M A Y 1974

MODEL # volume 4, number 30 BUILDER ONE D O LLA R DUMAS HYDROS LEAD THE PACK!

Atlas Van Lines — 40 — A real 1/10' 1" scale model Drag’n Fly — 40 — The latest in our meet-winning of the winningest unlimited hydro in the Gold Cup cir­ series of Drag n Fly hydros. The Mark II starts with the cuit. She incorporates many of the newest design fea­ basic Drag'n Fly hull and incorporates the latest inno­ tures such as pickle-forked bow to eliminate excessive vations in bottom design for even greater speed and lift Here's a model that's been burning up the course in maneuverability Includes plans (only) for realistic new RC hydro boat competition. 36" long, rugged birch and topside hatch to help keep your engine running as she mahogany plywood construction for 40 engine powers past the roostertail of the competition. 36" for Kit AVL-40 40 engine All pre-cut birch plywood construction Kit HY-2A. Kit HY-3 28” Drag n Fly -20 for 29 engine Kit HY-1 44” Drag n Fly -60 for 60 engine

OR JUST PLAIN FUN TO BUILD AND RUN...

Whether you're just starting out in this exciting hobby or have become a competitive RC buff, your first kit will convince you why experienced modelers say, Dumas Kits are for show and go Rugged construction, top quality materials and easy-to-follow plans all add up to eye-catching beauty and trophy-winning performance. Many models can be purchased complete with engine and running gear and precision running hard­ ware is available for all. See your hobby dealer or send 50Φ for our new catalog illustrating the complete Dumas line of boats and dum as planes

Dumas Products, Inc. 790 South Park Avenue,Tucson, Arizona 85719 TIME

WRITE FOR FREE CATALOG

Worlds Largest Manufacturer of Proportional R/C Equipment K? SYSTEMS. INC. 450 WEST CALIFORNIA AVENUE, VISTA, CALIFORNIA 92083 1st Class!

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Service and spare parts available thru-out U.S.A.

PLEASE CONTACT ÝOUR DEALER! . DEALER,-PLEASE CONTACT YOUR DISTRIBUTOR DISTRIBUTOR INQUIRIES INVITED!

' ^ y f c t :

MODEL AIRCRAFT INC., 1424 E. Borchard Ave., Santa Ana, California 92705 (714) 835 7788

' S * T ÍÍ 903 Church Street. Nashville. Tennessee 37203 BBY CMFIT91.ffl Hrt JJHΙΙ.¥»·Λ· PFJ JXfi luC Phone (615) 259-4612 (Est. 1951) Home (615) 352-4380 World's Largest Supplier of Deluxe Est. 1951 Est. 1951 Built-Up RC Aircraft For fast delivery, call us with those C.O.D. orders. We stock all major brands. No order too small or too large.

Carl Miller, longtime modeler and manager of Send 50C PT-17-C BIPE. Pictured above is one of the finest scale airplanes Hobby Capitol, U.S.A.. displays his three cus­ we have ever offered for sale. It is a 70-inch span, perfect scale tom built Spinx Akromaster planes. aircraft with superb detail, including bucket seat, pedals, exact fo r Big tubular structural construction in cockpit. The plane has an im­ If you're looking lor a particular type ot air­ maculate finish with rivets, etc. A painstakingly constructed plane ready to fly, contact Carl. He's got what radial engine is nestled inside that beautiful cowl for static juding you need. Average 100 in stock always. B ro chu re points. Truly a labor of love, this outstanding miniature aircraft has over 500 hours of professional work in it. The price is S800.00. Save With a Used Radio We receive many of our used radio sets from hobby­ ists who simply want to trade for a newer model, a different stick or servo configuration, or, like many people who buy a new car every year, just want something different. Often you will find that by choosing a good used radio from us, you can out­ fit yourself completely with radio, plane, motor, etc., for less than the cost of a new radio by itself.

USED PROPORTIONAL SETS 3. Min-X Pulsemite 800 Tx 1. Digital USA 4-ch on 72. only. $20 with 3 servos. S135. 4. Single channel servos. $5. 2. Min-X 6-ch, 2-stk, on 5 .0.S. SS-2 escapement. 72.160. S125. New $4. Part of Our Used Gear 3. C-aire 4-ch, 2-stk. dual 6. Caire GG set. Complete. ext. chgr 3 servos. $130. Tx, Rec and actuator. $40. 4. Servos for Bonner 4-RS MULTI-CHANNEL REED SETS OLD IGNITION TRADE-IN system. Each $15. 1. Kraft Custom 10-ch Tx & 5. Receiver only tor Orbit Rec. New. $70. We buy and sell old time ignition engines. Box up 6-ch. with plugs. $25. 2. C’ship 10-ch Tx & 2 Rec. what you have and send to us for an honest ap­ SINGLE CHANNEL-USED Relayless. On 27.145. $30. praisal. It could be worth a new proportional set 1. TestorsSimpulsecomplete 3. C'ship 10-ch TMS Tx. Rec to you. We have many engines with which you can $30 RL. 3 servos. also start a collection. 2. Airtrol GL-100. Tx. Rec & 4. C'aire 10-ch 27.195. Tx, We welcome your built-up airplanes, used pro­ 3 servos. $45. Rec. 5 servos, Pak. $75. portionals and old time ignition engines. Come We carry all kits, motors, R/C units & ac­ trade with us. Top dollar paid. cessories, the same name brand mdse, any distributor may have. Order from any catalog or magazine for our very fast ser­ vice. C.O.D. is the way to go. Send in your old ignition motors and used proportional sets for top dollar appraisal.

Authorized distributor for Futaba proportional equipment, the best radio on the market for per­ formance and price. Dealer inquiries invited.

MAY 1974 1 M S η MODEL AND CRAFT SHOW TWO BIG “ / t c t Ó M . ” DAYS MAY 11th & 12th OVER 200 EXHIBITORS Indoor and Outdoor Demonstrations Radio Controlled Planes, Cars, Boats, Helicopters Gliders, Rockets and Plastics CONTEST OPEN TO THE PUBLIC' Over 57 Categories with trophies, Γ awards and prizes in each. NO FEE. Check local dealer for details.

HOURS: SAT 10 AM-8 PM SUN 11 AM - 6 PM Admission: 2.50 Adults 1.50 Jr. (under 18) Under 6 Free SAVE 50 WITH FREE DISCOUNT TICKETS AVAILABLE AT ANY LOCAL HOBBY SHOP

CONVENTION CENTER 800 West Kotello Ay·., Anaheim, Californio NEXT TO DISNEYLAND

7h& U&i&a&Ce- SIG DOUBLER RC-14 SIMPLE CONSTRUCTION FAST BUILDING EASY TO CONTROL!

For 3 or 4 Channel Equipment Designed by BRAD SHEPHERD

SPORT, AEROBATIC AND RACING MODEL 3 TIMES 1/4 MIDGET RACING WORLD CHAMPION In 1969,1970,1973 - Plus Many Other Racing Victories!

Austin has this to say about his converted Doubler "Little Gem": "Because of my successes with the design, and also because it is so easy to build (and fly), there are eight other active competitors here SIG in Atlanta who compete with them. Five of them are novices who wanted very much to compete in the event, but were unsuccessful Value Packed in trying to master the race course with some of the strictly Quarter Bargain At Midget design kits on the market. Every one of them has managed to compete successfully with his version of the "Little Gem". Feat­ $1495 ured in the March, 1974, issue of MODEL BUILDER, a full-size plan of Leftwich's Doubler/Little Gem conversion is available from the Flown by Austin Leftwich magazine for $2.50. See their plan listing in this issue. Sig Manufacturing CoInc. . . Montezuma, Iowa 50171

2 MODEL BUILDER MAY

1974

volume 4, number 30

STAFF CONTENTS

EDITOR FEATURES Wm. C. Northrop, )r. WORKBENCH, Bill N o r th r o p ...... 4 GENERAL MANAGER OVER THE COUNTER, Bill N o r th r o p ...... 5 Anita Northrop EDITORIAL ASSISTANT RADIO CONTROL REPORT, Frank Schwartz ...... I4 Le Gray R/C PYLON, Jerry S ilv e rm a n ...... 16 ASST. GEN. MANAGER Dawn Garrott CHOPPER CHATTER, John Tucker ...... I8

ART DIRECTOR PRODUCTS IN U$E, Bob U p to n ...... 22 Paul Plecan R/C SOARING, Le G r a y ...... 24 SECRETARY PRODUCTS IN USE, Fernando R a m o s ...... 26 A. Blackburn

SUBSCRIPTION MANAGER CONTROL LINE, Jed K u s ik ...... 27 A. Valcarsel F/F SCALE, Fernando R a m o s ...... 30

CONTRIBUTORS H A N N A N ’S HANGAR, Bill Hannan ...... 34

Chuck Hallum FREE FLIGHT, Bob S ta lic k ...... 38 Bill Hannan NFFS NEW S...... 41 )ed Kusik PLUG SPARKS, John P o n d ...... 44 Walt Mooney John Pond TETHERED CARS, Ted M a c ia g ...... 48 Fernando Ramos Frank Schwartz SCALE VIEWS jerry Silverman DOUGLAS 043A, Peter Westburg ...... 21 Bob Stalick John Tucker CONSTRUCTION

ADVERTISING REPRESENTATIVES CURTISS-WRIGHT JUNIOR, Ralph Fidance 8 WEST: Bob Upton, 20626 Clarendon Ave. Woodland Hills, California 91364 LINCOLN BEACHEY MONOPLANE, A rt R e in e rs ...... 33 (213) 883-7681 PEANUT MlLESSPARROWHAWK, Walt Mooney ...... 3 5 EAST: Walt Moucha, 605 3rd Ave., E. Northport, New York 11731 (516) 266-3596 PEANUT 1920’s POWERED GLIDER, Bill W arner...... 43

T-D COUPE, OLD TIMER, Phil Bernhardt 47 Subscriptions $10.00 per year, $17.00 for two years. Single copies $1.00. Add $2.00 for postage per year outside of U.S. (Except APO). Add 75 cents for Canada and Mexico.

Copyright 1974 The MODEL BUILDER. Cover: We must apologize for appearing to make the magazine look like a family photo All rights reserved. Reproduction without album, but the best laid plans of modelers and men don't always work out. So. permission prohibited. in lieu of several cover projects that didn't quite make it, we offer you the mod­ Published monthly by MODEL BUILDER eler's ideal domestic scene, recorded for history by the camera of Tom Mahon at magazine, 1105 Spurgeon St., Santa Ana, Taft, California, just after the third ever flight of the Powerhouse netted 54 min­ California 92701. Phone (714) 547-3963 utes, 22 seconds, and a nice 1st place trophy. Details in March and April issues. Second Class postage paid at Santa Ana, Ca.

MAY 1974 3 f r o m B i / / w o r k b e n c h ···

ARCHA-HAC! • If you just said ‘‘God bless you,” thanks just the same, but that wasn't a sneeze. ARCHA stands for American Radio Control Helicopter Association, and HAC stands for Helicopter Advisory Committee. ARCH, as it is more commonly known, is the national organization of R/C helicopter enthusiasts which is be­ ing put together under the primary efforts of Dario Brisighella (Say “ Brizz- ih-gella), 1032 E. Manitowoc Ave., Oak Creek, Wisconsin 53154. This associa­ tion is in no way sponsored by any part of the model industry. Noting the rapid growth in popular­ Fred Standa, of the Model Mariners, San Lorenzo, California, won the "B " Mono Champs for ity of this phase of the R/C hobby both 1973 in NAMB District 9 with his Dumas SK Daddle 40 ski boat. Modified ST 40 ABC. in the United States and in other active modeling countries around the world, the list will be printed in AMA publi­ the Academy of Model Aeronautics has cations so that interested members will taken the first step in establishing na­ know who they are. . . and vice versa. tional competition rules and safety regu­ The West Jersey Radio Flyers are lations for helicopters. At this time, sponsoring their Third Annual WW II letters have been sent to certain mem­ Scramble. This big contest for WW II bers of ARCH . . . those who are already scale models, will take place at Lake- the ‘‘who’s who” in R/C helicopters, hurst Naval Air Station on August 17 and as such, are directors of the organi­ and 18, 1974. Events include AMA zation. These members have been asked Scale (Fussy), Sport Scale (Fuzzy), Man­ to become the AMA Helicopter Ad­ euvers, Mission, and Combat. Also, there visory Committee, and their primary will be prizes for the most unusual or task is to assist the Contest Board in different subject and the most realistic establishing satisfactory regulations that “Kamikaze” (Dear me!). will put R/C helicopter competition For further info,contact Lee Jezorek, and safety on a nationally recognized C.D., 1701 Oakwood Terrace, Scotch basis. Plains, N.J., or Dave Meier, Asst. C.D., In as much as the H.A.C. is to be 61A North PL, Flemington, N.J. made up primarily o f A.R.C.H. mem­ * * * bers, this Association will become the Oh yes, don’t forget the Nats. This R/C helicopter’s representative to AMA has got to be the biggest 3-ring circus of in the same fashion that NMPRA repre­ modeling that AMA has ever put on. sents R/C Pylon racing and the NFFS WELCOME ABOARD Sandy Cramer (Miss Nebraska, 1973) will be represents competition free flight. As Walt Moucha (Say “ Moka”) is a well Queen of the 1974 National Multiwing R/C soon as the H.A.C. appointments are known name, face, and body in R/C Championships. See last issue for details. confirmed, and a chairman is established, Continued on page 71

4 MODEL BUILDER OVER THE COUNTER

7 ' / V i / - A 7 r 1 ' ' / i '/ ' i ' / J T 1 / ·---//; / { - - - / j _ J . T/ 1/ □ I J1 Ϊ, ' i / 1 i / ί /|/ i i . i 1 1 1 1 ■>.

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• A newsletter from Kraft Systems brings us up to date on various items being produced. The primary product, of course, is radios, and delivery on the majority of the line involves no more than a 3 to 4 week back order. The Kraft engine situation is in sus­ pended animation at this time. Original plan was to produce R/C engines, first .61’s, then ,40’s, then .15’s, all designed and developed by Roger Theobald, who should need no introduction to those who dig performance engines. The first .61 was shown at Toledo, and though it really had it as far as idle and smooth­ ness characteristics, the top end didn't meet the standards that could be ex­ pected. And so, the temporary suspen­ sion, though a new Schneurle ported engine is already on the test bed and shows unsurpassed performance specs. Target production is now late, late fall . . . Meanwhile, forget any rumors about Dieter Schluter (left) and Irwin Polk with Dieter's new "Gazelle" helicopter at the Toledo show. an ignition engine. True, it was under Deliveries from Aristo-Craft will start sometime in May. serious investigation, but like Duke Fox and his ignition Eagle .60 seen at Toledo interest. Called the Glow Plug Analy­ The unit, which slips on the top of your . . . it was a flight of fancy that didn’t zer, this gadget, made to fit either 1-1/2 volt dry cell, contains an on-off materialize. The old time Browns, Cy­ round or square 1-1/2 volt dry starter switch and a rugged meter, which mea­ clones, Dennymites, et al, still rule su­ batteries, provides instant information sures current flow through the glow plug preme . . . in their circle of activity. on the condition o f the glow plug and/or and will determine an open or shorted Meanwhile . . . Kraft did show an the battery, both of which are involved glow plug, battery condition, or engine item at Toledo that aroused a lot of in the successful starting of your engine. flooding (if everything checks out, what

ΑΤλΧ MODEL COMPANY

Tan Feb March April May J u n e

~764**A*/h*---- Kraft Systems’ new battery and glo-plug test­ 'Harrison, the question is not, 'Does it fly?' The question is, 'Does it sell?' er slips on top of dry cell.

MAY 1974 5 else?). Price o f the unit is $7.98. * * * Rosie’s R/C, Carb-Adapter Dept., P.O. Box 10306, Lubbock, Texas 79408, is offering a bolt-on adapter which allows you to put your favorite carbur­ etor on a Fox Eagle 60, 70, or 78. In case your "favorite carburetor" happens to be a Perry, you can get the whole ball-o-wax from the same source. Adapt­ er alone is $5.95; with Perry carb, it’s $17.95. Duke Fox should call for ex­ The Pup, sport .020 free flight by Peterson Products. clusive discounts! * * * J.P. Models, which specializes in R/C transportation. Both the wings and the take our word for it and order one for a glider kits featuring rolled 1/32 plywood all-flying stab are removable and can be buck ($1.00). If it seems late to be fuselages, has added a relatively small stored and transported in the kit karton getting a 1974 edition, keep in mind (98 inch span) glider kit to its line. The . . . carton. If nothing else, the easy that as a 1974 purchaser, you’re en­ Javelin, like the Dart I and Dart II, also transportability should eliminate “han­ titled to a ‘75 edition for 50 cents. employs the rolled plywood construc­ gar lash.” The ship operates well under The little 56 page book contains just tion, along with a molded fiberglass wing loadings from 7-1/2 oz/sq. ft. about any handy reference a modeler nose, all of which is assembled at the (without added ballast) up to 10 oz/ could want. Since bringing one home factory and finished with a gleaming sq. ft. Price of the kit is $49.50. from Toledo, we’ve used it to answer white epoxy paint finish. The Javelin * * * at least a dozen calls from modelers fuselage weighs 6.5 ounces. In most "The Modeler’s Companion” is the wanting to know anything from the cases, no dead weight ballast is needed name of a small booklet put out by The name of our district contest coordina­ to acquire the proper C.G. Modeler’s Press, P.O. Box 170, Ken­ tor to the address of MECA, the Model The Javelin is designed for compact sington, Maryland 20795. Frankly, just Engine Collectors Assoc. . . . it’s all in

Carb-Adapter by Rosie's R/C Products, fits Peterson Products' Lincoln Beachey will be available in two size kits; one for .020, and Perry carb to Fox Eagle engines. one for .049. Prototype .020 is a construction feature in this issue.

6 MODEL BUILDER there . . . plus AMA District map, area codes, time zones, AMA Directory of Officers, decimal and metric equivalents, shop facts (screw sizes, tap drill sizes, grit sizes) standard wood sizes, conver­ sion factors, frequency colors, wing loading chart, metric and cubic inch engine displacement chart, 12 month appointment calendar, 1974 and 1975 year calendars, visibility table, prop size chart, and more. Git one! * * * Two new books on R/C have been published. One goes by the lengthy title of “ Everything You Should Know A- bout Radio Control Flying, or How To Get 1000 Flights Out of Your RC Air­ plane,” and is published by JR Sales Company, Drawer 552, Rt. 4, Bowie, Texas 76230. It contains over 100 pages of easy-to-understand must knowledge, according to information sent by the publisher. Price is $4.95. We have also received a sample copy of a book entitled, "RADIO CONTROL J P Models Javelin, with 98 inch span, features the same rolled plywood tube type fuselage con­ M IN IA TU R E A IR C R A FT,” published struction as used in the larger Dart and Dart II. by MacMillan Publishing Co., Inc., 866 Third Ave., New York, N.Y. 10022, and released as of April 4, 1974. This book, cloth bound for $8.95 or paper bound for $4.95, has been compiled by Bob Lopshire, long time modeler, and cur­ rently A M A ’s Public Relations coordin­ ator. The book, which contains 180 pages, with 135 illustrations, is the most thorough single source of information on radio control that we have yet seen. Perhaps the best way to describe it is to list the contents by chapters: The Beginning of a Great Hobby, Some Points of Interest, Getting Started, Choosing a Powerplant, Setting Up Shop, Adhesives, Solvents and Cleaners, Kits, Construction, Covering, Color Trim, Installation o f Equipment, En­ gine Maintenance, Preflight Check-Out, Building a Field Box, Going Flying, Len Sabato's latest design helicopter features easy, built up fuselage and bolt-together mechan­ Radio Care, Some Common Sense, Glos­ ics. Will sell for less than $300. sary, Appendix, Closing Note, and In­ flight model builder type,you have been ed by William Morrow and Company, dex. told that a John Kaufmann, who has has now written a hard cover, 96 page We’d call this book the bible o f R/C, written books entitled “ Birds In Flight," book called "Flying Hand-Launched and highly recommend it. “Chimney Swift,” "Fish Hawk,” "In­ Gliders.” If your reaction is anything ♦ * * sect Travelers,” “Winds and Weather,” but amazed enthusiasm, you’re on the Just imagine that as a genuine free and “Wings, Sun, and Stars," all publish­ Continued on page 68

Some of the great new winding hooks for rubber models by Jim More noise anti-pollutants! L. M. Cox now has mufflers for all of Crocket Replicas. its engines except the .010. Mosquitoes are louder than that!

MAY 1974 7 Bob Karlsson's CW Junior putts by for the camera. Ship is a slow, realistic flier. Landings, surprisingly, are best made with a little power on. CURTISS’WRIGHT JUNIOR, CW-1 By RALPH FIDANCE . . . Originally published in the December 1971 issue of MODEL BUILDER, when our circulation was only 2,500, we felt this very popular scale model deserved more exposure. Coincidentally, it also becomes one of the first to be available with our new "Stick 'em Patterns."

Close up shot reveals a extra strut added on by Ralph to beef up the landing gear for rough field operation. Ain't she a cute little cupcake?

8 MODEL BUILDER ί

■ -Λ M .W V, f r ? " . ' S,

OK, who sneezed? With or without the help of a sneeze, the CW dismantles nicely for transporting to and from the field

• The Curtiss-Wright Junior is one of those “cute” airplanes that looks as though the designer had modelers in mind when creating it. With a 7-1/2 to 1 aspect ratio wing spanning 39 feet, and a 3 cylinder, 40 H.P. Le Blond or 45 H.P. Szekley engine, the CW-1 falls (or floats) into the powered glider category, along with the early Aeronca C-3 and Long- ster. The “ rocking horse" fuselage has a turned-up nose that gives the pilot a front porch view. This made the Junior a popular plane for aerial photography and hunting. During the years 1930 and 1931,270 CW-1 “ Juniors” were built, and the selling price was only $1500. They cruised at 70 mph, maxed at 80, and landed at 32 mph. The gas consumption at cruising speed was 2-3/4 gallons per hour, or about 25 miles to the gallon. As a modeling project, the Junior is out-of-the-rut in construction, appear­ ance, and performance. The high thrust line pusher engine and parasol wing com­ bination calls for some fancy wire bend­ ing and the use of functional struts. Its appearance at the flying field should be a welcome change from the usual run of nameless toads. As for flight character­ istics, there should be no doubt about its ability to putt around realistically. Just one thing to watch. It can use a little power on landings. If you come in Ralph Fidance, Graham Lomax, and U.S. Scale team member Bob Karlsson have all built and flown CW’s from Ralph’s plans. This is Ralph with the original model.

MAY 1974 9 FULL SIZE PLANS AND STICK 'EM PATTERNS AVAILABLE-SEE PAGE 72

10 MODEL BUILDER Tail surface control linkages from Nyrod tubes are conventional. The Micro-Avionics servos in the cockpit. Outboard servos operate cables curved outlines are easily formed by laminating strips of balsa. leading to throttle and aileron controls in engine nacelle.

View of underside of centersection, with wing panels ready for hook­ Right wing is shown attached, and aileron clevis is hooked to crank. up. Note left-hand prop which was hand carved. Not realty difficult. Wing is held on by rubber bands to cup hooks. Power is an Enya 35. deadstick, keep up flying speed with a the fin, rudder, stab, and elevator. This glue, curve them to the outline and pin steep approach until you’re ready for sort of eases you into the project, as in place. Allow these to dry and take a the touch-down flare. material and tool requirements are rath­ set before trimming o ff the excess and CONSTRUCTION er uncomplicated, the structure usually completing the framework. Everyone has their favorite method doesn’t take too long to get together, Fuselage construction is of the tra­ of building a model. Some start with and when you finish them, you sort of ditional framework type, with 1/4 inch the fuselage, which is usually considered have the feeling that you’re well along square longerons trussed with 1/4 square the most difficult, and then keep build­ with the project. Nowadays they call and 3/16 square verticals, diagonals, and ing and adding parts until the plane is this psyching yourself for the job. cross pieces. Note that all of the 3/16 complete. Others prefer to get the ted­ The tail surfaces o f the C.W. junior inch square truss members aft of the ious part out o f the way first; the wings, are basically a 1/4 inch thick framework. side stringers are installed flush to the then the fuselage, and finally, the tail The curved portions of the surface out­ inside of the longerons. This provides (which seems logical since it usually lines are made up by laminating four a raised frame, which will ensure a comes last). 1/16 X 1/4 inch strips. After making smooth, bump-free covering job. Our own preference is to start with the four-layer sandwiches o f balsa and Forward of station E, the framework

MAY 1974 11 FULL SIZE PLANS AND STICK 'EM PATTERNS AVAILABLE-SEE PAGE 72

12 MODEL BUILDER Functional wing stmts are hooked on using Rand keepers. "Z " bend Here's a good view of left-hand prop. You can get left-hand cranks in 1/16 wire provides adjustments for length. Note receiver antenna. for some engines, but carving a prop isn't bad, and it'll last forever. curves inward rather severely and may require some special treatment. We would suggest a series of vertical saw cuts part way through all members, on the inside, about a half inch apart, start­ ing at E and working forward to station A. Just before pulling the sides together with crosspieces inserted, forceTitebond or epoxy glue into all of the saw cuts to recover the strength. The tail surfaces are mounted on a carved fairing block. Best bet is to band or jig-saw the block to the profile, draw a centerline along the top, hold the fin in place and trace around it. Now glue the block in place and start carving. For final shaping, the fairing should be convexed somewhat, as shown on the drawing. The center section and cabane struts are sort o f the keystone to the whole airplane, and though they look compli­ Shot of wing strut linkage. Spade bolts bedded in ply mounts. Conventional aileron hook-up. cated, they can be assembled without too much trouble. We won’t go into the whole science o f accurate wire bending, start by making the two bends that will grooves in 3/16 inch ply, build up the but since the wire cabane struts deter­ give you the two main legs and the part strut supports from 1/16 and 1/8 ply, mine the final alignment of surfaces, across the top. Now measure 8-1/4 using epoxy for the assembly. some suggestions will be made. inches down each leg, make the right- The center section/engine nacelle is First of all, and let’s take strut No. 3 angle bends and cut o ff the excess. At made up of plywood and balsa. The for an example, don’t start at one end this point, and no sooner, you can cut bottom, under the 3/32 inch ply floor, and work your way around. Rather, out the plywood strut supports, altering is open. This area houses the aileron determine the total length of wire re­ the slot positions in accordance with bellcrank which links the individual quired for the strut, divide the figure in how your bends came out. wing-mounted pushrods to the nylon half, add an inch for good measure Incidentally, if you don’t have the tube and cable pushrod from the fuse- (looks like about 11-1/2 inches), and use of a table saw for routing the Continued on page 64

MAY 1974 13 One of many beautiful scale models an display at the Toledo R/C Conference was this DHC-6 Twin Otter, by Dave Allen, Sarnia, Ontario, Canada. Dave took home an "Honerable Mention" in standoff scale for this model. It flies very well. RADIO CONTROL REPORT

• If ever I felt like a kid in a candy . . . and also old friend Fred Smith, take care of all the exhibitors, and the store, it was a few weekends back at the better known as Smitty, who is always crowds, while slightly less than last big Toledo R/C Show. So much is al­ at the Coverite booth . . . never was year (probably due to the gasoline ready written about this event that it able to catch him either. shortage), are always packed in like would be repeating everyone else to And the booths . . . my gosh, the sardines. describe it. Nevertheless, for a really booths. There were quite a few more It is impossible to mention all the gung-ho R/C’er like myself, it was fan­ than last year, and although I tried to things I saw, or even to pick out one or tastic. look at each and every item at each more of what I might think was the There is always the chance to see old booth three or four times, I still missed “ best” of the show. The Kraft booth friends, often those you only get to things. was manned by Marty Barry and Cliff bump into once a year . . . then I hear Next year, we were told, the Show Wierick, among others, and of course, that old so-and-so is also there, but in will be held in a downtown Toledo the man himself, Phil Kraft. As busy as two days I never run into him . . . such auditorium with a super amount of he was with interested R /C ’ers, he was as Franz Kavan . . . I knew he was there space. This should be something to look able to chat with me a few moments. He . . . everybody told me so, and I often forward to with pleasure. The county showed me the prototypes of his new went to his booth and never caught him recreation center has not expanded to .60 engine which was most impressive.

"Ed Manulkin, president of Sterling Models, Inc? No, but what is it Hank Hankinsen, president of Sonic-Tronics. Morris Toltsis seated, you want me to tell him when I get back to Philadelphia?" ST is building up an impressive "goodie" line.

14 MODEL BUILDER Phil indicated that the production mod­ els will, of course, be improved and probably not at all resemble those from the "first batch" which were brought along to show there. Production is slated for fall, and later in the year specifications on the engine will be released. Also shown were all the Kraft Radios and the full line of accessories . . . plus a few new ones . . . such as a top for 1-1/2 volt dry c e lls .. . either the doorbell type or the No. 4F square ones. In the top, which is plastic, is a meter, switch, and a lead for your glow plug . . . with this you can tell if your glow plug is any good the moment you hook it on, and also, the condition of your battery. Wonder how many times I blamed an engine when my glow plug battery was almost dead or the plug was burned out? Anyhow, this new accessory should be another winner in the Kraft stable of well-thought-out R/C accessor­ ies. To go into details about the Kraft Dan Santich, foreground, is Top Elite's new "Y'see, if I did spell it 'Chaos,' nobody would designer. The latest P-47 is his. Sid Axelrod radio would be like gilding the lily . . . know how to ask for it in the hobby shop!" and Mike Schlesinger at work in background most everyone knows about the Gold Continued on page 61

"Now don't spread this around, but Kraft has this new system for "Say one bad word about my airplane and I'll get Joe Hancock here the airlines, where the pilot stands on the ground with this great big to Spitfire in your eye!" gold transmitter in his hand and ....

A portion of the huge 2-day crowd that worked its way through the exhibits at the Ed Lorenz acknowledges award from WRAMS WRAMSshow in White Plains, New York. and Elinor McEntee for pioneering in R/C.

MAY 1974 15 Winners in the first pylon race of the 1974 season, at Whittier Narrows: Jerry Silverman (left) in the Standard Class (He is our new R/C Pylon editor), and Kent Nogy (right) in Expert. Larry Leonard (center) must have the magic voice . . . he called for both winners! pylon

By JERRY SILVERMAN ... This month we have a new "by-line" for R/C Pylon. Taking over for a job very well done by Tom Christopher, Jerry will be right on top of it all as he is Dist. X V. P. for N.M.P.R.A.

Taken in reverse order, these races written as a model of simplicity: 500 ÖÄ V tift, offer a logical progression up to Form­ square inch minimum wing area, stock ula I, but more importantly, each offers front rotor .40 K&B engines, any prop, lots of fun in it’s own right. For the and the club provided the fuel, which is uninitiated, perhaps a little background 10 percent nitro. Originally intended as • Although the current Formula I sea­ would be in order. a one-design racing class, the rules have son hasn’t yet started here in Southern Quickie 500 racing takes it’s name been bent slightly by other clubs to California (at time of this writing), those from an airplane o f the same name de­ allow more planes to compete. Even so, of us with high percentages o f nitro in signed by Glen Spickler. A few years the original Quickie 500 design still our blood haven’t been lying around ago, Glen noticed that interest in racing dominates, which perhaps proves the dormant. Any time two or more racers was lagging in his club, the BARKS of soundness of Glen’s idea. The plane get together, with any fiyable planes at Bakersfield, and to perk up the troops, handles extremely well throughout the all, there’s bound to be a race . . . he designed the ideal disposable racer course, and landing one of these is in­ naturally. We’ll try anything, even Ugly and a set of simple race rules to match. deed no chore at all. Sticks if pressed. But two events are Starting with the concept that the rac­ (Another variation is the TOAD. gaining a lot of acceptance in So. Cal.; ing should be kept simple, low pressure, Similar to the Quickie 500, but probab­ Quarter Midgets and Quickie 500’s. and above all, fun, the rules were ly not as fast, it was developed in

MODEL BUILDER 1st Bill Warner, 2nd Ed Keefe, 3rd Steve Wilkins,4th Harry Gould, 5th Lee Frey, 6th Jerry Baranowski. “ As in the Quarter Midget race, win­ ners were awarded custom beer steins and coffee mugs, with the club emblem, race date and placings on them, instead of the usual trophies. Fill ’em up!” If a flyer gets his first taste of com­ petition with Quickies, and wishes to progress up the ladder to fame and fortune, Quarter Midget is the logical step up. Since QM has received lots of publicity lately, I don’t think it is necessary to go into a lot of detail here. I will mention however, that this event is picking up in popularity, and the com­ petition is getting tougher all the time. Racing is still very close, and the idle The Quicky 500, designed by Glen Spickler, along with MB's Toad, are popular for low pressure rule seems to be working to keep the racing that provides a nice introduction for beginners to Pylon Racing. This Quicky slightly bent engines stock, which is very important. Northern California, and was published this event is, quite honestly, relaxing. Not as easy on your nerves as Quickie in the Dec. 1972 issue o f MODEL Pre-race processing involves no more racing, QM is still calmer than Formula BUILDER, wen) than setting up the heats and collecting I. Another typical race report is called To give you an idea of what Quickie the entry tees. We got o ff to a leisurely for here: racing is like, here is a race report from start, with the first heat in the air at "Thirty five flyers entered the con­ the San Gabriel Valley Radio Control 9:00 AM, (most of the flyers and some test, including many flyers from out of town. We had originally planned to fly seven rounds, but due to getting off to a slow start, and because of the high winds that came up in the late afternoon, we called it a day after five blistering rounds. With nine heats per round, and four flyers per heat, there was plenty o f close racing, of which many winners were decided by the last lap. The event League, which sponsored a race in of the workers were awake at that time), was co-sponsored by the QMRC, and Whittier, California on St. Patrick’s Day. and with no trouble at all, got the seven together with their help the race was a “ Now that’s what I call fun racing. rounds flown by 3:30 PM. We are hard tremendous success for all. QM racing, Thirty flyers showed up, we flew seven pressed to get five rounds flown in that like Quickie racing, is very low key, and rounds for a total of 56 heats, with time span in a Formula I race. The most o f the importance is placed on the only 6 workers. No proof of scale, no loose pace of Quickie 500 racing some­ flyer and his ability to be consistent, hassles, no protests, just a full day of times has a soothing effect on the flyers, rather than on the all out speed of the close racing. O f course, close racing has too, I guess, as one guy went out to the airplane. To demonstrate the low pres­ it’s drawbacks, as there were no less line only to find that he left his trans­ sure in this type o f racing, this writer than 9 crashed planes, four o f them mitter in the pits. noted that one flyer had two planes and midairs. (Which is why the planes should "After all the rounds were over and actually loaned his number one plane to be considered disposable.) the scores totaled up here’s how it another flyer in the contest who didn’t "Compared to other forms of racing, looked. Continued on page 57

Latest in chapeaus for the racing clan is modeled by John Brodbeck. Inside view of John's hat, which was cut, punched, and knitted by Sections of aluminum beer cans, holes made by a paper punch. his pretty wife, Charlene. Write to John for the pattern.

MAY 1974 17 Mike Bosch, son of well known German R/C flier, is the R/C helicopter champion of Germany. Here he demonstrates the Kavan Bell Jet Ranger at the Toledo R/C Conference. This model was equipped with the latest head and the stabilizing gyro. CHOPPER CHATTER By JOHN TUCKER

• In the R/C model helicopter market­ place, no news is bad news . . . but for­ tunately, we don’t have that problem around this editors desk; only the won­ dering about which item is the most important, or what drawing Paul Plecan will crank o ff in his whirlwind style! Before I turn our guest editor, Nate Rambo, loose with his fine account o f the Toledo Trade Show, let’s cover some miscellaneous data which has been accu­ mulating on the workbench! Ken Turner, a professional helicopter pilot from Tulsa, Oklahoma, mailed a few pictures of his O&R compact engine conversion of the Hegi-Cobra. He sez the belt-start situation was not to his Semco Model Engineering Co., 113 Graniteville Rd., Chelmsford, Mass 01824, produces a very liking, so he installed the O&R to take complete line of mufflers and adaptors, including models for helicopter use. advantage of the built-in pull cord start­ er! The installation was quite simple, as the pictures show, however, the O&R did not develop as high RPM as the original Veco engine and the bird would not lift o ff the ground. Adding an additional 2 degrees o f pitch to the rotor blades (for a total o f 6 degrees) did the trick and it now lifts o ff with less than half throttle on “no nitro” fuel. Total gross weight with the new engine is 14 pounds. Have you tried the Kavan Gyro­ scope yet? If not, you’d better investi­ gate its potential for holding your nose steady, even on a gusty day. (I mean your helicopter’s nose, dodo!) Herr The new Kavan "Alouette" should become very popular, especially with its price tag in the Kavan was kind enough to provide me $165.00 range and its small size . . . for .19 engines. This is the prototype .

18 MODEL BUILDER John Werne's beautifully finished Graupner Bell 212 was one of 17 choppers on display at the Toledo Conference. John used Hobbypoxy for this job.

John Simone, who runs Kavan's U.S. operation in Santa Ana, Calif., flying a Jet Ranger. Mark "J. L. Seagull" Smith, left. Note strong wind.

with one of his little gems and I prompt­ ly installed it on my brand new Jet Ranger. After reading the data sheet carefully and consulting with those great guys at Orbit, the actual installa­ tion was simple and direct, with no modifications required. The first test hop (for both helicopter and Gyro) was completely uneventful except for minor trim adjustments, and increasing the Gyro’s sensitivity pot for more precise control. Actually this chopper flies so well and is so exceptionally stable, I really couldn’t tell if the Gyro was working or not. That is, until I turned Schluter's new "Gazelle" features collective pitch rotor head. It was flight demonstrated at Toledo by Dieter. Floats make nice trainer rig on solid surface. it off and tried hovering in a gusty 20 knot crosswind! Well, I’ll tell you it in his report. And that naturally leads for 2,509.87 meters, which is expected was working and doing a beautiful job us to our guest editor and helicopter to be a world’s record for R/C choppers, of flying . . . for my money, it’s a great pilot “extraordinaire.” Nate Rambohas when substantiated. N u ff said. Nate . . . training aid for the beginner and will been building and flying R/C choppers fire up your pen! make a good pilot an expert! for several years now, and is responsible Although there are many model hob­ Speaking of Kavan, the prototype for some outstanding scratch-builts in by trade shows in this country, Toledo’s "Alouette” is being shown around the the Southern California area. He recent­ is no doubt the biggest and best. For circuit, but I ’ll let Nate tell about that ly flew his helicopter in a straight line Continued on page 59

Ken Turner, professional helicopter pilot from Tulsa, Oklahoma, Here's the O & R all snugged in. Pitch of blades was increased to 6 converted his Hegi Cobra to O & R power. Total weight is 14 lbs. degrees and now the chopper lifts off at less than half throttle.

MAY 1974 19 These plans also published plans also These in the April, 1974 of WINGSissue magazine.

Copies of the original 28 x 40 inch drawings of the Douglas 0-43A are available at $4.50 a set. 2 0 Order direct from PETER WESTBURG, 834 Seventh St., Santa Monica, California 90403. M O D E L B U IL D E R The ancient Morane parasol wire bracing was still a feature of the 0-43A . Small vertical tail was soon changed to larger size.

DOUGLAS 0-43A (PART 2) By PETER WESTBURG

A later Wright Field 0-43A with landing lights for night flying. A Blue and yellow 0-43A of the 22nd Observation Squadron, a pursuit loop antenna and wing flaps have also been added. squadron in WW I which switched to observation in the 1920's.

No. 3 of the 111th Observation Squadron which flew 0 -43A ’s from Prototype of the 0-43A was one of the Y10-43's. Note the short 1935 well into 1942. nose, reworked cockpit, and belly blister.

The 0-43A at Wright Field with new increased vertical tail area and inset rudder.

MAY 1974 21 This is a package deal evaluation, including the Kaos, Veco .61, Goldberg retracts, and World Engines' "Blue M ax" radio. Top Flite prop. PRODUCTS IN USE "SUPER KAOS" 60, "BLUE MAX" MARK II, K & B VECO .61, GOLDBERG RETRACTS. By Bob Upton

• The following article is a “ total pack­ mitter. Since my electronic background age” evaluation starting with the “ BLUE is rusty to say the least, I had two M A X ” MARK II six channel radio separate individuals (who will remain manufactured by World Engines, Inc. nameless), both highly competent tech­ The radio sent for evaluation was happi­ nicians for competing radio manufac­ ly the Mode II version on a six meter turers, evaluate the radio on an oscilli- frequency (53.3), the frequency I nor­ scope, and except for a little servo mally use. Since I ’m a firm believer in chatter (quite harmless as pointed out FCC regulations relative to being proper­ on page 9 under “servo notes” in the ly licensed, my Ham call number is World Engine radio instruction manual), WA6LKH. the radio checked out quite well as The radio is modern in every re­ to RF output, range, servo resolution, spect, including a retract switch in the etc. It is beautifully packaged and the Aileron and retract servos located in the top upper left hand corner of the trans­ instructions are thorough enough to center section of the wing. Plenty of room.

Heard the expression "full house?" Well, here it is! Switching device Goldberg retract nose gear in sucked up position. Note pressure tap retracts just above receiver. Separate dry pack is below and to right. line from Veco muffler. Fuselage and spinner blend nicety.

22 MODEL BUILDER How to land if the linkage comes off the nose gear! This is not a posed shot. All photos on this page by Frank Capan. keep even the rankest of amateurs out the screws! Caution should be exer­ early “ Sun Fli” series, and have yet to of trouble. cised when tightening the servo arm find much to complain about. I can say I like the carrying handle on the screws in the servos when installing without reservation that Joe Bridi has transmitter. I do advise, however, that push rods, etc. The arms cracked verti­ very few competitors who can equal the the transmitter, being quite narrow in cally through the base that surrounds quality of the products put out by his depth, be either laid on its back or the output post of the servo. company. supported in some manner, because I I installed the radio in joe Bridi’s I installed Carl Goldberg’s retract had it blown over a couple of times. “Super Kaos" (60 version), manufac­ system that is· so highly acclaimed by The closely spaced rubber pads on the tured by Bridi Hobby Industries. The many top competitors. I also used Carl’s bottom of the transmitter make it a well known, and I might add, well liked new dry-cell actuated retract servo with little unsteady in the breeze when stand­ Joe Bridi produces an outstanding kit. I the micro-switch servo actuating mach- ing upright. (I fly when it’s windy, as the have visited Joe’s manufacturing fac­ anism. Carl suggests activating the servo wind keeps the weak of heart on the ilities, and the equipment and talent by using high and low throttle trim. I, ground, hence the sky is unencumbered exhibited therein staggers the mind. No however, used the Goldberg servo to by semi-controlled model airplanes!) “die crushing” for Joe. He cuts, saws pull up the main gear, and a “ BLUE I had one problem that I feel should and sands every part to very close tol­ M A X ” servo to retract the nose wheel. be remedied by World Engines. The erances. The balsa supplied in each kit The micro-switches are operated by the servo arms should be beefed up. I is of very high quality. I have built push rod connected between the nose cracked two of them just by installing many of Joe’s kits, starting with his Continued on page 60

Chief Pattern Judge for the 1974 Nats, Bob Upton, tunes the Veco With gear retracted, the Kaos becomes an even cleaner aircraft as it for a test flight while son, Steve, provides the anchor. makes a fast low pass for Frank Capan's Leica.

MAY 1974 23 R/C SOARING . . . has nothing to do with color schemes, pin stripes, and such . . . has to do with making silk and dope purses from the ears of pigs . . .

• The art and science of adjusting an flight trim may be, one fact is basic: a acteristic: it is either stable, neutrally R/C sailplane for proper flight can be high performance sailplane must be a stable, or unstable. Now this can get likened to tuning a piano. The whole stable machine. That is, some amount of involved rather quickly, so hang on and instrument must be tuned . . . or automatic, positive stability is essential we’ll dig our way out together. It ’s trimmed . . . for optimum performance. to thermal soaring. Look at it this way: kinda important because stability and Anything less can only compromise no other type of model aircraft is "trim ” are very much interrelated. potential. operated deliberately at distances even There are two kinds of stability; Now just what is considered to be approaching those considered normal static and dynamic. Static stability can proper flight adjustment by one person R/C sailplanes. When these distances be thought of as the inclination for might be completely unacceptable to are beyond the range of the pilot’s automatic correction. Dynamic stability another. The flight trim of a sailplane is visual acuity, the sailplane cannot be has to do with the quality of such very subjective; it will vary with the controlled with adequate finesse for correction and can exist only in associa­ skill and preference of each pilot. It efficient . . . or sometimes safe . . . soar­ tion with a condition of static stability. can also limit overall performance, no ing performance. This is true enough in That is, a sailplane cannot display dyna­ matter how expert the pilot. Or make directional control . . . “Which way is it mic stability unless it is a statically Ole Dummy look like a champ. turning, George? Is it cornin’ at us or stable configuration. Most good sailplane designs are toler­ goin’ away?” . . . but even more critical Static stability implies that a body ant of a rather wide margin of trim ad­ with pitch attitude. . . . such as an R/C sailplane . . . tends justments. Others, however, can be­ The rotary motions of any airborne to remain in a state of equilibrium, or come quite a challenge to control if craft in free flight are defined with refer- tends to return to a state of equilibrium they are not balanced aerodynamically ance to an axis system formed by three after having been disturbed by some within relatively close limits. This short­ mutually perpendicular planes intersec­ outside force such as a gust o f wind or coming . . . or more kindly, lack of ting at the center of gravity (Figure 1). control surface movement. For our pur­ flexibility . . . usually results from These motions are pitch, yaw, and roll; poses, equilibrium is steady, unacceler­ inherent design features which can be which refer to longitudinal, directional, ated flight. Thus, a sailplane is statically improved only by major rework of the and lateral displacement or movement. stable if it has a tendency to follow a structure. For each mode of displacement, an air­ given glide path at a constant speed and Whatever individual preferences for craft has a corresponding stability char­ fixed attitude. It is also statically stable

24 MODEL BUILDER FIG. 3 FIG. 2 if, upon being disturbed, it tends to return to its original state of steady, un­ accelerated flight once the disturbance has passed. Conversely, a statically unstable sail­ plane does not have automatic recovery characteristics. It will deviate from a given flight condition without outside influence. A sailplane that is neutrally stable sorta just doesn’t give a damn. It’ll go along until something upsets it, but once that occurs, it has no tendency either to return to steady flight or deviate further from the new, upset condition. (This is ideal for aerobatic aircraft.) Dynamic stability is demonstrated by the way in which a statically stable body returns to its state of equilibrium. Assume that a gust has caused a sailplane to pitch nose upward into a stalled con­ dition. Static stability exists if, following the upset, the nose automatically lowers and recovery is initiated. The sailplane will probably overcorrect (oscillate) a few times (cycles) in its search for the original glide path. That is, when the nose drops flying speed will increase beyond normal glide velocity. This gen­ erates excess lift which, in turn, causes the nose to rise above the normal glide angle. This upward rotation continues until excess velocity is dissipated, but usually too much air speed is lost and, again, the nose drops below the glide angle. Continued on page 65

MAY 1974 25 Tips of the Drifter's one piece six foot span wing are protected by plywood tip plates. Machine cut parts make for fast assembly. PRODUCTS IN USE

CRAFT-AIR "DRIFTER", by Fernando Ramos

• Next to F/F scale and old timers, I applied. The stab and the rudder are all effort. However, with too strong a enjoy the peace and tranquility of R/C sheet, and the only task here is the head wind, the penetration, at its origi­ Soaring (LSF 123). This is truly a relax­ hinging of the two. I would caution you nal weight, isn’t very good. It would ing way to fly models. I previously had to use the thinnest hinges available, or probably improve by adding ballast. a high performance sailplane which try the Monokote hinge as described in For anyone wanting an inexpensive, suffered a rather abrupt demise. I need­ the instructions. super-easy sailplane (even for a beginner) ed a new sailplane; one which would go It took one weekend to completely to build and fly, the Drifter is definitely together fast, without complicated frills build the Drifter, and that wasn’t spend­ one to consider! I have flown mine and gadgets. This Drifter project was ing the whole day in the process. It is regularly for the past 3 months with just the ticket. All parts are machine definitely easy to assemble. The wings great enjoyment. · cut and the design is simplicity personi­ and tail were covered with Super Mono- fied! kote, and the fuselage was given a couple Wings are definitely not my favor­ of coats of K&B epoxy primer (This ite part o f an airplane to build, and sail­ is sure one great product!). This was planes with their long spans sometimes sanded thoroughly between coats, then become tedious. So, I decided to build sprayed with white nitrate dope. The the wings first. Six feet of span on a tail was attached to the fuselage and the sailplane isn’t too bad, and before I radio installed. I used my reliable Kraft knew it, I had completed the wings, 3 Channel series 71 radio. with only the sanding and covering still The wing was attached to the fuselage to do. My only criticism o f the wings with rubberbands and the CG checked. was that the notches for the upper spars It seemed to be O.K., with no additional on each tip section didn’t line up. It ballast required. I checked the controls didn’t take much to remedy the prob­ and everything was working. The test lem, but is just an additional step. flying was from a high bluff in Orange (Craft-Air has corrected this in its pro­ County. I gave the Drifter a heave and duction run o f kits, wen) o ff it went. I found that I needed some The fuselage was tackled next, and down trim to keep it at a level altitude. it, too, went together very quickly. No The Drifter seeked out a couple of modifications were made, and the plans thermals and the total flight time for the were followed to the letter, including first two hops was 45 minutes. the constructional sequence as detailed The Drifter is definitely a light air in the instruction booklet. The control sailplane. When the strong breeze sub­ The author built his Drifter in one weekend, cables recommended were used and in­ sided, it could still be flown against the without working full time. Finished in white. stalled before the top sheeting was ridge, gliding back and forth with little

26 MODEL BUILDER If you get into FAI Team Racing, you'll probably get yourself one of these engines, and if you're like Jed Kusik, you'll modify them with Cox carburetors. From left to right: Italian Kosmic, Czechoslovakian MVVS, British Eta Elite, and Italian Super Tigre . . . all .15 diesels.

------o ------"FROM THE HANDLE" ontrol line By JED KUSIK

• My article last month was dictated fought so well as the California North- The new circles are really beautiful. The to all readers from atop the local soap South Series. I attended one of each Valley Circle Burners now have three of box, and was probably sermon-like in since my last typewriter session. I only the best paved racing and stunt circles quality. That means that half of the regret that I wasn’t able to stay for the in the country. readers were asleep, one-fourth disagreed entire contest both times. The San jose The racing at both contests began with what I said, and one-fourth weren’t club has an excellent battle field . . . with what has become the socially ac­ at all interested anyway. The fact is, which is sometimes used as a high ceptable upper class of racing in Calif­ I have to write something each month, school. The asphalt parking lot has ornia, namely FAI TEAM RACE. FAI and for lack of suitable material from enough room to set up four flying racing is growing in California so strong­ the readers I will always resort to my circles. The grass athletic field is at one ly that there are now more teams in the own personal opinions and interests. end o f the parking lot and is nice and state than showed up at the last Nation­ (A guaranteed method o f getting mater­ soft for the combat crashes . . . er . . . als or at the last two Team Trials. I feel ial! wen) The only way that I can be matches. Sorry. The great and glorious that the reason FAI is becoming so kept from doing that, will be if the South, (Bet you can’t guess where I respected is that the rules have been so readers (those whom I still have after live) stages its half o f the series at the well written that they make the event last month) write in and tell me what famous Sepulveda Basin. The Basin has fair to anyone who would like to com­ they would like to see in print. Please changed a lot in the past few years. A pete. The rules are specific and define don’t tell me where to git off, that has new road, Burbank Blvd., goes over the exactly what is allowed and what is not already been taken care of. dam and through the old Radio Control acceptable. When an event director ad­ Hey, wow! The Civil War was never site. (The relocated R/C site is better.) heres strictly to the rules, including call-

Oenny Schauer restarts Slow Rat fitted with ST 35 converted to die- Dan Barker restarts his FAI Team Racer. Note pressurized refueling sel. Note Allen key in mouth and finger guard, standard equipment. system strapped to his arm. Valley Circle Burners meet, March 17.

MAY 1974 27 Before the race. Confident Les Farah with After the race. Les is still smiling in spite of 4 stitches in his hand, because his pilot neglected to Larry Jolly's "Lady Catherine" FAI racer. slow down for landing. Ahem . . . the pilot was Jed Kusik. Gerry Manser with stop watch & pipe.

All those in favor of transparent covering material say "A ye!" Trouble with it is that your Jim Fults prepares for a winning Combat helper may take a long time getting the engine started! match. Sepulveda Basin, March 17. ing of fouls and disqualifications, the Those arguments have become painfully the challenge becomes a very great one. result is a truly enjoyable racing session all too common at Goodyear and Rat Sigh! I could talk about FAI for where all contestants know exactly what contests. ages. . . and I probably will... so every­ to expect. It is also not a requirement Perhaps another reason for the popu­ one had better start liking the event! to follow each heat or event with an larity of FAl is that there are so many After everyone had their fill of the argument en masse about who did what different variations and approaches from good racing stuff, it was time to force and who is more right or more wrong. which a team can attack the event that one’s self into a bad, grumpy mood to be on the proper level for Rat and Good­ year. Luckily, my partner broke his Rat in the pits, and I was granted reprieve from having to fly that event. With a short bit of freedom at hand, I decided to do something about the Saturday night head I was carrying around, so found a cool, safe place to wait out the Rat races. It ’s still semi-winter here and the temperature was only 80, so I actually got under my car and went to sleep in the grass for an hour or so. The Goodyear racing turned out to be the now typical, who-can-restart- their-$ 100.00-plus Aldrich/Nightingale/ Sheldon-tuned Rossi. Goodyear could be run so much faster if all the pit men would line up their models and on ap­ propriate signals, start, burn down, and try to restart their engines. Slow Rat was run long after I left each contest, but I did witness a new approach to this limited fuel capacity event. Denny Schauer has a Supertiger 35 converted to diesel-ignition. The en- "What's the matter . . . ain't you never seen an 'original' before?" Continued on page 52 28 MODEL BUILDER 1. FULL LENGTH 3 BASSWOOD CRUTCH 2. 3/8" BA SSW 0 OD 3. 3/8" BALSAWOOD F.A.I. T E A M RACER 4. 7/8" b a l s a w o o d BY 5. I/4" BALSAWOOD JOHN McCOLLUM AND AL HODGKINS 6. 3/4" BALSAWO OD FOURTH PLACE '72 WORLD CHAMPS F IR S T PLACE '74 U.S.A. TEAM TRIALS

FAST FILL AND POWERED BY A.R.M. DIESEL

MAY 1974 29 It's a free flight! It's a Ukie! Iťs an R/C! . . . Nope, it's a kite! How do you like that?! See the text for more details.

FREE FLIGHT SCALE By FERNANDO RAMOS

• This month’s column will cover the 1/32, 1/16, 3/32 and 1/8. In addition, eering, 32 Farley Road, Scarsdale, N.Y. numerous new scale products that are they have Marlow rubber winders in 10583, came out with four Peanut plans now available. First of all, the popular­ either 16:1 or 9:1 ratios. The latest is a for the Jodel "D " 150, Wittman Tail­ ity of Peanut Scale is ever-increasing designer kit for large rubber models. wind, Fairchild PT-19, and the Reed throughout the nation. This is evidenced Each kit contains (2) 7 ” props, (2) Clipped-Wing Piper Cub. Since then, by the availability of more new kits, 9-1/2” props, (4) No. 3 prop shafts Janick has come out with four new plans, and accessories. Many died-in- (2-1/2” long X 3/64" diameter.), and plans . . . Rearwin Speedster, Corben the-wool R/C’ers are turning to this in­ one dozen brass thrust washers. This is Baby Ace, F-6 Fleet biplane (this one expensive, pleasurable modeling form. a $2.25 value for $1.75. On top of all is particularly nice . . . it has to be, it In the center of this activity, is Peck- this, Peck is coming out with four new has two wings!), and the Bellanca Polymers. Bob Peck doesn’t need any Peanut kits . . . the Andreason biplane, “Cruisair.” Each plan is very well done. introduction, because his kits are really Nesmith Cougar, P-51 Mustang, and the I built the Tailwind, and it went to­ popular. Peck-Polymers is fast becom­ japanese Zero. Each is a little beauty gether easily and flies beautifully. ing the Peanut capital of the country, and above all flies extremely well. I Before going on, about a month ago as its new 6 page brochure will attest. have seen each prototype fly, and am the San Diego Orbiteers, one of the local The company handles... in addition to looking forward to seeing these new F/F clubs, sponsored a Penny Plane its own products. . . Hungerford spoke kits as they become available. For fur­ contest and they added Peanut Scale. wheels, Walt Mooney and Bill Hannan ther information write to Peck-Poly­ There were quite a few modelers flying plans, William Bros, wheels and dummy mers, P.O. Box 2498, La Mesa, Calif. Peanut. The reason for mentioning this engine cylinders, and contest rubber in 92041. is that Peanut Scale has really become a 16 foot lengths in the following widths: Sometime ago, Janick Model Engin­ tough event to compete in. For example,

Another view of the remarkable all-foam SE5 kite, showing hand Tern Aero's neat little Starduster for .020, can be flown free flight carved propeller that comes with the "k it." or R/C, using one of the small Ace pulse units. See text for details.

30 MODEL BUILDER i «

Harold Bennett launching his beautiful DH Tiger Moth with which he has won many contests.

Bill Warner was flying a Lacy homebuilt Hal Swanson has gone through a lot of Tern’s only gasmodel, the Starduster, (no dihedral) and it was turning in 86 work in developing this particular plan. is quite a kit. I finally finished mine so second flights! Not far behind was Walt The cost is $1.50 + 50 cents postage. I would like to pass on a few comments Mooney and hir- magnificent Miles Spar­ For further listing of numerous scale regarding this fine model. First, there row Hawk (featured in this issue), and plans, send a self-addressed envelope to are nine sheets of printwood! I have Jed Kusik (Our Ukie editor! wen) with Modernistic Models, Box 6932, Bur­ not seen anything like that since I was a a Peck-Polymers Piper Cub. These are bank, Calif. 91510. youngster, oh, so long ago! There are what I consider true Peanuts; they are Tern Aero (love that name) will be four full pages of drawings, each with scale, but do they fly! All I can say is coming out with new scale rubber mod­ constructional photos. As with any kit, that I ’ve gone back to the drawing els. One new kit, which is not scale, reading the directions and studying the board. At die rate I ’m going I might is called the. Aerobug. This is Tern’s drawings is a must. The model goes to­ as well stay there. Those good old 35-40 contribution to the growing need for gether very quickly in spite of all the second flights are gone forever. inexpensive and practical kits for the cutting one has to do. I prefer to cut as While on the subject of plans, Mod­ beginner. It is truly a nifty 16 inch span I need rather than to cut everything out ernistic Models has a new 3/4 inch scale model that any junior can build and fly first. The Starduster can be made into plan of the Mr. Mulligan. This model is with minimum effort. This new kit is an R/C if one chooses. I've made mine suitable for either rubber or gas power. No. 110 and is priced at $1.75. F/F. Continued on page 58

Ace photographer Bob Clemens on the other side of the lens for a Jack Russ, Detroit Cloudbusters, lets fly with his Peanut Folkerts change, launching his Peanut Nesmith "Cougar.'' "Toots," built from raceplane plans book.

MAY 1974 31 32 MODEL BUILDER The ideal sport F/F gas model should look like a real airplane, as does this little job. "If I'd known you were coming, I would have put something on!" 1915 L I H BEACHGY MONOPLANE By ART REINERS . . . Here's an .020 powered sport free flight that is also semi-scale . . . and different enough to be a real attention-getter at the local flying field. Construction is super-simple.

• For all the .020 engine fans, here is a the glue has set, insert the wing spars shown on the plans. Be sure to wrap the “Jumbo Peanut” of an Old Timer you into the ribs before taking up the panel. wire joints with 3 or 4 turns of soft iron can build just for fun. Turn the plan over and repeat the wire and solder securely. The front Pre-WWI aeroplanes have always been process for the right wing panel. I wheel is installed when the front gear is my bag, so to speak, and my interest used Titebond glue for all framework bent. Use Williams Bros. 1-1/2 inch increased by leaps and bounds when I and followed it up with one coat of Antique wheels. Set assembly aside to began building some of the Hannan and clear dope before covering. When the install in the fuselage. Mooney Peanuts. This inspired me to go panels have been sanded, insert the wing FUSELAGE a step farther and double the scale to wire retainers and glue solidly in place. The fuselage is easily built from 1/8 accomodate the .020 and .010 engines Be sure to leave at least 1/4 inch of sq. hard balsa or 3/32 sq. spruce strips. that I had around. leading edge and rear spar to set into Make the 2 fuselage sides directly over To date I have built 4 of the Lincoln fuselage sides. the plan and join together, starting with Beachey models with great success. It TAIL ASSEMBLY bulkhead 1 and working aft. Fill in the is very stable and flies with amazing Rudder and elevator are made next areas indicated with 1/8 inch soft balsa realism. The first L.B. was assembled and can be built at the same time as the and add fuselage formers No. 2 and 3. about 4 years ago and has survived all wing panels. Sand the tail parts to Cover top and sides with 1/32 inch of the usual testing until recently, when streamlined shape and apply one coat medium balsa and cut cockpit opening. it collided head on with a telephone of clear dope. Install landing gear and cover bottom of pole. The damage was not total, but LANDING GEAR fuselage with 1/32 inch medium balsa bad enough to warrant a new, revised Assemble landing gear from 1/32 sheet. Sand the fuselage completely and model. Since the first model was slightly inch music wire, using the dimensions Continued on page 61 heavy, some changes were made to the wing, tail, and covering to provide a lighter, stronger model. Changes were also made to bring the model closer to scale. The Beachey Monoplane was a mid­ wing aircraft designed and built for Lincoln Beachey, the famous aerobatic pilot of the early 1900's. Begun in 1914 and completed in 1915, the aircraft was built to be used for air show work. The original A/C was equipped with a 7 cylinder Gnome Rotary engine of 84 HP which gave it a top speed of about 105 mph. Since I like to build fuselages and hate to build wings, I assemble the wings first to get them out of the way. WINGS Cut all wing parts and assemble over Framework shot reveals the simple construction of the Lincoln Beachey. Plane will fly well plan to make the left panel first. When with or without cowl, but looks a little better with it in place. Make the effort.

MAY 1974 33 Rare old wind-driven radiator cap (bicycle?) . . . being a collection of aeronautical happenings that might ornament was copy of Lindy's "Spirit" nose. otherwise go unnoticed . . . Found by Ginger Warner at swap-meet. AT LAST! PEANUT SIZE WOOD! Calif. 90808. Additionally, the flat colors seem to Good news for all Peanut Scale AND SPEAKING OF MATERIALS dry more rapidly, although perhaps not fans: There is a new source of materials Model materials are to be found in as fast as the more familiar pigmented sized especially with you in mind. This places not usually considered by the dope. first-quality balsa will enable you to average builder. Everyone knows that Some of the best colors are not build lighter, and therefore better per­ magnesium is one of the lightest metals, found in the plastic model section of forming models, with no additional but seems not to be readily available in the stores, but rather over in the craft effort. As you know, the smallest size small quantities. However, if you will section. This sort of paint is intended strips heretofore available commercially, simply locate a store which stock PER­ for use on styrofoam, artificial flowers have been 1/16 inch square. Also, these FECT brand chemicals, you will find and such, which might be the reason so-called 1/16 inch square strips are that magnesium ribbon is available in you avid aeronauts have not noticed it. typically somewhat oversize, resulting 12 inch long by 1/4 inch wide strips for Hówever, some really choice flat finishes in Peanut models that are stronger (and a very reasonable price (locally 35 cents). are available in spray-can form, including heavier) than they really need to be. Tliis material is easily cut and bent, and rich shades of tan and brown, which The truly dedicated types have been can be useful for a variety of small are perfect for wing struts, props and stripping their own, but this can get to items, especially on scale models. Addi­ other items found on vintage aircraft. be a real drag, and wastes time which tionally, it is sold in handy size glass MODEL LONGEVITY might otherwise be applied to actual bottles, which are useful for thinner When we were kids, we simply took building. storage, etc. it for granted that a model was only A few of the "ghost ship” builders CRAFTY PAINT HINT supposed to last for two or three flights, have employed 1/32 inch square strips Here at the hangar we often use right? If someone told you they had a in their Peanuts, but these are very plastic model paint for detailing small model that was, say, a year old, you fragile, and bow inward unrealistically flying models. It isn’t fuel proof, but knew they had to be referring to a when their covering is shrunk. The works fine for rubber or CO2 powered “shelf model,” or that they were just answer to this dilemma? . . . 1 /20th rigs, and offers the advantage that it is “chicken” about flying it. Now, how­ square strips! And, matching thickness available in a large variety of colors in ever, long-term flying models are be­ sheet and rectangular strips to boot. For small quantities. We find that the fiat coming more and more common, with more info on this balsa, drop a stamped colors are more realistic in appearance three and four year-old examples being addressed envelope to: Premier Com­ than the shiny colors, which tend to frequently seen, even in competition. pany, P.O. Box 8264, Long Beach have a sticky look, even when dry. Continued on page 60

Doug Fronius in his "Really Big Model" hang Vic Larsen built this Halberstadt D II from a Lee's Hobbies Peanut Scale kit. It does 30 seconds glider, designed by Waldo Waterman . . . Yes! indoors. Photo from Texas by Caldwell.

34 MODEL BUILDER Who said low wing scale models don't fly well? This one has flown 53 seconds indoors. . . . Maybe it's because Mooney did i t . . .

PEANUT SCALE Miles Sparrowhawk

By WALT MOONEY . . . Our perennially prolific Peanut perpetrator produces positively perfect projects. .. period! As proof (whoops!), here's a sleek low-winger that continually pushes (oh dear!) a minute indoors.

• The Sparrowhawk was a special rac­ of the flying configuration is in order. two coats, the model has a single coat ing machine designed by the Miles air­ The model was built with care to of thin, clear dope. craft firm in England. There were sever­ make it light, and it weighs one half an The wings were built flat over the al of them built and they were fairly ounce without the rubber motor. It plans (using the flat bottomed ribs) successful. In shape, they are classic for could be lighter if superfine tissue were and after covering and doping, they their period in aviation history. I found used for covering, but because the real self-warped to give one eighth of an inch the model to be particularly pleasing, "G-AGDL” was red and cream, we used of washout at the trailing edge of the both for its looks and for its flying Marlow Engineering tissue, which has a tip rib. That is, the tip rib is twisted ability. It flew “right o ff the board,” pale yellow as one of its available nose down relative to the center section and the best flight to date was 53 colors. The top decking was 1/64 thick ribs. For good flying, this twist is essen­ seconds in a contest at the Santa Ana balsa from former 2 to 8. If that is un­ tial, so if your wings don’t warp auto­ Blimp Hangars. available to you, use bond paper . . . or matically, make sure you do it to them. Before going into the construction of sand down some 1/32 sheet! With the The best motor found so far, con- the model, a more detailed description exception of the fuselage which had Continued on page 56

I

Come to think of it, maybe it isn't just Mooney! This little ship has Build the Sparrowhawk and try to beat Walt's time of 53 seconds. nice free flight proportions. Let's have a "Beat Mooney" contest. First one to do it at a contest will get a free subscription.

MAY 1974 35 1/16 BY 1/8 LEADING EDGE 1/16 TH SHEET WING TIPS 1/16TH SQUARE SPARS (5) CENTER RIBS 1/16TH SHEET, OTHERS 1/32ND SHEET

USE 1/32ND DIA. PIANO WIRE FOR LANDING GEAR AND PROPELLER HOOK FRONT VIEW

PEANUT SCALE "MILES M-5 SPARROWHAWK" BY WALT MOONEY

MODEL BUILDER MAY 1974 By BOB STALICK

• Since taking over this column for issue. So, I thought to myself, how can should cause a little head-scratching. MB, I have tried to present some per­ I tell this poor deceived fellow that such Good luck. With the new handicap tinent F/F information in a semi-light- a book doesn’t exist. Then I read the system installed on this feature, aimed hearted (some say, light-headed) fashion. letter more carefully. It was signed by at making it more competitive for non- One of the risks in doing so is that Hornbeet ). Murphman o f Dallas, Texas, Californians, everyone in the country someone out there is going to take me with the check emanating from the should have an even shot at winning that seriously in the wrong place. For ex­ Frauders and Defaulters National Bank free subscription. ample: I received a letter with a check in Dallas. Whose leg is being pulled? DARNED GOOD AIRFOILS for $15.00 to cover the cost of the Hornbeet, wherever you are and whom­ THE MOUNTIE book, How I Trained for the Indian ever you are, thou pullest my leg - - and The Mountie airfoil is an excellent Wrestling Championship o f Snyder I appreciate it. all-weather and all-around A /2 section. Swamp, or, 200 Sneaky Ways to Beat MODEL OF THE MONTH Although not an out-and-out still air Fast Richard. This order is a result of This model is a sneaky one. With an foil, it is probably one of the best, if the “humor" feature o f the February 84 inch wingspan for a 1/2A engine, it not the best, for usual contest condi-

Small unlimited rubber model designed by John Clear around the Tom Stalick, F/F editor's son is a picture of concentration as he pre­ Estes BT 55 rocket tube. Uses 8 strands of 1/4 Filati. Really goes. pares his Wasp powered Fu-Bar for a flight. He's 9 years old.

38 MODEL BUILDER Fuse lighter attached to tailgate of station wagon. Seen at contest in northwest. tions. This is the foil which was used by Elton Drew on his Lively Lady, winner of the 1971 FAI World Champs. It is also the foil used on this month’s feature plan, The Chickadee. Try it. THE CHICKADEE STORY, CONT. Last month, I began to relate the MAY'S MYSTERY MODEL story of the development of the Chick­ adee, as related by Bill van Dieren, in on the model, without damage to the Hot Head. The conclusion to this story wings. follows: “ One problem I could not overcome “ I provided the detailed drawing of was a bad stall at every release when the model, now named “The Chicka­ there was the slightest amount of pres­ dee,” and joe Bilson made a very versa­ sure on the model. It was finally solved tile set-up for mass producing the wing with a gadget which locks in the tow­ ribs, riblets and gussets . . . as well as a ring, and at a set pressure, throws the good jig for building the wings. rudder to glide turn. This lock allowed "Three models have been completed the model to turn prior to full release. and three more are on the board. This problem intrigued me.. .an answer Weights (in grams) are as follows: was required . . . and found in ‘Circular Model No. 1 No. 2 No. 3 Airflow’ by Frank Zaic, where the plot­ Port Wing 95 89.5 89.75 ting of pitching moment curves are ex­ Starboard 95.5. 89 89.5 plained. Stab 8.5 8.5 8.5 "The resultant investigation indicated Fuselage 135 155 161 that a 4 degree wing angle showed too Ballast 79 70 61.75 much positive pitch, and the wing at 6 Totals 411 412 410.5 degrees shows only a small amount of All models fly right turn. The port positive pitch. So, the second model wing tip was washed out 3/16 inch and was built with a wing angle of 6 degrees, starboard tip 1/8 inch. hoping that the curves would be reason­ "My first model was built with the ably close. The flying of the model con­ wing angle at 4 degrees, since 6 degrees firmed that there was still a little posi­ appeared too much in comparison with tive pitch left, but with no ill effect to other models. However, all other details the model.” are as shown on the drawing, except This is an excellent model for build­ that the pod was made up from solid ing for the contest scene for this year. pine. The airfoil is the Mountie. Flying Full-sized plans are available from Don the model was quite successful, as it Murray, No. 1, 2205 West 6th Ave., compared very well with my favorite Vancouver, B.C. V6K 1V7. model. However, the strength o f the A note in closing, Bill uses the new model was superior. The wires have Russian style towhook on his Chicka- bent up a couple of degrees several Continued on page 69 Close-up shot of Bill van Dieren's Russian tow- hook system in his Chickadee A/2. times when too much pressure was put CHICKADEE A/2 PLANS NEXT PAGE

MAY 1974 39 40 MODEL BUILDER That's what an alpha-cyanoacrylate ad­ hesive is. The Consumer Product Safety Com­ mission halted distribution of such ad­ hesives for consumer use pending public hearings. As of March I, the guy in the local CPSC said the ban was still in ί force, but that the hearings had been held. Then my wife told me that Paul NATIONAL FREE FLIGHT SOCIETY NEWS Harvey said the ban had been lifted. So you can now all go out and stick your SUPER MEMBERSHIP DEAL according to AMA Category II Rules, fingers to your secretary’s noses, and it Last year at the Nationals, those of namely: 11 sec. ROG/VTO/ROW , 9 will be legal. If that doesn’t appeal to you who were there may remember my sec. hand launch, 3 official flights, 3- you, you can use it to glue Rib A to saying that increasing the NFFS Mem­ min. max. Flyoffs: hand launch, first Spar B. bership was not a one man job but flyoff 7 sec., additional flyoffs 5 sec., Included in the list of adhesives in would require the cooperation of all 3-min max. this general category are Krazy Glue, members. I suggested at the time that ALPHA-CYANOACRYLATE Permabond 102, Super Three Cement, if each member were to go out and get ADHESIVE O.K. Zip Grip, Rapid Set, Superbonder, Zip one new member we would obviously Remember that pre-Xmas office par­ Bond, Eastman 910, One Drop Oneida double our membership very rapidly. ty? The one where Ellis was telling Instant Weld, and we have a sneaking Some of you did just that and you de­ Polish jokes while Pauletich was telling suspicion, Satellite City Hot Stuff. serve a great deal of thanks. Italian jokes while Morpurgo was telling If you haven’t tried it for things like I now have a plan that should not Jewish jokes while Abie Glicksman was sticking a piece of aluminum tubing to a only make it easier for you but save telling Christian jokes . . . and they were piece o f music wire, where soldering just you some money at the same time. the same jokes? And some card put a won’t do, you’ve missed something. O f course, it is great for repairing busted The plan is this: Each current Open drop of something on your finger and models, and for assembly of balsa parts or Senior member who sends in his re­ conned you into touching your finger too, according to a usually reliable newal check accompanied by an appli­ to the secretary’s nose? And they didn’t source . . . namely me. · cation and check for a new member will get you unglued until New Year’s? receive a 50 cents reduction in the cost o f his dues plus a 50 cents reduction in the cost of tire dues for the new mem­ ber. If you send in your renewal with two new memberships you will receive a $1.00 reduction in your dues. Each new member will still receive a 50 cents reduction on their dues. The limit of the reduction is $1.00 to current mem­ bers and new members must be in the Open or Senior ranks and must be AMA members. Now if you want to renew your membership for I year for only $5.00 instead of $6.00 just go out and talk two new members into joining! DICK BLACK MEMORIAL I· r i Tfrt INTERNATIONAL POSTAL CONTEST Clubs: Put this on your contest "NicegoirT, you got this mqny minutes!” Calendars!! Date: Any time during Sep­ NFFS MEMBERSHIP AND RENEWAL APPLICATION tember or October One-Day Rule: All flights in any event must be completed (Make checks payable to; National Free Flight Society) between 00:01 AM and I 1:59 PM of the Mail to; FEES same day. Entry Blanks: Make your own, but include your name, address, W. Terre Haute, Ind., 47885 1 yr 2 yrs event, and time for all flights . . . not RESIDENTS OF FOREIGN COUNTRIES S6.00 S11.00 just total. Age 19 AMA Members 6.00 11.00 Send results to: Steve Geraghty, 2858 U.S. and up Non-AMA Members 7.00 13.00 Pinecrest Court, San Jose, Calif. 95121. RESI- Age 15, 16, 17, and 18{Senior) 3.50 6.00 Deadline: Results must be received DENTS Age 14 and under(Junior) 1 5 0 2 5 0 by November 15, 1974. Family membership* 1.00 2.00 Events: FAI Power, FAI Rubber All members receive NFFS Digest. (Wake), FAI A/2 Towline Glider, FAI Family membership fee includes all additional family members, but Address Coupe d'Hiver, Unlimited Gas-Power, no additional copies of the Digest. AMA Hand-Launch Glider, and AMA Ages are as of July 1 of current City, State Zip Unlimited Rubber. year. Please circle applicable fees. Rules: In general, the 1973 AMA New Member □ "Please list family members Rulebook applies, except: FAI events Name Renewal Q are not flown in rounds, and for FAI Address Change Q events there are five official flights and AMA No. flyoffs. Unlimited Gas Power is for any Current expiration date: Month Year kind of gas model, and is to be flown

MAY 1974 41 tqpn'c SEMI-SCALE· B.WARNER POWERED GLIDER I/I6"X 1/8" HARD BALSA(TYP.) FROM: E.A.A. 1931 FLYING AND GLIDER MANUAL RUBBER: ONE LOOP 2 MM PIRELLI OR EQUIVALENT BALLAST LEAD

ro MODEL BUILDER Can you name all of these 1936 Detroit Nationals winners? Such famous names as Goldberg, Korda, and Lanzo are pictured. Bruce and Alvie are there too. See text for more details.

By JOHN POND P U /P $ PAR KS

• Whatcha bin doing this winter? If gained their reputation for pushing and columnist is rather apprehensive over the you haven’t built at least two models fostering the old timer movement on various views he has been publicizing for the Old Timer Championships to be the east coast. Limited to 25 members, about the power problem. Hate to sound held at Lakehurst NAS, then you are the club features such hard workers as like a certain controversial person, but going to miss the doggondest best old Woody Woodman, Joe Beshar, Art let me make one thing perfectly clear; timer contest ever. For that matter, any Thoms; champs like Leon Shulman, the columnist states categorically he contest! Vince Bonema;and dedicated free flight- had no intention of causing any hard Received another beautiful letter ers like Don Garafalow, Ed Franklin, feelings or creating a situation where from Cdr. Jack Bolton, one of the big and Pete Andrews. The prime requisite, no solution is apparent. N AVY supporters responsible for the as outlined by President Dave Jagge, is The writer is there fore greatly pleased actual realization of the SAM Champion­ that to be a member, you gotta be a to read Jack Bolton's follow up letter ships on the east coast. Jack is real “worker.” If you ain’t, you are soon on wherein he states the Old Time Eagles proud to be part of the Old Time the outside looking in. are also concerned over the power Eagles, a most dedicated group of mod­ With a group like this, the club is scramble and have had numerous dis­ elers. quite responsive to all comments, both cussions at their monthly meetings. They The Old Time Eagles have not lightly good and bad. In some respects, the hope to place a rule change at the up-

Tex Newman at Taft Winter Nats with his Norm Carroll, Toronto, and father John, with Vivell 35 powered Bay Ridge Thermal Magnet. Ohlsson 60 powered Buzzard Bombshell. his "Old Ruler" design. It flew!

44 MODEL BUILDER 1920’S POWERED GLIDER By BILL WARNER

• Basically a Northrop primary glider, You can have a ton of fun for fit) Then glue the wing on and add the ship modeled was converted by peanuts with this simple, rugged model some weight to the nose and you have a Orville Hickman of Modern Mechanics with only a few cents and an evening's finished glider! But why stop now? Magazine about 1929 to take advantage building time invested! Bend the prop shaft, rear hook, and of the 3 h.p. Smith Motor Wheel engine. First build the fuselage pinned to a carrier out of .020” music wire. If you This engine, developing its fantastic flat board. While that is drying, cut out have trouble making the carrier from power from only 38 lbs. at 2,600 R.P.M. the wings and formers. If you wet the one length of wire, a strip of thin would not take the machine off the top of the wing a little with your aluminum drilled for the prop shaft will ground, but merely served to extend the tongue, it will make it easier to glue do. The prop is simply two balsa blades glide of the old tried and trusty primary the curved formers underneath. Sand glued at about a 4 5 ° pitch angle to a design. Many modern designers have the slight angle at the wing root to get a 1/16" hardwood dowel or round tooth­ produced sailplanes or "avions-plan- little dihedral, and glue the wings to­ pick center section. The model flies eurs” which use this idea to keep gether. Cut out the stab and rudder and very well with a "left hand” prop made planes up in the absence of thermal, glue them to the finished fuselage, mak­ by accident. ridge, or wave lift. Some even use the ing sure the front of the stab is a little Typing paper was used to cover the engine to gel o ff the ground. lower than the rear, (notch fuselage to rear portion of the fuselage under the stab and to roll a dummy engine and fuel tank. Two bits of scrap balsa hold the engine up so that the 2mm. rubber motor (12” long) can pass right through it. The model was rigged with "fly- tying” silk thread. A motor-noise device can be added by sanding a strip of reed very thin and gluing it to a typing paper “drumhead” covering the prop carrier. Glue a tiny striker on the back of the prop. Note: the reed works best on the side away from the direction of prop rotation. Trim for flight by adding clay until model balances at point shown on plan. Use rudder for turn, elevator to correct stall or dive. The original model flew a consistent 18 seconds under a 15 foot ceiling, and usually flew into treetops when flown outdoors in the street. ·

43 MAY 1974 FULL SIZE PLANS AND STICK 'EM PATTERNS AVAILABLE - SEE PAGE 72 46 MODEL BUILDER ______, ...... power­ Doc Mathews continues to crank out beautiful Monokote covered ed Lackey Zenith. You should see the colors in his "Coat of Joseph!" old timers. This is an American Ace 54. coming SAM Annual meeting to be held at the SAM champs over the 4th of July weekend. Haven’t had this much interest since the writer was SAM Direc­ tor four years ago, and a flock of new regulations were drafted at the 1970 Taft meeting. Better show up if you have something to contribute. Come anyway!! R/C TEXACO EVENT Joe Beshar writes to inform the columnist there will be a Texaco R/C event held if the writer is svilling to sponsor same. Done! Jim Adams has been contacted and asked to get three trophies. These will arrive with the writer. Now, let’s not have any squawks about not having a good duration event! REPEAT ANNOUNCEMENT Seems like a little confusion still ber event for Juniors at the Old Timer Don’t say you didn’t know about it! exists on the 20 second free flight R/C Events at the Lake Charles Nationals. In that same line, let’s recapitulate just Old Timer event being proposed for the “ Big Daddy” is real proud of Steph­ what the Old Timer events are going Memorial Day weekend at Taft, May anie after she won the Coffee Airfoilers to be at Lake Charles: 26 to be exact. This contest will allow meet in Tullahoma, Tenn. Using a simple 1. 30 Second Antique Gas any old timer prior to December 31, design (by B.D., of course!) with a free 2. .020 Replica Gas 1942 to compete. Only 20 seconds o f wheeling prop (plastic, what else?), she 3. Class A Gas motor run will be allowed with ten cleaned up on the Websters, Lee and 4. Class B Gas minute flights as ’’maximum.” Best Brian. Talk about eyes popping when 5. Class C Gas three out of six wins it!! the time of 4:51 came in! Hodja like 6. Rubber Stick O/T JUNIOR EVENT AT THE NATS some 4-1/2 year old kid knock you over 7. Rubber Cabin “Gorgeous Gawge” Perryman writes in Unlimited Rubber?? Kinda boggles 8. Jr. Combined Rubber to indicate the lifeblood of any organi­ the mind! And if we have enough interest, we’ll zation is the amount of upcoming young So get your young one out there this have a Beauty Event. Remember, the talent. Gawge is so enthused over the time at Lake Charles. We are going to model must register at least one official activities o f his granddaughter, Steph­ have an O /T rubber (cabin and stick flight! So, if you can’t make it to Lake- anie, that he is willing to sponsor a rub­ combined) event just for the juniors. hurst for the big Old Timer bash, then

Don Heckman's Buccaneer C Special is powered by K & B 40. R/C Easterners beware! John Pond's hot flying "Raider" with Torp 40 by Heathkit. Don. from New Jersey.built it from an original kit. and Kraft "Brick." "Daddy Warbucks" is heading for Lakehurst!

MAY 1974 45 Beautiful RQ64 custom car by Olle Karlsson of Sweden.. Note big hubs and tires. Olle and car will be here for Internationals. TETHERED RACERS! By TED M ACIAG . . . Our occasional "car-on-a-string" editor pays another visit and tells more about a hobby that is going stronger than ever. Chuck Hallum will be back next month with more on R/C car science.

• First of all a comment . . . Good grief, what happened to the Old Timer events? A little while back there were stories of the graceful old time models being hauled slowly aloft by a Brown or an Ohlsson, chugging away on gaso­ line. The event provided the enjoyment of low pressure fun flying and an appre­ ciation of the problems that the pioneer modelers faced. The .020 events allowed an inexpensive and novel free flight event for those who wanted to build models of the models. But now the models are becoming the same over­ stressed machines of the current free flight classes. How does a Rossi “6 0 ” powered Comet Sailplane bring back the nostalgia of a bygone era? No doubt it was a well built airplane and it took considerable skill to trim, but it hardly evokes memories of the past... unless you look at the last FAI trials as the Another shot of Olle Karlsson's car. Quite a neat package. past. I fully expect to see a Rossi 15 powered Playboy Jr. soon. Finally, if you must radio control an old time plane why not a Guff or one of Chet Lanzo’s radio planes? And just to make it authentic, put a dummy tube type radio inside and hide the modern gear in a corner where it won’t be seen. Letters from people telling me to mind my own business and stick to cars will be filed accordingly. (Speaking for R/C in O T . . . Which do you think would be more relaxing; turning your Old Timer pride and joy loose on the elements, to land in or on whatever it chooses, or flying it with a radio and landing it at your feet? wen)

Speaking o f cars, the Americans are This is Horst Denneler's old record breaking car. He’s from Germany. falling behind the Europeans in the Top speed was 253 km/hr.

48 MODEL BUILDER Nick Sanford, Santa Rosa, with his reliable Anderson Spitfire pow­ The much maligned "F ox" by Joe Beshar, snapped by Leon Shulman ered Scram. Has won a lotta contests. at Lakehurst Naval Air Station. try this one day of old timer flying at the Nationals. It is a real ball! CONTESTS Things are a little dead (except for California) as far as Old Timer Contests go. Have been receiving many photos (thanks!) that make up for the lack of contest news. However, we do have on hand a report of the SCIF-SCAMP ST. PATRICKS DAY BRANNIGAN at Lake Elsinore on March 17. Contest Director Gene Wallock (still has the bum back) reports that in spite of the cool overcast weather, the contest enjoyed 28 entrants. In the rather light lift, two identical models, Sailplanes, - -.VJ ■> ««n··— W .-V - _ ' _ powered with Orwick 64 engines, ran F/F Scale columnist Fernando Ramos' Flying Quaker weighs 3 pounds with Kraft 3 channel gear and Enya 45 engine. No need to say how well it flies. Continued on page 67 The "T-D COUPE” OLD TIMER Model of the Month Designed by: Theodore Dykzeul Redrawn by: Phil Bernhardt In addition to its attractive exterior, the T-D Coupe was well designed struct­ urally, with some features that are con­ sidered quite "contemporary,” such as sheet balsa webs connecting the top and bottom wing spars. As such, it should be a natural for R/C, with almost no mod­ ifications . . . except for splitting the tail surfaces for rudder and elevator control. The original model was flown with a Baby Cyclone engine. ·

Dick Twohy's Bunch Mighty Midget (built from kit) powered T-D Coupe. Dick flew the ship at Rosecrans and Western, in Los Angeles. Beautiful lines of this 1936 design are evident in this pic.

• Not all Old Timer model airplanes years ago!! became famous because of a fantastic In a day when most gas models were competition record, or because the des­ big 8, 9, and 10 foot span boxy clunk­ igner was a well known modeler. A per­ ers, the Coupe stood out because it was fect example of this was the T-D Coupe, small, clean, and very scale-like in app­ designed by Theodore Dykzeul (Anyone earance. As a consequence, among old know where he is today?), and published timers, it remains as well known as the in the October 1936 issue of M.A.N. Miss America, KG, Zipper, Bombshell, Dick and his Coupe, with cowl removed and Stop and think, folks, that’s almost 38 et al. before fuselage stripe was added.

MAY 1974 47 A couple of modified Pea Pods (Model Builder Plan No. 4733) built by Dick Stone and Charles Graf, Severna Park, Maryland. Beam was reduced, cuddy cabin added. Sails are nylon taffeta!

A hearty “welcome back" to our "Strictly Sail" editor. Rod Carr, who will dig into the details of building, finishing, rigging, and sailing by R/C.

• Most skippers are very concerned the changes which will assure your LEACH about a smooth and shiny hull. Most boat speed on the rest of the fleet? TENSION skippers spend hours getting a sheen and Do you make sure that the boat is sparkle to their decks. Most skippers balanced with the amount of weather 5*-15< sand and polish their masts and spars to helm you prefer, and can you change glistening highlights. But when all is that balance at will,even between conse­ said and done, these efforts make a cutive heats, without pulling your boat contribution to the speed of the vessel out of the water? which is minor compared to what could Up until now, the only routes to CHORD have been gained if half die man hours, gaining this kind of background re­ SECTION A-A and one hundredth of the sweat, had quired that you either be a big boat sails and is willing to share his techniques been invested in learning and adjusting sailor, or work your way through the with you. It is our contention that each their powerplant. . . their SAILS. considerable literature written for the fleet needs a sailmaker; maybe not in Simple minded calculations show that prototype sizes and cull from it those the business per se, but a skipper who a typical sail plan of the size of an East things which would be o f significance to understands sail set and trim, who is Coast 12 or Santa Barbara produces the model yachtsman. Well, our sport familiar with local conditions, and who power at about the same rate as a hot has grown in the past couple of years, can make small adjustments to commer­ .020 glo-plug engine in normal winds. and we have reached a point where this cially produced sails to make them per­ With so little thrust to push a 26 kind o f information is easily available. form well in the conditions under which pound vessel in the displacement mode, Who has it? Your friendly sailmaker. you sail. doesn’t it make sense to maximize the At the present time, model yachts­ These lofts are: BLACK’S BOAT drive that your sail plan produces? As men are lucky to have three working ACCESSORIES, 4761 Niagra Ave., San wind velocity goes up, do you make the lofts directly concerned with model Diego, Calif. 92107. BUILDERS LOFT necessary adjustments to your sails to yacht sails for all classes. For answers to 304 E. 23rd. St., Chester, Pa. 19013. allow increased drive to push the boat, your specific questions may we suggest CARR SAILS, 7607 Gresham St., rather than merely absorb increased heel that you contact these lofts, and fur­ Springfield, Va. 22151. and drag? When you are faced with a ther, that you keep a sharp eye out to In the following columns, we hope to race course which turns out to be pre­ see if you can’t identify one fellow in provide you with basic information dominately reaching legs, do you make your local fleet who has good looking about your sails. We’ll be guided a great

50 MODEL BUILDER I F. Bund, Hannover, Germany. Harald Arlutzki, Germany, with OPS powered Phil McDonald is happy with his winning All German photos courtesy of Phil McDonald. and enclosed wheel streamliner. Arrow car. development of new engines and cars. real engineering goes into their designs. tually inside the pan and covered by the At the present time, all of the tethered A lot of them use a front suspension to body. While I don’t believe that better car records, except for the American smooth out the rough tracks that they streamlining helps much, the greater Manufactured classes, are held by Euro­ have. A stiffly sprung front axle should rigidity of the short axle coupled with pean designed and built cars and en­ be a help on all but the best of tracks. the lesser side loads makes for a more gines. For years, they have held the Rather than mounting the magneto on efficient drive train. A long axle gives records in the smaller classes because tiie engine, they mount it on the gear more moment arm for the forces that of a total lack of interest in the US, but box. This is better, because the less disturb the free running of the axle now they are beating us at our own strain put on the front plate and crank­ bearings. Since friction is the greatest game in the 10cc or "6 0 ” cl ass. They do shaft, the more freely it can run. Small enemy of speed, anything to reduce it is have the advantage of a slightly smaller refinements like these can add up when a help. Another advantage is that with a track which gives less cable drag (be­ you are going for a record. The large live axle there is a slipping o f the out­ cause there is less cable), but to my rear wheels and solid tires may or may side tire because it has further to go on a way o f thinking, that isn’t sufficient not be better, but they do hold up circular track. Pontiac’s theory of a excuse. The Italian made OPS is finding better than the currently made Ameri­ wide track doesn’t apply when the car its way more often into the winners can tires. The overall car is lighter, but doesn’t have to take a corner on it’s circle at American races. Surely the with the front suspension they still track own. Americans can come up with better well and have enough traction to get the All of the above factors are small but racing engines in spite of the high cost horsepower to the ground. when taken together could explain why of doing business over here. The latest record holding cars are we are falling behind. O f course, nothing The European cars in the 10cc class powered by the OPS and are showing beats more horsepower, and the Italian look much like ours, but have some even more novel design. They have a OPS engines have more horsepower than subtle differences which show that some very narrow tread, with the wheels ac­ Continued on page 63

Bill Dyer works on his ST 29 powered car at last years Nationals. Ira Hassad visited the Nats and carried around one of his famous engines. Made everyone drool, but it wasn't for sale!

MAY 1974 49 one should make some sort of record of positions of the outhaul and halyard in y °ur D o w * T y order to obtain a reproducible set for any wind condition. ------i m m * u ** 4/6 + All the foregoing talk is of little avail if you don’t go out and sail tuning trials against another boat, changing one thing at a time until your boat is faster whether you sail it, or the other skipper sails it. Then let him make changes on his boat using you as the benchmark. You’ll learn more in a concentrated afternoon (if you keep records), than a whole season of panic adjustments made in the middle of regattas. Send your questions to: Rod Carr, 7607 Gresham St., Springfield, Virginia 22151, or care of Model Builder. Re­ member to send your $5.00 annual dues to the AM ERICAN MODEL YACHT­ ING ASSOCIATION, 4761 Niagra Ave., With K&B S E B V ^ San Diego, Calif. 92107. · C/L ...... Continued from page 28 When you purchase a K&B engine gine seems to start easily and run Expertly you not only buy the finest engine smoothly, with good speed, and most Trained in the field, but you are assured importantly, enough laps to one-stop Technicians also that the manufacturer stands the usual two or three-stop race. This looks very interesting and I will have to behind the product with the best find out more about this development. offers and most rapid service available Guaranteed The small amount of combat that I Repairs ...fo r minimum “Down Time.’’ had time to watch failed to show any new techniques in evidence. There were ALL PARTS, FOR ALL K&B some new wing tip shapes and fancy offers AND VECO ENGINES IN STOCK. names but no new designs. We’re wise Genuine to your tricks, fellas. Far too many NO DELAYS! K&B Parts matches were won on time, and not cuts or kills. Most often, this was due to unpracticed pit work and not a lack of ^ Couit60US and Sincen*$e piloting skills. Go watch some of the better racers for awhile and then form combat teams of three or four people, and practice equal time for pitting and flying, you’ll win more! The only thing lacking was stunt. I chewed you guys out last time. Get out and be seen! We need you fellas on the ε field . . . I think! I recently attended the Cancer So­ ciety benefit model airplane show held at the old Mile Square flying site in Orange County, Calif. We have to refer division of aurora hobbycrafts to the “old” Square because the model 12152 WOODRUFF AVENUE · DOWNEY, CALIFORNIA 90241 flyers were banned from there last year jib shape is the leach tension. This is Loosening the strap at its termination due to the efforts of one very effective brought about by a downward force on the swivel fitting allows infinite ad­ real estate developer who fell the model exerted by the jib club on the clew justment. What you wish to attain is a flying was hampering the sales potential of the area. The Marines have a policy arising from the tension in the jibstay. parallelism between jib leach and main The jib swivel is the secret to proper leach. This conformation is sought to of not becoming involved in civilian leach tension. The closer the jib swivel allow air to freely pass between the jib disputes on Marine property, they just is to the forward end of the jib club, and main without “choking" or "back- order everyone o ff and lock the gates. the lighter the tension on the leach. winding” the main . . . or without stall­ This made the developer happy. How­ With larger jibs appearing on formula ing or luffing the jib. ever, because the Cancer Society has class boats such as Littlejohn’s BOOM­ The final control of jib shape is the more pull than real estaters, the model­ ERANG, it is imperative that leach foot outhaul. Naturally the more foot ers were allowed back for one weekend tension be under fine, positive control. tension, the flatter the foot. Shape and and put on a really big show for This requires that you make some sort flow is important in the jib foot, since hundreds o f spectators from the sur­ of arrangement for moving the jib swivel one obtains lots of. drive from this part rounding communities. fore and aft on the club. The simplest o f the sail, and very little damaging heel. While at the show I learned of arrangement is to make a brass strap Jibs with flat feet should be avoided. another group that had lost its flying that wraps around the club, and clamps There is a definite interplay between field. The Norwalk Skyburners had simi­ down (on a circular cross section club). foot and luff tension. They interact, and lar problems six months ago and had to

52 MODEL BUILDER deal if we can address our remarks to specific problems you might have, and therefore solicit your questions. Let’s start at the beginning. Ap­ proaching the boat, bow on, the first HOBBYPOXY beauty is sail we encounter is the jib. Now, re­ membering that there are as many ways to set a sail as there are ways to skin more than skin deep! the proverbial cat, the jib sits on a jib- stay. The jibstay connects the forward end of the jib club and a point on the mast. It’s recommended that the jibstay terminate in a loop below the mast attachment point, then a double nylon squidding line arrangement be used in conjunction with a tang and cleat to allow changing the length of the jib stay as required for mast rake considera­ tions. (Fig. 1) A convenient mast attachment meth­ od is a tang with a sail corner grommet installed in the lower hole to prevent cutting o f the squidding line. The squid- AI Rabe, national control line aerobatics champion in 1972 and 1973, ding line is held in a cleat under the chose Hobbypoxy enamels because he wanted a shiny, durable, fuel- tang mounted to the mast, passes up proof finish... which he got. But when he crashed his Sea Fury prior to through the tang, through the loop in the '72 Nats, he discovered another advantage of Hobbypoxy paints; the jibstay, back through the tang and repairability. Here's how he tells it: “The crash destroyed the nose back to the leading edge of the wing. I down to the cleat. Leave the cleat built an entirely new nose, grafted it onto the fuselage, then covered the loose so that the first turn around it bare wood with .001" fiberglass cloth, using Formula II glue. Next, rather with the squidding line jams well. You than my usual talc-dope filler, I decided to use Hobbypoxy enamel, in the can’t really depend on half hitches as proper color, as a filler as well as a top coat. The reason for this decision you can with big boat lines, and we’re is that Hobbypoxy enamels fill fast and sand beautifully! And, in finally fed up with round bowsers as a addition, because there’s no shrinkage there is no settling of the finish means of adjusting such rigging. You weeks later, as occurs with dope. now have a system which will allow the “I brushed on four or five coats of color, wet sanded down to the cloth, rake o f the mast to be adjusted for fine then applied three more brush coats. After a final sanding I sprayed the last coat with an airbrush. When finished the damage was undetectable, tuning, yet allow a taut jibstay. We and the total repair added no weight! Let’s see somebody try a similar oppose use of headstays since they re­ repair using any other product, epoxy or dope. I know It won’t be as good move load from the jibstay, letting it sag. because I’ve tried them. The shape the jib takes is partially “Later, because of the success of the repair, and some design changes cut into it by your sailmaker when he I wanted to make, I rebuilt and completely refinished the model. Again, adds “lu ff round" to the sail at the sandability of Hobbypoxy was the key factor in my decision to rebuild the airplane. luff. Unless you can provide him with a “As faras I'm concerned, until some other product comes along that's table of offsets showing how much your superior...and it hasn't y e t...I’m going to continue using Hobbypoxy jibstay sags while sailing, he must trust exclusively.” you to carry as much tension in the You should too. Especially if you crunch one now and then. For full jibstay as you can (with proper care information on painting... and repairing... send for our free “Hobbypoxy given to its effect on mast shape) so Painting Pointers" booklet. that the stay will be as straight as possible. Then the sailmaker can cut a A Division of Pettit Paint Co., Inc. fairly standard luff round to help correct HOBBYPOXY PRODUCTS 36 Pine Street, Rockaway, N.J. 07866 for the typical jibstay sag observed. We generally use something on the order of 0.1 inch per foot of jibstay length. (For your own benefit, take a roll of black head o f the jib, and serves to tension and you’ll be able to see the draft. The and white pictures o f your boat under the sailcloth along the luff. We gener­ point of maximum draft should be be­ sail and when you get the prints, hold a ally immobilize the tack of the jib with tween 30 and 50 percent o f the chord straightedge up to the jibstay. If you can a loop o f rigging wire around the bow aft of the lu ff and is controlled by luff take a picture from dead on the beam, end of the jib club, and make all luff tension. The amount of draft will vary using the length of the jibstay as a tension adjustments with the jib hal­ between 5 and 15 percent of the chord, scale, you can indeed find out how yard. The tension from the halyard and is controlled by sail cut, and to a much your jibstay is sagging.) Every­ distorts the sailcloth, and will pull the degree, foot tension and leach tension. body we talk to gets a double dose of draft (extra cloth in the center of the Keep a notebook, write down the infor­ "Keep your jibstay tight!!!” A square sail) forward as tension is increased. Pull mation, keep track of the wind veloci­ foot of jib will generally give you the too hard and you’ll find a crease just ties you sail in. Soon you’ll have a good power that it takes two square feet of behind the jibstay. idea o f just what kind of tensions to main to provide, so everything you do Lay your boat on its side with the put into your sail after having a reading to insure a strong pulling jib will pay sheets pulling the jib club to the close of the wind and looking in your log. off doubly. hauled position. Hold a straightedge Sails that are set by guess and by golly Running parallel to the jib stay is the across the sail as in section A-A in will never consistently win anything. jib halyard. This line is attached to the Figure 2. Gravity will pull the sail down The next most important control on

MAY 1974 51 ON THE SEA W O O D SHIP MODEL KITS with carved hulls, metal castings & doth sails

H.M.S. BOUNTY Kit G4 Length lO '/ z " Authentic Replica Series Every kit contains a machine carved hull, genuine metal castings of Cannon. Life Boats, Anchors, Steering Wheel, Stern Castles, Figurehead, and many other castings as needed. Also Chain. Black and Tan Rigging Line, Printed Cloth Sails, Decals, Display Pedestals, and all the rest that go to make an easy to build full rigged sailing ship that will gain in intrinsic value as years go by. Models truly worthy of a place in your home or GOLDEN HINl any museum. Kit G5 Length 9%"

Re live history as you walk the deck with Captain Bleigh and Mr. Christian on the Bounty, Sweep the seas of the Spanish Armada with Sir Francis Drake’s Golden Hind, Join the infamous pirates as they attack Merchant Shipping and exact ransom with their swift and deadly vessels. All this in amazingly easy to build kits that feature new simplified rigging and modeling techniques. Unusually complete kits include easy to AH read and detailed step-by-step plans Ju s t and instructions. $6.95 ea.

vacate the Norwalk Park. The Sky- up to fly on Sunday mornings. Anyone fly your models, the result will be the burners were more fortunate than most living in or near the Long Beach, Nor­ best running, longest lasting engine you because they were able to work out walk, or Orange County area had better ever had . . . regardless of brand. an agreement with the ABC School move their body on over to the inter­ Here is the procedure to follow: First District for the unrestricted use of the section of the 91 and 605 Freeways and remove the engine and tank from the Gahr High School on Sundays. They get in on the fun with the Skyburners. model. Fill a large jar with lacquer thin­ have their agreement in writing with EASIER STARTING ENGINES? ner (the cheap stuff from Standard the school district. Sanitation facilities How many times have you gone out Brands paint stores). Wash o ff the tank are provided, and the local police have to fly and ended up saying bad things, and flush the inside with your squeeze agreed to patrol regularly on Sunday to because your engine was hard to start bulb (it will now last longer also). Dry assure that the flyers are not disturbed. or ran erratically? If it worked fine last the tank o ff and reinstall it. You did It sure would be super if all the clubs week and you just wiped it o ff and hung remember to clean the filter didn’t you? in the country were as fortunate. it up, it might not run so good this Now for the engine. Remove the The Skyburners field is really BIG, week. The problem is the fuel residue prop, glow plug, needle valve . . . yes, with enough room for as many as ten and the grass and grit from the flying that’s right, the needle valve. There is circles. Wow! Their club is really big site. If you perform a simple 15 minute nothing sacred about a setting, especial­ also, with forty plus people showing cleaning operation E V E R Y TIM E you ly if there is old gummy fuel inside.

54 MODEL BUILDER SAUFISH

One of the prettiest Sailboats you ever saw either Free Sailing, or R/C. Construction is simplicity itself. Die Cut Frame, A features Plywood for strength and long Æ life. Printed-planked Deck is Die Cut Æ MODELS 6 and ready to slip into rub rail, molded Æ INC. into Sleek Plastic Hull. Kit is Λ PHIIA . PA. 19144. USA unusually complete with Die Cut M Mahogany Cabin, Brass Chain, Λ Many Cast Metal Fittings, Λ CLOTH SAILS. Rigging cordage, Λ Mast & Boom Material stamped Λ Rudder and Keel with Λ INTEGRAL LEAD BALLAST, J Step by Step Plans show Λ simple assembly. Base m shown riot included. Λ

HEIGHT 32 Vz L E N G T H 2 4 " B E A M 5 "

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MAY 1974 53 record almost unattainably high, that MVVS 2.5CC D7 is produced in was set by a real specialist on one o f Czechoslovakia. This is a good engine, JACK STAFFORD those rare perfect condition days . . . placing 5, 6, 7 behind the American same place. A.R.M. and the Russian hand-built en­ MODELS IN A RUT? gines at the ‘72 World Champs. As it Super Minnow Wins We all are in a rut one way or comes, a considerable amount of clean­ 4th NATS in a Row! another, and I'm trying to point out ing and fitting is necessary before it some of these gray zones in an attempt can be run competitively. It is loop 12111 Beatrice · Culver City, CA 90230 to improve our sport for everybody, not scavenged with rear exhaust and has just the organizers. Be patient, I will front shaft valve induction. MVVS is eventually chop your own favorite working on a Schnuerle design, but event. Maybe even F.A.I.! when it will be available is not known. AND NOW FOR YOUR FIRST Stanton Hobby imports these engines LESSON IN F.A.I. TEAM RACE. and they sell for about $30.00. One unfortunate factor of F.A.I. is There you are. Go get a diesel. Next the limited amount o f equipment avail­ month you will find out about diesel 50" Span Formula 1 able. Nearly every race flyer must hand fuel and its many variations. See you Winner 69, 70, 71 & 72 NATS make most of his own equipment. Fur­ then . . . · Super Minnow______thermore, most of the equipment that Mooney .... Continued from page 35 is manufactured is difficult to obtain. Most hobby shops do not stock these sists of a single loop of one eighth brown items due to the low sales volume. It is Sig contest rubber seventeen inches therefore necessary to mail order the long. It was lubed with Sig rubber equipment you desire. This is time con­ lube, rather sparingly, to keep from « 4 ·· S P A N Messenger FULLY suming, but usually worth the effort. slopping up the inside of the fuselage. A The Team Race diesel engine is the new Peck-Polymers 4-3/4 inch plastic first item of equipment that must be propeller was used, and the spinner was obtained (and the most important). made of five-minute Sig epoxy. In this There are at least nine engines made configuration, the model balanced at that are suitable for racing. Not ail of the CG indicated and flew without any 5S” SPAN 40-60 ENGINE them are available to the general public, adjustments. The motor would take Chipmunk ______F O A M W IN G unfortunately. Four o f the nine are 1800 winder-wound turns. fairly easy to acquire and not terribly The 53 second flight was the third expensive. All four are easily capable ever, and was hand launched. Various of turning times in the five minute other minor adjustments were tried after bracket, and with careful tuning, will that, but none of them improved the 72” Span 56-65 Engine run in the high fours. (But that takes flight time. The model would consis­ Comanche—A ll Balsa C ow l_ work!) tently exceed 45 seconds from an ETA ELITE is produced in England R.O.G. (We claimed that all flights by Ken Bedford and can be obtained should R.O.G. at the contest, but Peanut only from the factory. This engine, in rules say H.L. is okay, and the owners various refinements, has been produced of several long-propellered birds, who for many years, and has powered several wanted H.L., prevailed). No thrust line Aircoupe 63 sScalV tb a i^ ' ne World Champs winning models and is adjustments were required, and the still a competitive choice. The latest model shown automatically flew in right version incorporates piston ports to im­ hand circles. Since small surface warps prove fuel flow. Price is about $40.00. can affect the flight, I couldn't guaran­ ETA Instruments, Ltd., 289 High St., tee that all models will fly to the right, Watford, Herts, England. but I can say that this model flys fine KOSMIC K/15D is produced in Mi­ in that direction. lano, Italy. This engine is, externally, The construction of the Sparrow- nearly identical to the Supertiger rear hawk follows the standard, time proven valve and will fit into a model built for format. The fuselage is a stick balsa the Tiger. The motor is extremely well basic box, with semi-circular formers made, with machining o f the finest added to the top, which are then cover­ quality. It is a Schnuerle port design ed with thin sheet balsa. Because of the with rear exhaust and rear disc valve high thrust line, there are cutouts in the induction. For those who like to exper­ formers and no permanent cross sticks iment, a diesel conversion can be set up between the upper longerons. You may on a glow case by switching appro­ find a few temporary cross sticks an aid priate parts. The glow is different in­ during assembly. The top part of the ternally from the diesel. engine cowl between Stations 1 and 2 is Trainer Stanton Hobby sells the Kosmic for carved from block balsa and hollowed to about $30.00. 4734 North Milwaukee provide motor clearance. The nose block Ave., Chicago, III. 60630. is carved from a balsa block also. A SUPERTIGER G15RV. These en­ piece of one eighth thick sheet balsa, gines have been favorites for years and cut to fit snugly in the front of the 3B bpan 15 En are good competitive choices. They are fuselage, is cemented to the back face of Mustang QM Quarter loop scavanged, with rear disc induc­ the nose block so that the front end can tion. World Engines imports them, and be removed. This allows easy installation Send stamp for new c they are available at many regular hobby of the motor, and also stretching of the shops. The price is about $30.00. motor for winding. The wing saddle 56 MODEL BUILDER IN THE AIR ALL BALSA MODEL. PLANE KITS Ready to Assemble

BeGiNNeRs FUN SeRies If you really want to have some fun, then go out and get one or more of these nifty control line models. They’re the easiest ones in the world to assemble— all wood, no tissue covering— only 6 to 9 parts, depending on the model (except the Fokker which has a few more, because of the struts). Genuine Nylon motor mount ready to bolt in place—Complete control system (less handle and lines) decals, landing gear, wheels etc.; which makes BEGINNERS HELLCAT F6F building a cinch and assembly literally Kit S42 Span 20V4" $3.95 in minutes.

You can use most any .049 engine made (even from an abandoned plastic model, tho it may need some modification). They are just perfect to learn to fly on (First time flight instructions on plans). Everyone of them flies just great— and you can't hardly hurt them— because they're light and rugged. We’ve got 13 in the line now— priced so low, you'll want to build a fleet. Wing Span’s are all about 21" and the tools you'll need are usually found around the house— So get over to your dealer and take a look— they're the most. . . for your BEGINNERS FOCKE WULF— 190 fun .. . for your dough! Kit S43 Span 20>/j” $3.95

SEEDLING MODELS · DELEIELO AVE do'i occoo'od— »ilk <0% oddilionol (kotgt for handling and shipping 160< minimum in U S . S· .25 minimum outside U S ) □ Cotolog of oniir# lino of airplon# control lino model kit«. R/C icolo ond Tremor kit«, boat modal kilt, accessories; ate. J5c enclosed Π Sacral« of Modal Airplona building Including deign. construction. co*armg, finishing, flying, adjusting, control systems, etc ?Sc enclosed Q Secrets of Control line ond Carrier Flying " Including preflight. soloing, stunting. Corner ryias ond rogulotions. Carrier flymg hints and control line installation instructions ?5c enclosed No checks. Only U S money orders or currency accepted

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Also remove the back plate. Before you doesn’t there is still some grit inside, so mance. Construction is very simple, go any further, that thinner must be fil­ REPEAT the filtering and rinsing. Be­ using sheet wood . . . and any team tered. We do not want to put dirt into fore closing up the engine it must be racing engine can be fitted without any the engine. Use a clean paper towel as a thoroughly oiled . . . don’t use 3 in one problems whatsoever. filter, it works just fine. oil, that’s 20 weight motor oil and not SPEED FLYERS - GET ORGANIZED i Submerge the engine in the thinner suitable for two stroke engines. WD-40 Invite the outside world into your and start spinning the shaft. Be careful or LPS are good preservatives and easy domain and promote your very inter­ not to let the rod slip out on the end of to use in the spray cans. Close up the esting side of the hobby. Advertise and the shaft and bind up. About one engine and reinstall it in your model. start some regular meets o f your own minute of this flushing and the parts You will now be blessed with easy start­ instead of shirt tailing the other clubs. should spin freely . . . very freely. If you ing and smooth running. This ritual How about an old timer contest? want to be very thorough, filter the should be performed after each flying You know, where every one fly’s the thinner once more and give a final session for trouble free operation. same event to see who is the fastest on ri nse. PLAN OF THE MONTH that particular day. Kind o f like the Dry the engine completely. Lacquer The McCollum - Hodgkins FAI racer race flyers do it. I know speed flyers thinner evaporates very quickly. Your detailed this month is an excellent who do not like percent-of-record con­ engine should still spin FREELY. If it model designed for maximum perfor­ tests because their favorite class has a

MAY 1974 55 I have no criticism of the kit whatso­ Pit/you know R/C Sailing can be highly competitive,or just ever . . . the materials are first quality plain fun? through and through. One change or addition I would make is to reinforce P ie /y O U know Your present R/C equipment can be used the area where the rubber bands come without change? in contact with the wing. This is where the wing comes in contact with the FOR THE AM YA 5 0 /8 0 0 CLASS fuselage cabanes. FOR THE AM YA 3 6 /6 0 0 CLASS INTRODUCING! With the model completely assem­ bled, I checked the C.G. and it seemed TAHOE GOO to be O.K. I gave the model a gentle toss η ι κ η / ε and it flew like a sailplane! I could Length 36 in mown) Length 5 0 in hardly wait to test fly it. The testing Beam 9 \ in Beam 11 ^ in Sail area 6 0 0 sq in was made at Lake Elsinore where there Height 74 V i n is plenty of open space for a model like . MOLDED PLASTIC CONSTRUCTION Sail area 800sq in this. ■ FINISHED NYLON SAILS Displ. 14 \ lbs (lessR/C) ■ COMPLETE KIT (LESS BALLAST) I use a lOcc syringe to measure the • MOLDED PLASTIC CONSTRUCTION fuel for my .020 engines. What I don’t • FINISHED OACRON SAILS f 3S 's„. •COMPLETE KIT (LESS BALLAST) need is a 5 minute engine run! With 3cc of fuel, I fired up the little Cox VICTOR SAIL SYSTEM engine. The model was given a light FOR MODELS WITH UP TO 600 «) in toss into the wind. The Starduster SAIL AREA $ 2 4 « COLORED NYLON SAIL SETS AND climbed steadily in a left hand circle. LEAD SHOT BALLAST AVAILABLE VICTOR M K H SAIL SYSTEM When the engine quit, it settled into a FOR VALKYRIE SIZE MODELS (AVAILABLE APPROX M AY IS) Dealers welcome gentle right hand pattern. From then At yogi dealer or on it was one great flight after another. direct from: VICTOR MODEL PRODUCTS g t '90242 I use a 6/3 prop so that the climb and flight is more scale-like. Otherwise, the you don’t have to idle . . . just imagine and not one time was there anyone in­ model would have to have a D.T. or it how hard it would be if there were an jured, or even a close call. By these would fly away for sure. idle requirement! Secondly, all the man­ figures you can surely see that this I would recommend Tern’s Stardust­ ufacturers have designed the engines so event is not nearly as dangerous as er for a sport F/F model. It would also that they will not idle, and any attempt some people try to make it seem. make an excellent R/C model using one would be absurd. Third, Formula I is That’s enough rambling on for this of Ace’s R/C units. I ’m looking forward certainly not an event that everyone issue. Let's all mix up some 5 minute to the day that Tem comes out with should enter. For those who want to go epoxy real quick, finish that highly its first F/F gas scale kit. When they do, slower, there is Quickie 500 racing, prized 5 lb. beauty, and go racing! it will be a beaut. Toad racing, Quarter Midget and cer­ FLASH How about an 1/8 scale SE-5 Kite? tainly many other events that are run on For those real hearty racers, I have No, this isn’t a profile model, or a a slower pace for the flyer who desires good news. Las Vegas is going to put on conventional kite with an SE-5 painted this style. I definitely feel that Formula another Formula I race this season. on it. This is an honest to goodness I should be left alone; that no changes September 21, 22, those are the hot molded foam model o f an SE-5. When or restrictions as far as speed should days. Not everything is finalized yet, but I first opened the box, I couldn’t be­ be imposed. you can expect a real good contest for lieve what I saw. It was huge, and the From the safety point of view, I certain. I hope you fellas back east can parts were already made and painted! submit that if a race is run using the get out there and join in the fun. Just All I had to do was to quickly read the course designed by the AMA, and in think, race all day, gamble and party all directions and put it together. The en­ particular the distances from the race night. Fun for all. Bring your wives or tire job took about 15 minutes. This course to the spectator area, that Form­ girl friends, or even both (for the kite is complete with painted and ula I is much safer for everyone as com­ daring). Hope to see all o f you there. “scarfed” pilot, Lewis machine guns, pared to any pattern contest where no “I said turn LEFT, dummy!" · and twin exhaust. Even the landing gear limitations are imposed and in many is scale-like in operation. The scimitar F/F Scale .... Continued from page 31 instances the planes actually fly over prop is hand-carved, and free-wheels in the spectators area and the flyers in the There are several different ways to flight. Beside the airplane, there are two ready box. make the landing gear, so I chose the handles with 250 feet of monofilament I am sure that if more time were one I liked best. It is amazing how all of line, and swivels. One handle looks like spent trying to make things safer and the parts for the fuselage, in particular, a regular Nordic type reel. All these are less time was spent on how to change a were fitted into one large interlocking hand-made and painted. I couldn’t be­ very exciting and highly competitive unit. Every part did fit. Construction lieve it. event, that we will be much better off. time took about one week of part-time After reading the instruction book­ In Southern California for example, the building. The finishing was done in let on how to fly the model, a test had interest has actually climbed by a start­ yellow and blue Japanese tissue, fol­ to be made. The only criteria, in con­ ling 21% over the past year, and here is lowed by several coats o f nitrate dope. trast to flying any F/F scale model; where safety is highly stressed. From The sheeted portion of the fuselage was there has to be at least a 15 mph wind. the records that I have kept, in 1973 given a couple of coats of K&B epoxy There is an eyelet on the bottom of there were less airplanes lost than in primer. The entire model was given a each lower wing where a line from each 1972 by a whopping 27%. I am sure light coat o f K&B Satin Clear epoxy. handle is attached. The idea is to form this is attributable to the safety inspec­ This seems to be the best way to fuel- an inverted ‘V with the airplane, or tion of all planes that are entered in a proof a model. I used No. 4 Trexler kite, at the apex. The handle without contest. There were 8 contests, 64 wheels. The motor mount is made re­ the reel can either be held by someone rounds, 384 heats, and 1534 plane movable for quick service to the en­ or buried in the ground. The handle heats flown all in Southern California, gine, if required. with the reel is held by the “pilot."

58 MODEL BUILDER part of the lower longerons is cut from 1/16 sheet to match the shape of slope&thermal soaring sailplane the top of the center section ribs. The wing structure is conventional; using a leading edge, a trailing edge, ribs, and two upper surface spars. Wing tips The Hi-Performance Compact" are cut from sheet balsa. The ribs over FEATURES the landing gear should be cut from contour-sanded wing ribs SPECIFICATIONS rather firm balsa sheet, because the wing \p

MAY 1974 57 success obtained their successes by means of models, and up to a certain time, all the knowledge of the dynamical laws governing the principles of flight was obtained from the making and flying of miniature machines, or parts of them. “ Up to the time when the Brothers Makers Wright flew in America, and Santos Dumont in France in 1906, no machines of had travelled through the air under their own power, but a few models at scatter­ ed intervals spread over the last six decades of the nineteenth century.” Twining goes on to point out: “Be­ tween the years 1890 and 1895 that worthy man Laurence Hargrave, of New South Wales, spent much time in experi­ menting with kites and aeroplanes. It the SANTA BARBARA ONE DESIGN was he who produced the box kite, and with model aeroplanes did at that still early date what few of us present- day modellers can boast of having done, and SOLING-M r/c racing yachts. that is, he built models in which he employed three different kinds o f mo­ tors and three different sources of power, not, of course, all on the same machine. Not only did he do that but 210 EAST ORTEGA STREET he applied his power in two different ways to obtain propulsion. His motors SANTA BARBARA, CALIFORNIA 93101 were skeins of twisted rubber, compress­ ed air, and steam, and he applied these motive powers to drive screw-propellers in some machines and flapping wings in others. Some of his models were fairly large and the workmanship was excel­ lent. In his steam models he always used collective heads, need them or not. it really makes me drool, it’s so clean flash boilers, made of coils of copper One of the sexiest little machines looking and functional. Leave it to the tubing, the engines being of the single seen at Toledo was not at the exhibit old “master” to come up with a beauty cylinder reciprocating type, with ordin­ hall. What I'm talking about was Kavan’s like that!! And there’s no doubt about ary slide valves. The average length of prototype “Alouette,” shown solely in the flyability and reliability of any the flights was between two hundred that gentleman’s hotel room. (And also Schluter chopper! · and three hundred feet.” at an exclusive press dinner on Friday PARTING SHOT Hannan...... Continued from page 34 evening, wen) This little machine is quite We just couldn't resist swiping this small, light, and simple. The rotor head Clarence Mather continues to win meets from the National Free Flight Society is a non-collective type one and the with his Russian Stormovik that must Digest (Bob Meuser, Editor): copter is powered by a .19 size engine. certainly be over seven years old (it has F/F’er: Do you know your wing is I believe the kits are expected to be been re-covered), offering proof that on backwards? available late this summer, and the price with care and proper maintenance, a R/C’er: Never heard o f it, but if should be less than $200. This is a model should be good for several sea­ you’ll hum a few bars, maybe I smart looking little ship and I look sons of flying. And, there is nothing can pick it up. · forward to seeing one fly. more confidence-inspiring than a proven, I could continue further on about dependable performer when the chips KAOS ...... Continued from page 23 Toledo, but the high spots have probab­ are down in a contest. Think about this wheel and the retract servo. Thus, the ly been covered. So enough! And before before abandoning your next slightly- nose wheel is retracted or extended first old (Hey, watch it!) Bill Northrop cuts damaged aircraft. before the mains come up or down. The off my scribbles, I close voluntarilly. AND SPEAKING OF AGE system has worked well so far. How­ Thanks much, Nate, for the nice We recently examined a copy of the ever, it requires a bit of "fiddling” to coverage . . . we’ll look forward to other AERONAUTICS magazine for June, position the Goldberg threaded micro contributions in the future. 1912. Although devoted primarily to switch actuating discs properly so that Just before “ touching down" for full-size aircraft, this periodical featured the nose wheel locks both up and down this issue, I want to thank those of you a regular column devoted to “model while simultaneously triggering the mi­ who took the time to fill out and mail aeroplanes,” written by one o f the cro-switch. The new Goldberg servo has in the data card. Your efforts will be more accomplished builders o f the time, plenty of power and it was installed as appreciated by many beginners in the E.W. Twining. recommended in the instructions. In­ hobby. We'll reprint the form from time We’d like to quote a few brief pass­ cidentally, the gear has been cycled to time so you can still get your name ages: "The history of the model aero­ many times, both on the ground and in “ in the pot.” plane may be said to be the history of the air and is still operating on the same And don’t fail to watch for that new the most practical attempts to solve pair of inexpensive pen cell batteries Dieter Schluter "Gazelle" helicopter kit the problem of flight by machines originally installed. with a very simple collective pitch (Ex­ heavier than air, for the early experi­ The “Super Kaos" was finished with pert) control. I ’ve seen the pictures and menters who attained any degree of Francis Resin and sprayed with Hobby-

60 MODEL BUILDER BOAT & HELICOPTER STARTER with Aluminum Dual Drive Pulley, offers choice of starting speeds.

See it at you/i^Dea^e/is cAiou/I oft QA^ftite di/ieet {oft C a ta lo g Sheet.

baN Í01Ř BN jn5= INC. 2 South SYLVAN IA AVE. PH I LA.,PENNA. 19 I I I

The wind must come directly at the This super simple model was built from back door to watch a flying demonstra­ kite. With someone holding the kite extruded aluminum square tubing which tion of the two Jet Rangers complete aloft, the pilot can either run or reel was pop riveted together! A K & B .19 with latest modifications. Ernie inci­ in some line until the kite is airborne. engine drove the Schluter type rotor dentally, is our U.S. National champ and During flight the pilot can walk for­ through a timing belt and nylon gear. Mike is the German National champ. At ward or back keeping the kite tracking John later demonstrated the fine flying any rate, these two gentlemen demon­ straight into the wind. This is really a qualities of the four (I repeat 4, strated that the latest Jet Ranger rotor fun model. It is also a sneaky way of F-O-U-R) pound machine. It is an ideal head is one of the best, if not the best, getting your kids interested in airplanes! basic trainer and John is already build­ available today. And the mod can be For further information on this most ing a small number of kits for direct easily incorporated into the existing unusual scale kite write to: J.C. Butler, sale at $250. head. P.O. Box 123, Weatherford, Texas As I fought my way through the The flying demonstrations, this year 76086. crowds into the commercial display dominated by helicopters, were kept Next month we’ll have a review on area, I was joined by Horace Hagan. As very short. Cold temperatures and blus­ the Flyline Bellanca Skyrocket. · in the past, Horace helped bridge my tery winds sent spectators, scurrying German-English language gap. We stop­ back into the exhibit hall. It got so cold Choppers...... Continued from page 19 ped to meet Dieter Schluter and his during one flying session that my Pentax over 20 years, RC enthusiasts have lovely wife Heidi at the Micro-Craft camera shutter refused to work. During attended that trade show to see the display. Dieter was showing his eye- camera-warming in the station wagon, new products being introduced and appealing Aerospaciale SA-341 Gazelle. Bosch decided to land on the roof! demonstrated. The event has grown to This helicopter and six other kits shown Egads, claustrophobia! its present size from what in the early at Toledo, used Dieter’s drive train. Only No thanks to the miserable weather, days was a small get-together to ex­ the Gazelle, however, had his new Hil- I was unable to see Bosch loop or change valuable information about the ler-variation collective pitch head. The demonstrate autorotation with the Jet new hobby. Gazelle was later demonstrated in flight Rangers. I was able, however, to watch Model helicopters have put some of and flew well. some of Dewey Broberg's boys fly their the old magic back into Toledo, because Pushing and shoving a little further, new DuBro Sharks. The Shark looks like our branch of the hobby is still relative­ we found the Kavan exhibit. Two of an easy ship to build and service. Every­ ly new. At the 1974 show, many model­ Kavan’s U.S. field representatives, Dario thing is out where you can get at it. This lers were looking for new technical Brisighella and John Simone, were mys­ is quite important, and many times I ’ve ideas. Some were looking for a new tifying patrons with explanations about spent an hour or more on scale type or simple helicopter at a price break­ the Jet Ranger’s features, the low fuel closed fuselage models, pulling the main through. Others sought fancy kits with warning light system, and all the rest. drive train out and reinstalling it just to new and different fiberglass fuselages. But what I wanted to know was how do 30 seconds of work on some inac­ As I squeezed into the crowded aisles well did the latest Kavan rotor head cessible component. at Toledo, the first helicopters to come modification really work. It’s always Once back in the warmth of the into sight were seventeen being exhibi­ been my contention that the rotor display hall, the other exhibits were ted by modellers in the static judging head, not the drive train, is the heart toured. MRC was displaying a large area. A few were scratch-built, but of any model helicopter. And Kavan Kalt Bell 212. This machine was larger most were from kits. Two outstanding has for some time been trying to im­ than the Graupner 212 and had a rotor models were Bill Ellis’s magnificently prove the rotor head used on his Jet span of 67 inches. The mechanism was detailed Jet Ranger and John Werne’s Rangers. His latest modification is a Schluter’s, with a special collective pitch Bell 212. Several of the copters, such as cross between a Bell and a Hiller sys­ head added. It was apparent at Toledo Fay Peoples’ Jet Ranger, had blinking tem. that manufacturers were moving towards navigation lights which operated from My question about the new Kavan catering to people who wanted collec­ morning to night without dimming. head were soon answered. I followed tive pitch. I suspect many beginners John Keats’ scratch-built also stood out. Ernie Huber and Mike Bosch out the want the hard-to-repair and complex

MAY 1974 59 foam wing cores with plastic covering. Price was not announced at Toledo. CUSTOM R/C Ace Radio, Higginsville, Mo., one of CAR PARTS the pioneers of R/C supplies, showed INC. its expanded line of pulse single channel HRE — 210 Bearing Blocks equipment, as well as the new four, six, HRE - 001 Chassis (CAN DOUBLE AS WING and eight channel transmitters to match T-6 .080 Al. S8.95 TUBE MOUNTS) the 2 to 8 channel digital receiver and servo. All these in kit form, and if you HRE - 200 HRE - 019 like to “ roll your own," a letter to them Power Adjustable Engine Mount USE ANY 1/4" DIA. at Box 301 in Higginsville, Mo. should get you a flyer on these items. Ask Rear End $16.95 (for Veco 19) AXLE, AND TAURUS, about the big catalog, too. $8.95 ASSOCIATED, OR MRP INCLUDES: MACHINED BEARING One of the most interesting plane BLOCKS, (4) POWER ADJUSTMENT GEARS. kits for the sport flyer was shown by SPACERS, AND BALL BEARINGS. J.E.M. Enterprises. It ’s called “ Quick One,” and features a most unique de­ HRE Inc., P.O. Box 4658, Irvine, California 92664 sign. J.E.M. says it is very easy to build and maintain, and although it is a tail dragger, they say it takes o ff great . . . FLY LINE MODELS even when the pilot is semi-skilled!! CLASSICS IN 3 4” SCALE I wish I had a picture of it, as it looks Its here ! very racy and the rudder is on the The historic bottom side of the fuselage, which B e l la n ca narrows down to almost a boom just ‘S k y r o c k e t ” aft of the radio compartment. The plane handles engines from .19 to .40 and spans 51 inches. Has cut foam core AIL KITS INCLUDE TOP QUALITY PRINTC0 wings and the rest is standard balsa BALSA. SCALE WHEELS 0ECALS. ANO SUPER 0€ TAIL ROLLED PLANS BV HERB ClUKEY construction. If you want a nifty look­ ing sport plane, you should drop them a ΐ]0Χ ÁfoHúcoupe line for a poop sheet on this one. Kit is

22 V2 ’ WINGSPAN FOR only $34.95, and they even offer your RUBBER C02. OR D10 POWER A BIT money back on a guarantee if you are OF NOSTALGIA ANOA DELIGHT TO BUIlO FLY LINE MODELS not satisfied with the performance 10643 ASHBY PL claimed in their specs. That’s confi­ TATONE PRODUCTS •SEE YOUR LOCAL HOBBY DEALER· FAIRFAX.VA IBO· OENIVA A V . BAN PWANCIBCQ, CA. «Oil· dence! Write 'em at 521 Bies St., Michi­ Standard Distributor Discounts gan City, Ind. 46360 and mention that your local hobby shop . . . you’ll most you read it here, please. likely buy one or more. The Pin Clamp Long Island Hobbycrafts Inc. showed . . . (see drawings) is the neatest little fotir o f the famous Nick Ziroli designs; item I ’ve run into in a long time. Basic­ all stand-off scale and designed for ally it is a nylon washer with a neck sport flying. Included in the group are which is a press fit on a straight pin. the P 47 Thunderbolt, the Focke Wulf When pinning down balsa parts, the 190, the F8-F Bearcat and a dandy sleeve gives you extra surface holding looking Stearman PT-17. I really dug area and the sketch tells it much better the P47! than I can. Especially good for holding Incidentally, when Nick Ziroli was sheeting in place while the glue sets. producing kits under the Major Model This item was developed and produced label, he made an Eindecker, a Morane by Chris Chambers, Chuck’s son, who Saulnier, and a fine sport plane that is now getting into the Rocket City flew with anything from a .15 to a .40 action. . . . called the Mirage. The Mirage was A new adhesive for attaching sheeting built in one piece and I started one a to foam wings is “ Red Tak," marketed few years ago. Never quite finished it by Westcoast R/C Products, 12084 and (dumb me) sold it at the club Woodside Ave., Lakeside, Calif. 92040. auction. Ed Phillips, of our local club, With that red color you sure can tell if ended up with it, installed a K&B .40, you got the stuff all over the foam and and has had hundreds of flights on it. the balsa wood as well, when you want Admittedly the .40 is a bit much, but to get a good job done on a wing. They will easily handle engines from .80 and it is a fantastic flying plane. Nick, had some samples on the display table larger, down to .09's. A note to them when you read this, how about getting and sure enough you couldn’t get the at 3919 "M ” Street, Philadelphia, Pa. Long Island Hobbycrafts to put the kit balsa to come away from the foam 19124, will get you a full color brochure out again? You can write to these folks core . . . I even tried picking it away fully describing the Cirrus 3000 glider at 722 Cross Bay Blvd., Broad Channel, with my fingernails and it held firm. kit and others, along with boats, and the N.Y. 11693, and they will send you spec You can write them and get prices and starter I mentioned. sheets and pictures of the stand-off additional poop. Tell 'em we sent ya. Quarter Midget fans will like the new scale Ziroli planes. If you dig scale and Some interesting items from a new Sig Minnow soon to be released by Sig want a very flyable plane, this is your name in modeling, the Peerless Corpor­ Mfg. Co. Featured are formed plastic chance. ation, include some very good looking fuselage halves . . . an internal fuselage Smiling Joe Bridi showed his new .40 glider and sailplane kits, and a couple profile o f solid balsa similar in design size Super Kaos, along with a new Bipe of super-strength electric starters that to their new Chipmunk and P-51, and and an RCM Trainer Jr. Joe also has a

62 MODEL BUILDER HOBBY WING SPAN...... 52 INCHES WING A R E A ___ 507 SQUARE INCHES WEIGHT ...... APPROX. 5 POUNDS POWER ...... 35 to .49

$ 4 4 .? *

...... 52 INCHES WING AREA . . .. 546 SQUARE INCHES WEIGHT ...... 4!4 to 5% POUNDS SUPER KAOS .40 POWER ...... 35 to .49 BRIDI HOBBY ENTERPRISES 1611 E. Sandison St., Wilmington, Calif. 90744 / Canadian Rep., Logictrol-Canada. 200 Bannerman Ave., Winnipeg, Man. poxy paint. Since I have been up to my stored faith in my flying ability when I the engine has down thrust added. This ears in law school, and thus, very short was able to bring the ship down real can be accomplished by the addition of on free time, good friend and outstand­ slowly, nose high, and keep the nose up a 1/16 inch washer under the top ing modeler, Earl Harding, of the Valley during the short roll-out. The “old Pro” mounting lugs. Flyers, painted the “bird” for me and I held the prop clear until the plane had The model should balance 1-3/4 will forever be in his debt. The finish practically stopped, and only dragged it inches back from the leading edge of the was given a fast “ rub out” using a mild a few inches. Hardly took the finish wing, or almost directly under the peak rubbing compound, with good results. off, and I ’m still using the same prop. of the pylon. Be sure that all rigging is Hobbypoxy is easy to work with and Try that on your Formula I job! · secured before any test gliding or flying. the resulting finish is always good when The Lincoln Beachey responds well to the paint is properly applied. Beachey...... Continued from page 33 all normal adjustments and recovers I installed a new muffler-equipped, install the plywood firewall. The cowling rapidly from unusual attitudes. The glide K&B 61 engine in the “Super Kaos" and is optional and can be made from sheet is shallow and fast, but very stable. If it has lived up to my expectations. After balsa or the bottom of an aluminum soft you experience looping under power a few runs in the air with the engine drink can. The model will perform flight conditions, increase the down alternately breaking into and out of a equally well with or without the cowl. thrust slightly. Pay particular attention rich four-cycle, it is beginning to come Complete the rear of the fuselage and to the ailerons at the trailing edge of into its own with plenty of power and give it 2 coats of clear dope. Since the the wing, any warp here can be a real an idle that is a joy to behold. real aeroplane was left uncovered in the thrill during a full power flight. · Having not flown a true pattern rear sections o f the fuselage, you may machine of the caliber of the "Super want to leave your model uncovered to R/C Report. .. Continued from page 15 Kaos” for a few years, my attempts at show the rigging. At least one of the Boxes and their impressive record. some of the more exotic maneuvers had aeroplanes did have the fuselage com­ It is impossible to even mention all me in tears of laughter. Boy, when you pletely covered and I have found that of the items shown, so I ’ll just have to don’t practice, things go to hell in a the performance was improved. hit a few that should interest you. For hurry. COVERING example, Du-Bro showed their new To sum it all up, the radio has Cover wings and tail assembly with Shark helicopter. Priced the same as the worked without a "glitch” and is, in my black tissue in the usual manner; spray earlier Hughes 300, the Shark is an opinion, as good a radio for the price as lightly with water and pin frames down evolution of this earlier model. The you can buy. Joe Bridi’s Super Kaos .60 to prevent warping. The original fuse­ fuselage, I guess you call the passenger is a fine pattern machine, as Joe him­ lage was silk covered and has held up pod the fuselage on ‘copter, is sleeker self has proven at many contests, and much better than tissue. The choice is and the rotor blades are slightly shorter. the K&B 61 will haul it straight up with­ yours. When the fuselage is covered, in­ Du-Bro claims this to be the quickest out a qualm. Carl Goldberg's tried and stall the rigging pylon over the cockpit and easiest construction of any ‘copter proven retract system is reliable and his and give the fuselage at least 3 coats of kit . . . price is $350, which includes the new retract servo and attending micro clear dope. The wing and tail assembly O&R motor and all fittings . . . but less switch activating mechanism seems to be will get 2 coats of thinned clear dope. radio, of course. living up to Carl’s reputation for putting The fuselage was aluminum from station Rocket City Specialties, 103 Whole­ out a moderately priced and well en­ No. 4 forward, in case you want to sale Ave., N.E., Huntsville, Ala. 35811, gineered product. apply colored dope to your model. showed its complete line of accessories. Incidentally, that photo by Frank Install wing panels, rudder, and ele­ Two new items included a new switch Capan of the ship sitting on the main vator. Block up the wing panels to give mount that should be on your dealer’s gear and the prop was not faked! Dur­ 1-1/2 inch dihedral under each wing shelves by now, and an item called a ing one particular flight, the engine tip. When the glue has completely dried, “ PIN Clamp.” The switch mount in­ stopped on compression, and quite coin­ install the rigging on the wing and tail. cludes a fitting for the “Off-On” push cidentally, the linkage to the nose gear Complete the model by installing the wire to dress up your installation. Look came apart (Keepers do help!). It re­ engine, tail skid, and cowling. Note that at this item the next time you're in

MAY 1974 61 PEANUTS!! OUR LATEST PLAN 1936 FARMAN PLANS MOUSTIQUE GENERAL ARISTOCRAT CABIN MONOPLANE 12" spon. Stick and tissue construction. . . . 65 cents by 1910 FARMAN MONO. Peanut plans by Hannan. Bill Hannan Stick & tissue type, bags of areal 13“ span.$1.00 13 ” span. PIETENPOL AIR CAMPER. Peanut plans by Peck. For rubber power. Stick & tissue type. A classicl Includes photos Stick & tissue type. and judging 3-view ...... $1.00 A c u tie l. . . . 75 cents DEMOISELLE. Mooney's salty French Peanut 65 cents MILES M .18. Cute low-wing two-seater by Professor FULTON HUNGERFORD SPOKE WHEELS. Fine light- CVrO KARLSTRÖM W all Mooney. 12“ spon Excellent! 65 cents weight units add the finishing touch to any vintage model. Many sizes available. DRAWINGS WATERMAN RACER, by Davo Stott, F.A.C. SENO 25c FOR ILLUSTRATED CATALOG 12%" span. Stick and tissue construction.. 65 cents California customers add 6%- W. C. HANNAN. GRAPHICS. P.O. BOX A PILATUS TURBO-PORTER Peanut plans by Hannan.75c FIRST CLASS pottage add 35c ESCONDIDO · CALIFORNIA 92025

on prop carving by Chuck Gill. Grish makes 8 x 6, 9 x 6, and 10x6 pusher Wing Span 72 in props, but a low pitch, larger diameter Wing Area 480 in» prop seems better for this model. Weight 20 oz The wings are standard construction, Surf. Loading 5.6 oz/ft2 WITH SO MANY MACHINED with two inner main spars, false ribs, and PARTS 6 SUCH DETAILED INSTRUCTIONS, TO FAIL a sturdy leading edge set diagonally. The WOULD RE0UIRE DESTRUC­ dowel supports are hardwood pieces TIVE INGENUITY! drilled to take 1/8 inch inside diameter brass tubing. The plug-in design may seem inadequate at first glance, but SEE Y O U R DEALER FIRST ( remember, the wings aren’t cantilevered in the same fashion as most gliders, but R IT A Il OROIKS SHIPMD POSTPAID Celit. Res. add 5% tax are supported by very functional struts. NO C.O.D. PLEASE The best way to position the dowel support blocks is to install them loosely, block the wings up on a flat surface with Value Engineered Products 5651 Kelvin Avenue, Woodland Hills. Calif. 91364 the proper dihedral, and insert tempor­ ary 1/8 inch music wire dowels. When production engine would have a chance trying to drag the heavy cable around. everything is in alignment, sock the in international competition. There are The heavy cars had less trouble, but epoxy to it. some super-hot 15’s around . . . if we were still slowed down several MPH. At Radio-electronic supply houses usual­ could just get Rossi to make one with the annual national meeting it was pro­ ly carry spade bolts, if you can't find the exhaust turned around for car posed to reduce the cable size to .055, them in the hobby shops. These are in­ use . . . which is between the old .051 and the stalled in well-epoxied plywood beds to NATIONALS new .059. This was voted down by the hold the strut ends. The Nationals last year was the first membership because of the greater safe­ When building the struts, first rig up big race to be held on the newly ty margin of the large cable. It is my the wings and block them into proper adopted .059 cable. This caused the feeling that the weight limit should be alignment and dihedral. Now, with the Dooling powered cars to be slowed lowered from 9 lbs. to 7 lbs., and the plane in front of you as a guide to down from four to ten miles per hour. .055 cable used. Less weight would pro­ proper strut length, you can make up The OPS cars weren’t affected quite as vide the necessary safety margin. the four required. Unless you’re an abso­ much, so for the first time in many In a 4 cycle engine, the strokes are re­ lute perfectionist, none of the four years the Dooling had to take second ferred to as Intake, Compression Power, struts will come out the same length. place to another engine. In fact, this is and Exhaust . . . or as my old Uncle When they’re all in place and adjusted to the first national race that was not won Clem would say, ‘‘Suck, Squeeze, Pop, length (small changes can be made by by a Dooling since they were introduced and Phooey!” · bending the 1/16 inch wire ends), re­ in the 1940’s! The king is dead, but move them one at a time and scribe C, W. J n r.. . . Continued from page 13 other engines are taking its place. identification marks on one end o f each Phil McDonald’s OPS car took first lage-mounted servo. This area under dowel. We use FR, FL, RR, and RL. The place in the custom class with a speed tlie floor also provides access for attach­ balsa streamline fairing is a final touch of 159 MPH, to show the way of the ing the wing hold-on rubber bands to the that is not necessary, but certainly im­ future. Most of the talk was about the root rib cup-hooks. Note that the 1/16 proves tiie appearance. upcoming world meet to be held at inch ply sides o f the nacelle must be The landing gear is scale in size and Anderson, Indiana the first week of slipped over the wire wing dowels before position. When flown from grass fields September, 1974. Several people are assembly of the nacelle. the plane will sometimes ride up on its planning cars for the smaller classes, and Depending on the engine used, a left- nose, mostly due to the high thrust line. talking about the OPS and how to tune hand prop may be necessary. For some If you feel this will be a problem, the it for top performance. engines, you can obtain a left-hand gear could be moved forward; however, The people who weren’t talking a- crank. If not, it isn’t all that bad to generous portions of up-elevator when bout the world meet were complaining carve your own prop, and chances are first applying power will usually over­ about the new cable size that was like you’ll never need more than one. If you come the problem. putting on the brakes for most cars. still have your September 1969 M.A.N. The plane as shown is very close to The light cars had traction problems around, you'll find an excellent article scale. Karlström 3-views were published

64 MODEL BUILDER line o f accessories, such as landing gear blocks, bent wire landing gear, and so on, along with a very good wing jig at THE WORLDS LARGEST- only $12.95. This jig will fit all the LEO KITTED MODEL AIRPLANE Bridi k its . . . as well as other wings, and will give you a very true wing panel with minimum effort. These new Bridi WITH SAILPLANES . . items are due out and probably will be in your hobby shop by the time this . . . BIG IS BEST hits the newsstands. Ask your hobby dealer. LEO IS THE BIGGEST Airborne Associates, 4106 Breese- wood Lane, Annandale, Va. 22003, (notice how clever I get the address in there so you can write to them?) had LOOK AT THESE FIGURES: more fine fiberglass fuselage/foam wing planes in their line. Newest, along with WINGSPAN ...... 12 ft., 7 in. Kirkland’s "Nutcracker” and Chidgey’s L E N G T H ...... 6 ft., 4 in. “Tiger Tail,” is Don Lowe’s very new Phoenix 6. This particular kit features ASPECT RATIO ...... 12 to 1 what I think is the finest o f workman­ WEIGHT (M IN.)...... 7 lbs. ship in a fiberglass fuselage, with bulk­ heads and engine mounts installed. The WEIGHT (WITH BALLAST) fuselage is already joined, and a razor- ...... 11 lbs. sharp fin, along with the rudder, is an integral part of the molding. I just re­ LIFTING SURFACE AREA . . ceived one of these kits for evaluation 2,160 sq. in. and hope to start on it soon. It is a kit of superior quality and design, and if you MINIMUM SURFACE LOAD­ lean toward this type o f construction, you should write them for their bro­ ING ...... 7.5 oz./sq. ft. chure. WING LOADING*...... This could go on forever, and I could probably fill the entire magazine 8.5 oz./sq. ft. (Min.) with a paragraph about each item shown. Those I mentioned are but a few of so many outstanding offerings, it is not *WITH BALLAST, THIS CAN possible to cover them all. BE INCREASED TO 13.4 Oz. Change of subject: Wonder if you PerSq. Ft. FOR SUPERIOR have noticed at your flying field that PENETRATION. there are more youngsters getting into R/C? It seems so at my field. O f course, younger than I am covers many years, REMEMBER, THE IN­ but I’m speaking of the kids. Fortunate­ TRODUCTORY PRICE ly this hobby is expanding, and these kids are managing to scrape together OF $99.95 IS FOR A enough to get a radio and get into the LIMITED TIME ONLY! action. Perhaps the old man realized what a wholesome and rewarding activi­ ty building and flying R/C planes can be (213) 340-2114 and bankrolled the kid . . . next to college it might be the best investment 5651 KELVIN AVENUE the old man makes. WOODLAND HILLS, CA. 91364 Watch for the kids and lend them a helping hand. It’s so gratifying to see them learn to fly and enjoy the fun and T-Cars .... Continued from page 49 fellowship. They are full of questions but that Russian engine must be putting and often are too shy or embarrassed any “6 0 ” on the market at this time. out a fantastic amount o f horsepower to ask, and need encouragement. The 5cc, or .29 cars, are truly phen­ to reach such a speed! Hope I ’m not biting off more than I omenal. The 5cc record is now 160.60 The 2.5cc record is 145.25 MPH, can chew, but youngsters; if you are miles per hour, held by Peter Ziegler of held by Marta Mondani of Italy, and starting out in R/C and need help or Germany with a car and engine that the 1.5cc record is held by Imre lharosi advice, drop us a line and maybe we were made in Russia. Peter had the car of Hungary, with a speed of 122.90 can steer you right. Until next month for two years and is just now getting it MPH. Most of the cars and engines in it’s back to the old building board and to run properly. This record is even the smaller classes are custom built those two planes I started at the same more outstanding when you consider because of the lack of engines adaptable time. (How could I do that?? let’s see that there are only half a dozen 10cc to cars in the small displacements. An­ now . . . start one . . . finish same one cars in the world that have run over other interesting point to note is that . . . then start another, finish it . . . oh, this speed. In the European rules there 1.5cc works out to about .091 cubic well, it’s just as much fun the other is a weight limit for the various classes. inches, while most of the “0 9 ” engines way.) This limit is 4.9 pounds in the 5cc class, made today are of .099 displacement. Frank Schwartz, R/C Editor, 2400 and the cars run on a .041 diameter However, with the lack of hot engines West End Ave., Nashville, Tenn. 37203. cable. The small cable is a great help, of this size, there is little chance that a

MAY 1974 63 SO LONG, $7 5 5 OLD TIMER 32" Span MINIATURES .020 FREE FLIGHT

ALL CONTEST WINNERS

BROOKLYN DODGER, S7 55 32" Span

STRATOSTREAK, $755 3 3 " Span PLAYBOY SR., $755 ^ At your dealer, 36" Span B or add 75tf per kit for mail order.

CAL AERO - MODEL 7142 BLUESAILS DR.. HUNTINGTON BEACH, CALIFORNIA 92647

HEY GLIDER MAN ! gives the stabilizer more power to main­ Sailplane C to be the same as A and B tain the wing at the desired attitude except for the CG at 40 percent and Want o higher launch? (angle of attack). Result: greater stab­ stabilizer at 2 degrees negative to the How about 1000ft I ility. wing. This configuration will be the

Got a »mall field ? If all this gets a bit confusing . . . fastest of the three because its wing is Big enough to land — well, let’s try some examples. They not required to operate at an angle of Big enough to launch I should help. Assume Sailplane A has a attack as great as either A or B. A better 30 percent CG position. To offset this ratio of lift to drag (L/D ) is realized. But Tired of chostng the launch line ? nose heavy condition, assume the stab­ automatic longitudinal dynamic stability Drop o PARA-POD ot your feet I ilizer is set at 6 degrees negative to the will suffer. wing. Next, assume Sailplane B with a The Sailplane C configuration re­ with 22**porochute J 6 ^ 35 percent CG. For desired glide trim, quires an 8 degree upset before stall Sil TOUR DIALIR FIRST t assume it’s stabilizer is at 4 degrees nega­ occurs. As the stall attitude is reached,

0*™«I arWni M immy mém h r tive to the wing. Other than balance . . . its stabilizer force of plus 8 degrees ρ·*«-*·Μ *1 1 .·.,. C ·!«·»!· οόΛ Wk ‘t o u ý ž - s á Urn M. COD CG position . . . and stabilizer setting, (10 degree stall minus 2 degree stabilizer the sailplanes are identical, including setting) will provide a relatively power­ OMUn-OWrAuiM. Value Engineered Product» wings which utilize an airfoil section ful tail up/nose down action. However, 5651 Kelvin Ave.. Woodland Hills, Calif. 91364 that stalls at a 10 degree angle of as the nose falls in stall recovery, very individual. It goes kinda like this. Any attack at a given air speed. little stabilizer force will be available to sailplane will fly with an infinite number Now, assume that both Sailplanes A stop the downward plunge . . . only of trim conditions. A forward CG posi­ and B are upset by vertical gusts. The minus 2 degrees as the wing passes tion . . . say at the 30 per cent average Sailplane B wing angle of attack can be through the 0 degree angle of attack chord point . . . will provide a greater increased 6 degrees before stall occurs position. This allows a long, swooping degree of dynamic longitudinal stability and the nose drops for recovery. The dive which develops extremely high air than an aft . . . say 40 per cent . . . CG Sailplane A wing, which flys closer to speeds, followed by great, corrective position. Also, the more forward CG the stall under normal conditions, need zooms upward and subsequent second­ will result in slower flight speeds. And be upset only 4 degrees before stall and ary stalls. Sailplane C approaches the the more forward, the more stable and subsequent nose down recovery is ini­ neutral dynamic stability definition. more slower . . . so to speak. Well, tiated. For simplicity, consider a single In each of the three example sail­ within limits. point in time during the nose down planes, the stabilizer is set at an angle Here's why. A sailplane that balances corrective oscillation when the wing is negative to the wing. This arrangement forward of its wing’s CP position, for at 0 degrees angle of attack. At that works to correct high angles of attack any given angle of attack, is nose heavy. instant, Sailplane A stabilizer will have a and effect stall recovery. Though the Brilliant! This acts to rotate the nose corrective . . . tail dow n__ force equiv­ stabilizer’s negative relative angle pro­ downward, and without corrective ac­ alent to minus 6 degrees angle of attack. vides an “up’’ elevator force in normal tion results in a spectacular descent. To Sailplane B will have stabilizer power gliding flight, it also provides a force offset this situation, a downward force equivalent to only minus 4 degrees angle tending to raise the tail . . . and lower at the tail can be created either by of attack. In these examples, it is the nose . . . as the wing stalls and loses stabilizer negative angle of attack or assumed that the stabilizer airfoil is a its lift. Assuming that the stabilizer air­ “up” elevator. This causes an opposite symmetrical section with no lift at 0 foil section stalls at the same angle of and cancelling rotary motion, forcing degrees angle of attack, and similar attack as the wing . . . which is highly the wing to a higher angle of attack. The positive and negative force at positive improbable . . . the Sailplane A wing higher angle o f attack causes CP to move and negative angles of attack. would stall 6 degrees sooner than its forward, and thus bring CP and CG Under the above conditions, Sail­ stabilizer; Sailplane B, 4 degrees earlier; back into a balanced relationship. With­ plane A will be more solid in the air and Sailplane C, 2 degrees. in limits. Also, the higher angle of than B. Sailplane B will be more easily It might seem that Sailplane C would attack generates more lift, but at a upset, make corrective oscillations of have less tendency to reach high angles significant increase in drag. Result: greater amplitude for more cycles, and of attack since it flys with the least slower flight. generally be less dynamically stable negative stabilizer setting . . . less “ up” The greater difference between wing than Sailplane A . . . because of less elevator force. This is true for upsets and stabilizer angles of incidence . . . stabilizer power to hold or return the caused by wind gusts. The more com­ resulting from the negative stabilizer wing to its proper flight angle. mon problem, however, is the extreme setting to offset the forward CG . . . Let’s go one step further. Assume a angle of attack, which results in a stall

66 MODEL BUILDER P r o ROD NYROD S u -P r-ROD MASTEROD ASIEROD-XF

The Leader in ADVANCED Push-Rod Systems for Over 7 Years PLAINFIELD, ILLINOIS 60544 in the July 1957 M.A.N., and U.S. Civil transmitter. A typical graph prepared by NACA Aircraft Vol. IV by J.P. Juptner has the Neutral static stability can be likened (now NASA) for the Clark Y section is full particulars. Whether you build it for to the flight o f an arrow. Wherever it’s shown in Figure 2. Similar data for the scale competition or not, putt-putting pointed, it goes. NACA 6409 are in Figure 3. A charact­ around with the C.W. Junior is different, A statically stable sailplane is one in eristic which is of particular importance relaxing, and just plain fun . . . and one which the several forces and moments to longitudinal stability is also shown prop can last forever. · are so arranged and are of such values on most airfoil plots: center o f pressure that the vehicle tends to return to a (CP) position as a function of angle of R/C Soaring . . Continued from page 25 normal flight attitude no matter how or attack. If a sailplane is dynamically stable, to what extent it may have been upset. Consider an airfoil section’s center each oscillation will diminish in ampli­ It all has to do with laws of physics and of pressure to be its center of lifting tude until steady, unaccelerated flight is such . . . which every sailplane under­ pressure or, simply, center of lift. The reestablished. If the oscillations increase stands and follows whether or not the center of pressure (lift) of a curved sur­ in amplitude . . . the nose up/nose down pilot knows what’s happening. face, such as an airfoil, moves toward corrections getting progressively more Everyone can agree that positive the section’s leading edge with increased exaggerated . . . dynamic instability is in static stability in all axis is good stuff. angle of attack. It moves aft at reduced evidence. A sailplane with neutral dyna­ Sailplanes just should not be designed angles. Figures 4 and 5 illustrate this mic stability goes o ff into the sunset to self-destruct. With concurrence on travel in relation to a given CG position happily oscillating all the way with no this point, the pros and cons of static which remains fixed . . . naturally. In change . . . for better or worse . . . in its stability can be dismissed and full atten­ Figure 4, the center of pressure (CP) erratic mode of flight. tion directed to dynamic stability. is forward of the CG, opposing correc­ This stability/instability stuff is true Dynamic stability, as with most tive action. In Figure 5, CP is aft o f CG, for roll, yaw, and pitch, but of the things, comes in varying degrees . . . again opposing corrective action. Un­ three, longitudinal motion is of greatest from not much, or even negative values, fortunately, airfoils typically used on concern to the R/C soaring pilot. Sail­ to great gobs. Again, as with most R/C sailplanes are statically unstable in planes pitch stability affects stall char­ things, moderation is probably the best just this way. Their natural characteristic acteristics, control sensitivity and re­ policy, because even with dynamic stab­ is to aggravate an upset rather than to sponse, maneuverability, and thermal ility, either too little or too much can help improve it. This can be demonstrat­ sensing capabilities. Might say that pitch be undesirable. Since dynamic instab­ ed with any one-piece wing assembly. stability has much to do with general ility (wherein the amplitude of the so- An attempt to glide the unit usually re­ soaring performance. Marginal roll and called corrective oscillations increase sults in a backward rotary motion. yaw stability can reduce performance with each cycle) results in a pretty wild Note that the CP travel for a given potential by degrading flight efficiency, bird, let’s forget it. Same with neutral angle of attack range is less for the Clark but pitch stability is essential. dynamic stability. It we don’t need. Y (Figure 2) than for the NACA 6409 Chances are that few soaring enthu­ What is worthwhile . . . make that (Figure 3). Between 0 and 10 degrees siasts have ever seen a sailplane that was “ necessary" . . . for successful R/C angle of attack, the Clark Y CP moves statically unstable. They’d have to look soaring is positive dynamic longitudinal from the 42 per cent chord point to the quick. Its flight performance would be stability. 32 per cent point for a total movement almost unbelievable. A sailplane that was There are two readily adjustable, in­ equivalent to 10 per cent of the airfoil unstable in pitch, for example, would terrelated elements that affect dynamic length. The CP on the NACA 6409 not necessarily lower its nose after longitudinal stability: mass balance moves from 56 per cent at 0 degrees to stalling. Rather, it might maintain its (longitudinal CG location) and stabilizer 37 per cent chord point at 10 degrees nose up attitude or even flip inverted. power. These factors must be com­ angle of attack. Total travel almost It might literally tumble or possibly patible with the wing’s center of lift if twice that of the Clark Y CP. This shows tail-slide right to the ground. Should an acceptable level of dynamic stability that the flat bottomed Clark Y section the nose be lowered, a statically unstable is to exist. is the more stable o f the two. It will beast might continue to tuck under as if Every airfoil section has certain aero­ require less stabilizer power than the entering an outside loop instead of the dynamic characteristics. Each has a co­ undercambered NACA 6409 for a given nose raising as a result of the increased efficient of lift, for example, and a level of automatic longitudinal stability. speed. The descent of a free-flight model coefficient of drag. Accordingly, each from which the tail surfaces have broken section has a unique lift/drag ratio Now, how to make all this wealth of away is a pretty fair demonstration of (L/D ). The values of these are depicted knowledge work in the trim adjustment pitch instability. Such a configuration as curves on airfoil characteristic plots of a sailplane? It’s got to be a trade-off definitely would be a handful at the published by various technical agencies. . . . a compromise . . . to satisfy the

MAY 1974 65 line. Some o f the stuff is pretty humor­ REPLICA OLD TIMERS ous. Note how we try to cater to you, .020 POWERED the reader?? Well, this is a democratic AUTHENTIC SCALING - MACHINE CUT PARTS column!! FREE FLIGHT - RUDDER ONLY R/C Next issue we’re gonna describe the Texaco Contest put on annually by the SCAMPS. With Sal Taibi running things, and Nan providing the coffee and dough­ nuts for the sleepyheads, this meet, run between 6 and 10 AM, should be a real • · Goldberg's 1940 Sailplane Struck's 1940 New Ruler Berkeley 1937 Buccaneer “dawn patrol.” Ach himmel! Vot a vay 6:13 Scale 36" Span 31" Span / 150 Sq. In. 2:5 Scale 36" Span to go! · $9.95 $9.95 $9.95 Counter...... Continued from page 7 1940 Megow Ranger $8.95 / 1937 Miss America $8.95 / 1940 Scientific Mercury $8.95 wrong track. This profusely illustrated | p p n Μ Ο Π Ρ Ι C Standard terms to Dealers and Distributors. IVIIL^Ixw IV IL rU L .I-D Mail orders: See your Dealer first. Add 75c book has obviously been written by a P. O. BOX 1273 per Kit for postage and handling. Cal. resid- modeler whose throwing arm has heaved CO VINA, CALIF. 91722 entsadd 5% sales tax. many an all-balsa glider into the lower atmosphere. Furthermore, the manu­ magazine of national distribution, we script for the book was proofed by Bob

( PEANUT SCALE ACCESSORIES might get a bunch of eager beavers Hatschek and Jack Minassian. to compete. (Side note to Jim Adams: With his sketches illustrating every If you correctly identify them this step of the way, Kaufmann takes you time, it’ll be better than an Ohlsson 23!) through selection of materials and tools; All entries should be addressed to construction of each portion of the the 1936 Nats Winners Contest, Model model (including a flip-up stab dether- Builder Magazine, 1105 Spurgeon, Santa malizer); trimming, test flying and ad­ Ana, Calif. 92701. Incidentally, just justing; launching method, picking ther­ to get you off on the right track, the mals (including wind sticks and thermal man with the Wakefield Trophy in the streamers) and contest flying. center, front row, is A.A. Judge from Finally, a good basic 14 inch span MILES M l 8 KIT $2 .9 5 PIET ENROL AIR CAMPER England. Now the rest is simple! design is used throughout the book, and RUBBER POWERED FLYING MODELSI if NOT av a il Atilt AT YOOtt DEAL £·. OROCft DIRECT ADD 3St f OR CONTEST SCHEDULE a dimension chart for building it in 16 POSTAGE A HANDLING CAUfORNIA RESIDENTS ADD 6 Y . TAX SEND 25» rO» CATALOG - HARD TO fIND ACCESSORIES. KITS AND Outside of the California contest and 18 span sizes are also shown. PLANS fO» SMALL » U t» E» MODELS schedule, the writer hasn’t received a This is a great book for the modeler ______O. BOX 2498 * MB heckuva lot ofinform ation on old timer rtCK-røtymirs l a m e s a , c a u f 9 2 0 4 1 who wants his offspring to get properly contests around the country. Received into the hobby and needs some help in a real humorous letter (and didn’t recog­ recalling all the things he wants to pass CLASS A/B COMBINED nize it as such at first) from Warren on. (The old man may learn a few 1. Jerry Otis Shipp of Brooklyn, N.Y., who sent in a things too). (Zipper/O&R .29) 8:38 calendar listing of contests consisting * * * 2. Hugo Lung of a blank space. In some respects that’s Whenever we read about another (Playboy Jr./Arden .19) 8:36 sad! Whassa matter with the SCAM A club wising up and adopting a muffler 3. Larry Boyer group? I know they put on a meet or rule, it always seems that the little (Ranger/Arden .19) 8:01 two. The idea of an Old Timer Contest engines, usually below .19 displacement, CLASS C Calendar can be helpful for both the are excused from the rule. This is sorta 1. Hugo Lung contestant and the contest sponsors. All ridiculous if you stop and realize that (Sailplane/Orwick .64) 13:00 we need is a little cooperation, men! the little buggers usually turn up fan­ 2. Bob Longstreet Having received some info from the tastic rpm’s and can always be heard (Sailplane/Orwick .64) 8:18 Utah State Aeromodellers (USA) of above everything else. 3. Larry Boyer Salt Lake City, we’ll try again next Logically enough, L.M. Cox, which (Ranger/O&R .23) 8:05 month. Send in those dates! produces most of the little noise makers “OLD RULER” ENGINE DRAWINGS have, at last, been the ones to come up 1. Bob Longstreet The writer was rather surprised at with a series of super-effective silencers (Sailplane/Orwick .64) 12:25 the reaction to Bob Von Koňsky's for these midget screamers. The new 2. Jack Transue suggestion to have this particular column Cox mufflers, made to fit the .020, (Playboy Sr./Ohlsson .60) 11:23 feature a three-view o f old ignition .049, .051, .09, and .15 engines cut 3. Larry Boyer engines to acquaint prospective old sound levels from 115 decibels down to (Ranger/Arden .19) 8:27 time modelers with the sizes and looks 75, at 50 feet. The unique “ tuned pipe” NAME THE 1936 NATIONALS of the old engines. If Editor Bill okays feature o f the new muffler eliminates WINNER CONTEST it, we’ll start next issue. In addition, need for a special cylinder or glow Wanna win an O & R 23 engine??· All we’ll see if we can con Tim Dannels into head, and top end power is not affected. ya gotta do is to correctly identify all releasing a couple of his good drawings Clubs should now say “ All engines the 1936 Detroit Nationals winners in a so that we can put up a rare one every must be equipped with effective muf­ photo taken by General Motors. Each so often. flers. Users of .010’s are expected to winner was given a copy of this pic. This CARTOONS play loud music on portable radios photo came from Frank Ehling, who in Just ran across a flock of cartoons while flying their planes.” turn got it from Gordon Light, then done by Joe Bickinella, who lampooned * * * model editor of Air Trails. “ Daddy Warbucks” about five years ago. We’re glad to see Len Sabato back We did run this picture in the Model If you guys are interested in laughing in the R/C helicopter business again. Engine Collectors Journal five years ago at (or with) Pond when he was called The new LENCO 100 helicopter should as a novelty. Response was extremely the “Air Arm ” of the Navy Radiation be one of the most easily built and disappointing. Perhaps this time, with a Lab, then be sure to drop this column a maintained choppers on the market to-

68 MODEL BUILDER or even a loop, caused by excess lift generated by excess air speed. Since air speed develops from the nose down GOLDEN AGE ACCESSORIES corrective action following a nose-up­ SCALE ENGINE KITS SPINNERS SCALE PILOTS ward upset . . . which may have been caused by a gust . . . Sailplane C is |j ■© 0 4 ^ ) more susceptible to this problem. It has less pullout power since its stabilizer is I ' / j ” THROUGH 3'/»" DIA. only 2 degrees negative to the wing. VINTAGE WHEELS Once Sailplane C ’s nose is pointed earth­ ward . . . even at only a shallow angle . . . a great amount o f speed will build up before adequate force is generated by the stabilizer to overcome the pro­ blem. As the nose is rotated upward out 1W SCALE of the dive, the high air speed produces WRIGHT J-5 "WHIRLWIND" % " THROUGH 5” DIA. excess lift, as evidenced by a steep ENGINE SMOOTH CONTOUR WHEELS climb, which often ends in a full stall or CYLINDERS a rather dramatic loop . . . either of which may be followed by another screaming pass at the grass. SPORTSMAN Sailplane A, on the other hand, is t P & W "W ASP" UNIVERSAL o AVAILABLE IN 1" less likely to develop a severe stall or 1", I'/,", & 2" %" V4" THROUGH 5% " DIA. THROUGH 2% " SCALE looping problem because its more pow­ SEND 25c FOR COMPLETE ILLUSTRATED CATALOG erful stabilizer setting . . . 6 degrees less than the wing . . . works to limit W iu U w s DEPT. MB . 181 PAWNEE STREET and nose down attitude and prevent ssos: SAN MARCOS, CALIFORNIA 92069 speed buildup. Now all this could get to be a bit hardly be expected. Each pilot must as well as impressions, problems, plea­ discouraging, but, remember, we’ve been make his own choice, considering his sures and performance for each flight. talking about automatic, hands-off stab­ skills and limitations. This requires ex­ Otherwise, you’ll never remember. ility. Any of the three example sailplane posure . . . repeated, methodical testing It’s all a matter of trial and error, but configurations could be flown with ap­ over the full spectrum of stability ad­ one thing’s for sure; nothing ventured propriate R/C piloting technique. The justments. It’ll take numerous flying gathers no moss. Or something like that. solid-as-a-rock stability of Sailplane A sessions to do it properly. You may even be surprised . . . pleasant­ might be appealing, but its flight char­ ly. There has been occasion recorded acteristics would be sorta like an air­ The safe way to approach the pro­ when a real dog of a glider became a borne truck . . . unresponsive and un­ blem is to make small, incremental high-performance sailplane . . . instant­ exciting . . . poor penetration and variations from an established, proven aneously . . . merely by shifting the CG mushy glide. Sailplane B approximates trim. First, work toward greater stab­ and retrimming the stabilizer incidehce. a lot o f configurations currently flying ility by adding quarter-ounce weights in Absolutely amazing. Sometimes the . . . better’n a truck, but short of the nose. Early flights with each change damn things come alive with only small potential performance. Sailplane C is in ballast can be controlled with elevator changes. Might be that your current the least stable version, and approaches trim. When the appropriate, new setting pride and joy is right on the mark . . . what is called a “pilot’s sailplane.” It is for stabilizer incidence is determined, but, then, maybe not. How ya gonna relatively fast and offers good penetra­ the stabilizer should be so adjusted and know if what you’ve got’s good, if ya tion. Its lack of stability can be inter­ the elevator trim returned to neutral. don’t monkey around a little ? . . . So to preted as “bouyancy” . . . as its glide Once a satisfactory hands-off glide slope speak. · path is upset by the slightest gust or is established with a given ballast, anoth­ er increment o f weight can be added, other disturbance, such as a thermal. Plug Sparks . . . Continued from page 47 Sailplane C gives its pilot a definite sig­ and the process repeated. When things nal when lift is encountered. Whereas A get spooky, quit. Go slowly and pay one-two for high time. Hugo Lung and and even B have a tendency to drive attention to what’s happening with each Bob Longstreet, respectively, in high right through, C bounces and bobs in revision. A nose heavy sailplane, flying time place, also won their particular turbulent air. “The lift’s over here, at the edge o f a stall, can snap and spin event. This time, hot shot Larry Boyer Dummy.” faster than a successful streaker at a gay won three silver drinking mugs for three With Sailplane A or B, the pilot can liberation convention. third places. Too bad ya gave up beer relax during most flights, confident that Similarily, small weight increments drinking, old buddy. Ha! his bird won’t get into trouble if he’s can be removed from the nose . . . or “ Make me famous” jerry Otis (his inattentive for a few moments. Not so added to the tail, if necessary . . . to favorite photographic hunting cry) made the pilot o f C. His is a highly sensitive move the CG aft. With each step, exer­ the boys sit up and take notice that thoroughbred . . . tuned for competition cise reasonable caution, as with any ex­ even though a novice, he can still be a . . . and, as with any such machine, periment. There’s no reason to bust up a threat. Last contest he won with an animal or being, it demands proficiency sailplane. Atwood powered Buzzard Bombshell, in handling and constant attention. Test flights with each ballast and trim and to show the win was no fluke, he A conservatively stable sailplane will change should include the full range of won this time with an Ohlsson powered be easy to fly, but at a performance normal maneuvers; steep and shallow Zipper! penalty. The more lively vehicle will be turns, best L/D speed, slow flight for The writer has received numerous a piloting challenge, but offer compensa­ minimum sink, and hands-off recovery requests to list the winners, with the ting soaring rewards. That is, it will if from both straight flight and turns. A type of plane and motor combinations flown with the degree of finesse neces­ few “best performance,” competition used. This should help out those fellows sary to exploit its potential. If it’s all type flights will also be worthwhile. who are doubtful as to what power over the sky, soaring efficiency can Keep notes to record balance and trim, combination to employ.

MAY 1974 67 Aloomy-um: Soft metal of light weight. Used for construction o f Mupplers, Ganding Leer, etc. VINTAGE E-G FLANS Cab-nee: Posts on top of bi-plane fuss- EDO FLOATS 47" LONG ladge to keep top wing from falling PLANS $4.00 on the pilot and obscuring his vision. ( You gotta be kiddin’! wen) Ch-ord: Straight line used between lead­ ing and trailing edge o f wing. Used so NOORDUYN MK.4 NORSEMAN PIPER J-J CUB that curved lines on top and bottom FAMOUS CANADIAN AIRCRAFT 5» FT Wing SpAn - o u . g ~ i o · · · i . c . s n i i h i · will have some place to go. (lOFAi »o« ROSS't w in 'OK Y o u »" ) Θ4 WING SPAN - MULTI Clod-kicker: One who has a module, but WMEELS-PLOATS ON PLANS is ashamed to let other people see it. PLANS $13. *5 ‘ I PLSTÍC COWL! $7.95 Plans: $ 12.95 Usually shows up with camera, wide tie, Gatsby shoes or some other de­ MDE SEND 50 i FOR 74 CATALOG TODAY / / WORLÍ vice to draw attention away from DEALERS Í DISTRIBUTORS INQUIRIES INVITED SID MORGAN lack o f flying. 13157 ORMONO.BELLEVILLE,MICH.48IIIu.sa Conway: Small yappy dawg. Contest: Prohibited. Deb-ris: All that’s left after zonk. Dee-boner: As in “he is swave and dee- boner, ain’t he?” Deco-lahge: The front of a woman’s dress. Also a shiny board for display­ ALSO FEATURED ing burnt paper. WALT MOONEY De-hydral: The upward bend in a wing, PRESENTS A ARE CONSTRUCTION caused by střeching rubber bands too A FOLIO OF WELL ARTICLES (2) AND A tight or by performing consecutive TESTED DESIGNS PAGE OF PHOTOS loops. INCLUDING 13 BAG SHOWING THE Dekkle: Glassine substance soaked from PEANUT SCALE ACTUAL MODELS paper and mixed with clear dope to a crinkle finish. > s PLANS, PLUS 2 OF SENO $5.00 (POSTPAID) En-gine: Used to keep por-po-leller from BONUS PLANS G amuts T°: WALT MOONEY falling o ff front of fuss-ladge. 2912 CABRILLO MESA FOR OTHER SAN OlEOO, CALIFORNIA Empy-nadge: Rear o f fuss-ladge. Usually TYPES. 15 IN ALL 92123 seen protruding from a pile of broken balsa and tissue. Fin: Vertical stave-il-izor, or when com­ fliers. In fact, gas is my favorite event, Kirn No. 3 works well between 77 bine with “hatty,” is a Scandinavian but I didn’t realize that the concentra­ and 100 degrees F., and at less than fish dish. tion recently has been on other than 40% humidity. F9 has produced good Frool: Smelly liquid pumped from a gas events. So, how’s this for a thought: success with K&B 40RR engines . . . container, through a series of tubes We haven’t flown gasoline powered with pacifiers, of course. Cox engines and onto the ground. Often blown models, except in O.T., for years, but seem to really stand up well with it, and into eyes by pro-po-ller and mistaken glow engines use funny smelling chemi­ just go wild on RPM. Try a 5 x 3 Top for tears. cal concoctions. Most contestants use Flight nylon propellor. Don’t balance it. Fuss-ladge: Main part of airplane. Used commercial blends, such as Cox Red (That’s right . . . don’t balance it.) Put to hold all o f the other parts to­ Can or Fox 4 0 4 0 , but how about mix­ the heavy blade on the counter balance gether. ing your own. Here are some suggestions side of the crank. Unless your prop is Ganding-Leer: Device on bottom of from El Torbellino, San Diego Orbiteers really off, the motor will RPM better fuss-ladge which is used to snag Newsletter: and smoother this way. By the way, gopher holes. Kirn’s No. I Kirn’s No. 2 using these ideas, be ready to re-trim Gard: An owie caused by friction with 50% Nitro 60% Nitro your 1/2A ships. It seems that the asphal t. 15% Klotz 14% Klotz small, light ships just go bananas. Humi-diddy: Moisture content of the 5% Castor 6% Castor air. MODELING HUMOR DEPARTMENT 30% Alcohol 20% Propylene Oxide. jass: Opposite of Knoe. This month, I am labeling the humor Note: No. 2 fuel is faster than No. 1, Module: Small replica of a biggy. section especially for Hornbeet J. Murph- but may use a plug each run, according Muppler: Noise suppressor or a scarf. to Dale Kirn. I ’ve found in F.F., the man. Please note that the following is a Murf: The sound a pro-po-ller makes in plugs may last several flights. At a buck glossary of terms defined for the neo­ tall grass. a plug that’s good news - - or is it? phyte in Free Flight. These are terms Nackell: Type of cowling on modules, The above fuels are recommended for which are used day in and day out and tapered on rear to keep air from Cox engines. should be common knowledge to any snapping shut and breaking the wing. Kirn’s No. 3 free flighter. But on the off-chance that 60% Nitro this is not the case, the following names Plascutt: Substance used in the manu­ 15% Klotz should be studied carefully so that you facture of pro-po-llers. 5% Castor don’t appear stupid when discussing Pro-po-ller: Device on front of fuss- 20% Propylene Oxide free flight with your friends. Forsorne ladge. Usually broken on one side or of you old free flight hands (that’s an if made from plascutt, is used to draw Frantic Fred’s Fabulously Fast Formula interesting event idea . . . free flight blood from finger. This small cere­ For Free Flight Fuel. (F^). hand), you will probably wish to read mony usually accompanied by mut­ 60% Nitro 2% Lubricin these definitions to fill out voids in your tering of cryptic lan-gwidge. 23% Klotz 15% Alcohol vocabulary. Stave-il-izor: Device on rear of fuss-

70 MODEL BUILDER day. Expected to sell for under $300., the non-scale model features a built up “ 7 Λ fuselage of prefabricated wood and foam BOLKOW BO-105 parts. All major mechanical components are completely assembled and ready to SCALE R/C HELICOPTER bolt in place. For further information, write to LENCO Products, 219 First St., • New s im p lifie d Buchanan, N.Y. 10511. m ech an ics ♦ * * • U se std . 61 en gines The sexy new Dieter Schluter de­ • Fiberglass fuse • Ftotor dia 65' length 55 signed "Gazelle,” scale model of a French helicopter, will be available some AVAI1ABLE AT iOUR EAVORlTE DEALER time in May from Aristo-Craft, 314 Fifth Ave., New York 10001 (contact MIDWEST MODEL Gil Rose). Displayed and flown by 3 Π 2 3 Μ 3 3 Dieter at Toledo, the new chopper was « I » w. i»m i t C W i.pl. WwMi m n a tremendous hit. It incorporates a new, 4 Ft U , U SE MODEL D 1ST tt I Hl TOR simple collective pitch system, and will SERVISE DE it IRS FOR OVER 30 1 E AR S / list at $389.95. With the addition of the Gazelle, Aristo-Craft has increased its to date. By all means, send for a free R/C helicopter kit line to 5, and plans set of 8-1/2 X 11 reduction prints so you I S T O O B T T l in the near future to announce an can see what he has done. Even if you accessory pack collective pitch head that never intend to build the Jenny, you will allow conversion of any of the pre­ should own a set of these drawings just vious kits to this system. for a conversation piece, if nothing * * * else. The detailed OX-5 engine alone is Jim Crocket Replicas, 1442 N. Fruit worth the price o f admission. Ave., Fresno, Calif. 93718, is introduc­ * * * ing several new items for the serious JP Models announces that it has free flighter. WILL ACCOMMODATE SMALL TO MEDIUM added the 98 inch span JAVELIN to its SIZED RUBBER MODELS, INCLUDING PEANUTS Most interesting, is a selection of line of R/C sailplanes. The fuselage uses VERY VERSATILE; FULLY ADJUSTABLE. cast aluminum winding hooks for scale, the same rugged 1/32 inch rolled ply­ FOLDS TO COMPACT SIZE FOR EASY STORAGE. competition, coupe, sport, and even Complete stooge, ready to use -$ 15.00 wood fuselage with a durable, fiberglass Order from; Peanut rubber models. The hooks, with nose featured on the Dart and Dart II special hard polish shot finish, are based sailplanes, and is supplied in a white JET·C c r u T t i d e sig n on the designs used by expert Wakefield epoxy finish. The fuselage is both strong 3 11A S c a rb o ro u g h R d ., C le v e la n d H ts. OH AA11Θ fliers Bob White and Jim Quinn. Other and light weight (6.5 oz.), and is de­ items include stabilizer tie down hooks, signed so that no ballast is required in F/F ...... Continued from page 39 dethermalizer kit, folding prop hub kit, the finished model to obtain the correct circle tow casting kit, and a Peanut C.G. location. dee. Some of you out there may not be up to making one o f these fancy gadgets, Scale pilot! The completed JAVELIN has several * * * but they are available, if you have convenience features. Both the wings Based on the chance meeting of its $13.00, from E.B. Turner, 3544 Granada and the all flying stabilizer are remov­ two partners at a gas station (!), a new Dr., Ft. Worth, Texas 76118. able and can be easily stored and trans­ model company has been formed. The ported in the carton in which the kit is PAPER TUBES SHOULD BE USED company is Peterson Products, and the supplied. FOR TOILET PAPER ROLLS AND partners are Ralph Peterson and Sam The wing assembly is fastened to the NOTHING ELSE Products . . . naw, Art Reiners. Located fuselage with a proven system using in­ From Max-Fax comes some interest­ at 44935 N. 10th St. W., Lancaster, ternal rubber bands and steel pins. This ing info passed on by Bill Wilson, who Calif. 93534, the company plans to allows the wing to pop o ff during hard has built several Wakefields using Estes produce a line of sport free flight and landings without any danger of separa­ rocket tubes as employed on the Max­ R/C kits. tion during violent maneuvers such as ine. Bill has unfortunately found a re­ In case the name doesn’t ring a bell, loops and high acceleration launches. curring problem with these paper tube Art Reiners designed the Beachey model fuselages. After awhile the paper tubes featured in this issue and the Baby Weight of the typical finished JAVE­ weaken. Bill’s latest paper motor tube Boomer which was in our Sept. ‘72 LIN, with a 2 servo radio is approxi­ problem is flexing at the base of the issue. These, and the Pup, a low wing mately 32 oz. This gives a wing loading wing pylon. This flexing, needless to say, sport model, will be the first kits intro­ of 7.5 oz./sq. ft. Tests have shown that changes all the angular relationships of duced. Actually, it will be four in all as for high wind slope flying, 8 oz. of everything. Under static conditions this the Beachey will be available in two weight can be added to the C.G. to flexing ability is not readily apparent. If sizes, for .020 and .049 power. bring the wing loading up to 10 oz./sq. you are using paper tubes in Wakefield Future antique models include the ft. and getting erratic power patterns, check 1930 Longster III and the 1909 Blériot The link between the servo and the for tube flexing. Bill suggests covering X I, also R/C versions of the Boomer control surfaces is a flexible steel wire the tube with a layer of 1/32 inch and the Beachey. inside a nylon tube bearing. This gives * * * a low friction linkage, eliminating the balsa, fiberglass over silk, or similar In our Classifieds this month, you’ll annoying trim problems associated with techniques to prevent this flexing. Bill, notice an ad by Ralph Beck for 2 inch the plastic push rods. however, has changed to aluminum scale drawings o f the Curtiss Jenny. The JAVELIN is priced at $49.50. tubes. There are 3 sheets of drawings, each If not available at your local dealer, THE "W HY ARE WE IG NO RING GAS 33-1/2 by 72 inches, and in our opinion, order direct from J.P. Models, 26557 POWERED MODELS” DEPARTMENT they are the most complete set of highly Mazur Dr., Rancho Palos Verdes, Ca. Gee Whiz, gang. Sure didn’t mean detailed scale information we have seen 90274. · to leave out all o f the gas powered

MAY 1974 69 No. 12731 QUASOAR II $4.50 FULL-SIZE PLANS Beautiful 12 ft. span, V-tail, R/C soarer. NEW!! Spoilers and air brakes. By Niel Liptak. SERVICE STICK 'EM PATTERNS (with instructions) No. 12732 PULL-Q $2.00 Easily built A/1 Nordic. Span 56-1/2". Complete sets of pressure sensitive patterns Proven contest winner. By Jean Andrews. provide "printed wood". . . on your stock . . No. 12711 CURTISS-WRIGHT JR. $3.50 No. 1273-OT INTERCEPTER $2.00 for selected MODEL BUILDER plans. Press Two inch R/C scale model of famous An .020 Replica of popular Goldberg de­ all patterns for ribs, bulkheads, tips, etc., on pusher light plane. By Ralph Fidance. sign, kitted by Comet. By Wayne Cain. proper thickness sheet balsa or plywood, and cut 'em out! No tracing, no transferring, No. 5741 LINCOLN BEACHEY $2.00 No. 11731 BIG JOHN the FIRST $5.00 no plans tearing, no inaccuracies. Just like Semi-scale .020 sport free flight of well Modified prototype of editor's notorious making up your own kit with printed wood. known early-bird stunter. By Art Reiners. monster R/C biplane. By Bill Northrop. "Stick 'em Pattern" numbers correspond to No. 11732 BUMBLE BEE $2.00 plan numbers. Order with plans and they'll No. 574-0.T. The T-D COUPE $3.50 C/L Combat ship for .35 power. Features be mailed together . . 3rd Class. Add 504 Classic high wing 1936 'C' cabin gas job. foam wing construction. By Phil Cartier. per set to mail patterns 1st Class. Span 64". Redrawn by Phil Bernhardt. No. 1173-OT TRENTON TERROR $3.00 CALIFORNIA RESIDENTS ADD 6% TAX. Gas job from 1938 Flying Aces. Span 6'. No. 4741 GLENN'S "T" $5.50 Simple lines. Redrawn by Phil Bernhardt. No. 12711SP Curtiss-Wright Jr. $3.95 Graceful 12' T-tail R/C soarer. All wood No. 10731 SUPER DOUBLER $4.00 No. 574-O.T.SP T-D COUPE $2.95 framework. By Glenn Cunningham. Shoulder wing, pylon racerish sport R/C Watch this space for more patterns to come. NO. 4742 CESSNA AW $2.50 for .35 to .40 engines. By Brad Shepherd Jumbo scale rubber powered model of a No. 10732 SCALE EDO FLOATS $1.50 1928 classic. Span 48". By Jim Adams. Scale floats for Lanzo Puss Moth or your NEW!! No. 474-O.T. PACEMAKER $3.00 favorite ship - 22" long. By Hal Cover. J. L. Sadler's famous Class C low wing No. 1073-OT GOLDBERG ZIPPER $3.00 No. 6731 WACO YKS-6 53.50 gas model. Redrawn by Phil Bernhardt. Most famous of all OT gas models, ended Winner of 1972 Nationals F/F Scale Gas cabin era. Redrawn by Phil Bernhardt. No. 3741 OSPREY 1 S4.00 event. Span 33-1/4". By Bill Warner. Pretty R/C scale homebuilt flying boat. No. 9731 QUARTER MIDGET P-40 $3.00 No. 6732 DRAGGIN' FLY $3.50 Span 70", .40 engine. By Dave Ramsey. Easily built R/C model of famous fighter Lightweight R/C glider for thermal soar­ for racing, sport, stunt. By Jack Sheeks. ing. Wingspan 7 feet. By Duane Hyer. No. 3742 LITTLE GEM $2.50 Winning QM racer from Sig Doubler kit. No. 9732 FAIman7 $3.00 No. 673-OT ALBATROSS $3.75 By Austin Leftwich and Brad Shepherd. Small but potent power ship for .09 eng. Class C gas ship designed by George Simple, inexpensive. By Bob Stalick Reich. Redrawn by Phil Berhardt. No. 374-O.T. POWERHOUSE .020 $2.00 An .020 Replica of well known Sal Taibi No. 9733POU DUCIEL $1.50 No. 6733 HUNTINGTON H-12 $150 1938 gas model. By Gene Wallock. Cute little all-balsa semi-scale model of Rubber scale model of first US home­ famous homebuilt. CO2 . By Dan Walton. built. Span 19". By Walt Mooney. No. 2741 LITTLE TOOT 5450 Exact 2-1/2" R/C scale plans by designer No. 973-OT SPOOK 48 $3.00 No. 5732 WOODWIND $2.50 for homebuilt bipe. By George Meyer. Well-known gull wing design qualifies for A/2 glider with sturdy, warp-proof, all­ Antique Old Timers. By Snyder & Muir. sheet wing. Span 78". By John Krouse No. 2742 LI'L SNIP S1.75 No.8731 FOKKER D-VI $4.00 No. 5733 TEA KETTLE $150 Easily built 1/2A combat ship. Designed WW-I biplane fighter at 2 "= V scale for Twin-boom pusher for the Brown CO2 for W.A.M. competition. By Rich Lopez. R/C and .40 engines. By Philip C. Foster. engine. Span 15". By Daniel Walton. No. 274 OT PACER "C" $3.00 No.873-OT 1931 RUB8ER MODEL $225 Sal Taibi's famous 1941 Nats gas winner. Record setting 1931 fuselage rubber job. Price includes 3rd Class postage and reprint 60" span. Redrawn by Phil Bernhardt. Span 38". New plans by Phil Bernhardt. of building instructions (if any). Add 454 No. 1741 WATER STRIDER $5.00 No. 7731 L.I.A.H.O. $250 PER PLAN for 1st Class postage. Add 504 Low wing, single float R/C seaplane for Trike geared pusher R/C sport plane for for overseas orders (except APO's). .60 eng. Span 75". By Bob von Koňsky. Cox .049. Different! By Bob Janiger. Send self-addressed, stamped business size No. 1742 BRIAN'S BULLET $2.00 No. 7732 SQUARE CAT $2.50 envelope for free copy of complete plans list. Excellent competition free flight trainer Easy building profile carrier C/L for .36 CALIFORNIA RESIDENTS ADD 6% TAX. for Tee Dee .020. By Loren Williams. engines. No gimmicks. By John James. SEND TO: No. 174-OT EHLING ’37 GAS JOB $4.00 No. 773-OT LANZO 8' GAS MODEL $4.50 MODEL BUILDER PLANS SERVICE Frank Ehling's 8 ft. span 1937 gas model. Chet Lanzo's famous "Record Breaker." 1105 SPURGEON Still winningl Drawn by Phil Bernhardt. Two large plan sheets. By Phil Sernhardt. SANTA ANA, CALIFORNIA 92701 sheet balsa parts to any given model for your own model! Each pattern piece sets for previous construction projects building project for which we sell plans. will show the piece number and the for which full size plans are available. When we say complete, this means that proper grain direction. Further, you will Think of the convenience in building if a plane has 24 wing ribs all exactly find that the pressure sensitive paper Old Timers, such as Sadler’s Pacemaker alike, you’ll receive 24 wing rib patterns holds the surface grain together some­ or the Zipper, with all of those different . . . not just one. what, and can help prevent splitting. size ribs. Let’s take a f’r’instance . . . the Cur­ “Stick ’em Patterns” will: assure As the decision to provide “Stick ’em tiss Wright Junior in this issue. There accurate duplication of prototypes, al­ Patterns" was just made at press time, will be 12 pattern sheets, some for 3/32 low drawings to remain intact for fur­ we have only had time to process the balsa, some for 1/8 balsa, and some for ther use, free the model builder from Curtiss Wright Junior and T-D Coupe. various thicknesses of plywood. Using many tedious hours of pattern trans­ The C. W. Jr. Stick ’em Patterns, consis­ scissors, rough-cut the rib patterns out, ferring, allow personal selection of mat­ ting of 12 printed 8-1/2 x 11 pressure leaving about an 1/8 inch o f extra. Lay erials and economic use of scrap pieces, sensitive pattern sheets, costs $3.95 a set. the patterns on a sheet of 3/32 balsa and and provide the convenience of kitted (Lucky Californians must add 24 cents juggle them around for the most econo­ models to the scratch builder. sales tax!) The T-D Coupe set comes to mic use of the wood. Now, one by one, MODEL BUILDER, in cooperation $2.95. The identification number for remove a pattern, peel off the backing, with Windancer, will be offering “Stick patterns will be the same as for the plan, and press it into place on the wood. ’em Patterns” for all major model build­ plus the letters “SP." Order your plans When you've finished this operation, ing plans projects, as published in MB. and patterns at the same time and they’ll you’ll have a complete sheet of print- You can order the plans and the patterns be mailed together. Watch future Plans wood! Not only that, you will have at the same time, from the same source. Service ads for additional Stick ’em selected the quality of wood you want As time goes on, we will prepare pattern Patterns as they become available. ·

72 MODEL BUILDER ladge, used to hang the whole works from nails or pegs on the hobby room wall. CLASSIFIED ADS Non commercial: Rate is 25 cents per word with a minimum of S3.00 worth Swave: See Dee-boner. Commercial Rate is 40 cents per word with a minimum of $5.00 worth. No Tale-dragger: A witness to another per­ mail-order discount house ads knowingly accepted. sons simulaneous loss of airspeed, All ads are payable in advance and may be for any consecutive insertion period altitude and ideas. specified. Name and address free. Send ad and payment to; The MODEL BUILDER. Twitty: see "Conway” Classified Ads. 1105 Spurgeon. Santa Ana, California 92701 Under-Chamber; Bottom curve on wing SCALE PLANS. Big 30 x 42 Bluelines. All BACK ISSUES: Flying Aces, Air Trails, or a Thundermug. 1" = 1 foot. 3-Sheet sets: Douglas 0-25C, M .A.N., pulps, etc. List for SASE: Velio-City: Combined with “Terminal” YO-31A/O-31 B. YO-31C/Y10-43, 0-43A, A V IA T IO N M AGAZINES, 24248 Crenshaw to describe speed of a module in a 0-46A . Fokker D-17; $4.50 each. 2-Sheet Blvd., Torrance, Ca. 90505 (213) 325-3640 power dive. sets: Douglas 0-38, Davis D-1K; $3.00 each. "DO-IT-YOURSELF AERODESIGN" - General Western Meteor, 1 sheet; $1.50. Sailplanes, FF, HLG, R/C Sport, Charts, Weasel: One who flys module and zonks Mailed folded and postpaid. PETER W. instructions - S4.95. without witness. WESTBURG, 834 Seventh St., No. 6. Eric Lister, 953 Klockner Rd., Trenton, Santa Monica, California 90403 Zonk: What happens when module, New Jersey 08619 pilot, and other parts fail to agree W ANTED: Major Models kits; Mirage, Saul- FOR FUNI Miniature auto racing by with the ground. nier, and Eindecker. Also ignition engines. radio control. Catalog and gift certificate, The above glossary of terms was Will buy or swap for R/C or U/C engines. $1.00 FREDZ - MODEL RACING SUPPLY. lifted and abridged from DJ’s Electric Frank Schwartz, 2400 West End Ave., 184 Success Ave., Bridgeport, Conn 06610 Nashville, Tenn. 37203 Airplane Club Newsletter. Together with Model airplane plans. Peanut, rubber, CO2 , them, I sincerely hope that this has Curtiss "Jenny" drawings, 2"=1'-0", 87.23" gas. Free list. Send self addressed, stamped proven educational and informative to wingspan, .60 engine, 3 sheets 33-1/2" by envelope to: Modernistic Models. Box 6932 72". Highly detailed scale drawings with Burbank, California 91510. those of you who stuck it out to the OX-5 engine details. Complete set $10.00 end. And speaking of the end - - this is Postpaid. Send SASE for miniature "Jenny” Model Airplane Plans. Peanut Scale: Spezio it for this month. More to come in drawing set. Ralph A. Beck, Route 2, Sport, "Vega 35". 754 each. Send S.A.S.E. June . . . I hope you’ll tune us in. Beloit, Wise. 53511. for list. Kirk Lindsey, 137 North First Ave., Oakdale, California 95361 (For any further explanation of a- SEEKING JOB in hobby and craft shop. bove glossary, D O N 'T contact this mag­ Excellent in both fields. Prefer South Cent­ STOP WATCHES; 1/10 sec., 15 minutes azine! Write directly to Whatzizname, ral and Southwest areas. Willing to relocate. lapsed time, 30 sec. large hand. Guaranteed. $33.00. Custom Hobbies, 2408 E. Platte 1120 Shady Lane, Albany, Oregon Salary open. L. Mac Arthur, 2808 Ave. "L ", Council Bluffs, Iowa 51505. (712) 323-0421. Ave., Colorado Springs, Colo. 80909 97321. wen).

STOP PRESS! featuring from time to time Most of mean that the handling and mailingcosts With or without the time handicap, them are produced by Dr. Will Naka- involved in shipping sheet balsa has Dave Linstrum (strange . . . that name shima, and in the true tradition of the been cleverly (surreptitiously?) avoided. seems vaguely familiar . . . ), Jackson­ political artist/lampooner, he takes neat Instead, we will be offering a complete ville, Florida, was first to come up with little pot shots at some of the idiosync­ set of pressure sensitive patterns for all the correct answer to A p ril’s Mystery rasies of our modeling buddies. If you Model; Claude McCullough’s "Twinster" have got some pet “they’ll do it every Index to Advertisers published in the June 1947 issue o f Air time” thoughts that you’d like to see Trails. (Remember that great magazine?) illustrated in pen and ink, drop us a Bridi Hobby Enterprises ...... 61 Several Californians thought it was note and we’ll pass it on to Will. Cal Aero-Model ...... 66 Frank Cummings' twin fuseiaged Wake­ D. T. Cerutti Design...... 69 THINGS TO DO field which he was flying in the "50s. in Cloudbuster V e n tu re ...... The 3rd Annual Frank Dallaire Old- 63, 64, 66 fact, Fudo Takagi quite accidentally C raft-A ir...... timer’s Contest, sponsored by the Indian Dumas Products, Inc...... 2nd Cover came across a picture o f Frank and his City R/C Club, Riverview, Michigan, will Flyline Models ...... twin which we 'll publish as soon as the take place on October 6, 1974. A little W. C. H a n n a n ...... 64 space is available. · ahead of time to announce, but we Heath Company ...... 6th Cover were particularly interested (and John Hobby C a p ita l...... Workbench . . . Continued from page 4 ...... 51 “ Daddy Warbucks” Pond ought to be Hobbypoxy Products...... Hobie Model Company .... 5th Cover modeling, particularly scale. He is a pro­ too) in the specs for entries. Any Class HRE, Inc...... lific and neat builder and a competent C Pre-War (WW II, that is) free flight Kavan Model Aircraft, Inc. . . 4th Cover flyer. He is also a very active one, and airplane is accepted. Engine size to be K & B Mfg...... as such, is very seldom missing when an .40 cu. in. only, glow plug or ignition, Kraft Systems ...... 3rd Cover eastern R/C contest takes place. For and 11x6 props are to be used on all MACS ' 7 4 ...... 2 this reason he will make an excellent engines. That takes care of the (unfor­ Marlow Engineering...... 57 representative for MODEL BUILDER in tunate) power race that’s been going Micro Models ...... 68 ...... 69 the business of promotion and adver­ on in O.T.’s . . . in one fell swoop! Midwest Model Supply .... tising. You will see his name on the Walt Mooney (Peanuts) ...... 70 Contest specs also require 3 con­ ...... 70 masthead as Eastern Advertising Repre­ Sid Morgan (Vintage Plans) . trols; engine, rudder, and elevator. Call Model Rectifier Corp. (MRC) . 8th Cover sentative, where he joins with Western Bill Darin (313) 676-1477 for more in­ M & S Ltd...... Rep. Bob Upton. We’re happy to have formation. Peck-Polymers ...... 68 him aboard. Next time you see Walt, * * * Royal Products Corp...... 7th Cover say "Hello there, MODEL B UILD ER ’S STICK ’EM PATTERNS Sig Mfg. Co...... 2 Eastern Advertising Representative!” Al­ Unless a better name comes along, Sonic-Tronics Inc...... so say hello to that very cute brunette this may be the title of a new service Jack Stafford M o d e ls...... 56 with him. Her name is Rose, and her that MODEL BUILDER will be offering Sterling Models, Inc...... 51, 52, 53 ...... 65 last name will be Moucha (Say "Moka") to the model builder. (See how we came Su-Pr-Line Products...... Tatone Products...... 62 as of July 20, 1974! up with that clever title for the mag?) Victor Model Products...... CARTOONS "Stick ’em Patterns” is a sneaky way Vortex Model Engineering ...... 60 We hope you have noticed the series of offering partial kits for plans pub­ Williams B rothers...... 67 of one-shot cartoons that we have been lished in the magazine. By sneaky, we

MAY 1974 71 Buy and build a Heathkit “405” 8-Channel System and The thin-profile lightweight aluminum cases are cov­ you get the same handcrafted quality that goes into your ered in blue vinyl with no exposed fastenings to get in models — plus you save money two ways. First, there’s the way. Both transmitters have a two-position switch the traditionally low Heathkit price, second, we knock for landing gear, finger adjust tabs for auxiliary chan­ another $34.70 off the individual component prices when nels; trainer link jacks and “ buddy button” ; external v you order a complete system. You end up charging jack for simultaneous charging of receiver with an 8-channel system for what you transmitter and receiver batteries; eight range controls would normally expect to pay for a for adjusting servo travel. Our GDA-405-2 eight-channel n - quality 6-channel rig! receiver weighs just 2.5 oz. yet includes a new built-in connector block. Heathkit “405" Systems put 8 channels—in either single Choose either single or dual-stick control in 27, 53 and or dual-stick format — in a 72 MHz —with adjacent channels at no extra cost. To package no bigger than con­ qualify for systems discount select either Single Stick ventional full-house trans­ (GDA-405-S) or Dual Stick (GDA-405-D) Transmitter with mitters. An exclusive 1C en­ your Heathkit 8-Channel System. Includes GDA-405-2 coder makes it possible. Receiver, GDA-405-3 Battery Pack, and any four servos And there's a Heath-de­ (either GDA-405-44 Miniature or GDA-505-44 Sub-Mini). signed 1C decoder in the Heathkit 8-Channel Systems include all batteries. matching receivers to trim Complete Single Stick System ...... $269.95* size and weight there too! Dual Stick S ystem ...... $249.95*

Send for your F R E E '74 Heathkit Catalog - world’s largest selection of electronic kits

HEATHKIT ELECTRONIC CENTERS Units of Schlumberger Products Corporation HEATH COMPANY, Dept. 238-5 Schlumberger Retail prices slightly higher. Benton Harbor, Michigan 49022 ARIZ.: Phoenix; CALIF.: Anaheim, El Cerrito. Los Angeles. Pomona. Redwood City. San Diego (La □ Please send FREE Heathkit Catalog. Mesa). Woodland Hills; COLO Denver; CONN Hartford (Avon); FLA : Miami (Hialeah). Tampa: □ Please send model(s)______GA.: Atlanta; ILL Chicago. Downers Grove; IND Indianapolis; KANSAS: Kansas City (Mission); KY Enclosed is S_ . plus shipping. Louisville; LA.: New Orleans (Kenner); MD.: Balti­ more. Rockville; MASS.: Boston (Wellesley); MICH Name______Detroit; MINN.: Minneapolis (Hopkins); MO.. St. Louis; NEB : Omaha; N.J.: Fair Lawn; N Y.: Buffalo Address- (Amherst). New York City. Jericho. L I . Rochester. White Plains; OHIO: Cincinnati (Woodlawn), Cleve­ City____ _State_ _Zip_ land. Columbus; PA Philadelphia. Pittsburgh; R.I.: Providence (Warwick); TEXAS: Dallas. Houston; •Mail order prices; F.O.B. factory. RC-106 WASH.: Seattle; WIS.: Milwaukee Above, you see my shot al R/C sailplanes Construction: Tail Cone I have put a tremendous amount of time, thought Wing 6 layers pre-impregnated epoxy fiberglass and tooling into the Hobie Hawk, trying to use the Top Skin—1 /3 2 " plywood formed under 150 P.S.I at 300 degrees right materials in the right places to give the high­ Inner Core—High-density foam Tail Piece est strength-to-weight ratio possible. It's not inde­ Bottom Skin—1 /6 4 " plywood Injection-molded A.B.S structible. though surprisingly strong., „ ) Root Rib—Iniection-molded A.B.S. find the design and construction unique Leading Edge and Wing Tips—Pine Hobie Model Company more interesting are the Hobie Hawk's flight < Stabilizer and Rudder Department 100 acteristics. Elliptical dihedral gives you the Same as wings except both top and bottom skins 33081 Calle Perfecto 1 /6 4 " plywood San Juan Capistrano. California 92675 ,°h,n μ π η Γ Ι ' ^ κ 0 ' dlhedral and Polyhedral. A Division of Coast Catamaran Corp. I n 1 ber a,r ,01' gives high lift and p Fuselage soaring '°r exceilen< thermal and i Nose Cone—Rotationally molded of cross-linked See your dealer first. If not available, write us direct. polyethylene (a tough resilient material) Dealer Inquiries Invited M r T liis p u m p ís realty "Prime"

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MRC/MK Fuel Pump ur dealers... $10.95 If everyone made a fuel pump that could meet the needs of modelers for a reliable, long-life delivery system there would be no need for MRC-MK’s new self priming fueling device. But there is a need and this pump meets your demands. Features include a geared 4 to 1 pump drive to provide power to lift fuel from a gallon can’s bottom, integral 6 volt power supply— nickle cadmiums or standard pencells may be used. A safety lock on the switch prevents accidental turn-on. The switch provides reverse feature for filling or emptying tanks at an excellent speed. Heavy duty motor, high efficiency pump unit, rugged plastic case with mounting lips for attachment to typical gallon can are all included. Simple modular construction for ease of servicing. Of course, replacement parts are available. Make no mistake, this rugged, reliable and long lasting fuel pump will meet your needs where others fail, and will do so for season-on-season of active flying. MRC-MK’s fuel pump is really ‘‘prime’’ ! Model Rectifier Corporation · 2500 Woodbridge Avenue · Edison, New Jersey 08817 . . . a step up in power and a step up in quality. Step up to the new Merco Mark IV.

Externally, it may not look much different, but its precision innerworkings are now capable of delivering power and perhaps one steo lh Γ P " , , c iteP ahead of its timp S p p it more power than ever before. Major changes in now at your local dealer! tS T me' bee porting, timing, fuel intake and the compression ratio make it possible. According to Peter Chinn (Decem­ MERCO ENGINES FOR 1 9 7 4 ber 1973 issue of Model Airplane News), the power .61 R/C MK IV ...... S72.95 curve for this new .61 indicates "... a good peak .61 STUNT MK I V ...... 59.95 output of 1.2 BHP at 14,000 RPM." He goes on to .61 R/C MARINE NIK IV . . . ! ’ ’ ...... 79.95 say that "...just over 1.0 BHP was still available .49 R/C BLACK STREAK . . .. ! . ! ...... 66.95 when the engine was loaded down to as low as 10,000 .49 STUNT BLACK STREAK .... ” ! ...... 54.95 RPM." Ίη short, this new series Merco has power to .49 R/C MARINE BLACK STREAK !!...... 74.95 spare and yet, it still maintains the utmost in .35 R/C BLACK STREA K...... ϋ ϋ ...... 39.95 reliability and economy. Its carburetor provides a .35 STUNT BLACK ST REA K ...... !!!!!!!! 29.95 smooth idle and offers extremely positive midrange .35 R/C MARINE BLACK ST REA K ...... 49.95 response. Its new heavy duty crankshaft enhances .29 R/C BLACK STREAK...... 39.95 durability, but not at the expense of unnecessary .29 STUNT BLACK ST REA K ...... 29.95 weight for the Mark IV weighs in at only 13.7 ounces. .29 R/C MARINE BLACK ST REA K ...... 49.95

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