baby II (19-1/2 In. wing) or the than earlier ones; most of them were in manfaucturer’s instructions) being very Jr. Fireball (24 in. wing) Both the $12 to $15 range three years ago, of these dynamite models use careful to observe correct polarity. I use any standard .049 engine with plain bearings and limited perfor­ this technique frequently enough to See your dealer and ASK mance . . . a far cry from the new breed justify running a permanent plug from FOR THE AMERICAN which cost from around $30 to $50 for the battery exiting the engine compart­ JUNIORS! the non-cobalts, to as much as $200 for ment in a convenient place so that I the largest cobalts. As with everything don’t even have to raise the hood. American Junior else, you pay for performance. Heritage Models, Inc. PROPELLERS P.O. Box 505 CHARGERS AND CHARGING The choice of props for electric pow­ Donald, OR 97020 We now know a lot more about this ered aircraft is somewhat more critical (503) 370-7558 subject. For a long time we didn’t than is the case with glow engines. I’ve understand that it was impossible to fast done a considerable amount of bench If not available, order direct Check money order. Visa/Master- charge an eight-cell pack from a twelve- testing, and while the results are useful Card. please Add $2.00 for volt source . . . so 90% of the time we for comparison, it isn’t until you get into handling and postage were trying to fly on 80% of a charge theairthatyou really KNOWwhatworks when 100% would have been barely best on what motor and what aircraft. that year. Don’t bother to dig back any enough with these old 550 mah packs we This is because the engine/prop combi­ further than that . . . you’ll be more were using! The switch to six-packs nations “ unload” once airborne. Much confused than enlightened by what you (even seven-packs with special care) of this is caused by airspeed and load. find. So much has changed (for the solved that. The availability of a variety I can tell you one thing: Rev-Up props better) in the past two years that most of of good chargers serves our needs work best! I don't really know why. I’ve the opinions, equipment and attitudes nicely. At the top of my list of chargers is had good flights with Top Flights and of that period are grossly antiquated. Astro’s AC/DC Auto Charger ($70). It Zingers but my most spectacular flights You are entering the Golden Era of has, among other important features, are always on Rev-Ups. I keep tight logs electric power! voltmeter jacks so that you can plug in a on all my flights so this is not just a gut Just what has changed to make our life $50 digital or $8 analog type voltmeter feeling, it’s clearly borne out in my as electro-fliers so wonderful? Primarily, (both available from Radio Shack). written observations. With the circula­ it was the abandonment of the eight- Nearly as useful as Leisure’s Digital tion of MB being what it is, I’ve probably cell/550 mah GE Ni-Cd battery pack Charger at $100. You can get by for as started a world-wide shortage of Rev- which was the ‘‘standard’’ of the last little as $25 (both Astro and Leisure have Ups. Please Mr. Rev-Up, make more 7-4s decade. In its place emerged the key to models in this price range), but do and 8-4s. Those are the two fans that I duration and successful charging, the yourself a favor and go for the best in this find most consistently useful. Start with six-cell (and seven-cell) 1200 mah battery department, you’ll not regret it. I have the 7-4 then move up to the 8-4. packs. These yellow marvels have simply both of these chargers. I use the Astro CONSTRUCTION given u s dramatically improved duration AC/DC unit mostly in the shop, and the So, you thought this was going to be a MODEL BUILDER 88 construction article? So far I’ve said nothing about construction. Have you Get Electrified — at TOiUAvtef ever built a rubber model or a sailplane? If you have you’ll need few comments Geist — World-Leading, from me. If you haven’t, I’ve probably German high technology wasted your time so far with all this stuff about electro-flight. However, I do have electric components a couple of building tips before going • Geist Samarium Cobalt motors back to the good stuff. and flight systems (with slip-on The fuselage sides are simply made rings for more power durationl) from 1/16 balsa sheeting, four inches • Geist Electronic Speed Controls wide. With a ballpoint pen draw the • Geist Fiberglass Folding Props fuselage outline on the balsa; all the • Geist Electronic On/Off Switches lines are straight, except the bottom of • Geist Battery Chargers the nose . . . you can eyeball that. The doublers, longerons, and vertical pieces • Geist "Hot Dog" and are cemented to the sides (be sure to "Hot River" Aircraft make a LEFT and RIGHT side). When dry, Contact Wllshlre for all electric assemble the fuselage using Formers B ^flight components! and C for alignment. When the two sides Catalogs - Sailplane S2.50 (joined by the formers) are dry, draw the Electric . $2.00 sides together at the tail, fill in the fuselage with the crosspieces, etc. The tail is standard “ free flight," you’ll wilshire model center have no trouble there. m 3006 Wilshire Blvd. · Santa Monica. CA · Ä f i The wing construction is typical of all ■ 90403 · Phone (213) 828-9362 my designs in that the main spar is built RC Sailplane and Electric Power specialists lor the U S A over the plans, dihedral braces and all. When dry, position the spar over the as many motors as possible, including plans, center section first. This leaves the some gear-drives. We did quite a bit of two outboard spars sticking up in the air. testing with direct-drives, but had not When the center section is complete, tip gotten into the gear-drives as time was it first to one side, built that panel, then running out. For this reason, Jim Hall, tip it to the other side and build that who built the first VW from the final panel. Simple isn’t it . . . no panels to join plans, modified the front end of his VW World War I isn't Quite Over Yet! later, and no chance of getting the to take a Leisure LT-50 with a 2.5 to 1 “EINDECKER" E-Ill $39 95 dihedral wrong. I’m surprised more gear-drive. We didn’t do enough testing N Y lesments add I'. Pi·»*« Include S2.00 Potteg# & Handling designers haven't discovered this trick. to completely satisfy me, however, I 55 Wing&pon For .35 to .45 Engines Oh well! must say that the VW did so well on Balsa & Plywood Construction I covered the fuselage with medium EVERY direct-drive motor we tested that Morane “SAULNIER” N weight silkspan, three coats of Sig clear it overshadowed the gear-drives. My Beautiful new production tots of oHJ favorite* You ti like the rugged construction tit ot the die Cut parts Both have dope, and snot some Sig Cub Yellow on impression is that in a plane of this SIZE, a nmtory of eon’est w ins Easy to build, su p e 'b m flight· it. The wing and tail group are covered the gear-drive provides no clear advan­ 3-4 Channel R/C InduO. 17 0 0 P»og· * Harwl.ng with white and yellow Monokote. So tage. The VWflew on a Rev-Up ll-5,then D eel* inquiries Invited N v resHJenis *y\ T·,- $37.95 much for construction. a II-7, and finally a 12-5, with the II-7 FLYING being the best performer. Even with the Nick Ziroli Models Normally, I hand launch my electrics very long landing gear legs, the gear- 29 Edgar Drive. Smithtown, N.Y. 11787 as my flying is done at the Sepulveda drive was very vulnerable to damage on final tests were conducted using the Basin flying site in Van Nuys, California, a hard landing. Astro Super Ferrite 05 (six cells) and the where the majority of other aircraft are Conclusion: The added weight, ex­ Super Ferrite 075 (seven cells) which much faster than mine, and it is expedi­ pense and aggravation of the gear and proved to be outstanding units which I tious to quickly get-the-hell-out-of-the- belt-drives brought nothing of value in recommend highly (also they’re quite way . . . or get run over! performance. I suspect if the VW was inexpensive). The VW takes off quite nicely. Even 20% larger, we would have done much The final flight test was made with though it’s a taildragger, it sits at a very better. So stick with the direct-drives Astro’s sensational new Super Ferrite 10 "flat” attitude, so that taking off is just a and save that gear-drive for a bigger (seven cells) which looks exactly like a matter of rolling twenty-five to fifty feet airframe. Cobalt 15 minus thebig"knobs."Though (depending on the breeze) and easing Back to Jim Hall . . . I got a set of final this motor weighs three ounces more back on the stick. plans on a Saturday morning (from Vic than the others tested, it produced the If you decide to hand launch, be sure Steelhammer who drew them), and most spectacular results! This jewel to toss it at a perfectly flat attitude or gave them to Jim so that he could tell me turns just over 14,000 rpm on a Rev-Up even a tad nose down. Under no circum­ if there were any mistakes or parts that 7-4 on the bench tests . . . lord knows stances should you allow the nose to be don't fit. Apparently everything was OK, what it unloads to in the air! In any case, raised . . . remember the warning about as he simply showed up at the field the its performance is very close to that of a dropping a wing? following Saturday . .. one week later Cobalt, it weighs a little more than a The VW has a very flat glide, so that . . . ready to fly! I must add that Jim is Cobalt of similar output, however, it landings may bemadesimply by steering NOT retired, was not on vacation, and uses far fewer cells, and it costs less. down final with no need for a flare-out. in fact, is a very busy person. So, ob­ There is a big future for this one! However, you will have eased in full UP viously, the VWcan be built very quickly. While I'm on the subject of praising TRIM after shutting the motor down. If On a project like this, data never stops the people who make our success pos­ trimmed and balanced correctly, this coming in, but, you have to draw the line sible, I must say that Bill Cannon (Can­ produces optimum glide and the íowest somewhere. So, as of Sunday, October non R/C Systems) does NOT get enough sink rate. 30th, 1983, we made the final tests (so far credit for his pioneering of mini and ELECTRIC MOTOR TESTS: as this article is concerned). Thanks to micro systems. All of my electrics fly with GEARS, BELTS, AND DIRECT-DRIVES Bob Boucher’s (Astro Flight) interest in Cannons on board. You may also have Before unleashing this subject on an our flight tests, we were fortunate noticed that virtually all the record unsuspecting world, we wanted to test enough to have two new motors. So, the attempts have used Cannons. Until

FE BR U A R Y 1984 WHEN CONTACTING ADVERTISERS, TELL ‘EM MODEL BUILDER SENT YOU! 89 your brain from mph to kph, and I believe it will be extremely interesting to Hi- know what my FK-50/CAP-20 is really doing up there. so uthern PRO RETRACTS WING HOLD-DOWNS Naturally, the wing is bolted on as rubber bands went out with escape­ ments. I used a neat new wing bolt sys­ tem recently made available by Sonic- Tronics, called a “ Nifty” Wing Mounting SERVO Formerly: Kit. It consists of nylon bolts, brass PRO-LINE threaded inserts, and some recessed ACTUATED nylon guides for the bolts. These guides FOR and are installed in lengths of one-inch out­ side diameter dowels, which in turn are RELIABILITY SOUTHERN R/C glued into wing cores. The bottom of the dowel is flush with the underside of the wing, and the top of the nylon guide is down the proper distance to recess the head of the bolt being used. After the "IF THE RADIO WORKS THE LANDING GEAR WORKS, IF THE RADIO OOESN7 WORK, IT DOESN'T MATTER" first epoxy sets, fill the cavity around the guide with some of Dave's epoxy and SEE YOUR DEALER OR DISTRIBUTOR micro-balloons, and sand the whole thing flush. A couple of layers of heavy DAVE BROWN PRODUCTS fiberglass cloth should be used as a re­ 4560 LAYHIGH RD.. HAMILTON. OHIO 45013 Ph. (513) 738-1576 inforcement on the bottom side of the wing. The threaded inserts are screwed into some hardwood attached to the fuselage sides. The results are an accu­ rate, strong, and clean appearing wing mount. WHEELS JOHN POND For something that is used for such a short percentage of the time, those wheels sure are important, aren't they? Old Time Plan Service They are important in many respects . . . The largest selection of plans in the world at the most weight being one of them . . . and this is I / reasonable prices. Each list $ 1.00 the primary reason for my choice of the L All 4 for $3.00 \ \ Powermax wheels which I am using. They look not unlike many other wheels No. 14 OLD TIMER F/F GAS on the market, gray hubs, black tires, but No. 14 OLD TIMER RUBBER/TOWLINE it isn’t until you have a pair in your hand No. 14 OLD TIMER FLYING SCALE A through K that you realizethereissomethingreally different about them, they are light. A No. 14 OLD TIMER FLYING SCALE L through Z pair of 4-inch wheels (unfortunately the New plans prices ef fective Dec. I983 to Dec. 1984 largest size now available) weigh a hair P. O. Box 3215 over four ounces. They are made in San Jose, Calif. 95156 seven sizes from two to four inch, at from $2.25 to $6.50 per pair. You’ll want Phone (408) 292-3382 to try them on some of your smaller birds. For information about them, and recently, they were simply the ONLY many other items of European origin, radios light enough and RELIABLE Etoy's...... Continued from page 34 contact Powermax, 359 Trousdale Dr., enough for our needs. Though there are Suite A, Chula Vista, CA 92010, (619) other choices available today, I still use 691-0780. Cannons. flown in this airplane, is a Tele-Tachom­ PROP BALANCER By the way, I still have a couple of glow eter as available from Condor Hobbies. Balancing that piece of maple that we engines left and several dozen industrial This is a telemetry device, which gives bolt on to the front ends of our engines grade oil rags. . . anybody interested? I you airborne engine speed up to 30,000, is very im portant. . . even more so when have no further need of them. · and airspeed up to 300 kilometers (180 they get to be the size of those used on MPH). It consists of a small, servo-sized models of this magnitude. Even spinners transmitter, a pair of optical sensors, and and backplates should getthetreatment, VOLTS W AGON List of Materials: a ground receiving unit which at first which is all made easier and more accu­ QTY DESCRIPTION (DIMENSIONS IN INCHES) glance you would take to be a regular rate with the High Point Balancer. This 4 1/16x3x36 Medium balsa (ribs and fuselage top tachometer. You can read either of the one is different . . . it uses two freely and bottom). mentioned information by plugging in moving metal discs as a pivot for each 2 1/16x4x36 Medium balsa (fuse sides). the proper sensor, or if you prefer, you side of a shaft on which the item to be 2 3/32x2x36 Hard balsa (wing trailing edge). can switch from one to the other while balanced is mounted. Little if any friction 1 1/8x4x36 Medium balsa (doublers and misc.) airborne by installing a servo operated is present, and the heavy side immedi­ 2 1/4x1/4x36 Hard balsa (wing leading edge). 10 3/16x3/16x36 (Spars and tail). switch. I have no figures at this lime on ately and definitely starts down. What­ 1 3/16x3/8x36 (Tail). this airplane/engine combination, as I ever is being balanced is mounted onto 4 1/8x1/4x36 (Fuselage longerons). have not yet flown it with the Tele-Tach the shaft with a centering cone which 2 3/16x3/8x36 Hard and straight (wing main spars). installed, but I have done extensive accommodates center diameters of 1 3/16x3/8x36 Spruce. flying of the system with my old Tele­ from 1/8 to 3/8 in. To further ease the 1/8 Lite Ply (formers). 1/8 Regular ply (Former A). master which tears through the air at an load of the large airplane fan, High Point 1 1/8 Music wire (landing gear). unbelievable 32 mph. The system works also offers a set of extensions on which 2 1-3/4 Wheels (as light as possible). well, requiring only the recalibration of the balancer may be mounted to accept

90 MODEL BUILDER those larger pieces of maple. If not avail­ able locally, check with High Point Products, 3013 Mary Kay Lane,Glenview, IL 60025, (312) 272-8684. INSTRUMENTS Well I didn't get to use them, but I also located a very nice set of scale instru­ Flex-I-Grit: A tough, ments, available in 1/4 and 1/3-scale new sanding film bonded size. They come from the same friendly to polyester. Won't crack, folks who brought us the control cable peel, clog, scratch or assemblies, International R/C Special­ break-down. Can be ties. These instruments are not merely used wet or dry. Re- stick-ons, they have plastic covers, useable. Outlasts ordi­ bezels, and accurate, realistic, and nary sandpaper. Assort­ cleanly reproduced faces. A complete ed grits available in gar­ set, with your choice of 30 different net, aluminum oxide and silicon carbide. Send 25 instruments, is priced at $9.95, plus 50c cents for catalog and postage. price list. K & S Engi­ I couldn’t use them because the neering, 6917 W. 59th molded cockpit on the CAP-20 is too sanding St., Chicago, Illinois shallow, and doesn’t have enough depth film 60638. Telephone: 312/ for a proper instrument panel. Modify­ 586-8503. ing it would have resulted in more of a weight increase than I could accept . . . however, these instruments are defi­ nitely going into a future project. MISCELLANEOUS Like all files, all articles have to have a miscellaneous section! This one deals with nylon screws, which we all know seat sounds like a terrible chore, I know, about and which the more enlightened but actually, it takes longer to get ones of us used to hold wings on with. mentally prepared to do it, than it does What is not as well-known is that they to actually remove the four, half-inch come in all sizes, and in some variety of nuts and lift the seat out. I pass this along colors. On the CAP-20, I used them to as a possible solution to those of you hold the cowling and the canopy, in with similar problems and vehicles. both cases being screwed into blind nuts A two-way stand was also fabricated. A set into small pieces of Lite Ply. I like In this case, it is a couple of L-shaped them for a number of reasons, one of supports, with U-shaped cutouts in both T é T é s t r r á them being the lightness, and the other legs, to fit and support the fuselage at CORPORATION one being shear strength, which is more the front and rear. The short leg of the L than enough for this application. supports the fuselage during storage at Another reason is the visibility, or more home and while it is being transported, accurately, the lack of it. To hold the the longer L supports it upside down for BUILD YOUR canopy, I used black screws, all installed wing installation and preflight. Mine is fl along the black painted canopy border. made of 3/4-inch chipboard, but any OWN ROCKET They are so invisible that I’ve had ques­ similar material will do. the dimensions tions as to how thecanopy isheldoniTo being dictated by the shape of your MOTORS! hold the yellow cowling, I used the off- model and the height necessary to pro­ WE CAN SHOW YOU HOW! white which is the natural color of nylon. vide clearance. II Though not as invisible as black on FLYING black, they still do notstand out as much Came the day of reckoning, getting • 40 POUNDS as shiny plated screws. the CAP-20 out to the field was a problem Another nice, related item is nylon that could only be solved by taking the THRUST! washers, also available in all sizes. They co-pilot’s seat out of the Bobcat, and A are a must under metal screws (when putting in the plywood platform. Then, • 50C EACH! you have to use them) which bear down at the field it was time to: check the • With a lock tumblei and some simple haml tools on painted surfaces. These nylon washers controls, range check, run the engine, well show you how to build YOUR OWN lockel completely eliminate the paint scratch­ set the idle, range check, check the con­ engines in youi own gaiage or woikshop fot 1 '5 to ing that invariably takes place when the trols, taxi, high speed taxi, let's fly! Lots 1/10 the cost ot the commercially marketed motots screw is first tightened, and which gets • INTERESTED? Just send us S2 00 and we ll mail you of torque, not enough rudder, over con­ oui brochure along with a WORKING SAMPLE ot an worse everytime it is removed and re­ trol, not straight but acceptable, lift-off, electric igniter that YOU CAN M A K E YOURSELF trom installed. Both nylon screws and washers altitude, trim: needs no pitch correction, materials you II tmd around the house TELL YOUR FRIENOS ABOUT US! We re the 00 IT are standard items at electronic supply slight touch of left, breathe! The BIG YOURSELF ROCKET people houses, in sizes from No. 2 to No. 10. Bird is in the air, the engine sounds Transporting and handling a model good, it has good control response . . . Write to Department MB 3. The Teleflite Corporation 11620 Kitching St.. Sunnymead. CA 92388 the size of this one presents its own type what a sight . . . maneuvers . . . I’m re­ of problems, especially to those of us hooked. without vans, RVs, or similar. In my case, I can get along without the 90-pound I am limited to a Mercury Bobcat, better monsters, but piloting a large model known as a Ford Pinto. It has more room such as this one definitely approaches inside than any other back-opening full-scale flying more so than flying a S o a r in g ...... Continued from page 42 small car, but still not enough for this little one. Who was it that first said, aircraft. However, the problem is easily "Large models fly, small models flit” ? Avg. ch ord 145 m m 5.7 in solved by removing the co-pilot’s seat, Amen! · Area 3 dm- 46 in2 and putting in a light plywood shelf Airfoil: NACA 63A008 made just to fit that space. Removing the Moment arm 800 mm 31 in

FEBRUARY 1984 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 91 parameters. One, or at most two nor­ malized airfoil/chord-line tables are DALOTEL - TIPORARE — C.A.P.21 required. Further, if you calculate the 750 difference between an elliptical curve and Eppler's thickness curve between 825 the leading edge and the point of maximum thickness (for a symmetrical airfoil), they are very close .. . close enough for most builders. "My recent ship uses a 127» thick, two percent camber, 11-inch root chord AMA or FAI wing with a nine percent thick. 4-1/2 COMPETITIVE AIRFRAMES OUR DESIGNS ARE IN percent camber, eight-inch tip . . . with lo r THE WINNERS CIRCLE Eppler shape. PATTERN FLYERS 1978 - 1983 "This differs from Bannister’s ap­ KITS OR AIRFRAMES DICK HANSON MODELS proach as he relies on a thicker tip BUILT TO ORDER 5269 LUCKY CLOVER LANE section to avoid tip stall, while I have WRITE OR CALL MURRAY. UTAH 84107 used a thinner, but more heavily cam­ FOR INFORMATION PHONE (801) 261-1402 bered tip section for the same reason, but with the advantage of reduced drag and lower weight, plus smaller axial moment of inertia by tapering the wing's weight per unit area toward the tip. I believe that my approach is technically far superior. “ However, as I am a duffer of a flier, I could never realize any advantage. I feel very fortunate to survive flights, let alone compete. "I have written a routine fora Hewlett- Packard computer to generate airfoils. Do you and your associates have any interest?” Daryl enclosed a computer-drawn set of “ ribs” (airfoil shapes) for an ellip- tically tapered wing using the above mentioned transition of airfoils. As there are 14 of them, the set would be enough for a two-meter glider with 2-3/4-inch rib spacing . . . hmmmm. It would seem to me (I speak not as an aerodynamicist here) that to minimize from somewhere a lot closer than Nor­ induced drag, you would want to get as , SCALE DOCUMENTATION 7 way . . . A Mr. Daryl T. Butcher, of La close to an elliptical lift distribution as SCALE ORAWINGS MODEL PLANS Habra, California, wrote in back of May you could along the span of the wing. An a Æ / j boOKSS of last year (I’ve been waiting for an elliptically shaped wing will accomplish opportunity to run his letter, and it’s this IF the airfoil remains the same along yREPL A-TECH taken this long!) describing how he has the span. If you increase the camber 1984 AIRPL/foE J 11NTERNATIONAL CATALOG 48500 MC KENZIE HWY. developed a rather unusual R/C sail­ toward the tip, I would think this would S3.00 VIDA. OREGON 97488 plane. His letter is self-explanatory: be undesirable . .. unless you are prone "I read the recent article describing to tip stalling an airplane. In that case, TOTAL AIRCRAFT: Sean Bannister’s Alegbra VIII (May 1983 the increase in drag caused by the W eight 2000 to 4200 g 70 to 148 oz MB) with considerable interest as I have increase in camber near the tip will be W ing Loading 34-71 g/dm -' 11-23 o e /h ‘ also designed and have been flying a more than offset by the airplane’s Included with the information pack­ glider with tapered airfoils based on resistance to tip stalling. age that Hans Peter sent to me from the Eppler series. It seems that the Eppler Thorbjoern was a glide polar compari­ The bottom line is how does it work numbered airfoils are nearly a religion in son for the KITTdesign using the Epplers for you? In the case of the U4EA83, the soaring fraternity. The mysterious 193, 205, and 212: the lift/drag profile Daryl’s new glider, it works great! He numbering system is part of the cult. polars of the Epplers 193, 205, 211, and claims a very broad speed range, plenty 374 superimposed on each other; and a “ I call to your attention the article by of penetration, and overall good per­ nice three-view of the KITT-193. With all Eric Lister. Do It Yourself Airfoil Design formance. Besides, he is experiencing of the foregoing data, which may seem a from the Eppler Series,’ starting on page the high that few kit builders ever see, little overwhelming (it’s not really), 62 of the February 1981 RC Modeler. that of taking of chance . . . a gamble of including the three-view on the second Lister provides data on the airfoil (thick­ time and energy . . . designing some­ page of this article, and the photo­ ness) and camber shape of the Eppler thing literally from the ground up, graphs of the actual KITT models, we series, and relates these curves to the totally different, and succeeding with it! have enough information to make simi­ NACA numbering convention. Believe My hat is off to you, Daryl. lar models, if not identical ones. me, this approach results in airfoils To wrap things up with this subject, I As I said in my December article on which are as close to the coordinates spoke with Daryl recently, and he the Worlds, this model would make a which have been published in several agreed to furnish me with a hard copy of fantastic AMA thermal duration glider magazines as can be built. In fact, any his H-P computer program. If anyone or F3B/multi-task glider. When I get the differences can be ascribed to the use of would like to have this program, he or time to build one. . . (sung to the tune of only three significant digits in the she can send mean SASE and a 20

FE B R U A R Y 1984 WHEN CONTACTING ADVERTISERS, TELL ‘EM MODEL BUILDER SENT YOU! 93 batic model aircraft to fly full-scale in putting the flying back in the pilot’s BIG BEAUTIFUL BOAT aerobatic maneuvers, Hanno came up hands, where it should be. with a large, lightweight scale model The idea is not new. As long as ten that flew at scale speeds, while the years ago, I was discussing the problem others flew pattern-size scale ships that with Phil Kraft. His point was much the flew like pattern planes. Two years later, same then, as auxiliary buttons were the “ followers” joined the "leader.” beginning to appear, retracts were a At this year’s World Championships, necessity, and engine horsepower was J-5 HYDRO UNLIMITED the rules didn’t call for any change in the increasing. The average aerobatic flier 7-toot long by 3-foot beam mahogany plywood boat kit This Tunnel-Hull is a thrill to run on the aircraft from past years, although the could no longer relate with the exotic water and a thrill to watch All wood k

The price is $19.95 at your local hobby hobby local $19.95 is your at price The the with provided are screws cap steel the As engines. their for designed reig iety rm aoe (Cali­ Tatone from when directly shipping ordering for $1.50 Add dealer. specially and polished machined is brightly which and mount aluminum fornia residents add salesadd tax). residents fornia hardened Four breeze. a is installation tensile high cast, a Tatone as available has month now this product new announcement second the in interested Tatone. mount to make life make easylife to mount modeler. the for tapped, and drilled are holes mounting not convenient, order direct from from direct order convenient, not stronger than the originals, and are are and originals, the than stronger These body shells are three times times three are shells body These Π06Ρ. 1106No.available No.clear painted and Lexan. genuine clear, crystal tough, MRC/Tamiya the for body replacement can now be sanded with speed and ac­ speedand with sanded be now can up tilts table five-inch by four Thedisc. a from that of removed plastic,and areeasily attached and capable metal, pads, wood, self- sanding abrasive quality, high adhesive utilizes It versatile. sander quality Sander. Thisprofessional la N. 18o ane N. 1108P. No. painted 1108 No. or .050 clear clear crystal from Made spolier. American the in machine racing true the to unique machine racing only the replacement Lexan new exciting three Ford XLT150 is thermo-formed in super in XLT150Ford isthermo-formed Like kit. all MRP bodies, 1/10 the offroad uay Tesne hsa /5h, 5.000 hp, has 1/15a sander The curacy. disc.sanding the to angle that table angle. hold the will tightened, prescribed is a be knob can to the When table tilted the quickly knob, a sand loosening to operator atedges any the Byand angle. joints perfect allowing 45° to aluminum solid diameter, four-inch and accurate, rugged, etal, m all is for tool useful Disc itsTilt-Table most objects, small making the probably is hc Lxn te crin s available is Scorpion the Lexan, thick Sprint Scorpion winged the comes 1107P. No. painted and scale 1107 No. clear 1/10 in in comes all It cars. fits offroad molded and is Lexan car genuine Sprint Outlaw exhaust The and box air Huge tradition. 98033. WA Kirkland. (Model MRPRacing Products), 12702-D from carsN.E. 124th R/C St., for bodies infor­ further 62708, IL for Springfield, n jra tnad hay uy 360°, duty, heavy standard, with jarmac tne equipped comes and motor, rpm aig hstuh oy etrsbt a both features body tough this racing, fast, course closed for Designed Buggy. style. body exciting this enhance pipes isa Sprinter States. Outlaw The United miter guide. miter angles compound requiring strips Long roof air foil as well as a huge rear deck rear as huge asa well foil air roof smallwork. fine for designed other tools power and sander, this on mation truck. This is a super tough, .050Lexan tough, a issuper This truck. Four-cycle, OSFour-cycle, Max 120be owners will )armac, Inc., has just introduced what what has introduced Inc., )armac, just is e aeteFr XLT150Ford have the First we pickup 2785, Box P.O. Inc., )armac, Contact Next, we have the Outlaw Sprint Car, Sprint Outlaw have the we Next, have means least,we no by Last, but Finally, from the California desert desert California the from Finally, ★ ★ ★ ★ ★ ★ ★ ★ L L ER ILD U B EL D O M INDEX TO ADVERTISERS Ace R/C Inc...... 73 Robbe Model Sport...... Cover 2 Adventure Model C raft...... 80 K&S Engineering...... 91 Satellite City ...... 3 Aeromarine Laminates. Inc...... 71 Kraft Systems...... 85 Sig Mfg. Co. Inc...... 4,5 American Junior Heritage...... 88 Laminar Research...... 95 SR Batteries...... 74 Astro Flight, Inc...... 86 Lehmberg Enterprises ...... 80 St. C roix...... 100 Beehive R/C Model Aircraft Co...... 84 Leisure Electronics...... 93 Tatone Products...... 73 Dave Brown Products...... 90 Lutmi Enterprises...... 82 Technopower II. Inc...... 77 Bud Caddell Plans...... 93 Midway Model Co...... 76 Teleflight Research...... 91 Campbell's Custom Kits...... 78 Midwest Model Supply...... 88 Top Flite...... 72 Cannon R/C Systems...... 82 Walt Mooney...... 92 Uber Skiver...... 1 Champion Model Products...... 87 Model Rectifier Corp. (MRC) .. Cover 4 VL Products...... 72 Circus Hobbies...... Cover 3 Northwest Model Exposition...... 66 Westburg Plans ...... Eric Clutton...... 70 Novak Electronics...... 87 Buzz Waltz...... 81 Jim Crocket Replicas...... 75 Octura Models ...... 75 Williams Bros...... 74 DL Products Corp...... 68 Peck Polymers...... 68 Wilshire Model Center ...... 89 Du-Bro Products...... 69 J-5 Enterprises...... 94 World Engines ...... 67 Electronic Model Systems...... 76 John Pond...... 90 NickZiroli ...... 81,89 Dick Hanson...... 92 Precision Sanding Tools ...... 86 HOUSE ADS Hobby Horn...... 70 Proctor Enterprises...... Hobbypoxy Products...... 83 Prop Shop, The...... 84 Binders ...... 94 Jomar Products ...... 78 Repla-Tech Int...... 92 Full-size Plans...... 96 K&B Manufacturing...... 79 Rick's Kits ...... 77 Limited Edition Prints...... 99

A C C I C i p n AHQ IMPORTANT INSTRUCTIONS: Noncommercial FIFTY CENTS bnngs list of new/used model I I O (personal items) rate is 25 cents per word, motors, accessories balsa kits Motor trade- with a minimum of S3.00. Commercial rate is40 cents per word, with a minimum of S5.00. No ins wanted T Crouss. 100 Smyrna. West advertising agency discounts allowed. Name and address free, phone number counts as two Springfield. MA 01089 words, abbreviations count as whole words and w ill be spelled out. All ads are payable with order, and may be for any consecutive insertion period specified. Send ad payment to: LIST YOUR RADIO EQUIPMENT for sale No M O D E L B U IL D E R . Classified Ads. P.O. Box 10335. Costa Mesa. C A 92627 0132.______fee for listing Escrow available Send SASE for details Radio Equipment Exchange Box WILL PAY AT LEAST S300 for any complete PLANS ENLARGED — Blueprints to nine leet 561. Park Forest. IL 60466 original Ell Also want other vintage ignition from your plan or book page. SASE for prices. model engines and paris Woody Bartel! Scale Plans and Photo Service. 3209 Madi­ PAW DIESELS — England's most popular 5600 Portage Road. Kalamazoo. Ml 49002 son Ave. Greensboro. NC 27403 diesels now available, 049 to 29. throttled (616) 385-3696 and standard, at low prices Throw away WANTED — OLD MODEL ignition engines those plugs and batteries. Use a self-con­ NATS WINNING Bellanca Aircruiser. Senior cars, etc Paying top dollar Bill Simpson. 7413 Indoor and Outdoor Rubber Scale Plans: tained diesel using hall the fuel of an equiva­ Via Lorado Rancho Palos Verdes. CA 90274 lent glow motor Send $1 for list. Eric Clutton. SI .50 Send SASE for list. David Aronstein. 50 (213) 377-3532 3816 De Soto Ave. Fort Meyers. FL 33905 Pasture Lane. Poughkeepsie NY 12603 SCALE DOCUMENTATION — Photo packs, RAZOR BLADES, single edge industrial first WANTED Spark ignition model airplane quality — extra sharp: 100/$4 25.200/S8.00; three-views, cutaways for 800 aircraft. Giant. motors parts, race cars. Circa 1930-1950 Precision. Fun Scale plans. Eighteen page 300/S11 75. 500/S19 25 1000/S37 50 Russell Stokes Rt 1 Box 520 Keller. TX Postpaid In U S Cobbie's Gilts, Postbox 2. 76248 catalog. $3 Scale Plans and Photo Service. Deal. NJ 07723: (201) 922-9898 3209 Madison Ave., Greensboro. NC 27403. COMPUTER CONTROL OF R/ C SERVOS - BEER CAN BOMBERS — High performance Control up to six servos with your Timex FOR SALE — Radio Control Models and hand launched gliders from lightweight TS-1000/1500 or TRS-80 Personal Com­ Electronics (British), from 1963 through 1975. aluminum beverage cans Two full-size puter Perlect for winter projects, robotics, $75. Radio Modeller (British), from 1970 patterns with illustrated labrication and Hying model actuation experiment! Software and through 1980. $50 Enrique A Blandino, 549 instructions Send $4.00 to: Beer Can Bomb­ application notes included Write for free Washington St.. La Cumbre. Rio Piedras. PR ers. Box 97 Southeastern. PA 19499 information or send S10 00 tor plans, or 00926 UNUSUAL Rubber CO2. and Peanut Scale $39 95 for complete kit Satisfaction guaran­ TOLEDO-WEST HOBBY SWAP MEET Buy/ plans: HE-219 JU-87 Farman Goliath, and teed Fratello MicroElectromcs. Department sell your engines, airplanes, kits, race cars, or 30 more Send S1 00 lor catalog lo Haught B1. P O Box 4007. Hampton, VA 23664 radios — $2 donation La Palma Recreation Graphics. 5460 Southbrook Ft Wayne. IN PLANS Mini Paagan by Denny Davis Nos­ Center. 7821 Walker St.. La Palma. California 46815 talgia Third Payload at 1983 Nats' Postpaid January 7. 1984 from 1:00 to 4:00 p.m ANTIQUE MODEL AIRPLANE KITS lor sale: $4 00 Stephen Landy. 44 Chaplin Road. Newton Centre. MA 02159 P-30 CONTEST MODEL PLANS Two-minute U/C. and solid scale Stanzel: Edco: Girard: flights possible Builds fast and easy. $3 75 Modelcralt: etc Send SASE lor list Charlie GRUMMAN F7F-3 TIGERCAT plan. 1/24- postpaid P-30 Werks. 1715 Knollwood. Apt Oehler. 13 Dogwood Dr Smithtown, NY scale tree flight rubber, or CO2 Postpaid P-4. Kalamazoo. Ml 49007. 11787 $4.50 SASE for complete list David Diels. P-51B SCALE DRAWINGS. Accuracy guar­ P O Box 101 Wood ville OH 43469 ANTIQUE IGNITION ENGINE PARTS Excel­ anteed Four sheets 24 x 36: Y< in = 1 ft. $15 00 FORSTER IGNITION ENGINES. English and lent reproductions of original timers, points, rolled, postage paid SASE for details Charles Chinese diesels, parts and supplies Visa tanks, etc Send $1 for information and price Neely 2703 E Goshen Ave., Visalia, CA Mastercard Send SASE to M&G Engines. list Micro Model Engineering. 5600 Portage 93291 P O Box 6026. Denver CO 80206 Road. Kalamazoo. Ml 49002.

These and other MRP products are found that SR’s 900 series cells are just If you’re thinking that the SR battery available from your local MRP dealer or the ticket for many installations. They packs cost more than the others, you’re directly from MRP. are, for all practical purposes, the same right . . . they do. However, I’m con­ ★ ★ ★ size as 500 mah cells (although a tad vinced that I’m getting my money’s heavier), but will damn near double worth . . . that I am getting what I've paid Tell ’em you saw it in Model Builder! · also absolutely minimize installation for. Who else carefully checks all the problems in ships like Sig’s Quarter- cells going into a pack to make sure that Scale Cubs where any amount of cock­ they’re all on a par with each other? And pit detail greatly reduces the space how about their guarantee to replace B IG Birds .... Continued from page 25 available for the radio gear. By using 900 any pack that forms a memory within mah packs you eliminate a lot of misery that first year of use. It’s nice to know your transmitter’s "on” time. They will and still provide yourself with adequate that someone really has confidence in more like they’re rated at 1800 mah), I’ve battery protection. his product and is w illing to stand FEBRUARY 1984 97 Don’t miss the greatest Radio Control Show in the East at the Westchester County Center, White Plains, N.Y. It’s our 16th annual show and it’s sure to be the biggest and best ever! This year’s WRAM Show is going STATIC COMPETITION Registration of models will start at to be the largest yet. Well over Make sure your latest creation is 8:30 a.m. each morning. 150 manufacturers and other ex­ finished up and polished so you'll S W A P S H O P hibitors have already signed up have a chance to take home one of The WRAM’s Swap Shop has be­ the dozens of trophies to be offered to bring you everything that’s in these events: come one of the major show attrac­ new in the hobby ... kits, tions with thousands of individual engines, radios, accessories and • wwi • SCALE RC BOATS. items changing hands. To help • POST WWI (Military) (Military) eliminate “registration crush," the everything in between. And, our • POST WWI • SCALE RC BOATS, Swap Shop will provide for preregis­ famous Swap Shop will be in full (Non-Mililary) (Non-Military) • PATTERN • RACING R/C BOATS tration forms. To receive these forms operation with thousands of • GIANT SCALE* • STAND-OFF SCALE send a self-addressed stamped items, including built-up planes, • OLD TIMERS • JUNIOR EVENTS envelope to: John Isbister, 4 Devon • SPORT • RC CARS up to 1/8" scale almost new radios, engines and Rd., Larchmont, N.Y. 10538. on and on and on with some­ • GLIOERS • RC CARS over 1/8" scale • HELICOPTERS • BEST-IN-SHOW* · SPECIAL NOTE thing for just about everyone. 'Em nes may be limned due to space availability "B e st in show w ill be awarded a VCR This year there will be no restrictions in the number of built-up models a ADVANCED TICKET SALES Judging takes place Sunday after­ noon. Entries accepted until 12 Noon registrant may place in the Swap Save time ... avoid long ticket Sunday. Shop. lines — contact Ed Alexis, 1587 Special admission area will be pro­ For further information, write or call: Central Park Ave., Yonkers, N.Y. vided on both days for static display Ron Faanes, Route 4, Box 204, Pound- 10710. 914-337-6632. contestants with built-up models. ridge, N.Y. 10576, 914-763-3986.

WESTCHESTER RADIO AEROMODELERS, INC.

The Westchester County Center Is centrally located in the city of White Plains. N.Y.. at the inter­ section of Rt 119, Central Park A v e , and the Bronx River Park­ way. White Plains is just 22 miles north of N.Y.C.

98 10 A.M. to 6 P.M. A CUT PrecisionABOVE cutting instrument out­ lasts the competition by ten to one.

The Uher Skiver was designed to meet ihe precision require­ ments of photofabrication, microcircuitry, graphics arts pro­ duction, etc., and as such becomes the perfect cutting tool lor the discriminating modeler.

ONE BLP^ EALUTD A y M°!tun°utSNAGGtNG_

Long Life Stainless Steel Blades Availiable in seven satin anodized handle colors: silver, blue, red, green, gold, black, and violet Rear Oraw Bar Clutch Complete set in litted hardwood case; includesUber Skiver, together with two vials containing Instrument Quality Materials fo u r No. 11, and one each o f Nos. 10. 12, 15, and 20...... $16.95 Advance Collet Design See your dealer, or order direct. Dealer inquir­ Individual handles (specify color)...... $6 95 Hex Cross-Sectuon ies invited. Orders are shipped First Class mail Vial of 6 blades (No. 10, 11, or 15)...... $3 .00 Deeply Knurled Grip in the U S .. Canada, and Mexico. Overseas A ir Blades can be resharpened mail add 25% of total order. Remit by Inter­ (No. 12 or 20)...... $4 .00 national Money Order or U.S. funds. Postage paid for A P O and FPO orders. e n VISA and MASTERCARD add 5%, and include expir­ MODEL BUILDER PRODUCTS ation date and signature. California residents add 6% sales tax. P.0. Box 10335, Costa Mesa, CA 92627, Dept. A.V. (714) 645-8830 behind it. Also, here comes that old would be too limited. How about it, Ace, (over half a pound more) engine. peace of mind thing again, I feel better L.R. Taylor, Royal, RAM, or anyone else As usual, once the problem was about committing my BIG Bird to the . .. can’t you give us what we need? identified, the solution was easy; I dis­ wild blue with something more sub­ There are one helluva lot of us now,and carded the nylon mount in favor of John stantial than an "El Cheapo Special’’ we do have buying power. Tatone’s aluminum beauty .. . and was battery pack for power. HOW I SPENT MY treated to a classic illustration of cause A self-addressed, stamped (business- SUMMER VACATION and effect. Tatone’s brightly polished, size) envelope to SR Batteries, Inc., P.O. Trying to track down some elusive cast aluminum mount (it’s drilled and Box 287, Bellport, NY 11713, will get you vibration, that’s how! tapped, also) virtually eliminated the all the details .. . and quite possibly will Even before I helped install,align,and vibration in one fell swoop ... or is it keep your bird from becoming an balance turbines and generators for one swell loop? Anyhoooo, the message obituary notice in the very near future. Pratt & Whitney, I knew it was important here is to persevere, and through the ADEQUATE CHARGERS . . . to mount engines properly. After doing process of elimination, you, too, can WHERE ARE THEY? the balancing act for P&W for seven become a great troubleshooter. All indications are that most BIG Bird years, I’ve become an absolute believer CUTE lovers have paid attention to the con­ that there shouldn’t beany compromise That was my first impression of Ikon stant preaching about using 1000 mah, when installing and balancing engines Northwest’s Porterfield Flyabout as I or bigger, airborne packs. The problem and props. And that’s why I shudder pulled into the RAM’s flying field park­ now is that few of these guys have a every time I read or hear about washers ing lot. Emil Neely was having a most charger equal to the task of charging being used for adjusting thrust angles. enjoyable time sorting out his prototype their heavy duty batteries, and many are That’s no way to treat any engine! Shim­ four-stroke design, so I stayed in the van crashing because they’re trying to bring ming with washers is the best way I know for a while and watched the grown man these packs up to snuff in 16 hours using to guarantee poor running, excessive play. their standard 50 mah chargers. It can't vibration, and distortion. That engine As Neely's competent thumbs put the be done! Your 500 mah pack would be must be solidly mounted or it, the air­ Flyabout through all the maneuvers, I fully charged, but your 1000 or 1200 mah frame, or the radio will be short lived. realized that we usually reserve "cute” pack would be doing good to have a Which leads me to the shaking prob­ for small and/or dainty things or people. third of its potential restored. lem I had with my Magnum four-stroker. But as I eyeballed this black and orange Right now, I know of nothing com­ At first I thought I’d sloughed off on my bird doin’ her thing, it was apparent that mercially available that has more than a prop balancing . .. and then I figured she was a cutie ... all 10 pounds and 80 120 mah o u tp u t. . . which means that all that either the plug or the fuel was at inches of her. This particular Porterfield the 1800 mah and 2000 mah packs out fault. From there I went directly to the design looks like it might have been a there are getting shortchanged, or that a engine, and blamed it for the shaking. model first, long before anyone even lot of you guys are having to charge for However, I finally got some smarts, and thought of scaling her up into a man­ long and impractical hours. Why haven't realized that the nylon mount (it was the carrying version. we seen variable chargers with a 200 mah only thing left to blame) was terribly The Enya .90 four-stroke Emil used for output? It certainly can’t be beyond our sympathetic to certain harmonics . .. power didn’t have to work too hard. technology ... or perhaps the people which were amplified because the Even though it was brand new, running capable of making this kind of charger longer-than-normal four-cycle mount rich on two-cycle glow fuel, and under feel that there’s no real market, and sales trying to support a heavier-than-normal propped with a 15-6, the Enya started FEBRUARY 1984 99 flight, I stopped nit-picking and enjoyed for a moment or two . . . and that's all it myself. Emil scaled down the airfoil takes. NEW R/C that’s done so well on his Monocoupe Of course, all this precaution probably 90A (this plane only has a 12-inch chord), w on’t preclude some of our BIG Bird BOOKLET and this somewhat high-entry, flat- brethren from doing the dumb deed on Answers the questions bottomed ’foil worked the same king of themselves, but BIG red letters on a most often asked by magic for the Flyabout. contrasting white or yellow background those who want to get started in R/C Ikon Northwest hopes to have the should stand out and get the message flying; PLUS, it in­ Porterfield Flyabout ready by the begin­ across. Say, this might be something that troduces you to the ning of ’84. And just lo whet your four- can be mass produced by one of you best airplane to start stroke appetite, the airplane-happy Mr. clever people out there, along with with, the GOLDEN Neely has already got an 80-inch Corben chocks, pitot covers, windshield/canopy FALCON! Super Ace framed up. It should be avail­ covers and . . . if you make me an offer I To receive your copy able not too long after the Porterfield can’t refuse, I may give the okay to also SEND S2.00 TO hits the market. market Schnuerle Ported Windsocks. ST. CROIX OF PARK FALLS, LTD. WHY DIDN’T I THINK OF THAT? First come, first served! Back in the November “ BIG Birds.” I TIP OF THE MONTH P.0. Box 279P - Park Falls, Wl 54552 pointed out a very real hazard connected "W hen locating the crash site, re­ with P.K.'s new Super Starter .. . that member that a dog is just a dog, except easily and ran well (in spite of all that even though the engine might be abso­ when he’s facing you . . . and then he’s excess oil . . . yuk). Because of the rush lutely dead, anyone turning the prop Mr. D og." to get in some test flights before the clockwise was gonna wind up that spring Al Alman, 605 168th Street, East, Box rains came, we didn't have time to try and get one helluva boo-boo. There 95, Spanaway, WA 98387. Keep those other props, but I’m quite sure that a 16- doesn’t seem to be any way to disable cards, letters, and pix coming, guys. 6 or a 17-6 would have been a better the SS when the engine is dormant, but We’re all involved, and that’s good. match. Jim Webb, San Antonio, Texas, came up FHappy New Year! Mr. Neely knew I wanted desperately with a great idea for warning folks about FLYING SAFETY IS NO ACCIDENT!!· to try out his new birdie, but chose to the hazard. "You mentioned about the inherent ignore my plight... till I started to drool Workbench. ... Continued from page 6 all over his Mode II elbows. Realizing danger of the spring starter in your there was no escape (I drool good, and, November column, and I started doing a flight to determine what should be done for a 250 pounder, I’m quick and nimble little brainstorming. As a result, my next to improve performance. As is when I have to be), he passed the trans­ better half will shortly be sewing to­ proper, one adjustment/one flight, was mitter to me in self-defense .. . and be­ gether a pair of prop blade covers, much the basic procedure . . . a little more came an observer for the next 15 min­ like what you'd see on real props at the rudder, a little less clay on the nose, a utes. local airfield. M y covers will have at least longer motor (braided to take up slack), No wonder he’d been smiling from Ί/2-inch thick foam sandwiched be­ moving off the runway to launch from ear to ear; the plane was a delight to fly. tween the covering material. . . and in the grass. .. "The air’s too stable over Ground handling was good, and after BIC red letters will read NO on one the b la ckto p ,” says Jack, "la u n c h it thumbing in a tad of downthrust (I like blade, and FLIP on the other blade. If over the grass where it's starting to lift.’’ to fly with just a hint of backpressure), some dummy of reading age regards this The three of us got so absorbed in this she felt like an old friend. Some aileron as enticement, well. . . what can you do? project that Jack and I missed the R/C differential would have helped the rolls If some dear little rascal below reading part of the contest completely, our a bit, but as this was only her second age grabs the prop, the blow should be biggest kick being the flight that broke cushioned enough not to be so dam­ one minute. Bill only placed about fifth aging. What do you think?’’ or sixth in the event, but in terms of fun, MOVING? Well, Jim, I think it’s a step in the right we, the committee, came way out on Change of address notices must be received direction, but we still can’t shirk the one month before date of issue that new TOP. You can imagine the total cost of address takes effect. For prompt service, responsibility that goes with having the this model, and how long it took Bill to old label must be included. Post office will SS installed. Either isolate your planes, or put it together. not forward copies unless you pay extra tie the kids up . . . or have an alert safety postage. D uplicate issues can not be sent. Where am I going with this bit? Well, MODEL BUILDER, P.O. Box 10335,Costa man there at all times . . . or (E) all of the it’s easy to sit here and make suggestions, Mesa, C A 92627. above, because no matter how careful as long as you don’t have to be concerned parents are, some tyke is gonna get away with trying to carry them out. But I’ve seen cycles occur before, and I just wonder if it isn’t about time for some lTOLEDO/84 existing ... or maybe new kit manufac­ THIRTIETH ANNUAL R/C EXPOSITION turers to pick up the marketing tech­ TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO, OHIO niques used by outfits such as Comet Reserve April 6, 7 and 8. 1984 Bring your latest completely and Megow back in the thirties, and to attend the world's greatest finished models to display and scatter stick-n-tissue model kits into all radio control model show. See enter the competition for ex­ sorts of outlets; department stores, the latest and greatest in radio citing awards. Competition control equipment as presented models will be accept during hardware stores, drug stores, toy stores, by leading manufacturers. Talk show hours till 10 am Sunday even gas stations (a lot of them are now to notable r/c personalities and morning. There is no entry fee. selling snack foods), and for that matter have your questions answered. Complete radio control systems . . . just think if every 7-11 had a bunch of We are featuring one of the will be awarded to first, second kits on one shelf . . . have you ever world's largest Swap Shops (no and third place winners, a dealers), complete refreshment brand new Microwave Oven noticed how many kids stop by the local centers, the Saturday Night will be presented to the lucky 7-11 on their bicycles to pick up some auction, raffles of complete r/c winner of the Best of Show. miscellaneous stuff? The proprietor systems and accessories, and Come, Join us and enjoy your- ^ P β I I hangs up the best model built from the acres of free parking. selves at unquestionably, the world's greatest radio control FRIDAY 9am I available kits each week, the builder model show. Open lo the public SATURDAY 9 am t winning a gift certificate for buying 7-11 all three great days. SUNDAY 9 amt merchandise.. . Get your feet off the barrel, Henry, the Weak Signals R/C Club P.O. Box 5772 Toledo, Ohio 43613 lady wants a pound of them coffee beans! · 100 MODEL BUILDER ew High Performance Guidance System pace age technology in the palm of your CENTURY VII HELICOPTER CENTURY VII PATTERN and-you’ve got it when you fly with Cen­ Seven channel system, dust proof open Seven channel system, dust proof open try V II from Circus Hobbies, the newest gimbals with adjustable stick lengths, gimbals with adjustable Mick length, tem berof the JR equipment team. ratcheted electrical double trims, plug-in ratcheted electrical double trims, plug-in R E module and plug-in crystal mini re­ Whether you are a weekend llyer or serious R.F. module and plug-in cry stal mini re- K ompetitor — pattern ships, helicopters or ceiver. D.S.C. direct servo controller, ser­ ceiver. D S C' direct se n o controller. ser« j vo reversing switches, dual rate rudder, ailplanes— the Century VII is packed vo reversing switches lull channelsi. servo' aileron and elevator, inverted flight switch, end point adjustments on: retractable land-· /ith all the sophisticated circuitry you will pitch curve adjustments, tail rotor compen­ ver need. State o f the art electronics, rag­ ing gear, rudder, elevator and aileron, cle- j sation. Hi-idle, throttle hold, hovering ed. lightweight, and incredibly fast, that vator/flup mixer. V-'Tail mixer, rudder throttle adjustment, tail rotor end point ad­ rovides unmatched programability. reli- aileron mixer, dual rate and or exponential ■ ■' justment. trainer system, full swiveling re­ bility, accuracy and that subtle feel of user selectable on: rudder, aileron and ele« movable and stow able antenna, dual pur­ valor, a trainer system that can also be used!’ . uality you expect from Circus Hobbies, pose meter which serves as both power and with all existing Unlimited V III transmit- “· i’s no wonder that 8 out of 10 modelers in ters. full sw iveling removable and me recent 1983 Master’s Hew JR equip­ volt meter, fuse protected charge circuit, carrying handle, all housed in a beautiful stowable antenna, dual purpose meter ment. Experts that demand the heavy duty extruded aluminum case. Avail­ ame high performance that you ", * which serves as both power and o. W hen you’re ready for an Γ able in 53 and 72 MHz. EM frequencies. I volt meter, fuse protected charge With 501 servos. Also available in AM . xtraordinary system, call us at circuit, carrying handle which also' ’ircus Hobbies, we’re dedicated serves as a back rest, all this EQUIPMENT housed in a beautiful heavy duty : o providing High Performance Century V II Pattern and Helicopter sys­ extruded aluminum case. Available j without the high price. tems come supplied with 4 servos, in 53 and 72 MHz EM frequencies Lj] rechargeable battery pack, receiver. JR C )rders Only — Toll Free Also available in AM. 221 charger, servo trays. D.S.C. cord, and (800) 782-0022 Customer Service all servo mounting hardware. Circus Hobbies Inc. 1 3132 S. Highland DtÆ And Information Las Vegas, NV 89109 (702) 732-0022 Century VII helicopter $254.95 Å Pattern $234.95

CElMfYijfl r - All Pnces Subi ct I SOMETHING VERY BIG HAS JUST HAPPENED TO READYTO-FIY Introducing MRC’s Cessna Skyhawk. The first large scale RTF: • 6 Foot Wingspan · 49 Inch Long Fuselage · Rugged Construction

IT LOOKS AND FLIES LIKE A SUPERB HANDLING FOR buy MRC’s Skyhawk and be REAL PLANE NOVICE AND ADVANCED ready-to-fly in little more than There are lots of large scale It’s attracting beginners and 90 minutes. R/C planes you can buy, but pros who are hooked on its The Enya .35TV engine is none are “ready-to-fly’’ like our ready-to-go status, and superb already installed as are most Vs scale foam Cessna Skyhawk. handling. Trim the control sur­ of the other time consuming And none offer the realism or faces for minimum movement assembly operations, including rugged durability. and handling is soft and gentle control rods, hinges and horns, INCREDIBLE STRENGTH enough for a beginner... fuel tank, motor mount, and To prove its unique, rugged Set it up for added deflection ailerons. Of course, decals, construction would stand up to and it responds with a maneu­ prop, plug, muffler and muffler incredible pressure, we removed verability that experienced fliers extension, wheels, and most the landing gear and had a 170 lb. can sink their controls into. Re­ every other component is flier straddle the 6 foot wing. He sponsiveness is complete with included. Fuel battery and radio barely left a mark on the foam. four channel control of steerable are not included. What supported the weight? A nosegear, aileron, elevator, See the biggest thing in RTF combination of carefully de­ rudder and throttle. at your hobby dealer, MRC’s signed features like wooden BUY AND FLY Cessna Skyhawk...it's a new spars...and coupling high den­ And instead of spending dimension in flying. sity foam with full 1 inch thick hours building a big, beautiful, sidewalls. stand-off scale craft, you can MRC® Model Rectifier Corporation 2500 Woodbridge Avenue, Edison, New Jersey