OCTOBER 1972 65 cents volume 2, number 12 CARL GOLDBERG MODELS THAT G R A N G E R 4 2 The Versatile Almost· ARE REALLY Ready-To-Fly Full. Model. $1995 GREAT TO FLY! SKYLANE 62 ® © Takes Single To 4 Channel Proportional Radio. Molded Fuselage...One Piece Molded Wing, Stabilizer and Vertical Semi-Scale Beauty in Fin. Also Free Flight. Span 42". Weight 26 oz. For .049— .10 Engines. a Great Flying Model!

Tough Roomy Cabin and Front End. For 2 1 ^ 4 Channel Proportional Steerable Nose Gear. Span 62". Weight 4>/2-5 Lbs. . For 35 Tn .45 Engines. 10 FEATURES: Now With 1-Piece Full-Length Sides. Takes 2 to 4 Channel Pro­ portional. Span 56". Weight 3 Vi-4 tø lbs. For _15-.19-.35 Engines. • See-through cabin, with die-cut plywood cabin sides FEATURES: • Shaped leading edges plus sheeting • Semi-symmetrical wing section • Coil-sprung nose gear. . . • Cleanly die-cut parts that fit formed main gear • Clark Y wing section, hardwood struts • Shaped and notched leading and J R Ο κ η Α Μ ί trailing edges For Single or 2 Channel, Pulse or Digital. Span 37" • Steerable nose gear, formed main gear • Cleanly die-cut ribs, fuse sides, Weight 18 oz. For .049 formers, etc. • New simple "Symmet-TRU” Engines. . $8.95 1/2A SKYLANE $9.95 wing construction For Single or 2 Channel, Pulse or Digital Span 4 2 ". Weight 22 oz. For .049 To • 10 Engines S k o e s t i m q $2995 The Goodyearfinndvpar RarprRacer With EnoughFnmioh ^ Area and Stability So You Can Fly It! For 4 Channel Proportional. Span 54"; Area 540 sq. in.; Weight 4tø-5 lbs. For .19-.40 Engines. FEATURES: • Shaped leading edges plus sheeting • Symmet-TRU wing construction • Full-length sides, sheeted trailing -I edges LOOK WHAT A MODELER SAYS' which , have just com· • Cleanly die-cut ribs, formers, etc. “ Fnri0Sed is a photo of a model of your SKYLWj that ( have built in 25 • Formed spring aluminum landing Dieted I enjoyed building this plane, itis t . men hying some R/C mode s gear ? e a rs Several months ago I observed a group of men jiy ^ an R/C • Semi-symmetrical wing section. and this rekindled my interest m mo P ^ gr some investigation l settled model, I was dubious which model to bui · d(fierent from anything that I THE FLYING nn voiir kit and I was not disappointed. tnupther very easily. The plans FALCONS K il te"«* »"11 «actl* *;» were complete, le« mrtfiní to ^ e a » 'k . . t o » » mot«., a«»* OS40. More Falcons have been built and flown in the ! ώ ν . - * ,ο» I - "»» past 10 years than any much I appreciate this kit and I hope other R/C. For values and features in a functional, rugged airplane, your best bet is a Falcon. to be able to build all of your planes AVAILABLE IN CANADA Every design element engineered for simplicity and fast-building. eventually. Again thanks for such a FALCON 56 $19.95 Medium-Size Trainer. Single To 4 Channel ^ine ^ Arnold B. lohnson Proportional. Span 56". For .15-.19-.35 Engines. Troutville, Virginia SR. FALCON $36.95 Standard Big Trainer. 4 Channel Propor­ Γ GoldbergM1»™"" tional. Span 69". For .35 To .60 Engines. I I .m ,o,deChiCag0' MI· 60608 JUNIOR FALCON $7.95 Small Trainer. Single or 2 Channel. ■ «·"»you I *nd Rad,° Control Definitions/ 0 EquiPm*°t. Span 37". For .049 Engines. (75t 35« Ο«' item I * a m e _ CARL GOLDBERG MODELS imT ADDRESS« 2546 WEST CERMAK ROAD · CHICAGO CITY. - ili-INOIS 60608 .STATE . -ZIP. RADIO CONTROL-SEMI-SCALE S U P E R . O ΐ Ή Χ Γ IS HERE! THE PLANE THAT THRILLED MILLIONS- A.R.F. INJECTION MOLDED FOAM - FANTASTICALLY AEROBATIC ...brush up in Flyology with the’’professor of Stunt pilots” Airplane ^

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The MODEL BUILDER 1 Hey Man! “Fast Richard” and all the Other Cats in “Snyder Swamp" w ill tell You... NO ONE SHOULD BE WITHOUT... The JUILDER 12552 DEL REY DRIVE SANTA ANA CALIFORNIA 92705 The MODEL BUILDER is published monthly. Regular sub­ scription rates are $6.50 for one year and $11.50 for two years. Add $1.50 for subscriptions outside of U.S. and Canada. Please enclose check or money order. Do not send cash. N a m e ------

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State One year at $6.50 Begin with Issue Two years at $11.50

The MODEL BUILDER 2 The OCTOBER

1972

volume 2, number 12

STAFF CONTENTS

EDITOR FEATURES Win, C. Northrop, )r. WORKBENCH...... - ...... - ...... 4 GENERAL MANAGER Bill Northrop Anilj Northrop FREE F L IG H T ...... 12 E D IT O R IA L ASSISTANT Mel Schmidt Lc Gray RADIO CONTROL...... 16 SECRETARY Bill Northrop Bobbie Tyler CONTROL L I N E ...... 22 CIRCULATION MANAGER Dick Mathis Bill Phillips SCALE F / F ...... - ...... 26 CONTRIBUTORS Fernando Ramos

Bill Hannan FAA C O D E ...... 30

Ben Hogensen R/C SOARING - - - ...... 34 Dick Mathis Le G ra y Walt Mooney P Y LO N /4 ...... - ...... - ...... 38 Fernando Ramos F re d Reese P Y LO N ...... 39 Fred Reese Chuck Smith Mel Schmidt ELECTRIC AIRPLANES ...... - ...... - ...... 42 Chuck Smith Roland Boucher

ADVERTISING REPRESENTATIVES R/C C A R S ...... - - ...... - - ...... 44 EAST: Chuck Gill. 835 Gilbride Road, D ean B ro w n Martinsville. N.J. 08836 <2011 469 308? CONSTRUCTION WEST Bob Upton, 20626 Clarendon Ave. Woodland Hills, California 91364 STEPI IENS-AKRO, Brad Shepherd ...... 8 <2131 883 7681 M INI-FAI, L o re n Williams ...... _ ...... - ...... 20 B STOUT TROPHY WINNER, a i Rohrbaugh...... 30 Subscriptions $6.50 per year, $11.50 two years. Single copies 65 cents. Add $1 50 for BELLANCA PEANUT, D o n B u t m a n ...... 31 postage per year outside of U.S. and Canada (Except APQ) Copyright 1972 The MODEL BUILDER. All rights reserved Reproductions without per mission prohibited. Cover: Bob Karlsson, Wilmington, Delaware, placed 11th at the 1972 Nats with Published Monthly by The MODEL BUILD this 1-3/4” scale F4U-1 Corsair. Ship weighs 14 1/2 lbs., span is 71” , O.S. Max .80 power, 14 x 6 Top Flite prop, Orbit radio. A machined E R Magazine, 12552 Del Rey Dr., Santa Ana. steel shaft extension and spinner add 12 oz. of much needed weight to the Cahf. 92705 Phone <7141 544 1321 nose. Flaps and retracts also operate. Fuselage is a balsa box with carved Second Class postage paid at Santa Ana, Ca, foam planks covered in 1/16 sheet. Ship threw spinner weight and crashed at the Nats, but is now repai ed and lying again. Photo by Bill Northrop

The MODEL BUILDER 3 "Darn right / believe in the Builder-Of- The-Modei rule. I let my old man build this H.L.G. for me, and look what happened the first time / went for an o fficia l!"

John S tu b b le fie ld , age 3, H ouston, Texas

• f r o m B i l å ňlor+hrop* w o r k b e n c h · · ·

• It is with a great deal of pride and sat­ isfaction that we announce the official recognition ol The MODLI. BUILDER as a magazine to be reckoned with in the model hobby publishing business. In case you hadn’t noticed, and this is very possible, we have been named to that exclusive clique of "lim ited circu­ lation” publications by another member of the clique, which, by the way, is truly limited, in that it deals with only one phase of our great hobby. Because of this limited subject mat­ ter, and also because ot its apparent inability to find cover material which pertains directly to the hobby, we had discontinued regular reading o f this "model” magazine several years ago. However, in the last few days we have been receiving phone calls and letters from modeling friends who were quite disturbed about some statements by the editor, in the October issue of this magazine, pertaining to The MODEL "The day shift at Lockheed." Almost any time of the day, or night, this was the scene in the BUILDER. AMA hangar at Glenview Naval Air Station, north of Chicago, Illinois, during the Nationals.

MB's editor in some mighty good company; LCDR Al Geimer in whites, "Happy 5th Anniversary," somewhere over Texas. En route to the and CDR Bob Needham. They were THE NAVY at Glenview. Nats, aboard a Navy DC 6, Alex and Marlene Chisolm celebrated.

4 The MODEL BUILDER "We had some rain..." Fourth place C finalist Norm Page appeared to " . . . and we had some sun."Deputy chief judge Bob Upton checks up be used to such things. Note xm itter "baggie." It really poured down! on judges Watkins. Lane, and Sitko. Jim Whitley calls for Steve Buck.

Curious to see exactly what it was any more space in this or future issues all aboul, we attempted to buy a copy, for the purpose of continuing this “ lim­ which turned out to be rather difficult ited interest” debate. since many shops in the area had discon­ * * * tinued carrying the publication. We On page 55 of this issue you will finally located a copy and actually were find a copy o f the “ Model Aircraft quite pleased with what we found, as Operating Standards,” an advisory cir­ mentioned above . . . Incidentally, cular just released by the Department MB’s General Manager took one look of Transportation - Federal Aviation at the cover and immediately put her­ Administration. self on a strict diet. John Worth, Executive Director o f Oh . . . just one more thing. Though AMA makes the following comment in we appreciate the publicity and are no connection with this circular, "Please doubt expected to continue interpubli­ keep in mind that [A M A | is not en­ cation editorializing in the future, we dorsing the circular. There is much in feel sure that modelers are more inter­ it we don’t like and hope to change ested in reading about the hobby, all when it is reviewed. But our job right "Sorta looks like that there Statue of Libertine, phases of it, and therefore will not take now is to make everyone aware of what don't he, Maude?"

Officials and helpers assembling the Contestant Kits at AM A Head "Chief Cook and Bottle Washer," Kemp Bunting, checks over the quarters the night before registration started. official's lunches while Hank Waechter keeps tabs on Ready Boxes.

fc Hpre official Walt r-oroes ana No one that helped erect or remove the snow fencing w ill soon forget Th.s was a real Do-it-yourself jtch in for the big cleanup. it! Navy was truly amazed at the excellent civilian hard labor forces. Class B winner Ellis Newkirk (foreground) piten 5 The MODEL BUILDER Famous old-time modeler, Bert Pond, holding a famous old-time Here are Bert's medals, earned at the 1923 and 1924 "Congress” and model. These A-frame twin-pushers were the backbone of early F/F. "Convention" of National Aeronautics, St. Louis and Dayton. is in it, and to promote trying to live selves to prevent irresponsible govern­ with it." ment action from interfering seriously John goes on to point out that the with our activities. FAA is concerned any lime we fly more PLUG ’EM UP than 400 above the ground. They’re A lot of noise has been, is being, not saying we can’t go higher, but they’d and w ill be (end o f tense lesson) made like us to contact the nearest FAA about noise, in relation to the sounds tower or representative whenever we being emmitted by model engines. As do. Experiences to date have shown time goes on, and fields are lost, model­ that FAA people are pleased to get the ers are becoming more and more aware info and have not made any attempt to o f the need for mufflers, whether some­ lim it or control modeling activities. As one orders them or not. John points out, “ . . . the FAA circular Fortunately, engine manufacturersare is a means with which we can help our­ finally beginning to realize that if they

"Good Grief, Charlie, is that a Viking with a The new Williams Bros, spinner is designed for electric starter operation, in addition to being H olland H ornet? W ho is it? See page 12. unmarred by screws or holes on the outside surface. Available in many sizes and colors.

The Old-Timer event drew lots of spectators. Charles Zutell, of Lee Webster, Manchester, Tenn., launches his New Ruler 168 Kenosha, Wis., releases his Super Cyclone powered Bombshell. This ship is currently available in kit form.

6 The MODEL BUILDER Ralph and Jean Brooke are justifiably proud of son Steve, who flew "Get your big fat elbow out of the way. Clemens!” Many photograph­ his Kaos (Pro-Line, HP 60, Superpoxy) to 1st in Class A and Best Jnr. ers drew a bead on Bob Karlsson's Corsair. don’t make it easy for modelers to quiet down their engines, there won’t be modelers to buy engines. The thing that many people seem to forget, ignore, or are total'y unaware of, is the fact that excessive noise damages hearing, not only on a one shot basis, but also accumu­ latively. If you’re in an area where mufflers are not yet required, or if you’re in­ volved in Formula I racing, there’s no­ thing you can do about the noise emis­ sion, but there’s something you can do at the receiving end of the noise. Frank Schwartz, Nashville, Tcnnesee says,”

“ Best thing I ’ve found arc the sporting good stores shooter’s earplugs. No bigger "Ach Himmel, Fritz! A in't you undershtooden das uppensidedowner zoomen ist VERBOTEN! than the old fashioned swimming ear­ Or maybe you ben vorgetten das veels ist vrom der BOTTOM hungen , . . jo ik!" plugs, they are made of very soft rubber and contain a tiny cylinder which has cut o ff the noise peaks and only let the Miniature (Tethered) Racing Car Asso­ some kind of sensitive piston which closes low intensity sounds come through. Bob ciation Newsletter edited by Mrs. Martie on noise peaks. You can stand behind Reuther and our bunch who ran pylon Fairabend, 53166 Franklin Dr., Utica, all four pylon race planes in one heat racing at the Nats used them all the time Mich. 48087, it was reported that a and they don’t even bother you . . . more and they saved the day. Anyone who company in Denver, Colorado, is interest­ amazing than that it is possible to carry wants more information can contactme.” ed in knowing how many people would on a conversation with someone else You can catch Frank at 2400 West be interested in obtaining 14 x 32 spark using the same plugs at that very time End Ave., Nashville, Tenn. 37203. These plugs. in a perfectly normal voice . . . those plugs might be a good item for the O f course, the majority of tethered poor guys without them are screaming at better hobby shops to stock. race car operators use ignition engines, each other over the din and still don’t ANOTHER KINDA PLUG but when you add to this the growing get heard. Apparently these little marvels In a recent issue of the American Continued on page 53

Tatone engine and D-T TICK OFF timers are back, with improve­ Harley Michaelis' "Spirit of Freedom" sailplane which is being partial ments. The FLOOD OFF engine timer will be along in 1973. kitted by Hartman Fiberglass.

The MODEL BUILDER 7 8 FULL SIZE PLANS AVAILABLE - SEE PAGE 64 The MODEL BUILDER STEPHENS AKRO By Brad Shepherd . . . .A real classy scale, sport, or pattern ship, using an economical .35 or .40 engine. Construction is all balsa and ply . . . conventional. • Tlu· beginning of this very satisfying and many see success for this fine little would like to say that it is simple to project goes back to the May 1968 issue airplane.” As you who keep up with full build, has the looks of the full size of the then popular “ Sport Flying” mag­ scale flying know, Marge ‘Grandma’ aircraft, and is about 2 I /8 inch stand-off azine. Under the heading o f “ Sport Ritchie went to her rest while practicing Scale. It won’t quite do a vertical 4 FlyingCountry Store” , there was a short at an airport in Orange, California while point roll with the .35 in it, so I'm commentary about a new aircraft, w rit­ preparing for the Championships. planning to put a .40 under the cowl. ten by Gerald T. von Aspe. I quote, Directly under the commentary by This may sound a little prejudiced, "Attention home builders, plans for the Mr. von Aspe there was a tiny partial but this project has been a real "pleascr” STEPHENSAKRO midwing monoplane 3 view of this airplane. Being a mid­ from the time I drew up the plans Till designed specifically for competition wing “ nut” , it struck me as a good it went in the air on the test flight, so aerobatics will soon be available. Aero­ project with the exception of the front if your building appetite is whetted, batic aviatrix Margaret Ritchie will enter end: I just couldn't get fired up over start fuselage construction by laying out her STEPHENSAKRO in the 5th Bi­ it. One o f my RC buddies, Leon Folse, the basic sides on 3/32 inch sheet. Basic ennial World Acrobatic Championships and I, did some quick calculations from outline is all straight lines and can be at Magdeburg, East Germany, this year, the tiny drawing and that’s as far as the laid out with a yard stick or straight­ project got for 4 years. edge. Draw thrust line first (ball point Getting a little “burned out” de­ works good) then measure from this to signing quarter midgets, I looked at the establish outline. Use the lines inside top STEPHENSAKRO again and realizing and bottom sheeting, also lines inside that Sig now had 1/64 inch plywood top and bottom half inch front nose available, started putting things on pa­ blocks, to give you the basic outline. per. It looked good and had the possi­ Draw a straight line parallel to and bility of staying simple in construction. 3/16 inch above thrust line for wing cut The pictures tell the final story but I out, use root rib and draw wing section

The author/designer, all decked out in flying "'And awaaay we go!" The ship is a great combination for scale, sport, and aerobatic flying. togs, taxies the Akro to takeoff position.

The MODEL BUILDER 9 10 FULL SIZE PLANS AVAILABLE— SEE PAGE 64 The MODEL BUILDER Ship is balsa and ply construction throughout. Only a few weeks old, and a trophy winner already. Akro placed second in scale at Corpus Christi Even cheek cowls are formed of 1/64 plywood. Internats contest, was judged by well known scaler, Tom Dean. outline 3/32 inch wider than root rib meets fuselage side by epoxying 1/2 the benefit of those who may not know, to allow for 3/32 inch sheeting on wings. inch triangle strips to joint. Check notch the difference in balsa wood grains, “ C” Draw a line parallel to and 9/16 inch in the bottom for 1/8 inch ply landing or quarter grain (Sig stamps his as such) above thrust line for the stab location gear plate. Glue top 1/2 inch triangle has a “ mottled” effect and is very stiff, and make a 3/16 inch slot for this, or, pieces to side, and bottom 1/4 inch and will not bend without splitting the cut top o ff (see photo) and use blocks triangles. sheet. This keeps the surfaces straight to fair in the fuselage over the stab. Assemble fuselage over top view of and free from warping when finishing Mark angles of front and rear of turtle plans by inserting bulkheads B-l and B-2 the “ tail feathers" on your bird. If your deck piece. in place and glueing, pin to keep align­ friendly hobby dealer handles Sig balsa Cut the side to shape, making wing cut ment true while drying (I use 5 minute you can usually find some light “C” out and angle for turtle-deck (save turtle- epoxy for this job.) Glue either the grain in his bin. deck piece.) Use the side just cut out as ply crutch assembly, or firewall-only Due to the large elevators, I made up a pattern for the other side. arrangement in place. Epoxy the I/8 a long horn from K&S brass strip and The doublers are cut to shape from inch ply landing gear plate in place, then 3/32 inch music wire as a connector medium grade 1/8 inch balsa. Making the I/1 6 inch ply reinforcing plates to between the elevators. Holes are drilled these with the help of a straightedge and inside of fuselage. Place bent and drilled in the elevators and the connector/horn square at bulkhead locations insures a landing gear over ply plate, position it is epoxied in place. The brass strip straight and square fuselage. Glue the so it is square, drill holes in ply and shown is SILVER soldered to the MW doublers to the fuselage sides, D-3 first, install 4-40 blind nuts. connector. I used low temperature Sta- then D-2, using a scrap of 1/8 inch balsa Glue top rear sheeting in place and Brite for this job . . . it works well. to get agood fit where the B-l bulkhead bottom fuselage sheeting (with landing The tail wheel bracket/rudder drive will go. If you elect to use a one piece gear bolted in place), butting the 3/32 assembly is made from a Rand/Acc strip firewall instead of the crutch arrange­ inch sheeting against the aluminum LG aileron fitting. Solder a piece of K&S ment, draw a line on the inside o f each for a smooth flush fit on the bottom strip directly below the 90 degree bend D-2 doubler, square with the thrust line when finished. Engine, (whether using for rudder drive, slip a piece of 3/32 at the locations shown, to assure 0-0 crutch or radial mount system) should be inch brass tubing (the length of the Rand/ engine thrust when glueing firewall in fitted at this time, then the fuel lank. Ace fitting) over the I/1 6 inch collar on place. Use medium to light quarter grain the bottom, tightening it so there is no Gusset each side of firewall where it wood sheet for the tail surfaces. For Continued on page 46

Use of Handi-Wrap permits exact fit and glue-up of turtle deck. The almost completed bones. Cheek cowls are 1/64 ply wrapped around bulkheads shown here. Canopy is masked for protection.

The MODEL BUILDER Yup, that's who you saw on page 6; Carl Goldberg, making that trad- Bruce Mathews launches his TD .09 powered SonofaWitch Doctor, itional flight at every Nats. Looks easy, doesn't it? He placed 2nd in Junior FAI with this modified Sig kit. FREE FLIGHT-72 NATIONALS Our F/F Editor, Mel Schmidt, was unable to attend the Nats, but here are a few thousand words worth of pictures, mostly taken by George Bahrman.

• JUNIOR 1/2 AGAS: JUNIOR A GAS: JUNIOR B GAS: 1. F. Johnson, Ca. 1. G. Comp, Pa. 1. D. Lang, III. 2. B. Pailet, N.Y. 2. K. Bauer, Ca. 2. J. Mekina, Ohio 3. R. Faranda, N.Y. 3. M. Munger, Mich. 3. D. Mathews, Kans. SENIOR I/2A GAS: SENIOR A GAS: SENIOR B GAS: 1. C. Wiese, Mich. 1. G. Fortin, Mich. 1. W. Burgess, Jr., Ind 2. W. Burgess, Jr., Ind. 2. G. T urner, Tex. 2. G. T urner, Tex. 3. G. Watson, III. 2. L. McFarland, Tex. 3. M. Kummerow, III. OPEN 1/2 AGAS: 3. J. Jcrabck, Canada OPEN B GAS: 1. M. Heller, III. OPEN AGAS: 1. R. Kluiber, Ohio 2. R. Britzkc, N.Y. 1. H. Faranda, N.Y. 2. W. Burgess, Ind. 3. E. Wald, Minn. 2. A. DeMcllo, Canada 3. G. Schautz, Mich. 3. R. Johnson, Ca.

Wanna bet it's a Midi-Pearl? Dick and Mary Kay crank up the comp­ More proof that modeling is a fam ily affair. Joe Mekina and father any plane. Mathis and Peadon k it this well tested design. prepare TD .051 powered Starduster. Joe was 4th in A Gas.

12 The MODEL BUILDER Λ J i V

Jack McGillivray, Toronto, Canada, and his unusual "Folder." Outer National Free Flight Society's Executive Director, Hardy Broderson. panels open up when engine stops. Drawings in M ar/April MB. Quite a tail moment, wouldn't you say ... on Hardy's Xc design.

JUNIOR C GAS: 1. W. Schlarb, Jr., Ind. 2. D. Mathews, Kans. 3. S. Schmelzer, N.J. SENIOR C GAS: 1. M. Kummerow, III. 2. W. Burgess, Jr., Ind. 3. G. Turner, Tex. OPEN C GAS: 1. R. Bloomquisl, Iowa 2. G. Comp, Pa. 3. P. Kosmala, N.Y. JUNIOR FAI GAS: 1. W. Fribbis, N.Y. 2. D. Mathews, Kans. 3. W. Schlarb, Jr., Ind. SENIOR FAI GAS: 1. B. Webster, Ind. 2. R. Dunham II, Okla. 3. J. Naught, Tex.

Corky Wald, St. Paul, Minn., prays for a max. Chris Watters launches his winning Junior Wakefield model. He's from Battle Creek.

Andy De Mello, Toronto, and his 4th place Cameron Ackerly, Toronto, Canada, placed second in Open Wakefield. Open Nordic A/2.

The MODEL BUILDER 13 Open A/2 Nordic winner Peter A llnutt, Mississauga. Ontario, Canada, at front of processing line.

JUNIOR UNLIM. RUBBER: Susan Wiesenbach shows the boys how! 1. K. Bauer, Ca. 2. K. Gordey, III. 3. C. Watters, Mich. OPEN FAI GAS: SENIOR UNLIM. RUBBER: 1. B. Eggleston, Canada 1. R. Dunham 11, Okla. 2. D. Dock, Ind. 2. D. Wypych, Mich. 3. G. Vcrsaw, Mich. 3. P. Lewis, Mich. JUNIOR WAKEFIELD: OPEN UNLIM. RUBBER: 1. C. Watters, Mich. 1. P. Klintworih, Mich. 2. S. Matteson, Mich. 2. G. Perryman, Ga. 3. K. Gordey, III. 3. C. Solich, III. SENIOR WAKEFIELD: JNR./SNR. COUPE D ’HIVER: 1. P. Lewis, Mich. 1. M. Keuhne, Ohio 2. D. Wypych, Mich. 2. G. Simon, Mich. 3. R. Dunham, Okla. 3. R. MacCleery, Mich. OPEN WAKEFIELD: OPEN COUPE D'HIVER: 1. W. Sm it/, Wise. 1. G. Perryman, Ga. 2. C. Ackerly, Canada 2. B. Servaites, Ohio 3. I . McGillivray, Canada 3. J. Annis, Wise.

Jeff Nix, Smithtown. N.Y., a Senior.

It’s not too hard to tell that Warren Williams has made a slight modification to the fin Bill Chenault, Dallas, Tex; Midi-Pearl. on his Wakefield.

14 The MODEL BUILDER ■ο*. ' ^ **tř·

Bill Bennet looks a little strained as he helps son Andrew, who placed 4th in Junior Wakefield with "B illy Boy," from M.A.N. plans.

JUNIOR A/1 NORDIC: SENIOR H.L.G.: 1. G. Bennet, Mich. 1. L. McFarland, Tex. 2. J. Bayly, Ca. 2. R. Dunham II, Okla. 3. B. Pailet, N.Y. 3. M. Kummerow, III. JUNIOR A/2 NORDIC: OPEN H.L.G.: 1. M. Coates, Fla. 1. P. Kosmala, N.Y. 2. W. Friebis, N.Y. 2. D. McKinzie, Iowa 3. D. Stainbrook, Iowa 3. B. Servaites, Ohio SENIOR A/1-A/2 NORDIC: JUNIOR ROCKET POWER: 1. B. Webster, Tenn. 1. R. Lyons, III. 2. R. MacCIcery, Miss. 2. K. Burner, Ind. 3. J. Lorbiecki, Wise. 3. J. Bayly,Ca. OPEN A/1-A/2 NORDIC: SENIOR ROCKET POWER: 1. P. Allnutt, Canada 1. C. Wiese, Mich. 2. R. Watson, III. 2. P. Shailor, Mich. 3. R. Mattes, Mo. 3. J. Flaught,Tex. JUNIOR H.L.G.: OPEN ROCKET POWER: 1. J. Mekina, Ohio 1. W. Jenkins, Tenn. 2. S. Matteson, Mich. 2. M. Richardson, Ohio 3. T. Wilson Jr., Kans. 3. C. Sotich, III. ·

First in Junior Rocket, Bob Lyons, Γ Libertyville, III.

Andy De Mello and 1/2 Nog, A Gas. Lee Lieber, Moorestown, N.J. launches his Red Johnson, West Covina, California. Witch Doctor 800.

The MODEL BUILDER 15 I s r -

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Here’s the whole C Pattern Finals in a nutshell; the scores of each flyer for each round, the total of three judges. Best possible score is 480 points. R/C PATTERN AND SCALE -1972 NATS By Bill Northrop .... What better way to open a new feature department than a report on the biggest annual contest of all. We'll handle this chore in future issues, but hope to bring in many guest writers. • Every other year, the Nationals R/C certainly claim some “ firsts” and “ lasts.” ground. However, considering the total Expert Pattern Competition is NOT the For the first time since the two-site, number of back-to-back flights accom­ major clash of the big guns in this oldest four-line, back-to-back operation was plished over the past eight years, those of radio control events. The 1972 Nats inaugurated there were not one, but in the know felt we didn’t come any­ was a "N O T " year, as the “ Rilly Big two mid-airs, both occuring within a where near paying our debt to the law Shew” will be the R/C Masters Tourna­ short space of time, in the same qualify­ of averages. ment FAI Team Trials in Huntsville, ing round, and at the same site! Both Two other “ firsts” were cases of Alabama on September 22-24. accidents were also complete “ totals,” radio interference, which, though not Though an anti-climax from the above all four planes being pretty much re­ really the first in Nats history, were the point of view, the 1972 Nats R/C can duced to confetti before hitting the first to occur in the recent, rapidly

And now the front view of the back view we gave you last month! The top three in C Expert; "To the victor . . ." Ron Chidgey about to be II to r) Jim Whitley, 2nd; Ron Chidgey 1st (again!); and Don Coleman, 3rd. congratulated by MB’s General Manager.

16 The MODEL BUILDER To keep spectators informed, a new system was tried. Bonetti flies, Barry calls. (See below)

Ralph Brooke gives moral assistance to his son Harold Goldklank does a "4 Pernt Cuban 7-1/2 Steve, who certainly needs no help in flying. Gainer," and judge Tom Ewing begs for help!

Judges write down score for Bonetti's maneuv­ er, messenger relays them to board. (See below)

*'U 6 7 ' IO Τλ*- rsr

George Platteter calls for his son Bob, who was 2nd in Class A. They’re from Rochester, N.Y. Scores for each maneuver are posted (Though scrambled) before pilot gets to next maneuver!

Ellis Newkirk, Nashville, Tenn., took 1st in Class B, also won Best Senior award.

Ed Hotelling, 1st in C Novice and also top 20 qualifier, lends a hand to Joe "Kaos" Bridi.

We enjoyed meeting and talking w ith this well known news broadcaster, Paul Harvey.

Ernie Weiss, J & J Industries, placed 5th in C Novice. Royal Elect, radio, J & J Banshee.

expanding years o f radio control compe­ tition. In both incidents, the fault was purely human error, and not a break­ down of the system that has served so well to provide lots of flying for lots of contestants. The first situation came as a result Ralph Brooke blew a maneuver in his last fli­ "If you can find it, you better land it, Phil, the ght, so just relaxed and let it all hang out! of a last minute juggling of the well judges are leaving anyhow."

The MODEL BUILDER 17 Frank Nosen's 1st place Skyraider taxies into the "hangar" at the end of a flight. Logictrol. Webra 61, 13 x 5-1/2 Top Flite prop.

established “ two-frequency-platoon’’sys­ tem, developed, we believe, by R/C Director Kemp Bunting. This system allows simultaneous flying o f R/C scale and C Pattern Finals on Friday and Saturday morning, one at each of the two sites. Basically, all of the frequen­ cies in Scale are split into two blocks, and all of the frequencies in Pattern are split into two similar frequency blocks. Call them A and B. All frequencies in Block A, Scale, can be flown at one site Tom Cook's B 17 makes a bomb run for the judges. Power is four Webra .20's, turning Grish ny­ Continued on page 56 lon 3-bladed props. He won the Best Flying Achievement Award.

Claude McCullough's 6th place Shinn 2150 bores down the runway Not sure whether Dave Platt's famous SBD was taking of or landing. for takeoff. Sure looks empty in that big cockpit! Arresting cable hook is down, but flaps seem to be only half way.

Ralph Jackson's Windecker Eagle is a real smoothie. Power is Webra. "N o right rudder please, Ed!" Ed Ellis' Ryan M2 mailplane bears down radio is Kraft, 12 x 6 Power Prop. Placed 5th in competition. on the photographer. Third place ship is OS 60 powered. Kraft radio.

18 The MODEL BUILDER Dick Graham flips his Liberty Sport after getting the inverted engine Anita Northrop meets Fly Baby. Walt Moucha's ST 71 powered ship fired up. He only placed 14th, but won special EAA award. placed second. Kraft radio, 13x6 Rev Up prop.

Bud Phillips tunes up the engine in his Lockheed "O rion" while Alex Bob Karlsson and his F4U-1 Corsair. Power is an OS 80, Orbit radio. Chisolm,Dist. X V.P. holds on. Line official Dwayne Brown watches. Fuselage is foam planks over a balsa box, carved and then sheeted.

Joe D'Amico taxies his Martin B-26 down wind prior to takeoff. Walt Glemser and Jack Steele (hand on wing) assist Bill Bertrand with Ship (and Joe) is a smooth and consistent flyer. his Handley Page bomber. He placed tenth.

The MODEL BUILDER 19 FULL SIZE PLANS AVAILABLE - SEE PAGE 64 automatically reject a plan that will will that will We plan a reject projects). automatically unfinished your sabbat­ ayear's fill to plans enough with month Each of. dream I designs the all ae3mnh obid ademo our ol daydream build, to 3months take can (count that model specific lime that to of bedevoted is design, amount proven the a or on based original an it be ical. The selection of your next model model next your of selection The ical. us present magazines model major the that, conclusion the to me brought has there will never be enough time to build build to time enough be never will there • Thirty-eight years of model building building model of years Thirty-eight • 20 our An neetn vsa cmparison. com visual interesting n A r! u ho The prim e fo r th a t Enya 60 w o u ld probab ly run the 010 fo r h a lf an Same scene as at the le ft, b u t now M in i is dressed, is i in M now t u b ft, le the at as scene Same an lf a h r fo 010 the run ly probab ld u o w 60 Enya t a th r fo e prim The MINI-FAI FULL SIZE PLANS AVAILABLE - SEE PAGE 64 - SIZEPLANSFULL AVAILABLE in f ht rjc yu ae never have you project that ver­ scale a of Build sion time. building shrink aif or craving. our satisfy year, a least at take will that job super started, to fit a Cox .010 engine. Most Most engine. .010 Cox a fit to started, power for our scale version to simulate simulate to version scale our for power to scale peanut hour 5 a to turn then aaie ln ne ol b doubled. be only need plans magazine EI nhsat tk nt) enough note), take enthusiasts (EAI the most competitive of large engines.large of competitive most the h slto: hik ie n we and size Shrink solution: The h polm Time. problem: The The Cox TD .010 turns 27,500 R.P.M. R.P.M. 27,500 turns .010 TD Cox The can now truly say,"By popular demand, we bring you . . etc." etc." . . you bring we demand, popular say,"By truly now can Williams A. Loren By The special engine backplate is available from the author. the from isavailable backplate special engine The issue, and February the in plane this of aphoto Wepublished glide pattern. MINI-FAI has 100 square 100 has MINI-FAI pattern. glide A special machined aluminum plate, plate, plastic bulky replaces the aluminum profile, low for machined special A up all total a and combined) floating areas stab a into spiral, smoothly vertical flows controlled and a in climbs ak Sc okec scin o avail- for section Workbench Sec tank. ounces). (1.8 grams 50 of weight flying and (wing surface flying total f o inches that model a in instantly, speed almost flying result reachesfull which factors, s mre of ihy eie design desired highly f o merger a is The scale FAI presented in this article article this in presented scale FAI The h MDL BUILDER MODEL The r

Try this on your 8 pound R/C toad! The clean, functional lines are very evident in this photo. ability. Only 25 hours of building time re­ quired. Ready to start? CONSTRUCTION: The key to fast building is to accurately fabricate all components to their exact finished shapes. All your planning of how the model will go together is done during this stage. Although this article will be broken into basic assemblies, read each one carefully and pick out all components that can be prefabricated. The author even goes so far as to cut all tissue pieces to size before assembly of model begins. Careful selection of wood should be made to produce as light a At last! A picture in which Bill Brown's CC^ The relative sizes of the standard tank mount structure as possible. When construction engine doesnť look small. and the special back plate show up here. begins, there is no lost motion; there is always something to put together while The tank is fabricated from two U- plan to solder fuel outlet tube to correct something else is drying. Ambroid fast shaped pieces o f .006 brass shim stock angle. Solder filler tubes to top of tank. drying cement was used for all joints, usually available from automotive parts Don’t worry about pin holes in your except the firewall which uses Titebond. stores. The first U-shape is the 2 sides soldering, as entire assembly is final FIREWALL AND TANK: Cut 1/16 and the bottom, the other being the painted with epoxy. plywood firewall to shape shown on plan. front, top and rear. All 3/32 tubing WING CONSTRUCTION: Cut all ribs Drill engine mountingholes from backing holes are drilled before forming. After oversize, pin together, block sand to plate and fuel outlet lube (3/32 O.D. tack soldering all corners of assembled U- final shape, and notch. Trim each tip brass tubing). Epoxy small pattern 2-56 shapes, complete soldering o f seams. rib to size. Taper leading edge from tip nuts on rear o f firewall. Place tank and firewall on top view of Continued on page 50

From this angle, the comparison of frontal area between the stock rfer® * t*1e Photo that started all the fuss. Published in the Feb '72 tank mount and the special backplate is obvious. Model Builder, Loren got many requests for plans. Here they are!

The MODEL BUILDER 21 First in Senior Stunt, Dennis Adamisin, Taylor, Mich. 489.25 First in Junior Stunt, Mark Bauer, Norridge, III. 324

By Phil Granderson C o n t r o l - lin e and Bart Klapinski

First hand reports by two observers of C/L at the Nats. Phil as a contestant, and Bart as one of the event directors. All stunt pictures were taken by Bart.

• Arriving at the hangar early Monday for Friday’s competition. I went over event. Combat planes were all over the morning, I was surprised to sec so much to pick up on the conversation which place. These man-made freaks o f aviation activity. By 11:00 a.m. virtually all went something like this: fly at speeds in excess of 100 mph and hangar space had been consumed. Mon­ Gene: “ Whatdoya think, Bob?" maneuver in a fashion that is impossible day was a day for paper work, unwinding Bob: “ I don’t know, Gene. I'm a to describe in writing. from a cross country trip (2,200 miles), nervous wreck!" The hangar was aglow with model greeting old friends and meeting new Gene: "Yeah, me to o !!” builders and airplanes. The scene was ones, telling stories and speculating as to Bob: “ How 'bout you, Bill?” one of pure delight to any model aircraft the outcome of this year’s competition. Bill: “ Well, I ’ll tell ya Bob, I think enthusiast and one ol probable disgust No official flying was scheduled for we’re all nervous wrecks!!!” to any model boat fans who may have Tuesday hut unofficial competition was Thus began a day in the life o f com­ been there. Planes were being construc­ going full bore. The weather was cool petitive stunt flyers. ted, rebuilt, and even flown in the hangar. and windy and the familiar sight of Over on the other side of the field, The U.S. Nats is the only place you can airplanes circling around pilots was every­ some speed flyers were testing engines see everything model aviation has to where. Out on the runway, three of the and fuel, trying to find the right com­ offer, under one roof. You can see and nation’s best stunt flyers were practicing bination for success in their particular talk to beginners and world champions

Second in Senior Stunt, Mike Jackson, Long Beach, Ca. 488.50 Third in Senior Stunt, Mike Thompson, Modesto, Ca. 483.75

22 The MODEL BUILDER First in Open Stunt. AI Rabe, Irving, Texas. 627.75 Second in Open Stunt, Bob Gieseke, Irving, Texas. 625.75

Third in Open Stunt, Bill Rutherford's P-51. Yup, he's from Irving. Lew McFarland, Lexington, Ky., flew this Akromaster to fourthin Texas! Good to see scale airplanes breaking into this event. Open Stunt. alike, and all have two things in common: Wednesday was the first day of o ffi­ glue on their fingers and balsa dust in cial flying and suddenly the weather their hair! turned into duck soup. It was cold, rainy, Competition is not just flying; it also and windy in the morning and got worse involves psychology as can be demon­ as the day progressed. Nothing can keep strated by this typical conversation be­ a good man down, as was the case with tween two hot combat flyers from Brian Pardue who was burning up the different parts o f the country: Seniors in 1/2A Speed. With a speed |ohn: “ How ya doing this year, Bob?” of 102.00 mph, he turned the fastest Bob: “ Oh, pretty good but I always time of any age group. He was followed have engine trouble when I come to by Terry Herron and Jim Wade. "2-4-6- Glenview. Must be the hum idity.” 8-10 MaryLou just beat the guys again!!” John: “ Gee, that’s too bad!!” That’s right, folks. MaryLou Brown has Bob: “ How’s your stuff this year?” struck another blow for the women of John: “ Well, my engines arc really America. This time it was in Open 1/2A honkin' but my planes don’t seem to be Speed. With a mark of 98.43 mph, flying so good. I guess it’s the fat a ir!!” MaryLou fried the team of Jett/Upton Bob: “ Fat air??” and down in third place was the John: “ Yeah, in my part o f the Baughman/Kantrow team. In Junior, country, if your airplane weighs more Jimmy Clem was the winner, upsetting than 12 ounces it just falls out of the Glen Vansanl and Pat Hempel. Half A sky, but they won’t ever penetrate the Proto saw Dennis McGraw, Terry Herron, air around here!” Warren Kurth finish 1st in Mr., Sr., and Bob: “ You're right, John. The air is Open respectively.

kind o f thick around here! See you Over in the Rat Race circle, Bill Keller A flock of Tempests, including Junior Stunt later!!” of Centerville, Ohio, managed to ward winner, foreground. Bart Klapinski's design.

The MODEL BUILDER 23 3rd, it was Adamisin 1st, Jackson 2nd, and Thompson 3rd. If you think the point spread between 1st and 3rd was close, just have a look at 1st and 2nd: Adamisin - 489.25; Jackson - 488.50. Only 3/4 of a point separating the two!! Thursday started out as a carbon copy of Wednesday in the weather depart­ ment. Jr. Rat was Rodney Lyons of Plainwell, Michigan reign triumphant over Mark McEndree o f Irving, Texas and Mike Mangan of Willowick, Ohio! Rod­ ney used a Tiger G-21 40 in his original design. In Sr. Rat, Bernie Varnaw, last year’s Sr. combat champ, socked it to Dale Calvert and Stan Stoy. Bernie was flying a “ Boss Rat” powered by a

T/Sgt. Gordon Ford's huge C-5 A, which was featured at Transpo. Ship weighs 38 pounds. K&B 40. Flew at post-Nats A ir Show. As the weather got belter, so did A-Spced. Jimmy Clem was the class of o ff s tiff competition to win Open Rat. the Juniors. Senior saw Terry Herron He used an HP 40 in his “ Boss Rat” . of Wichita zip by at 153 mph with his The new Schnerle Port engines seem to “ Kosmic 15" powered model. Second be making news in Rat Race circles every­ place went to Rick Wisniewski. Third where. Second place went to Ron Esman place was held down by the team of with a Super Tigre. Third place was Camcrford/Langloisof Greensboro, N.C. captured by George Cleveland with an­ Open combat had 135 entries and other HP. promised to be one helluva bash!! All In Junior Combat, Doug Harris got the big names were there: "Honkin buried by Jim Plake, flying his "Under­ Hard” of Lafayette, Ind., “Slippery taker” . Jon Norwood of Shreveport, La. Harold” of Herscy, “ Bubbling Burch” of battled his way to third flying a Voodoo Chicago, Jerry Houpt, Bob Baldus of and a Γοχ 36XBB. Des Moines, and the list goes on. These Sr. Stunt has been dominated by eyes have never seen better combat flying three young men for the past two years. anywhere!! Things started on a slow Mike Jackson, Dennis Adamisin, and note, but when the sun came out so Mike Thompson seem to always end up did the stars of Open combat at the flying away from the rest of the compe­ 72 Nats. There was action everywhere! tition. This year was no exception. With In the air, on the ground, at AMA a mere 5 1/2 points separating 1st and Headquarters, protests, arguments, a sit-

FAI and Slow combat were tried on Friday Bill Werwage, just back from the World Championships for C/L Stunt, which he won! Congrats! after official flying.

24 The MODEL BUILDER Mig 3 by Richard E. Jonas. Max .35, 53 inch span. Lew Woolard's Cobra II. Fox .40 down demonstration, and at times abso­ by, you guessed it, a Rossi 15. lute chaos. With all the sex appeal o f a Speed was the word of the day as Den­ James Bond movie and the excitement nis McGraw whizzed by Glen Vansant of a thousand fleas in your armpit, Open and Pat Hempel to lock up B Speed Combat had a message for contestants, in the Jr. division. In Sr. it was Brian spectators, and officials alike. That mes­ Webster over the team of Camerford/ sage being: Combat 72 just “ Socked-it- Langlois, and Jim Wade was 3rd. A to-you” . The finish saw Michael Wheeler speed of 181.20 was what it took to win and Jeff Hollfelder in one of the rip- in Open. The team of Shelton/Harris snortingest matches of the meet. When of Baton Rouge was 1st, Finn/Martin the smoke cleared Hollfelder had done team finished second followed by John an outside loop about six feet too low Deaton of Ft. Worth, Texas. B Proto and Wheeler won with a design called went to Glen Vansant, Terry Herron, the “ Spoiler” . Third place went to and BARTLEY/Garner/Huff team in Warren Sanders of College Park, Md. It ’s Jr., Sr., and Open respectively. a shame that only one person could win Sr. Combat was almost a repeat of because nearly all the flying was top Open Combat on a smaller scale. More notch. Maybe 73 will see better flying action, protest, arguments, and chaos! but I find that hard to imagine. What a year for combat! Last year’s Friday was “ Rossi Day” in Scale champ, Bernie Vernaw, almost did it Racing. Mark McEndree won Jr. with a again this year, but was stopped by a Rossi 15 powered Little Rebel. Sr. went hard hitting fellow from Dallas, Texas. ■- to Dennis Williams o f Dallas, Texas, J. Russ Green dominated Bernie in the Jm. flying a Rossi 15 powered Buster. Open fly-off and made it known that Texas is Jack Sheeks flew this Fly Baby. McCoy .40 was captured by Kerry Turner also of still the Combat Capital o f the U.S. Dallas flying a Falcon Special powered Continued on page 59

The MODEL BUILDER 25 First in Free Flight Gas. Harold (Bill) Warner's 1936 Waco YKS-6. Rebell .06 diesel. From Paul Matt 3-view drawings. FREE FLIGHT SCALE 1972 NATS The whole idea in the first place was to build models of the big airplanes .... so here they are . . . . indoor - outdoor, rubber - gas. Junior - Senior - Open .... the works! By Fernando Ramos

• This month we will try to give you a their qualifying flight in with little with scale judging for the outdoor events brief sketch of all the F/F Hying scale difficulty. at the Nats, I would like to cover this activities that took plact at the 1972 Fulton Hungerford (Florida) and his briefly. All flying scale models, whether Nationals. Boeing Trim otor biplane drew the most F/F, R/C, or C/L, have to be submitted Indoor flying scale began the first interest from the competitors and spec­ for judging not later than a prescribed day and was held o ff base at an armory tators. The incredible amount of work time, usually Tuesday morning. This in downtown Chicago. All scale models that goes into each of his models is gives the judges about two days to com­ were submitted for judging, including staggering. Fulton spent most of his plete their work. There are nine judges Peanut scale. (Peanut scale is not an time graciously giving out information in all; three for each event. The models official event; it is presently considered on how he constructed his models. Quite are kept in what is appropriately referred provisional.) The judging was handled a remarkable individual. Even though his to as the "Scale Cage” . All the judging by the very capable Detroit Cloudbusters Boeing scored on the high end of the takes place within the confines of this Club, headed this year by George Lewis. static judging, it failed to gain any chicken wire enclosure. Once the models are judged, the flight points. Judging, in the opinion of many, is flying begins. Probably in no other event Tom Stark (St. Louis), a familiar name considered nothing but hard work, how­ are there more untested and untrimmed in flying scale, won the event with a ever, I have found that judging gives a models, since most modelers do not Dehavilland 29. He also placed 2nd in scale modeler some real insight into the have access to suitable indoor flying Peanut scale. way scale models should really look. sites. Fortunately, most were able to get For those who may not be familiar When you can sit down and very care-

Richard Bruning's rubber powered Phillips "Aeroneer," Took first Keith Ward and his magnificent O.S. 15 powered Gere Sport. No room place in Open F/F Rubber Scale. now, but we'll show you some detail photos next month.

26 The MODEL BUILDER Bill Wargo's Douglas 046-A, from Wm. Wylam plans. T.D. .051 plane Andrew Maclsaac prepares his American Eagle "Eaglet." Plane was placed 4th in Open Scale Gas. stolen at the end of one flight, but still placed 3rd . . fully examine a model to see how it is constructed, detailed, and finished, you are really learning what flying scale is all about. Another good learning situation comes from the scale presen­ tation, which includes documentation, three-views, photos, etc. In most in­ stances the modeler's presentation is quite poor, having only a 3-view and a photo. I believe that most modelers competing in scale aren’t really aware that a maximum of 50 points is possible in the presentation alone. On the other hand there are many who are really well-organized, giving the information necessary to adequately and fairly judge a model. If you ever get a chance to judge at any scale contest, do it; you’ll become a better modeler for it. One o f the most highly detailed and well constructed models entered in F/F gas was the Gere Sport Biplane submitted by Keith Ward. Keith’s Gere is one of the finest F/F scale models I have ever Bill Warner. Arleta, Ca., and his Waco. Well known scaler directly over cabin is Frank Beatty. seen. There were no flaws to be found Man in dark glasses is Jay G erber, N F L cam erm an/producer.

Tom Stark repairs R.E.P. Type K, which was "Old Propeller Mouth" Mike Kuene winds up Tom Stark and his Mr. Mulligan, which placed 2nd in Scale Gas. Is th a t a bobbie p in!? his Kingfisher for a flight. first in Open Rubber Scale.

The MODEL BUILDER 27 ers. Thursday morning was the scheduled time lor rubber and gasF/F Scale events, and as usual, for these events, the weather was miserable. It had rained all day and part of the evening before, so by flying time it was cold, damp, and windy. Harold (Bill) Warner and his WACO was the first contestant to fly and gel qualified. He hand-launched his model, which is the usual practice, as this is much easier to do than to try an R.O.G. first. In Harold’s case it proved to be a wise move, because the transition from power to glide was rather abrupt, with the glide angle much too steep. For­ tunately, his WACO landed in some tall Fulton Hungerforďs indoor rubber scale Boeing 80A1. He's the F/F "w ire" wheel man. grass saving it from any damage. After a minor adjustment, he tried an R.O.G., anywhere in craftsmanship, and the de­ and the WACO took o ff most realis­ tail was exquisite. Keith has set a pre­ tically. This lime the transition from cedent in flying scale that will be hard power to glide was just right. to lollow. Harold Warner (California) Tom Stark had a very fine model of also had a magnificent WACO YKS-6 the R.E.P. 7 and he too, hand launched that flew as good as it looked. for his first qualifying flight. However, By Wednesday evening, all models Tom overfilled the fuel tank and by the were ready to be returned to their build­ Continued on page 49

Tom Stark's winning indoor rubber DeHavilland 29. Not pretty, but it flies!

Andy Maclsaac's PT-19 peanut.

Bill Warner releases his SE-1 peanut canard. It also goes "thataway."

Hungerforďs indoor Santos Dumont. It goes thataway! (To your right.)

Ralph Kuenz built this Folkerts "Toots” P-nut Now y all stop pickin' on that poor little SE-5A!" Ship is Bill Bell's 5th place Open F/F Gas entry, which was built from the Paul Guillow kit.

28 The MODEL BUILDER Jimmy Clem launches his Paper Tiger. He won 4th place in Junior Brian Webster launches his Indoor Scale Fokker E lll. Modeler from Indoor Stick. Ship is condenser paper covered. Manchester, Texas took 2nd in event. Mo chance to get a story on the silent and slow ones. . · just some more pictures. At least you INDOOR won't be able to say we didn't show you the Mats

Bill Gough, well known indoor man, flew this canard "Penny Plane." Yep, it went thataway!

Greg Simon flew his original design "D rifte r" Joe Sova's Penny Plane has very low aspect ratio Jim Stone. Chicago Aeronuts and Penny Plane to 5th in Paper Stick.

The MODEL BUILDER 29 30 The MODEL BUILDER The Bellanca's Wms. Bros, prop hauls it up for another calm and Don has the right spirit about scale airplanes. There ought to be a quiet flight. Undercambered wing has lots of lifting power. pilot in every cockpit. These simple profiles drawn by son Darryl. p e a n u t BELLANCA By Don Butm an Another modeler has been caught by the Peanut Tidal Wave! The search is always on for different and unusual subjects. The Bellanca Light Tractor certainly fills the bill.

• “ Safety, efficiency and economy par wings are highly undercambered (think The model flew with no adjustments, excellence!" These words, plus “ Simplic­ my pencil slipped?) which makes cov­ which rather astounded me, since both ity and Grace,” appeared as advertising ering the panel bottoms a bit tedious. The wings warped a bit! But fly it did, until descriptions o f the Bellanca CE 2-Place tissue must be stuck (glued, doped, or ?) the “ airplane-eating-tree” in my front Biplane in Aviation Magazine, dated May to each rib bottom, and I found that yard caught it! 15 and )une 1, 1919. The model shown a drop or two of water rubbed into the Oh yes, one last tid-bit of information on the plans is of the single-place version tissue along with the dope seemed to do from the past. . . Mr. Joseph Bellanca’s powered by a 35-hp Anzani (“ Depend­ the trick. early efforts were financed by the Mary­ able Wartime-Tested” ) engine. It u til­ The use of 1/32 and 1/64 plywood land Pressed Steel Company. He was ized wing warping and had a balanced (struts, fairings, etc.) in place of balsa the Chief Engineer of the Aircraft De­ rudder. eases the pain of cutting small parts. partment, and Mr. Harry E. Tudor was Other interesting facts include a Actually, the 1/64 plywood may be the New York Sales Manager. 11.5:1 glide ratio, which meant that if easily and neatly cut with a pair of The information concerning this Bell­ you could get to 4600 ft. altitude (stat­ fairly sharp scissors. anca aircraft was supplied by Mr. D.D. ed time - 14 minutes, with 25 minutes The two profile “ Pilotes” shown Hatfield, Aviation Historian, of the Avi­ to 15,000 ft.), you could glide anywhere on the plan were installed in my model ation History Library at Northrop In­ "w ithin a diameter of 24 miles” . Fur­ and really do add a touch of realism! stitute of Technology.· ther, only 6 hp was required for horizon­ There is just nothing nicer (well, almost tal fright, er flight! The top speed was nothing!) than a peanut scale model 86 mph with a landing speed of 32 mph. toolin’ through the air complete with The model is typical “ Sticks anu Les Pilotes’! ("Les Pilotes” are the Tissue” construction, with the fuselage artistical creations of the author's son, side shown cross-hatched. The spar-less Darryl. - WCN)

The Bellanca's bones show the simple, light construction. Wing leading edges are 1/16 dowel. On its way for another fun flight, the Bellanca romps away from Darryl's launch.

The MODEL BUILDER 31

CHECKERBOARD FIELD R/C CLUB and COOK COUNTY FOREST PRESERVE DISTRICT

I f k k o M M £ ; ^ m m i k m u k a l í ·1 ______

By John Donelson .... The largest, to date, R/C soaring meet in the U.S. took place in Chicago as the AMA Mationals were getting under way. One of the top placers tells you all about it.

• Hot muggy Chicago weather, 123 as CD, conducted 3 days of competition competitors, but also very good sports­ contestants (the largest yet for a U.S. based on the provisional AMA rules. men. Soaring meet) and midwestern water­ Events included precision, duration, Bob Andris won the scale event, fly­ melon, marked the Third Annual Soaring speed and scale. Ray Vandierdonck of ing a military two-seater trainer Sligsby Nationals held at Miller Meadow, a Detroit, Michigan emerged the grand T-53B. It was interesting to note that beautiful large grassy flying site just champion, flying his original 13 foot all six scale entries were from California; southeast of Chicago’s O’Hare Field. If Nimbus. apparently the scale event has not yet this year’s participation is any indication, The final flying was very heated, with caught on elsewhere. “ look out pattern and pylon, here we the lead changing hands 3 times in the When we got o ff the plane from Los come!” last rounds, after Mark Smith had held Angeles, we really didn’t need the pilot While R/C soaring is still on a pro­ the early lead. Vandierdonck was also to inform us that it was 95 degrees with visional basis and will remain so for on the championship three-man team, the 90 percent humidity. Suddenly we another year, there is no doubt that this Greater Detroit Soaring and Hiking So­ realized why we had left this land for year's Nats showed the powers to be that ciety; the team members placing 1, 3 and sunny California some 13 years ago. R/C soaring is a rapidly growing sport 21. Last year, this club sort of stood But hot weather means thermals. deserving o f full recognition. With nearly back and watched, but this time they Right? And that’s what we came for. twice the number of participants as the came to win, and that they did, besting My two sailplanes had come through the next to largest Nats R/C event, the 17 other teams by a sizable margin. airline flight with nary a scratch, just Chicago SOAR club (Silent Order of It was a popular win too, the members of waiting to try those Chicago thermals Aeromodeling by Radio), with Dan Pruss the Detroit team not only being fierce that were such boomers last year. We

MB's reporter, John Donelson, like others, Whatta place for a berserk steamroller! The transmitter impound area, with Dave Burt's Tube- found thermals a little scarce this year. Too in foreground. Dave placed second in Open Speed with this glider.

34 The MODEL BUILDER Sid Axelrod flying the prototype Topsailer Yoshiro Sato and son, Bobo, came from Japan just to enter Glider Nats. Bobo, age 8, is about to be kitted in the future. Molded balsa body. to take a flight. He won the Best Junior Achievement award.

were to find out that for the next three selected the four events as follows: days they would be much tamer. DOCUMENTED SCALE with emphasis Niel Liptak of the SOAR club had placed upon flyabilily, DURATION conducted a survey earlier in the year (Task I option two of the provisional among R/C soaring enthusiasts, including rules), PRECISION (Task III with the members of the E.C.S.S. and L.S.F., as three minute time option plus Precision- well as those individuals who had com­ Duration Task 11A), and SPEED (Task peted in the previous meets, but were V). Also, the scale runway was selected unaffiliated with either o f the above to be used in the Duration and Precision mentioned organizations. The results events. indicated that most favored a three day Four identical winches (6 volt) were meet, held during the AMA NATS, with built and used throughout the three day two separate competition classes, based meet. A one minute lim it was allowed upon wingspan, as well as a separate for getting o ff the winch, but it appeared Scale category. Also, a combined jr./ that no one had any difficulty in meeting Sr./Open meet was favored and electric this requirement. winches were the launching method most Sunday dawned as hot as the previous preferred. few days, with the mercury topping 90. The SOAR contest board decided that Although flying was scheduled to begin since interest seemed to be high, the indi­ at 9:00 a.m., by that time there was still vidual contestant should be limited to a long line-up for late registration. Dan one ship in cither the Open (over 100 Pruss explained that they had expected inch wingspan) or the Standard class 80, a reasonable estimate based on last (under 100 inch wingspan) plus a scale year’s 55, but not 100 plus! As it worked Grand Champion Ray Vandierdonck receiving ship if he desired. Further, the board out, the p ilo t’s briefing was about 2 hours the silver bowl from CD Dan Pruss.

Here's all the loot and a list of names of the sponsors who paid for said loot. Big time R/C soar­ One of the four duplicate winches used at the ing is here to stay. Only a few contestants stayed on for AMA Nats. contest. Avoided many unqualities.

The MODEL BUILDER 35 The winninq Greater Detroit Soaring and Hiking Society team; Ray Vandierdonck (1st), Otto Jack Josaitis and son, Jason. Jack is Dist. V II Heithecker (3rd), and Earl Pell (21st). vice president of AMA. late. After a minute of silence for the late Howard McEntee, the instructions were given and the 3-minute precision task was underway. One thing that was immediately no­ ticeable was that an awful lot of pilots were flying the ARF Graupner Cumulus 2800. In the next three days there would hardly be a time when one wouldn’t be in the air. The second task for the day, 10- minute duration, was marked by spotty lift, but very good at times, a cursory count showing about 20 percent of the One dozen Cumuluses (or is it Cumuli?) line up for the camera. There were more than this at the glider Nats. A very popular ARF sailplane. flights over 6 minutes. Whether you were one of the 20 percent or not, between flights you could cool off with lots of watermelon provided by Jerry Nelson and Midwest Model Supply. Because of the late start, flying was not terminated until about 8 p.m. in the middle o f the speed round. It was decided to finish the speed round the next day prior to the duration task. There was only one word to describe Monday's flying conditions . . . BAD! Shifting winds and overcast skies dogged this day. The winches were moved twice and not one max was recorded in Interesting "flying stab" control system on Chet Lanzo's Nordic style soarer. DT type stab was duration. After completing the rest of operated by single line from servo. the speed round and one duration round, Dan Pruss decided to call it a day. Duration times were averaging 3-4 min­ utes, with only 2 flights over 8 minutes. O f course, as luck would have it, the Chicago TV stations were out to cover the affair on this day. They were particularly interested in little 8 year old Yoshinori (Bobo) Sato, who along with his father, had come all the way from Tokyo, Japan to compete in this contest. Fie didn’t dissappoint the cameras cither; the little fellow landed his big Albatross 3300 right in the center of the 100-point landing area. He was later to be awarded the best junior

Fiberglass fuselage of Kestrel 19 by Soarcraft. The S69 95 kit also includes wing ribs, stab ribs, achievement award. and complete fuselage hardware. Design was developed by Hugh Stock. With all o f the winch switching, 36 The MODEL BUILDER Doug Munn, Sussex, N.J., and his original design "Intrepid." Ship Mark Smith, California, accepting 1st Place Duration, Standard Class spans 10-1/2 feet, won Best Monokote award. Trophy donated by The MODEL BUILDER.

(try that with a mouth full o f crackers) Monday’s leisurely day gave us a chance to examine some of the sailplanes the contestants were flying. As mentioned earlier the Graupner Cumulus was very popular followed closely by the Graup­ ner Cirrus. The Mark’s Models Windfree was also popular, finishing 1-2-3 in Standard Class, all three finishing in the top 10 overall. They were in good com­ pany with Otto Heithecker’s Snoopy, Rick Walter's White Trash (Jan. 72 Model Builder) and of course Ray Van- dicrdonck’s 13-foot Nimbus. There were several large sailplanes spanning 12 feel or more, probably the most unusual being Buck Zehr’s Zehr Guut. This beautiful soarer looked like a fet fighter version of the Cumulus, only with more sweepback. In the 14-foot category, the Stratus and Strike-S also flew well.

One of the models that got a lot of Dan Pruss "gets down" to the pleasure of presenting the Best Junior attention was Chet Lanzo’s standard Achievement Award to Yoshinori Sato, 8 years old, from Japan. class model. It resembled a free flight with its polyhedral, low aspect ratio wing. Throughout the contest you could see modelers examining the cord- controlled tail surfaces. Dave Burt’s pod-and-boom Tube-Too showed its very effective spoilers, and Sid Axelrod (Mr. Monokote) flew the prototype o f the Willard-designed Topsailer. It features a molded balsa fuselage which is very light (3-4 oz.). Sid says it will be some time before the kit will be available from Top Flite, but it should be a welcome addition to the current crop of sailplane offerings. Bob Andris' Slingsby T-53B, which won the scale event. Only six Continued on page 52 ships were entered in scale, all from California. The MODEL BUILDER 37 p w a

1

Our reporter, Fred Reese, with his El Bandito, ST .15. First Place Bob Novak, 4RS manufacturer, with his Little Mike. ST .15 in July 30 and Aug. 20 races. Timed 2:07 on 2 mile course. PYLON/^

• While watching a recent Formula I with less surface friction drag than a doomsday people have been predicting event I was reminded of statements rough one.) the end of the world and Formula I for made by some who say that Quarter Also the speeds arc increasing and the a long time now. These same people are Midgets are "going the way o f Formula times are getting lower, but this is already predicting the end o f Quarter I,” or that Quarter Midget is just a junior competition and flying skill. We arc Midgets. If they arc rightabout the first, Formula I event.” In many respects I still using the same engines that were then the other two will probably follow. think these statements arc true and I available a year ago. The main thing Quarter Midgets are young and healthy, don’t feel about it now as I have in the that differentiates Quarter Midgets from but not without growing pains; these past. Formula I is speed. Quarter Midgets fly will sort themselves out with time, pro­ In Formula I there is a handicap only one-half to two-thirds as fast as viding we all keep an open mind. system based on scale judging. Conse­ Formula I. What I am saying is that our Quarter quently, Formula I airplanes are well What about the future of Quarter Midgets look good, they fly fast, and we finished and detailed. The quality of Midgets and what will the speeds be a fly ten laps around a measured course, quarter midgets is also getting better year from now? Certainly the speeds four at a time. Appearances are similar with better finishes, filleting and more will be faster and will continue to gel except that our airplanes are smaller detail added, but this is the pride of the faster. We cannot stop the inventiveness and cost less. The engines arc stock and modeler showing and not a class require­ of people where racing is concerned. equipped with throttles which allow ment. (Editor's Nole: Detailing aside, As soon as the label "race” was applied, them to idle, and the airplanes must be finish is not only for pride and/or judg­ the competition began and will continue. landed under power or a penalty is ing. As speeds go up, finish becomes Every person involved wants his airplane assessed. more important. A smooth, dean, well to be the fastest and will work to this We must take advantage of the lessons finished airplane "slips" through the air end as long as the class exists. The Continued from page 47

Bob Gademer's QM Minnow Bill McCalla, Alliance, Ohio, and his Bearcat. Bill Gademer's Cosmic Wind, ST .15.

38 The MODEL BUILDER C liff Wierick gets his first "free ride" after many years of pylon racing. He went on to take first in Formula I.

Guest reporters Bob Upton and Loretta Hall give you their impressions of Pylon at the Nationals. Chuck Smith will be back next month with an analysis of the British Internats.

py§on By Chuck Smith

• Qualifying for the top 20 slots, wheth­ into the rank of the top 20 in either list o f qualifiers. (Bob's brother Chuck, er it was for the Formula I event or the event. In Formula I it took a time of our regular Pylon columnist, has since FAI event, was extremely tough since 1:40.0 or under to qualify. There was dropped the official record to 1:27! there were over 75 entries in Formula I only 12 1/2 seconds separating the WCN). and close to 50 entries in FAI. This fastest from the slowest! Bob Smith In FAI, the team of Telford and year it was an honor just to be admitted turned a fantastic 1:27.5 to top the Violett led the field with a very last 1:45.7. Only 20 seconds separated the fastest from the slowest in this event. Many notables were conspicuous by their absense in the finals of Formula I, including your reporter (would you believe a 1:45.5 placed me around 23rd or 24th in the list of qualifiers?) Some­ how qualifying times are always slower than actual race times, undoubtedly due to the increased adrenalin flow during a finals race. Apparently the incentive to whip the other guy isn’t there during qualifying heats. Formula I finals wound up with Cliff Weirick once again back on lop of the heap, proving, I would say, that we old guys in the "Over the Hill Gang” ain’t whipped yet! Cliff has an uncanny ability to fly best when the pressure is the greatest. The mark, I might add, of a Terry Prather leads Kent Nogy around Number 3. Sturdy pylons a comfort to officials. true champion. Larry Leonard earned a well deserved second while Harold

The MODEL BUILDER 39 Helpers awaiting the starter's flag in a Form I MB's Pylon editor. Chuck Smith heat. Official Howard Nupen holds ears.

tastically low qualifying times in the Formula I event. FAI competition was won by the Korpi/Roy team (K&B) while Terry The winners in FAI. the Korpi/Roy team with Prather of Supertigre fame came in a John Brodbeck,Jr. and a certain duck. close second. Third place ended up in a Coleson was third. A tic between Larry three-way tic between Chuck Smith, and Harold could not be flown off Pete Reed and myself. There couldn’t because of a frequency conflict, so Larry be a fly-off because of a frequency ended in second with the help of his problem between Pete Reed and myself, fastest time of 1:33.5, breaking the lie. so the lie was broken using fastest times. The Smith brothers (Bob and Chuck) Thus Chuck Smith ended up in third had bad luck, with Bob failing to get place with a 1:56.3. o ff the ground due to a radio problem Racing at the Nationals has never and Chuck, while doing very well, been better and the efficiency and wrecked his beautiful Miss Dora in a professionalism exhibited by Glen Spick- collision with a runway light, thus knock­ ler, Jan Sakert and all the others assured ing him well down in the standings. a well-run contest. This is the year of the K& B Schneurle The following comments were solici­ ported engine, in that 8 of the top 10 ted from Loretta Hall, girl pylon flier fliers in the Formula I finals were run­ and enthusiast. Loretta and her husband, ning them. Needless to say, john Ken, were among the team that helped Brodbcck was one happy fella. I think run the Pylon affair. it can be safely stated that this engine The 25th Nationals. A kaleidoscopic Model Builder's west coast advertising

In case you don't recognize the corncob pipe, that's Buffalo's Hal Larry "The Hat" Leonard stays loose between heats. Note "Baggie" deBolt, starting up his FAI Caudron racer. He placed 7th. over that very valuable Schnuerle K & B .40.

40 The MODEL BUILDER Wed. Aug. 30, 1972 We checked in at Cranfield around • The flight over was perfect, though 5:00 p.m. and started things out wrong we weren’t sure that the runway was at the p ilo t’s briefing. They took a vote long enough for lift-off. Doug (Spreng) whether or not to have race-horse starts was in England with the VW van to meet and the Swedish team said no. They us and we dropped our planes o ff at then said that each clock would be Skyleader Radio (they arrived with no started when each plane was released damage). We then checked into a small and the order of finish was to be deter­ hotel just outside London in East Croy­ mined by time. Needless to say, the don. The first thing we noticed was that American team came unglued and we had the beds were as soft as pillows and a big hassle over the interpretation o f there were no showers. the rules exactly as we had at Mile Square We then took the train and subway on for the BIRD’S race. This was finally Tuesday and Wednesday to lour London. solved by convincing the Swedes to go We were on our own on Tuesday, but along with everyone else. on Wednesday, we got on a free bus shows unusual restraint in releasing The next point they brought up was tour which included a delicious free the rule that we had 6 minutes to lunch at the Hilton. The tour was for finish a race. But the way they inter­ Americans only, and was sponsored by preted this was that if you didn't get a real estate company which then showed started in two minutes, you still had us the advantage of buying land in six minutes to start the engine and Florida! finish the race! Also, if you nose over Overall, London is a great place to on takeoff or had your engine quit visit but I wouldn’t want to slay for any in the race, you could restart and length o f time. The weather was fairly finish the race provided you could decent while we were there. do it in six minutes! Another big hassle, We went up north to Birmingham on but we couldn’t come close to changing Thursday and stayed in a little better their minds. hotel (but still no shower). On the way One of the English flyers asked if up we stopped at Hemel Hempstead there was any lim it to how low we where Radio Models is located. It is could fly. The Contest Director said no. a really nice, modern, small town and is There was a lot of partying afterward the one place I saw in which I wouldn’t and we didn't get to bed until 2:30. The mind living. accomodations were excellent. We each Friday morning we went to an RAF had our own room and there was actually airfield with Terry Cooper to test fly. a shower! We finished repairing Jeff’s Jeff (Bcrtken) was the first to fly and plane about 1:00 a.m. everything went perfect until interfer­ On Saturday, we had 45 minutes in ence caused his plane to roll in on the morning and 45 minutes in the after­ landing, tearing up the wing, and fuse­ noon for test flying. The British went lage. Doug and Terry (Prather) flew and first, and Tony Dowdcswell and Alan rep. Bob Upton, who placed 5th were both getting hit, so that ended the Mann both crashed on 26.995 (mine test flying. and Larry’s (Leonard) frequency) and Peter Pillsworth flew through the Num­ ber 3 pylon. Whit (Stockwell) and Jeff both had good flights. Larry’s flight went OK until he got a down glitch *' on landing and really bounced hard. I got two laps on my first flight when the plane pulled up and rolled inverted at No. I. I got it back and landed OK. Gary Kurpi flew and only had inter­ mittent control. Terry and T-V (Telford and Violett) both flew with no problems. In the afternoon, Doug flew and also had interference problems. I flew again and got the plane trimmed out, but got hit bad again. Whit flew again and was all over the sky. He had all kinds of excuses until he landed and found out he had Terry’s transmitter! After Satur­ Basil Derrough, St. Thomas, Ontario, Canada, keeps his "Miss Canada" P-51 down low around day, none of us had any confidence in pylons 2 and 3. His P-51 is original. Continued on page 54

The MODEL BUILDER 41 Roland Boucher’s semi-scale Ak romaster with Astro-10 electric pow- Ship is not exactly a flying battery pack, but it is hauling quite a er. No throttle on this one, just rudder and elevator. load of portable electricity. Tests show it is all very feasible. LISTEN M A ...N O NOISE! An examination of the basics of model flight using electric power. A possible answer to the noise and air pollution problems. It has been proven practical. By Bob Boucher • Two years ago, when first examining the feasibility of electric powered flight, the power-to-weight ratio of the battery and motor combination was the first consideration. A simple calculation showed that nickle cadmium batteries can usefully deliver over I0 times the energy of a rubber motor and about I/6 the energy of glow fuel. Since the fuel load of the average R/C ship is minimal, and since rubber powered planes have been Hying for years, eventual success was assured. The development o f a prac­ tical power plant took well over one year and is not the subject of this article. Its virtues of near absolute silence, instantaneous starting and in-flight re­ starts (for powered gliders) arc counter­ weighed by nearly a 10 :1 decrease in specific power (watts/lb). For the aerodynamically inclined, this new challenge o f power-limited flight could breathe new life into model aero­ nautics. This article will deal with the principles of power-limited flight and develop guidelines for those who may wish to take up this new and challeng­ ing branch of aero-modeling. The basic parameters important in the calculation of the power required for flight arc wing loading (Q); aircraft weight (VV); aircraft velocity (V); co­ efficient of lift (C(_); and coefficient of drag (Cq ); and thrust (T). The second­ ary parameter of aspect ratio (Ar) and wing span (S) is also important. The power required for level flight is the product of the thrust required to over­ come drag and the flying speed of the aircraft. As shown in equation No. I, Aircraft Power Requirements for Level and Climbing Flight (I) P = FV

42 The MODEL BUILDER can be approximated by a value of 0.2 (2) for model aircraft. For indoor rubber models the coefficient might be doubled. For real aircraft, it might be halved. Using this minimum value o f K and con­ (3 ) v = y 840 q verting from power in ft/lb/sec to watts, CL reduces equation No. 6 to:

(4) Q = _W£i£hl_ = W \ p _ 7.5 W3/2 Wing Area ^2 mm s This value is plotted in Figure I as a function of aircraft weight for a number (5) CD = π A.. + CDS + CDF of wing spans (a propeller efficiency of 50 percent is assumed). Any excess power can also be used to increase air­ (6) craft speed in level flight. Figure 2 shows the ratio o f power available to minimum power which will be required as a function of relative flight speed. + CDS + CD fuse These figures can be used to predict the performance of new designs. To clarify = J 840 w3 their use let’s look at a scries of Astro RELATIVE AIRCRAFT VELOCITY V /V „,.A Flight test aircraft, in the order in which ST A L L they have evolved. Aircraft Power Required as a Function o f Flight Table 1 shows these aircraft and their W3/,2K ! Speed for 3 Aspect Ratio’ s performances. The first aircraft speci­ strating that weight is the most impor­ fically designed for electrical power was tant single parameter. Since the Midwest where: a Fournier Milan which was demon­ Cardinal weighed over one pound empty, P is power in ft/lbs/sec strated at the Model Airplane Trade further improvements could be expec­ V is velocity in ft/sec Show in April 1971, later in England, ted by building an all balsa ship of the Q is wing loading in Ibs/ft2 and at the 1971 AMA Nationals. Its same general size. The Spirit of St. C)_ is coefficient of lilt performance was good, but the long Louis was constructed and flew better wings prevented any serious aerobatics. C C[) is coefficient of drag than anything previously attempted. TJ?e The second ship was a stock Astro last three o f these aircraft were dem­ Cqs is win8 section drag Flight kit. It flew much better but its onstrated at the 1972 MATS show. coefficient rate of climb was poor, requiring con­ At this show, Midwest announced a new C op is fuselage section drag stant energy management as maneuvers radio battery, the use of which would coefficient were attempted. This ship raced against reduce weight another 10 percent. We A,· is aspect ratio of wing 1/2 A pylon ships and placed third in are looking forward to having some of S is wing span one such contest. these to test. F is thrust required to overcome The third ship, a Midwest All-foam To further clarify the use o f Figures drag in lbs. Cardinal, flew well with a better climb 1 and 2, let’s go through the calcula- rate than a long wing RF-4, demon- Continued on page 63 The other principle parameters of thrust, velocity, wing loading, drag co­ T A B L E 1 efficient, are determined by equation Astro Flight Test Aircraft, ASTRO-10 (75 watts) Nos. 2 through 5. The first term in the w ing w eigh t P m in V flig h t drag coefficient equation No. 5, is the span area rate o f AIRCRAFT lbs (W atts) V stall c lim b tim e familiar induced term which is strongly feet sq.in. affected by aspect ratio; the second term Fournier Milan 8 625 3.5 12 2.3 345 3 is the sectional drag coefficient which is a function of wing profile and Reynolds Fournier RF4 5-1/2 414 3.5 18 2.2 260 3-1/2 number; and the third term is a function Midwest Cardinal 4 290 3.0 20 2.3 290 3-1/2 of fuselage and tail design. Fortunately, for most of us, none of the above need Spirit of St. Louis 4 300 2.5 15 2.6 450 5 to be calculated to obtain a reasonable estimate of the power required for level TA B L E 2 flight. Comparison of ASTRO-25 and ASTRO-10 By a judicious combination o f equa­ span w eight P m in V rate of % pow er % % tion Nos. I through 5, an equation for AIRCRAFT feet lbs (W atts) V stall c lim b plan t radio stru cture the power required can be obtained in Spirit of (1n) 4 2.5 15 2.6 450 55 25 20 which only wing span and weight are St. Louis 110' important. This is shown in equation R F Í . (25) 6 5.0 27.5 2.6 500 50 15 35 No. 6. (We were afraid o f that! — WCN). meads RF-4 (25) 39 450 70 18 The minimum value of the factor K is world record 6 6.5 2.4 12 nearly independent o f aspect ratio and

The MODEL BUILDER 43 A typical fast start in the Expert class at Briggs Cunningham Museum track, during the ROAR Nationals. Proper carburetion keeps 'em rolling. r/c a u t o n e w s By Dean Brown .... A look at the carburetion problems faced by R/C car enthusiasts, plus a few words on what it's all about. According to many experienced en­ "flameouts” . The amateurs usually idle at approximately 300 rpm into a thusiasts, the best thing that has hap­ divided a race into equal parts of racing corner, up to the vicinity of 20,000 pened to R/C car racing is the avail­ and time spent in the pits restarting the rpm on the straightaway. The engine ability of an effective carburetor for the engine. The novices rarely got out of must decelerate and accelerate smoothly Veco 19 engine. Some even go so far the pits with the engine running. And the and not load up when the throttle is as to say that the discovery o f an import basic cause of all the trouble was the suddenly closed. unit in early 1972 and the more recent engine’s carburetor. A t least it was Such demands o f engine carburetion appearance of a U.S. made unit designed called a carburetor. But if you believed Continued on page 62 specially for the engine, kept them from that it was a carburetor which would (a) jumping off a cliff during a fit of meet the unusual demands of R/C car frustration trying to make the engine racing, then you also believed in the run at idle and low speeds, (b) being Tooth Fairy. pushed o ff the cliff by friends who The low-cost design o f the carburetor, couldn’t stand to see a grown man cry combined with a throttle coupled ex­ every time the engine died in a turn, or haust baffle, just doesn’t work for R/C (c) junking the whole idea o f R/C car car use. The thing seems to work ade­ racing and taking up a less frustrating quately for aircraft use, but it lacks some activity such as stacking ping pong balls important features necessary to meet during a hurricane. the needs o f frequent low speeds, idle, The early years of R/C car racing were and acceleration o f the car engine . . . terrible times when it came to keeping without giving up top speed perfor­ an engine running lap after lap. The mance. experts of the day barely managed to Engines in cars must perform equally Numbers indicate relative pressures. complete a race with only one or two well in the range of operations from

•MR INI LT

IO CRANKCASE

44 The MODEL BUILDER The MODEL BUILDER CJI 3/8 inch square leading edge in place. Lay the 3/32 inch leading edge sheeting in place and trim o ff the excess where it overhangs the spar toward the tips. “ MATCHED FINISH SYSTEM" Use this piece, trimmed o ff from the root rib outward, to finish o ff the leading the perfect COVER UP for your favorite model edge sheeting. Cut the trailing sheet pieces from light to medium wood, "C ” grain preferred, FIBERGLASS- f o r covering glue the 1/16 inch square to one edge The first component in the "MFS" is K & B Fiberglass, the highest qual­ of one of these, check trailing edge of ity, toughest weave fiberglass available and made especially for use with polyester or epoxy resin. Its excellent contouring qualities make it easy ribs at this time for alignment to the to apply to compound curves. plans, glue the trailing edge sheet with the Available in 3 weights — 38" wide LINEAR YD. 1/16 inch square on the ribs, butting LIGHT % OZ. CLOTH $2.95 the 1/16 square up against the back end For all wood airplanes — cover 100% of ribs, and pin firm ly in place. Sheet MEDIUM 2 OZ. CLOTH $2.95 center section o f panel, add cap strips For increasing structural strength around fillets, nose, or inte­ rior of plane. to ribs and let panel dry good before HEAVY 6 OZ. CLOTH $2.75 removing from bench. _____ For joining wings or molding your own parts. When dry, turn over and pin spar < 5 H > SUPER POXY RESIN — for sealing and applying glass cloth down to plan at location and also to the jig. Glue lop leading edge sheeting, K & B Polyester Coating Resin is the second element in your ''MFS.” It has been created to include all the characteristics desirable in a resin trailing edge sheeting and rib cap strips and its application. in place, and let dry. Easily workable: Requires minimum sanding Draw a straight line on your work Little, if any, clogging of sandpaper bench (or FLAT board) slightly longer Curing time adjustable by the amount of catalyst. Durable: Does not become brittle than the total span of the wing, lay the 1 QT. (including catalyst) $3.95 panels upside down on this line (wing is flat on top, dihedral is built into Micro-Balloons FILLER — for fillets, dings, or dents bottom), make a mark at No. 10 rib for Mixed with K & B Resin the Micro-Balloons FILLER is perfect for fillets the jig. Lay a short piece of 1/4 inch or filling in defects (or repairing later damage). As part of the “MFS" it square down at the position shown on ty- i sands beautifully to a smooth, strong, hard finish. 1 OZ. $1.49 the plans for the jig at No. 10 rib and pin in place. Make a mark where the jig s ) SUPER POXY PAINT — for the “Ultimate Finish” should be for the root ribs, and lay a scrap A development of the space age, Super Poxy Paint is the concluding o f wax paper on the bench where the phase of the ‘ MFS." Formulated exclusively for models. . . mix and use center section will be to keep the epoxy (NO WAITING TIM E-N O HAND RUBBING). Fast curing and quick drying, it sets up rapidly for minimum dust adherence. Stays glossy longer, least from sticking to the bench. Position the affected by ultra-violet sun rays or manufactured fuels. panels and check the root ribs for align­ Six Basic Colors — 21 additional by mixing ment with each other, sand if necessary, 4 OZ. $1.15 8 OZ. $1.85 pin one panel down on the line and to Clear and Primer 8 OZ. $1.70 Primer Catalyst 8 0Z. $1.70 the jig, mix up some 5 minute epoxy, Thinner______PT. $2.25______OT. $3.50 smear on the root rib, join the panels and pin to bench. Cut a slot the full * “ MATCHED FINISH SYSTEM” depth o f the spar 1/16 inch wide, direc­ A total system — everything for finishing tly behind the spar at the root rib s, balsa wood model planes.______check the 1/16 inch ply joiner for fit, K&B MANUFACTURING smear with 5 minute epoxy, and slide DIVISION OF AURORA PRODUCTS CORP. in place. 12152 WOODRUFF AVE DOWNEY. CALIFORNIA 90241 OPTION ON BUILDING WING: A k r o ...... Continued from page 11 covering is applied. It is simple and quick If your workbench is long enough to play up or down on the assembly in the to build, giving a light weight wing when build the wing in one piece, join spar aileron fitting, and make a 45 degree completed. while pinned down straight on the bench bend under the collar. Either make Cut the two panel spars exactly alike with the 1/16 inch ply joiner, place the a fork from brass strip, which looks from the same sheet of medium to hard 2 pieces of 1/8 x 1/4 inch cap spar in quite realistic when soldered to the wire straight grained 1/8 inch balsa. Glue position over the plans, glue the 1/8 as shown on the plans, or simply bend the 1/8 x 1/4 inch cap to each of them inch full depth spar to the cap, fit and the wire to accept the tail wheel. taking care to end up with a right and install the ribs, and glue all the bottom The wing is built using a I/8 inch left spar. sheeting and caps in place, along with sheet full depth spar with a 1/8 x 1/4 inch Pin the spar upside down over the the 3/8 inch square leading edge. cap on top to form an inverted J type plan. Pin the 1/4 inch square jigstrip When well dry, remove and pin one spar beam. When combined with the over the plan at location·shown, check panel down over plans with the 1/4 jig "egg-crate” type panel construction, each rib to sec that it fits before glueing in place, apply sheet and cap strips, sheeted at leading edge and trailing in place to the spar, (use a 90 degree then pin other panel down, sheet and edge, the results are a very rigid wing angle when glueing root rib). Pin ribs cap strip, glue center section sheeting that is difficult to twist even before the to spar and the 1/4 inch jig. Glue the in place, and the wing is finished with

46 The MODEL BUILDER ASTRO FLIGHT , INC. ANNOUNCING...... 2301 Cheryl Place THE QUIET REVOLUTION Los Angeles, Ca. 9 0 0 4 9

1/10 HP («> 12,000 rpm WEIGHT 20 oz. 1/4 HP @ 9,000 rpm DURATION 5 min. WEIGHT 40 oz. DURATION 8 min.

ASTRO-25 $79.95 (INCL. BATTERIES)

Astro Flight, Inc., pioneers in silent flight, demonstrated the world's first successful electric powered R/C aircraft at the 1971 MATS show in Anaheim, California. A revolutionary, quiet, clean, reliable, and economical power plant, the 1/10 horsepower motor used in this aircraft has now reached production status as the Astro 10. On February 5. 1972. the Astro 25 powered Roland Boucher's Fournier RF 4 model to a half hour world record closed course distance flight of 19.26 miles. These precision machined ball bearing motors have been thoroughly tested in more than 1000 actual and simulated flights. Special nickel cadmium batteries supply the energy and can be recharged m the field in just fifteen minutes from a standard motorcycle battery, at a cost of about one cent per flight. the exception o f the I/4 inch sheet tips o ff the board” , this fellow’s design "flew of pleasure in building and flying this and the I/4 x I inch trailing edge. In­ right out the window! one. Who knows, the judges might even stall the dowels in the wing with epoxy. (Wouldyou believe? There s a Square award you a trophy for your efforts!! It Cut B-1 -P slightly oversize, drill holes for Hare out in the garage right now, covered does fly well and it has been a pleasure dowels, fit wing in place on fuselage, in ten colors of Monokote scraps, pow­ developing i t . · lining it up for square, trim B-l-P to fit ered by an Enya 19, and equipped with fuselage side, and epoxy in place. a 1970 Micro-Avionics "Proportional p y lo n /4 .... Continued from page 38 Glue hardwood block inside fuselage Ghost. ’’ - WCN) back corners, fit wing and check for DATELINE: July 30, 1972. Witnesses, learned from Formula I, as they too used alignment, pin wing to keep from shift­ the BW and 2 offspring. I have to drive to have throttles, but stopped using them ing, drill down through 1/I6 ply and about 7 miles to get to our local field as there was no provision in the scoring through hardwood blocks for nylon (I don’t have a window in my shop for the use of the throttle. screw hold downs. I have never had anyway). After range checking, getting We also must be careful concerning any trouble using the No. 8 screw (if you the engine running, checking controls quantity o f engines or parts manu­ feel safer with 1/4 inch, by all means once more, I taxied out and lined up, factured. In Formula I it was thought use 'em). Tap the blocks, screw the wing opened the throttle, watched as the SA that a hundred engines manufactured in place, epoxy the paper/epoxy tubes in tracked straight for about 60 feet then would be enough, but as proved this place, and glue the turtle deck sides on broke ground and climbed quite steeply. year, a hundred engines can be distrib­ using saran or polyethylene sheet at LE Tapped some down trim and it leveled uted and still not everyone has one. and TE to keep from glueing turtlcdeck out OK, made a turn back . . . needed (On the other hand, it could be that to fuse. After turtledeck is sheeted, left aileron and left rudder trim to make not everyone wants a particular engine.) fit canopy, doing whatever your “ creative it fly straight . . . a few more turns to Five hundred would be better but still bent’’ causes you to do inside the canopy feel it out and then some “ cavorting” would not be enough to make the engine for realism. (hmmm) over the field. It does every­ generally available. Supertigrc has im­ Cowls are now built using nose ply thing an aerobatic model should do with ported several thousand RC .I5 ’s, yet plate, formers and strips: the picture a .35 in it. With a good .40 (which I they arc still hard to find many places. shows it better than I can explain it. plan) it should do vertical 4 point rolls By setting the engine limits at 1000 Glue the top o f the 1/64 inch ply on and anything that suits your style of units of the RC version available in the first, when dry, wrap and epoxy the flying, with ease. U.S., we will at least have a chance. ply around the formers (rubber bands Remember, this is a “ Sport Scale” The situation is somewhat perplexing, help here), checking for a good smooth model of competition aircraft and you as we want to race in a manner similar fit at the bottom of fuselage. Smear will not be limited by an FAI pattern to Formula I yet still be different. the inside of the right cowl with Sig (I respect you guys who spend hours The QMRC has revised its scoring epoxy to fuel proof, this side is function­ perfecting your routine. No sour grapes, procedure, and although the changes al, the left one, a dummy. but that’s just not my bag). Try a 45 arc logical, they were derived by trial The exterior finish is up to you! degree ascending, inverted, outside snap and modification. Several months ago, A few years ago there was a fellow (full size ones do it in competition). we increased the penalty for a cut pylon using Mighty Midget motors wired into The landing pattern and approach is but did not change the positions at the the relay on a single channel receiver what you would expect o f any symmet­ finish nor the scores of the others in and flying what was then called Galloping rical airfoil, high performance model, that heat. The earlier system worked but Ghost. He had a model called, if memory but it does slow down nicely without was not equitable. serves me, “ The Square Hare” . This "falling apart” for beautiful 3-points The modified scoring is as follows: fellow was from Delaware (Correct - (a good one of these is worth the trip four points for first, three for second, WCN) or Maryland or someplace where to the flying field). two for third and one for fourth, with they eat hot steamed crabs and drink I would not recommend this as a a 1/2 point deducted if an engine beer. He apparently had a window in first model, but if you have a couple of quits before the wheels touch during his shop right over the work bench. experiences in your log book, like the landing. If a pilot cuts one pylon and Some modelers who design are lucky medium range engines, enjoy a realistic still finishes the race, he can only receive enough to have a new one fly “ right looking model, I think you will find a lot one point, no matter what his final and is easy to set up uniform ly, any­ where. A simple solution might be to use the same dimensions for pylons two and three and the start-finish line as in ★ ★ ★ ★ ★ ★ ★ ★ Formula I and II but shorten the distance from the start finish line to pylon one A L L STAR from 506 to 300 feet. This would BIPLANE KIT certainly simplify multi-event race days and bring the average times closer to ★ ★ ★ ★ ★ ★ ★ ★ two minutes. First though, we will have to try it. Racehorse starts were also tried at the August 20th race, and although there was a collision in the first heat, there were no more the rest of the day. During previous races, there have been takeoff Designed by Roman Bukolt collisions even when using a staggered start. Those who were worried wailed FOR UP TO .15 ENGINES a second before releasing their aircraft. The newest plane in the Ace Foam Wing Line. Published in Racehorse starts were written into our RCM. Designed by Roman Bukolt. Kit contains over 60 die rules so as to be used only when the cut and precision sanded balsa and hard wood pieces. $21.95 majority of the pilots wanted it. In normal fashion, the decision was demo­ cratically railroaded through on this date but I was glad for the chance to try it and the problems presented were easily Your dealer has it-- overcome. In fact, it was nice to be If not, order direct. able to take o ff at the same time as my INC. rivals instead of one or two seconds ICGINSVIl It Μ O t> « 0 3 > later. The results of the August 20th race held at Mile Square in Orange County, OUR HANDBOOK-CATALOG HAS COMPLETE LISTING. SEND S1.00 California were: (Distance: two miles.) standing is in that heat. Two cuts result course to better suit our preferences. First: Fred Reese, ST.15, El Bandito, in a m o . The flyer who cuts one pylon The 156 fool short leg presented some 2:07 is automatically relegated to fourth place problems, but the longer straightaways Second: Tom Melshimer, OS .15, Cassutt and the others who do not cut are ad­ gave more lime to set up for pylon Special, 2:23 vanced in place accordingly. If ihe first number one, which was easier. 1 he Third: Chick Brown, OS. 15, Minnow, place finisher cuts once, the second place longer straightaways gave an advantage 2:15 finisher gets the win and all four points to the faster airplanes but this advantage Fourth: Bob Novak, ST. 15, Little Mike, instead of three points for second. If all could be lost negotiating two and three. 2:33 flyers have one cut, they all get one The course will be analyzed at our Fifth: Bob Johannes Sr., ST .15, Min­ point, no matter what the order of next meeting to determine what will now, 2 :1 3 linish. If the fourth place finisher cuts be done at the next race. The biggest Fastest time was 2:07. once he still gets one point, as he is still complaint was the long 156 foot distance last and finished the race. If a flyer docs between two and three. One hundred On July 30th the MARCS tried out not finish all ten laps he gets a zero. This feel would probably be better. However, a variation on their two pylon course revised scoring system is more equitable a wide area must be maintained where with two more pylons in the middle for the flyers who finish without cuts, the pilots and other personnel stand, for spaced 85 feet apart to force the airplanes and progressively increases the penalty safety sake, and to allow wide spacing around the pilots and provide a safety for a cut depending on the place of of the airplanes if race horse starts arc area. They had mixed emotions about finish. to be used. Twenty feet between air­ the course and decided that more prac­ As I mentioned in the last issue, we planes is adequate. tice was needed. Distance was two miles. flew a two mile triangular course on I suspect that the consensus will be to August 20th, and as expected, some shorten the course again, although not First: Ken Oakley, 2:17 liked it and some didn’t. The course had necessarily as short as it was before. Second: Eddie Nobora, 2:34 two 450 foot straightaways with 156 feet The fastest time around the two miles Third: Bill Gadcmcr, 2:39 between pylons two and three. The was 2:07, but the averages were around Fourth: Bob Gadcmcr, 2:42 pilots stood 300 feet from number one. 2:30. I think the average times should Fifth: Bernic Old, 2:42 The course was an attempt to com­ be closer to two minutes, which would Sixth: Mike Pcnko, 3:52 promise between the 515 foot course of mean adjusting the course length. I feel the MARCS and our previous 350 foot that the course length should not be dic­ The MARCS Fourth of July Quarter short course. The MARCS course is tated by an arbitrary figure that sounds Midget race had Ed Nobora first, with a fifth of a mile in lap length, so we good, but rather by one that is comfort­ Bob and Bill Gadcmcr second and third. wanted to try that distance but vary the able to fly, is safe for the people involved, No times were given. ·

48 The MODEL BUILDER p ylo n ...... Continued from page 40 series of sights and sounds and im­ “FULL HOUSE PLUS THREE” pressions and emotions. Excitement and wonder; knowing that we were on our own. Could we do it alone? Could we set up the whole show and then run the whole show and then take it all down and clean it all up and get all of these things done in the alloted lime? Frustration; Putting up the last few yards of crowd control fence while the first 300 yards was toppling over like dominoes. Triumph . . . It was ready! The pylons were up, the fences were standing Great New Single and we were ready to go. Anticipation: The look on the face of or Dual Stick Designs each and every contestant who came by the entry desk that said, “ Maybe this year! ” Agony: Watching Whit Stockwell, Eight independent channels in a package no bigger than conventional full-house transmitters. Choose with only one more heat left to qualify either single or dual-stick control in 27, 53 and 72 MHz operation — with adjacent frequencies at no extra cost. Both transmitters have a two-position switch for landing gear, finger adjust tabs for auxili­ for Formula I, having engine trouble on ary channels; trainer link jacks and “buddy button"; external charging jack for simultaneous charging the flight line and not getting started. of transmitter and receiver batteries; eight range controls for adjusting servo travel. You can order Then further agony sweating it out while your Heathkit Eight-Channel System with any combination of fourGDA405-4 Miniature Servos or GDA-505-4 Sub-Miniature Servos. With receiver, battery pack and four Miniature Servos, airborne weight the same thing happened to him three is 13.3 oz. Substituting four Sub-Miniatures, shown in illustration, brings the weight down to 11.3 oz. out of the four heats in FAI finals. If you want eight-channel flexibility, the GD-405 systems, at build-it-yourself Heathkit prices, are the He will not have to worry about bad luck only way to fly. any more, he spent his full allotment at Kit GDA-405-S, Single Stick Transmitter only, 4 lbs...... $139.95* Kit GDA-405-D, Dual Stick Transmitter only, 5 lbs...... $119.95* the Nats. Kit GDA-405-2, 8-Channel Receiver only, 1 lb...... 54.95* Joy: Watching C liff “ Over the Hill Kit GDA-405-3, Receiver Battery Pack only, 1 lb...... 9.95* Gang” Weirick dance a jig and whoop Kit GDA-405-4, one Miniature Servo only, 1 lb...... 24.95* Kit GDA-505-4, one Sub-Miniature Servo only, 1 lb...... 24.95* and hollar after flying one of the “ gut SAVE ON A SINGLE STICK SYSTEM; consisting of transmitter, receiver, battery pack and any four servos. grabbing” races of all time to beat Larry Batteries included. List model numbers separately. Leonard and take first place in Formula Special System P ric e ...... 269.95* I. Then more joy at the banquet when SAVE ON A DUAL STICK SYSTEM: consisting of transmitter, receiver, battery pack and any four servos. 450 people gave him a standing ovation Batteries included. List model numbers separately. Special System P ric e ...... 249.95* as he accepted his trophy. 1 Disappointment: When Bob Smith Schlumberger HEATH COMPANY, Dept. 238-10 crashed on take o ff in the first heat of The FR EE 8enton Harbor, Michigan 49022 the Formula I finals after qualifying Heathkit □ Please send FREE Heathkit Catalog. with the fastest time. He had done an Catalog has □ Enclosed is $______, plus shipping. over 350 Please send model(s)_ encore of his world speed record time fun to of 1:27.5. Further disappointment when build kits. Name______his brother Chuck, who was tied for Order Address______yours City_ -State -Z ip - first place, plowed into a runway light today Prices & specifications subject to change without notice. on landing after getting another first in •Mail order prices; F.O.B. factory. GX-261 the third heat. Amazement: A t the “ ask no quarter, total professionals like Glen Spickler and now we know that we can make it on give none” competitiveness o f the well- his crew, jean and Gerald Christenson, our own. · known Telford/Violett team. Howard Nupen and Jan Sakert got it Pride: In the excellent showing that all together in a hurry and the whole F/F scale . . . Continued from page 28 a guy named Ed Hoteling made. Reason­ thing was run like a well oiled clock: The time the engine quit, the R.E.P. haď ably new to the racing game and with a "after the ball” feel ingot loneliness while flown over the barracks. The model plane that was always last off, he some­ walking around an almost deserted field literally fell out of the sky when the how managed to hang in there and come picking up trash: the anger when the engines finally stopped, sustained quite a up with a ninth place in Formula I. trash was an empty glow plug card or a bit of damage, so Tom returned to the Prejudice: In the happiness the Cali­ racing prop, but the philosophical feel­ main hangar to do his repair work. fornia people all felt when the R/C ing when it was an empty coke bottle or Meantime, Keith Ward and his out- Grand Championship was again brought a hot dog wrapper. standingGcre Sport was readying for the home to roost on the shelf of our own And last but not least, the feeling first official. Keith had flown this model Larry Leonard. of exultation that came when we found many times, so he chose to try an R.O.G. Add to all of these the further out we indeed could do it without the Unfortunately, it only ground-looped, impressions of pleasure at working with Navy! We will certainly miss them but failing to take off. He tried again and

The MODEL BUILDER 49 mini-FAl . . Continued from page 21 dihedral break to 3/32 square at tip, soak in warm water for ten minutes, pin to plan and allow to dry overnight. Glue tip trailing edges to T.E. stock and sand to final shape. Pin trailing edge assembly to plan, add the two bottom spars and cement in all ribs, except in dihedral breaks. After allowing time to dry, remove the wing panels from the plans. Next, carve and sand the leading edges to shape. Pin the main wing panels down and block the tip panels into place at the correct dihedral angle. When in position, add the dihedral joint ribs. The top tip spars are now cut to length and glued in position. Next, pin BUILD YOUR OWN ELECTRIC TOW WINCH the centersection panel down and repeat the blocking and glueing procedure with USING OUR LIGHTWEIGHT the main panels. Cut and glue all other ANODIZED ALUMINUM top spars into place. REEL! When entirely dry, remove the assem­

Full Instructions bled wing from the building board and Two Sizes Available: add all gussets and diagonal braces. Sand • 3 " H ub ...... $19.95 the entire wing to a final, finished form. • 4 " H ub * ...... $24.95 Reinforce all dihedral joints by rubbing 8" OD x 5" Wide. 5/8" Hole (Add $2.00 Postage & Handling) three coats o f glue into all joints for ‘ Featured at '72 LSF Tournament strength.

WESTLAKE MFG., INC. STAB CONSTRUCTION: Same as 14825 Aetna Street wing except all spars are installed on plan. Van Nuys, Calif. 91401 Remove, carve leading edge to shape and add diagonal bracing. Install DT still no take off. While Keith was on all made in dead calm conditions which hooks, noting offset o f rear hook. the sideline starting his engine for a never occurs during official scale flying COVERING: Prior to covering, give third attempt, another model trying to at the Nats! the wing and stab three coats of 50/50 take o ff taxied at full speed into the Just to indicate how strong the wind dope, sanding lightly between coats. Gere Sport. The pretty bipe sustained was blowing, Chuck O’Donnell (New Cover the wing and stab with Japanese damage to the lower wing, so Keith jersey) had his Sopwith 1 1/2 Strutter tissue, dry. Apply the tissue to the wing hurried o ff to the main hangar to make ready to launch, when the wind literally with thinner, which soaks through the some rather quick repairs. took the model out of his hands. tissue and softens the previously applied By this time,Tom Stark had returned Winners of the gas-powered scale dope for adhesion, or if desired, utilize from making repairs on his R.E.P. 7, event were Harold Warner 1st, Tom 50/50 dope in the same manner. Spray and was ready to make his second flight; Stark 2nd, and Andy Maclsaac 3rd. wing and stab with water to tighten the this time an R.O.G. His model took o ff I cannot report very much on the tissue. Brush on two coats o f thin beautifully, but again it was over-fueled, rubber scale event because I was person­ dope and then apply tissue numbers or and again it flew toward the barracks. ally involved officiating gas, and rubber trim with thinner. Finish doping the Tom was unable to find it this time; but scale was being held at the same time. wing and stab, adding three more thin fortunately, someone turned up with I can only say that the rules favor coats on the wing and two on the stab. it early in the evening. flying and most of the models reflect Let the stab and the wing season for at Andy Madsaac (Michigan) didn’t have these rules. Preston Bruney (Michigan) least a week in a warm place. I prefer that kind of luck! Andy was flying a had a beautiful Philip's Aeronccr which to pin the stab down for this period of pretty little .020 powered American placed second. Tom Stark (Mr. Mulligan) time. Eaglet and he also over-fueled his model. was first and George Lewis (Pilitus The combination o f too much fuel and Porter) was third. FUSELAGE CONSTRUCTION: Fu­ the high wind sailed his model over the In closing, I would like to personally selage is built a laStarduster. Cut the two barracks area. From here it was stolen! congratulate Tom Stark for his accom­ pieces for the pylon from medium soft (Someone reported seeing a man load plishment as Category Champion in 1/8 inch sheet, glue and pin flat to dry. the model into his pick-up.) Scale. He managed 2 firsts, and 2 Next, cut the pieces for the fin from the Keith Ward returned with his repaired seconds, as well as qualifying in R/C lightest 1/16 sheet possible. This too model and tried a hand launch for his Scale! should be glued together and pinned third attempt. Unlortunately, the Gere If you have never attended the Na­ down until dry. did not fly, and on his fourth attempt tionals do so! It is a wonderful and Select good, straight-grained 1/32 he damaged the model extensively. A thrilling experience that words alone sheeting for the sides. Trace the out­ real shame. Keith’s previous flights were cannot describe. · line, cut both sides and pin one down

50 The MODEL BUILDER flat on an absolutely straight building surface. Next, cut 1/16 x 1/4 top and bottom strips, slot both for fin and glue sn ercs1 and pin them in place. Note top strip NEW! MARK II ^ Í V ° is in 2 pieces, one forward and one aft FROM THE WILLIAMS BROTHERS of the pylon. Now cut 1/16 square INNOVATORS OF QUALITY MODEL ACCESSORIES doubler for the rear of the fuselage and glue in place. The bulkheads are also cut from 1/16 x 1/4 stock and should be glued in position at this time. Cut the eight required doublers from 1/16 sheet for the front, side, and rear of the pylon. Glue and pin four of them in place as well as the 1/16 square fuse­ lage top & uprights that support the pylon on one side. Now glue the pylon and the fin in position. Cement all the required pieces into place on the top • PERFECT FOR USE WITH ELECTRIC STARTERS of the pylon and fin. When all pieces • RAKISH MUSTANG STYLING are dry, remove from plan. Fill last • LEFT OR RIGHT HAND ROTATION half of fin on both sides with soft 3/32 • SUITABLE FOR CONVENTIONAL OR PUSHER PROPS scrap. • NO UNSIGHTLY EXTERNAL SCREWS OR HOLES Tank and firewall are now installed, check plan for down and right thrust. Precision molded of durable nylon in choice of six colors Then glue other side piece in place. (red, yellow, blue, black, white, orange) and eight sizes. The cheek cowls (pre-shaped) are now DIAMETER: Ι ’Λ " 1 % ” 2” 2 ’Λ ” 2Vj ” 2%” 3” 3’Λ” installed. When dry, the cheek cowls PRICE: 95c $1.05 $1.35 $1.55 $1.95 $2.15 $3.95 $5.45 can be sanded to their finished form. NOTE: 3 '/2" DIAMETER SPINNERS ARE AVAILABLE IN CHOICE OF P-51 OR P-40 TYPE. Install forward D.T. hook at this time in left cheek cowl. SEE THEM AT YOUR LOCAL DEALER. IN CASE OF SUPPLY Glue lengths of 3/32 x 1/4 tapered DIFFICULTY, ORDER DIRECT FROM THE FACTORY. SEND 25c FOR COMPLETE CATALOG trailing edge stock to the top sides of 181 B ST. · DEPT. B · SAN MARCOS, CA. · 92069 the pylon. Also attach the wing plat­ form to the top of the pylon. Sand the fuselage to its final shape and smooth­ week or more, get out the tea kettle and the trailing edge o f the stab for equal ness. Install stab platform and 1/8 high let’s either correct the present warps or adjustments is just half of the side shim, incidence block, building in stab tilt per set in the required one. These warps may be it adding or subtracting. plan. Pre-dope the fuselage with at be set in the following manner: hold Since we have no fuel shutoff timer, least three coats o f 50/50 dope filled wing over steam until the covering puffs take the time to familiarize yourself with talcum powder, sanding lightly after and is covered with alight condensation, with your engine and tank duration. each coat. Finish with 2 coats of clear all the while twisting the panel an equal The tank shown will run, with engine 50/50 and 3 coats colored dope. Rub amount in the opposite direction. peaked out, for just over a minute. out last color coat. Epoxy the snuffer Practice your release timing by starting Immediately after removing the wing tube and the D.T. line guides into place. engine, tuning, lighting fuse, then check­ from the steam, cither rub your cheek Remove tank from your T.D. 010 and ing sweep hand on your watch until en­ across the surface of the panel, or rub the replace with backing plate shown on gine quits. When you become proficient panel across your leg. This saps the plan (stainless flat head 2-56 screws at estimating various release times you’re heat from the wing in a sudden manner furnished). Mount engine with 2-56 pan ready for your first flight. head screws with loekwashers and con­ and sets the warp. Sight check the warp to make sure the amount desired is Release first flight at a 60 degree nect original fuel line. angle; it will be at full speed in about Make monofilament D.T. line, put achieved. Repeat the steps to increase or decrease as needed. three feet! The climb is a tight right small loop in rear to slip into stab hook, spiral with right glide pattern. If further front "S” hook is shown in exact posi­ In order to pattern this ship we must put in 1/8 wash-in in the right main power pattern trim is required, use only tion for 45 degree pop-up with stab in thrust, wing warp, and stab adjustments: flight position. panel. The same technique is used for setting this warp, with the exception do not use any rudder adjustments. Assemble the entire model and align Since this is a high performance bird, the wing by measuring equal distances that only the desired amount o f warp is held into the panel. take your time in making your trim from each wing tip to the rear o f the adjustments. Unlike the javelin launch fuselage. When properly aligned, key TRIMMING - FLYING: With Model of it ’s big brothers, M INI-FAI VTO ’S the wing in place with a split 1/16 diam­ properly balanced, hand glide to obtain right now! eter dowel. Key stab at trailing edge slow, floating glide to the right. Because One final note: In selecting your only. Balance the model to correct of this ship’s small size, a circle of 35-40 takeoff site on a given field, it is man­ center o f gravity as shown on the plans. feet is desired. Shim rear o f stabilizer, datory that you be as close as possible Both the original and the second model as required, for glide. to the Class D and D modelers so they balanced as built. A point to remember when shimming may share the enjoyment o f your 25 WARPS: After wing has seasoned a on side positions, the amount under hours of labor. ·

The MODEL BUILDER 51 PLANS CVTHINGS PEANUT SCALE! PLANS · ACCESSORIES · SUPPLIES

PILATUS TURBO-PORTER 1910 FARMAN This Pinocchio-nosed Peanut is a “ na tura l" for rubber power. 1 3 " Rubber power, stick-&-tissuc type, plans by Bill Hannan. 13" $1.00 span, stick-&-tissue type. Detailed Hannan plans ...... 75 cents FIRST CLASS postage add 25c. W. C. HANNAN. GRAPHICS. P.O. BOX A MANY MORE! SEND A QUARTER FOR OUR CATALOG! California customers odd 5 % . ESCONDIDO · CALIFORNIA 92025 soaring .... Continued from page 37 Looking at the final standings, with I believe that the smaller sailplanes are larger sailplanes!) three Standard class sailplanes (all Wind- easier to land. The large plane advantage Tuesday dawned bright and clear, frees) in the top ten (about the ratio of was born out in the standings; Vandier- with a big relief in the temperature. Standard to Open class), one might con­ donck winning on his better duration L ift conditions were about like the first clude that there is no point in a size times. Ray was one of the few to find day, and tasks for the day were 3-minute distinction. My own opinion on the some lift on the second duration task. precision and 10-minute duration. Mark matter is that the larger sailplanes have With 40 in Standard class and 93 in Open Smith, who had held a comfortable lead an advantage in weak lift conditions, it seems that most fliers prefer the larger from the very beginning, tossed the meet in that they can travel a large distance span sailplanes (with the sailplane pilots into a five-man race when he missed his away, looking for lift, and still be kept buying most of the Monokotc in the precision landing. There was now less in sight to get back. On the other hand, country, Sid Axelrod also prefers the than 250 points separating the top five

1972 SOARING NATIONALS RESULTS

PLACE NAME STATE CLASS SAILPLANE POINTS OPEN CLASS

1 R. Vandicrdonck Mich. 0 Nimbus 4722 PRECISION 4681 2 J. Donelson Calif. S Windfree 1 R. Walters 2000 4640 3 O. Heithecker Mich. 0 Snoopy 2 O. Heithecker 1600 4610 4 M. Smith Calif. S Windfree 3 R. Vandicrdonck 1480 5 R. Walters Calif. 0 White Trash 4312 6 D. Nutter Okla. 0 Grand Esprit 3917 DURATION 7 R. Kardian Mich. 0 Original 3737 1 D. Nutter 2567 8 K. Hanson Calif. 0 Grand Esprit 3734 2 R. Vandicrdonck 2522 9 J. Hiner III. 0 Cumulus 3709 3 J. Hiner 2469 R. Smith Calif. S Windfree 3670 10 SPEED TEAM STANDINGS 1 H. Stock 1000 PLACE TEAM STATE POINTS 2 D. Burt 975 3 D. Hartman 808 1 Greater Detroit Soaring and Hiking Society Michigan 12530 2 South Bay Soaring Society California 10351 STANDARD CLASS 3 Harbor Soaring Society California 10287 4 Bay Bombers California 9403 5 SOAR Illinois 9098 PRECISION SCALE 1 J. Donelson 1960 PLACE NAME SAILPLANE POINTS 2 J. Walters 1900 3 M. Smith 1480 1 Bob Andris Slingsby T-53B 5074 DURATION 2 Bob Thacker Kestrel 4864 1 M. Smith 2452 3 John Donelson PhoebusC 4620 2 S. Miller 2304 SPECIAL AWARDS 3 R. Smith 2163 Best Technical Achievement Award Bill Wargo: Winch retrieval apparatus. SPEED Best Original Design Ray Vandicrdonck: Nimbus Best Monokote — Doug Munn: Intrepid 1 B. Pell 762 Best Junior Achievement Yoshinori Sato: From Japan, 8 years old. 2 J. Simpson 684 Best Performance by an American Kit — John Donclson: Windfree 3 M. Smith 678

52 The MODEL BUILDER fliers; Heithcckcr, Smith, Vandicrdonck, Donelson and Rick Walters. Vandicrdonck, Smith and Heithecker were all called to fly their duration round together. CD Dan Pruss was accused (in FOR T H A T jest) of staging this, but he said, “ Honest guys, it just worked out that way.” All found good thermals in different parts of the field; Ray o ff the line, Mark slope soaring o ff a tree (honest!) and Otto way out over the trees. Watching Otto fly is a real experience. Here is a man who not only jumps up and down while he is flying but also talks to his sailplane GRINDING JOB (named Snoopy because of the dog in the cockpit); he literally talks his sailplane down into the landing spot. When all was done Vandierdonck had stayed up for 9 l/2 minutes, about 1 1/2 minutes GRIER ABRASIVE CO. INC. longer than Smith and Heithecker, to 1129 E. 74TH STREET win with a total of 4722 points out of a possible 6000. CHICAGO, ILLINOIS 60619 The scale event was somewhat o f a disappointment in that only 6 sailplanes were entered, all from the west coast. Bob Andris won the event with a m ulti­ to contact is Remco Mfg. Co., P.O. Box ing Miskeet designer Harley Michaelis’ colored military Slingsby T-35B. Scale 22414, Denver, Colorado, 80222. latest sailplane, “ Spirit of Freedom” . was judged on Sunday by the same OVER THE COUNTER Span is 118 inches, area 723 sq. in., judges who later judged Free Flight Williams Bros, has released the Mark flying weight around 3 pounds. Partial Scale at Glenview. Flight tasks were one II Twist Lock Spinner. The most im­ kit for $25.00 includes fiberglass fuse­ round each of precision, speed, and portant feature, o f course, is that they lage, spruce spars and parts-pac. Send duration, all flown on Tuesday. may be used with electric starters, in 24 cents in stamps for details on this, Bob and I had discussed the scale either direction. The back-to-front coup­ and other fiberglass kits available from rules with Dave Platt earlier, and it’s ling method also allows removal or instal- Hartman. obvious that there is some disagreement ation of the front cap without the use * * * about the current rule. A lot of o f tools, and there are no screws or The Mini-FAI free-flight model fea­ emphasis is placed on flying, as the holes to mar the appearance. tured as a construction article on pages flight tasks are flown right along with The spinners are available in red, 20 and 21 of this issue requires the use the non-scale sailplane. One argument yellow, blue, black, white, and orange of a special backplate for the Cox .010. is that, by doing so, a lot of types of in all 8 sizes, ranging from 1/2 inch at The backplate eliminates the bulky tank- aircraft arc eliminated from being a 95 cents to 3/2 inch at $5.45. The mount supplied with the engine, permit­ competitive scale subject, for instance 3/2 inch size only is available in a ting a slimmer and trimmer fuselage. low-performance gliders or World War II choice o f P-51 or P-40 type. The M ini’s designer, Loren Williams, troop gliders. These types would not be * * * is producing these plates in black ano­ competitive in a speed task, for instance. Vic Cunnyngham, Jr., well known dized aluminum for both the .010 and Bob’s T-53B is an excellent example of west coast free flightcr, and president .020 Cox TD ’s. Price for either size, selecting a good subject tailored to com­ of Progressive Sales, P.O. Box 474, including stainless steel flat head mount­ pete with existing rules, a simple Charter Oak, Ca. 9 1722, is the man to ing screws, and postage, is $5.50 each. design with scale aspect ratio, plenty of contact regarding that great "Super Order from Loren Williams, 729 W. room for cockpit detail and a good flyer. Glider” . This is a high performance Anaheim St., Long Beach, Ca. 90813, All in all it was a fine meet, with nose- hand launch glider featuring styrofoam and allow two to three weeks for to-nose competition and good sports­ wing and stab, tapered hardwood boom delivery. manship. The team championship was and molded nylon nose. ♦ * * a big hit this year, 18 teams being entered One glance at this glider, and parti­ Tatone timers are back! After being from all over the U.S. I guess it was cularly the instruction sheet, and you’ll o ff the market for about a year and a fitting that the Greater Detroit Soaring know that a knowledgeable H.L.G. man half, the “ Tick O ff” and "D - T Tick and Hiking Society should win it, as their has been instrumental in its design and O ff” are again being made. The "Flood- club was represented by some 25-30 marketing. The $1.29 "Super Glider” O ff” units will follow later in 1973. fliers. has already sparked a “ commercial The new timers feature selected brass “ Just wait ‘till next year, you mid- H.L.G. event” by several California F/F gears, black anodized steel pinion shafts, westerners!” · clubs. and brass bearing plates. The main soring Vic invites inquiries from dealers, is heat treated clock steel. workbench . .Continued from page 7 wholesalers, and representatives. The fuel shut-off time runs from 0 to number o f Old Timer model airplane * * * 30 seconds, weighs 3/4 oz., has a dial enthusiasts, the demand might be high Dwight Hartman, of Hartman Fiber­ to indicate length of engine run, and a enough to rate action. The company glass R/C, Argenta, III. 62501, is offer­ positive acting ON-OFF switch. It em-

The MODEL BUILDER 53 in. He noticed later that the plane tended to sink when the gear retracted, so I guess he just did it too low. Tony Dowdeswell crashed his back-up plane in the next heat to complete a terrible first round. But this was nothing. There were still three rounds to go. To show how great Sunday was, I flew seven heats, won six, and ended up with only 12 points. Incidentally, after Larry flopped in from the quick retract he changed props and finished fourth with a blazing 5 :15.0! In the second round, Jeff won again and Larry beat Whit. In that heat, Larry never got a light at No. I and Whit had two cuts, so we chose to rerun the heat to give Whit another chance. When it λ SOLING-M. Scaled Irom the exciting 3/ e ) SANTA BARBARA ONE DESIGN. new Olympic-class three man keel boat Length 50 in., More than five hundred sold and = 10 can still beat was rerun later though, Whit did the same mast 60 in., sail area 800 sq. in., displacement 18 II» For ^500' Length 70 in., mast 72 in., sail area HOOsq. in., American Model Yachting Association 50/800 "M " class thing as Terry at the No. 1 (pointing) racing. Prefinished fiberglass hull and deck, machined displacement 28 lb. Prefinished fiberglass hull, deck, and crashed, with Larry still first. cast-iron k e e l...... S I25.00 cabin and keel . S145.00 I won my heat, but it ended up that

BOTH KITS include finished Dacron® sails, spruce spar blanks, stainless rigging, brass fittings, and die-cast the guy who finished third didn’t get a aluminum rudder For two- or three-channel r/c operation w ith the Vortex sail control unit light on his last lap and we all had to rcfly. On the rerun, Richard Nichols flew up underneath me on takeoff and SAIL CONTROL UNIT his prop broke my stab so that the with gel/cell® battery and elevator was the only thing holding charger . . $75.00 it on. I landed and we fiberglassed it back together. It ’s a good thing I was SEE YOUR 210 East Ortega Street oversize in area, because I lost more than Santa Barbara. Calif 93101 HOBBY DEALER Telephone (80S) 963 1636 3 sq. in. from the leading edge of the stab. We reflew and I won again with a 1:54. ploys the pinch tube system, and comes and Korpi. Doug got two cuts and with a length of special surgical tubing; Gary had radio problems and had to Violett raced Mann in round 2 and price is $5.75. land. It ended up that all of his problems Mann got two cuts at Number I. You The D-T timer runs from 0 to 6 min­ were caused by the battery pack, which won't believe this, but the British put in a protest afterward that. Mann’s utes, weighs 7/8 oz., has dial selected had been jammed too tight into Paul flagman was flagging late and therefore time, positive acting release, and ON- White’s design. If the rest of us hadn’t they had to anticipate, which caused OFF switch. Price is $5.75. been having so many radio difficulties, the two cuts! The CD decided to rcfly * * * Gary probably would have discovered the the heat, but we got together, and D.J.’s Multi-Stripe is the material you problem on the test flights. Jeff and I wrote up a protest against the protest! should ask for the next time you plan both won our heats. After a lot of hassling, the British to decorate a model with colored stripes Allan Mann and Terry Prather then dropped the matter and things stood in 1/16, 3/32, 1/8, or 1/4 inch width. had a real close heat with Mann barely as they were. Korpi, using his back-up Literally like having a printed stripe winning at 1:47. The only problem plane, raced Phil Greeno and was beaten. coming from a roll instead of a bottle, was that the officials did not flag the We knew by then that the British had D .).’s Multi-Stripe is colored P.V.C. finish of the race so neither of the pilots to make mistakes for us to do any good. material with a pressure sensitive adhe­ or the spectators knew when it was over! Mann and Greeno were just as fast as sive on one side. Terry and Allan kept racing, and on the Violett, and six other British were Flighly conformable, the .2 mil thick 12th lap Terry crashed coming out of almost as fast, with HP's. Our engines stripe will follow most any contour. No. 1. We found out, from later inci­ sounded sick compared to theirs. Curing takes place in three to five hours dents, that this was caused by pointing I won my next heat in Round Three, of exposure to the sun’s ultra-violet the transmitter toward the No. I pylon. but again the lights didn’t work for the rays and once accomplished, the stripe (Manufacturers have warned fliers not third place guy and we had to rcfly. They is on to stay, will not fade or crack, can to point antennas ut planes in flight. switched to flags and I won the heat be rubbed down just like a painted Under normal conditions it's probably again. stripe, and is fuel resistant. OK, but where things are dubious, as Jeff had to race Mann, Korpi, and Contact D.J.’s at P.O. Box 41105, in this situation, it's better not to Whit. They hadn t rcflown W hit’s second Los Angeles, Ca. 90042. Dealer and point. T'ain'tpolite, anyhow WCN) round heat yet and he switched to Terry’s Distributor inquiries invited. Φ Larry was in the next heat and didn’t engine. Korpi put a new battery in his get started. "Pressing on regardless,” and Number I airplane and barely beat Mann Dear Folks . . Continued from page 41 taking advantage of the 6 minute rule, with a 1:46.3. Jeff got hit twice by the radios. We got nine hours sleep he finally got o ff after everyone had gone interference coming out of No. 1, so that night and were ready to race. a lap. Flowever, he retracted the gear The second heat on Sunday had Doug right after takeoff and the plane bellied Continued on page 56

54 The MODEL BUILDER MODEL AIRCRAFT OPERATING STANDARDS

a. Exercise vigilance for full-scale aircraft (get other people to help DEPARTMENT OF TRANSPORTATION if possible) so as not to create a FEDERAL AVIATION ADMINISTRATION coll ision hazard.

b. Select an operating site at a suffi­ cient distance from populated areas to avoid creating a noise problem or a potenti al hazard.

c. Do not fly higher than 400 feet above the surface. 1. PURPOSE This advisory circular outlines safety d. Do not operate closer than three standards for operators of model air­ miles from the boundary of an air­ craft, and encourages voluntary com­ port unless permitted to do so by the pliance with these standards appropriate air traffic control facility in the case of an airport for which a control zone has been designated, 2. BACKGROUND or by the airport manager in the case Attention has been drawn to the in­ of other airports. crease in model aircraft operations, and the need for added caution in the e. Do not hesitate to ask for assistance case of free-flight and radio-con­ in complying with these guidelines at trolled types to avoid creating a noise the airport traffic control tower, or air nui sance o ra potenti al hazard to ful I - route traffic control center nearest the scale aircraft and persons and property site of the proposed operations. on the surface.

3. OPERATING STANDARDS

Modelers, generally, are concerned about safety and do exercise good judgment when flying model aircraft. However, in the interest of avoiding un­ due criticism from affected communities and airspace users, compliance with the following standards is encouraged by operators of radio-controlled and free- flight model s

The MODEL BUILDER 55 NOW AVAILABLE! MIDI-PEARL AB-FAI

BILL CHENAULT'S LARGER VERSION OF THE FAMOUS M IN I P E A R L

* MEETS FAI POWER RULES (4TH PLACE FAI OPEN. 1972 NATS!) * FOR HOT 15 - 23'S IN UNLIMITED AMA CONTESTS (3RD PLACE U.S. FREE FLIGHT CHAMPS. CLASS B) * 18 26 OUNCES, 450 SQUARE INCH WING AREA * SUPERIOR BALSA, COMPLETELY MACHINE CUT TO YOUR PERSONAL SPECIFICATIONS. (FAI OR UNLIMITED) * NOT AVAILABLE IN HOBBY SHOPS. ORDER BY DIRECT MAIL ONLY. PRICE. POSTPAID. S13.98 * SEND CHECK OR M.O. TO: 111 & p ENTERPRISES 1222 BRIARCOVE DRIVE. RICHARDSON, TEXAS 75080 ATTN: DICK MATHIS

Whit beat him and had to settle for feet o ff the ground alter takeoff. Both feelings generated which may last a fourth. planes just got tangled together and while. They didn’t catch Bob’s cuts Next came the heat which changed spun into the ground. Larry’s lusclagc and gave him first with a l :4 I and Greeno the whole contest, they had pylons was ripped in half, but we managed to a zero. The British protested but the which were twenty leet high, and one epoxy it back together. The wing had FAI jury upheld the results. We felt flagman lor each pilot at the Number to be epoxied to the lusclagc and held the heat should be reflown but Bob Two and Number Three pylons. Larry on with a string because everything made sure the results stayed. A t this knew he had to fly tight so he flew low, wasn’t dry when he went out to the point, Jeff was only one point out of sometimes only I0 feet o ff the ground, line for the next heat. Talk about second with one round to go! which had the flagmen on their faces. micky mouse, this was it! We all got firsts in the 8th round. Larry had two cuts and Grecno won it, I raced Korpi, Doug and Pilsworth Grecno had to fly the last round three hut the CD decided that that type of next. We agreed before the race that times when twice there were mid-airs. flying was too dangerous and made up Doug and I would not finish ahead Fie still won. a rule on the spot that any plane flying of Gary because he was tied with Jeff Pillsworth forgot logo out to the line below the lop ol the pylons would be lor third. Gary chipped his prop on and missed the last heat. The engines disqualified! So in the fourth round takeoff and became a load so we didn’t were started when he got out there but I won my heal but when I passed the know what to do. Doug finally decided they wouldn't let him race. He was second place plane I went below the the only course was to cut the Number I quite upset, since that heat could have Number Three pylon and was disquali- pylon and I accidently followed him put him into 6th place. ilied. I don’t think I have to tell you since I was right behind. A few seconds RESUL IS how mad I was. later Gary had to land when all of his l Violett U.S.A. Tigre I 41 They disqualified Peter Pillsworth in aileron hinges vibrated out and he could 2 Greeno England HP I 47 this round too, so the British and Ameri­ only fly on rudder. Pilsworth won, Doug 3 Jeff U.S.A. K&B I 53 can teams both put in written protests was second and I was third. (I couldn’t 4 Wall England HP I 53 that night to the FAI jury, but the rule fly 2 and 3 worth beans up high.) 5 Beaumont England HP I 57 stood as is. Jeff and Larry both won Round Seven had the battle for first 6 Korpi U.S.A. K&B I 46 their heats this round. place between Greeno and Violeti. They 7 Griffen England HP 2 01 My Hying went to pot on Monday, all got started but C lili stuck his hand 8 Smith U.S.A. K&B I 54 having to worry about how high I was. in the prop while adjusting the engine. 9 Nichols England HP I 58 Also, whenever I came near to pointing A change ol propanda blood transfusion 10 Leonard U.S.A. K&B I 50 the transmitter at the airplane, I got later, they got it started and the race was bombed by up glitches. My lirst heal on. Grecno was just as last as Violett, was against Grecno, Telford, and Jeff. but on the second and fourth laps had R/C Nats . . . Continued from page 18 Clifl crashed when a servo went on the big cuts at Numbei I, which they didn’t while all frequencies in Block B, Pattern, blink and Larry called two big cuts lor flag! Then Violett barely flew inside the arc flown at the other. A t a point mid­ me. We couldn't come close to catching Number I twice. This time the cuts were way through the period, all flying stops Greeno and Jeff came in second. called! The American pits about came and then Scale Block B and Pattern I came in second against Violet! in the unglued. Finally, on the tenth lap, they Block A can be flown simultaneously. next round and Jell was hall a lap in called a cut on Greeno on Number 2 and It may sound complicated, but when it’s the lead when he cut the Number 3 and he then cut Number I on the eleventh all layed out on charts and flying lists got a second. Larry, V ioleti and Pills­ lap. arc made up, it falls nicely in line. A worth raced in round live and Larry and When the official results came in, last-minute juggling of the Scale flight Peter had a beautiful mid-air about 15 though, I ’m afraid there were some bad lists caused the error.

56 The MODEL BUILDER In the second incident, one line of Pattern linalists, as usual, was running faster than the other, and consequently Qu*rfc\ Hídýil - O j 5c filt - $jpont the flyers finished their round before the others. Officials should have made the faster line wait for the slower line to finish before going on to the next round. By noi doing this, they allowed the Features first man up on the fast line to turn on Glass Spar Wing while a man on the slow line was still All Balsa Construction Fred Reese’s Formed Canopy in the air. In this particular case, Fiberglass Cowl though not necessarily inevitable, the Detailed Instructions Sh&eAt/Ung, two were on the same frequency. Plans. Three Views Wing Decals Total Weight Area 302 or 310 in sa Zap! Again, it was human error, NOT 2-1/2 lbs Span 35 or 37 in a breakdown in the system. Fuselage Thickness 10% — 1 m Root We have heard and read comments Height 5-1/8 in. Engine Width 3 in 0 15 R/C Price S32.95 to the effect that frequency pins would have prevented both errors. Probably See your local dealer first so, but can you imagine the delays and Distributor and dealer inquiries invited California resulting loss of flying lime while fre­ residents add 5% tax Sorry, quency pins would be shifted,exchanged, no C O D 2814 East 56ih Way. Long 8 each CA 90805 forgotten on antennas, and run back and forth almost a quarter of a mile be­ position, final score 197 1 inal position frontal side area and weight in the eight tween the two sites? anc final score , and 1970 final position. pound range. Webra’s pulled 14 ol the We mentioned a “ iast” , and this of 1 Chidgcy 855 835 7 finalists, most used Top Flite power course would have to be the Navy sup­ ( i) ( 1) 2 Whitley ( 2) 845 (10) 785 4 props 11-8 or II-7 Í!, and Silenceaire port that we have leaned on in the past. 3 Coleman (13) 840 ( 2) 826 6 dominated the muffler department. However, another “ first” came as a 4 Page ( 3) 831 ( 4) 819 8 Retract gears are now as much a part result of the "last” . For the first time, 5 Kirkland 822 816 1 of pattern competition as the planes officials not only did their usual jobs of (ID ( 5) 6 Kraft ( 5) 816 ( 7) 814 3 themselves. We don't recall a single running events, they also did the hard 7 Martin ( 7) 814 825 9 finalist with fixed gear. The pressure, labor formerly handled by the Navy. ( 3) 8 Penrod ( 4) 813 (13) 775 if you'll excuse the expression, is on If you want to know how to put up and the gear manufacturers to make their 9 Helms ( s) 809 __ take down several miles of snow fence, 10 Bonelti ( 6) 808 783 10 units as fool proof as possible. An out- just ask one of the guys who was also (ID I I Buck (10) 807 _ of-trim airplane, an engine going rich or judging flights, or calling contestants, or 12 Brooke (12) 806 ( 7) 800 lean in the air, or a "g litch y" radio, can tabulating scores, or operating the flight cause loss of points in maneuvers, but a 13 White (14) 806 ( 9) 790 lines, or punching stop-watches, or wav­ collapsed landing gear results in a zero 14 Brown (15) 804 — _ ing flags, or spending hours in the for landing and spot, potentially a loss 15 Bridi ( 9) 786 (15) 773 _ “ Scale Cage.” o f as many as 20 points. Failures, how­ 16 Lowe (18) 782 ___ 1 1 Anyhoo, getting back to Pattern, the ever, seemed to occur mostly in Scale, 17 Leonard (17) 775 (14) 773 5 results of the Class C Finals arc always probably due to the excessive weight 18 Barry (19) 763 — __ sort of interesting to examine. O f the of the models and the generally rougher 19 Hotelling (16) 762 — — __ lop twenty finalists, 14 were linalists in landing performed. 20 Agee (20) 758 (16) 766 — 1971 and 10 of these also made it in Ten Pro-Lines made the top 20, in­ 1970. New faces in the lop 20 this year It is interesting to note the compari­ cluding the first lour positions, as well were Steve Flelms, Steve Buck (both from son between qualifying and final posi­ as 7, 8, 9, I I , 12, and 20th. Kraft, Phoenix, Arizona), Dave Brown (Mason, tions. For the most part, flyers re­ Bonetli, Leonard, and Barry used Kraft, Ohio), Marty Barry (Vista, Ca.), and mained fairly consistent in relation to while Kirkland, Brown, and Lowe Hew Ed Hotelling (Camarillo, Ca.). each other, with the exception of Cole­ World Engines equipment. Bridi and The south and west still dominate, man, Kiikland, and Bridi. Coleman is Hotelling operated S&O (Salkowski & probably due to the year-round flying consistent in his own way, however. Oddino) units, and Ted White had his jonditions; nine from the west, six from This year he jumped from 13th to 3rd own Galaxie. Sixteen of the above were he south, three from central states, and and last year he moved from I Oth to on 6 meters. iwo from the east coast. 2nd. Must take Don a little while to Class A & B patterns were flown As the old saying goes, “ Save your work up a head of steam! simultaneously on Sunday morning, and Confederate money, the South will (and |oe Bridi's consistency works against it’s a shame that all Nats R/Cers couldn’t did!) rise again.” The top three winners him . . . consistently. In both 1972 have been there to watch Steve Brooke, (if you don't know, through the fastest and 1971, he qualified in 9th and fin­ Ralph’s eleven year old son, doing 8,9, grapevine in the world, by now, you ished in 15th! Actually, Joe doesn’t and 10 point maneuvers, one after ano­ must really live in the “ boonics” ) were fly worse in the finals, it’s simply that ther. It was sort of a funny sight, but RonChidgey (Pensacola, Fla.), |im Whit­ guys like Coleman squeeze him down also a real kick, to watch the Brooke ley (Decatur, Ala.), and Don Coleman as they move up. There oughta be a clan before any ol Steve’s I lights. As (Citronelle, Ala.). law . . . ! the plane moved from Ready Box 3, to The top twenty finished as follows, Many of the airplanes showed some Ready Box 2, then to No. I , Ralph and and after each name is their qualifying European influence, with large fuselage Jean would gel more and more nervous,

The MODEL BUILDER 57 the trend, in recent years, has been toward the more conventional configu­ ration of single engine monoplanes, so it was nice to see Tom Cook’s B-17 and Bill Bertrand’s Handley Page, four en­ gined bombers from WWII and WWI, respectively. Tom placed eighth, and also won the Best Flight Achievement Award. The Fortress, though unscale­ like in flying speed, nevertheless sounded bcautilul with its four Wcbra .20’s roaring away. Bertrand’s Flandley Page was more scale-like in the air, but had problems getting o ff w ithout going through some fantastically rapid ground loops. Joe D'Amico was back with his Mar­ son (III.), and |oe Hildreth (Ark.), all tin B-26, this time with retract gear, Open flyers, and also earned the Best which, in spite of relatively soft land­ Senior trophy for Class B. ings, continued to suffer from nosegear Class C Novice awards were based collapse. on the C Qualifying scores, with Ed In the winner’s circle, Bud Nosen Hotelling way out in front (enough to reversed last year’s problems by dam­ qualily in the finals fly-off). Rhctt aging his beautiful SkyraideroT/e/· getting Miller, who placed second, also won in some official flights, thus capturing the best Junior trophy. Third, fourth, first place. and fifth were taken by Kim Johnson, Walt Moucna putt-putted around with Don Sobbe, and Ernie Weiss. Inci­ his World Championship Scale entry dentally, Rhctt Miller loaned his Kirk­ Fly Baby to earn second place. The P o w e r P a c k e d land designed Intruder to Jim Kirkland Pete Bowers designed homebuilt is very alter |im ’s plane was wiped out in one realistic in the air and Walt does a nice P e r f o r m a n c e of the aforementioned frequency mix- flying job. ups. Ed Ellis has a thing about old Ryans is what the Pfingst hanging motors offer, SCALE: R/C Scale and Pylon are and it apparently pays off. He took by combining high RPM (14,000 idle) always the biggest spectator shows at the and high torque (1/15th HP). first and fourth in 1970 and 1971 with Nats, and though we didn’t actually the Spirit of St. Louis, and came back Add to this: count feet and divide by two, we’re this year to win 3rd place with the Swiveling wall bracket; flexible shaft over three feet long; snap-on, slender, pretty sure scale drew the larger crowd. Ryan M2 mailplane. As with the cool-running handpiece, which accepts Among those present was Paul Harvey, Spirit, the M2 has no dihedral and a Dremel bits and makes working in tight who has plugged the hobby many times areas easy; entire unit guaranteed and small stab, but at least appears to fly fully serviceable; a price tag of only on his nationally heard radio news with a fair amount of stability. S52.00, which includes shipping; and broadcasts. Paul is an active R/Cer, Don Botteron’s fourth place finishing you have found the tool you've always and like many others, stayed lor a lull wanted. Destined to become the most Zlin Akrobat, built from the Sig kit, is ACTIVE partner in your shop. day of scale Hying. already well known from Hobbypoxy In general, the scale fidelity qualily ads and the article Don prepared for Order from: has improved a great deal, with credit American Modeler on applying the epoxy BRAVE PRODUCTS due to Dave Platt for having broken finish with a brush. The paint job is 79 Adirondak Ave. the line with his “ weathering". Prior truly beautiful and should encourage Spotswood, New Jersey 08884 to the appearance ol Dave's SBD in those who can’t go the additional cost of Dealer inquiries invited._____ Olathe, 1968, scale ships were mostly a spray unit. unrealistic looking polished jewels. Ralph Jackson, a long time veteran pacing around, wringing hands, and wip­ Incidentally, Dave’s Dauntless made ol Nats R/C Scale, brought a "W hat’s ing brows, and all the while, Steve was its last Nats appearance this year, as it That” airplane to the Competition. The standing there as calm as a drug store now occupies space in the U.S. Naval low wing, single engine private plane indián. Aviation Museum, NAS, Pensacola, Flor­ looked a little bit like most every air­ Steve went on to win Class A (|, S, ida. It was actually committed to the craft of its type that you’d see at any O), by a wide margin, over Bob Plattcter museum prior to the Nationals, but airport, but the name had a way of (Senior), Don Gutridgc (Open), Reuben Dave’s other project, a ducted Ian ship, causing a double-lake to nearly all but Tyson (Open), and Gary Anderson was not ready in time, so at the last the most informed individuals: Win- (Open), and quite naturally also took minute he entered the SBD. Bob decker Eagle. home the Best Junior Trophy. Boh Blaikie, exhibits specialist lor the mu­ Just outside of the winner’s circle Plalteter won Best Senior. seum, was a very nervous spectator as were; Claude McCullough’s Shinn 2150, Ellis Newkirk, a Senior Irom Nash­ Dave made not one, hut three flights which won Sterling’s Best of All Scale ville, Tennessee took first in Class B by to qualify and place seventh in the Award; Dave Platt’s Dauntless; Tom a clear margin over Mark Smith (III.), competition. Cook's B-17; Bob Underwood’s Bonzo, Jack Poppcnhager (III.), Leland Peter­ With Might points counting so much, Bertrand's Handley Page; Bob Karlsson's

58 The MODEL BUILDER very popular F4-U featured on our cover; Joe D’Amico’s B-26; Bud Phillips' Lockheed Orion; Dick Graham's EAA QMudspieí! JAodás award winning Liberty Sport ; and others. Over thirty in all. Scale still has its traditional prob­ lems, the unllown or untested models, the flyers who almost ol necessity spend much more time on building than devel­ oping their flying skills, and the contin­ ued over-spectator flying. But what really bugs us the most is to see an “ unpiloied” model in action. Damn it all, if these are really scale models, then there ought ot be a pilot in the "o ffice ” whenever the plane is in motion. Grant­ ed, you can’t distinguish features of pilots in full scale aircraft unless they taxi up close to you, but you can usually see that somebody is at the controls as the plane taxi’s out, takes o il, lands, and taxi’s back. Each Kurwi 68 Deluxe Kit Features: The amount o f realism added to Dave * FULLY FORMED, DURABLE, FIBERGLASS FUSELAGE. Platt’s Dauntless by having pilot and * TAPERED LEADING EDGE & TRAILING EDGE STOCK CUT crew aboard is very noticeable. And to FROM GRADED BALSA FOR WINGS & STABILIZER. us, it's also very noticeable, almost MACHINED DURAL WING & STAB TONGUES, FOR spooky, to see Nosen’s Skyraider taxi BREAKAWAY ON IMPACT. FULL FLYING STABS. to the “ hangar” and stop, to see the * WING SPAN - 140"...... WEIGHT - 4 lbs. canopy slide open without the help * KIT IS EASILY BUILT - 85% PRE-FABRICATED. of human hands, and then sec that no­ * COMPLETE DELUXE KIT - $65.00. body’s there! Available Only From: We’re not asking scale contestants Windspiel Models to go out for sculpturing lessons, or to 3704 Montgomery Dr. Santa Rosa, CA. 95405 Shop Phone (707) 544-2334 storm Williams Brothers for plastic pilots (Down, Granger! Down, Larry!). Even ft.) Wade team. a profile would do. In fact, the pilot Designing aircraft for the ASTRO- Over on the Carrier deck, things were should not be judged nor need “ it” be at 25 power plant is easier than for the buzzing as Harvey Dickinson won Jr. the controls for judging, but by golly, ASTRO-10, since the allocation for Profile. Sr. Profile went to Bob Wright a simulated pilot of some sort should be aircraft structure would normally be and Open was held by Harry Higley. required in scale models when they arc much larger. The ASTRO-25 set an un­ Class I was won by Bob Sawicki in J r., in action . . . unless of course the model official world distance record of 19 1/2 Terry Herron in Sr., and Ray Willmann is of a full scale, 100 percent, radio miles on February 5th, 1972, powering in Open. )unior Class II was Bob controlled, target drone. There’s always a Fournier R1-4 with an all-up weight Sawicki again, John Gerber in Sr. and a way to get around most anything!!# o f 6 1/2 pounds. While this aircraft had James Finley in Open. a structural weight allocation about that Sunday was FAI Team Race day. electric .... Continued from page 43 equal to the Spirit of St. Louis, the same J.E. Albritton was the winner followed tions for performance of the Midwest aircraft flown with the standard nicad by James Vansant and Dick Orsterle. Cardinal. From Figure 1, a power of batteries weighed 5 pounds, and had a A model aircraft flying demonstration 20 watts was required at the 4 foot structural allocation of 35 percent. Table completed this year’s Nats and was a wing span and 3 pound weight. Dou­ 2 compares the performance and weight crowd plcascr as usual. bling this minimum power to obtain a breakdown of these three aircraft. With See you next year at where ever reasonable climb speed and subtracting a 35 percent structural allowance the the '73 Nats arc held. Until then, keep the resulting 40 watts from the power ASTRO-25 power plant should easily ’em Ilyin’!· · available from the Astro-10 power pack, power a wide variety of commercially Report on C/L sluň I only, by Burl leaves 35 watts of climb power. Again, available kits. · Kiapinski: referring to the upper portion of Figure • Repeating last year’s duties, Dick I, it yields a climb rate o f 290 feel per C/L ...... Continued from page 25 Williams (Kansas City, Mo.) and I were minute. Straight and level performance Third place went to Henry Graef after the event directors, and for those who is obtained by noting that the 75 watts losing a hotly protested decision to have never run an event at a regular of power available from the Astro 10 Vcrnaw. meet, le.t alone the Nats, it is quite an is 3.7 times the minimum power required C Speed saw Glen Vansant, Charles experience, to say the least. As anyone and noting that the aspect ratio is about Schubert, and Glen Lee, win 1st in Jr., who was at the Nats can testify, the 6 to I, offering a level flight speed of Sr., and Open respectively. First and Naval Reserve did not supply the man 2.3 times the stall speed, or about 55 second in )ct Speed went to the Hoyt power they had in past years. Con­ mph. (Stall speed equals 24 mph at the brothers, Mike and Bill in that order. sequently all of the flying circles and maximum wing loading of 24.5 o//sq. Third place was awarded to Thomas/ pit areas had to be carefully marked

The MODEL BUILDER 59 ADVANCED f r o m PUSH ROD SYSTEMS

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tinue our operation. Tuesday evening, the Juniors brought SCALE INSTRUMENT KITS TATONE STEERABLE NOSE GEAR KITS in their planes for appearance judging. MODEL I I V,"« I Although stunt is a lough event for the ^22·,* a ο:·:ο:ο junior pilots, I was a little disappointed, ** · «/C BULKHEAD ENGINE-GEAR MOUNT as only nine entries were to show. Each kit contains six metal instrument cases, turned and MOUNT KIT plated. Six glosses and backs to fit coses. Twenty typi­ Flying began on Wednesday morning, cal instrument faces included. Complete witfc instruc­ Giv« name and MODEL II d»p of »ngin* I %"« tions, easy to install. $*|7S when ordering. and the weather was generally good with RIMDIA. 1/4 5/16 3/8 - 7/16 - 1/2 just a little wind in the afternoon. When $ 5 .9 5 e a c h i $ 4 .9 5 e a c h it was all over little Mark Bauer, from R/C HINGES "C LE A N - c u t " • Of 1UXI fUCWT NAMOCI Norridge, Illinois, came out on top with RAZOR BLADES W e rv~. im· V ^ T U u /! 324 points. Fie flew an original design e till«· bu«k».ngi on oil sown·« no molo· to molo* (on I or I “ Das Kraut” , powered with an ST .40. # Shock obtoib'-g ιΐη ιιη aim O Adiut'oblo Wnglli ·.·· gcu- The plane looked like an early German O "M WS9 on 43 74 ongmo mOv- Krt» tiKlwd· «II «ocoicory monoplane, was silk covered, and fin­ MODEL ouildinc A t A ll Leading Dealers ished with Sig and K&B epoxy. It •ITS 1 CRAFTS <,75 pkg. of 1 0 .. 59c 4719 MISSION STRUT spanned 52 inches and weighed 49 NO SCO TATONE PRODUCTS SAN FRANCISCO. CALIF. 94112 ounces. Propeller was a Rev-Up 1) x 5 7

/JJ-lPJeif-KM: NGlNt MOUNTS an OS .35 with Rev-Up 10 x 6 prop. CLASS SCAM LENOTH It ’s hard to believe that the plane 1/2A LONG OR SHORT ..$175 .09 SHORT ONLY ...... 2 25 standing on a wing tip was taller than .15 LONG OR SHORT .. 2.25 .19 LONG OR SHORT .. 2.25 Bob! •29-.40 LONG OR SHORT .. 2.50 .4S-.59 SHORT ONLY ...... 3.00 Third place went to Kenneth Stevens, .60 LONG ONLY ...... 3.50 .60 SHORT ONLY ...... 3 00 who hails from Lexington, Kentucky. $ 5 .9 5 ” 271 His Oriental, built from magazine plans, was powered by old reliable Fox 35, out according to previously drawn plans the fact that Dick and I had just a few using a Rev-Up 10x6 prop. His 55 inch and then tape had to be put down, as hours to work with the judges since span ship was finished with Aero Gloss the Navy requested that no permanent there were many smaller but vital jobs dope and weighed 41 ounces. He had marks be left on the runways. The that had to be completed, such as making a score of 267.25 points. really big job, however, was putting up enough score sheets, rounding up tables I hat famous Mother Goose character, what must have seemed like an endless and chairs, clip boards, tents, adding Chicken Little, had told me that on snow fence, particularly to those who machines (which was like trying to take Senior Stunt day, the sky would fall. did it. (Luckily Dick Williams and I gold from Fort Knox) and all the other (Goodness, Bari, you DID work loo were husy training the stunt judges.) small necessities. Without the valuable hard! WCN.) The chicken was right Γraining stunt judges can be a d illi- help ol Dick’s wife Donna, who not only as the sky did fall and almost washed cull task, as no one yet, in my opinion, helped with the vital jobs but also did us all away! I he last flight wasn't made has Mown the stunt pattern exactly as much more than her share in helping until 6:40 p.m. the book shows. It is rather difficult to to run the scoreboard and spent more Dennis Admisin has been working point to a maneuver in the book and then than a couple ol nights tallying scores . . . very hard on a V-tail design about which duplicate it in the air lor the judges! often until the wee hours of the morning many flyers wetc skeptical. Dennis Ihe main reason lor out d illicu lty was . . . we would not have been able to con­

60 The MODEL BUILDER proved them very wrong, however, as he placed 1st with a score of 489.25 points. His semi-scale Fouga Magister M/SS DALLAS jet had a wing span o f 56 inches and A FORMULA I RACER FOR THE BUILDER WHO WANTS THE BEST weighed in at 55 1/2 ounces. He had a Rev-Up 10 x 6 EW tied on the "go” Wing Span — 43.5 In. end of an O.S. Max 35. He used K&B Wing Area — 455 Sq. In. Weight — 5 to 5.25 Lbs. 100 fuel and the finish was Aero Gloss. In second place, with 488.5 points was Mike Jackson of Long Beach, Calif­ ornia. His 54 inch Tempest weighed in at 48 ounces and was powered by an O.S. Max 35. He uses Sig fuel with a Rev-Up 10 x 6 prop and the ship is nicely finished with Sig dope. In third place with 483.75 points was a fine gentleman by the name of Mike Thompson, who lives in Modesto, California. He flew a Gypsy, designed $48.00 by JimSilhavy. This very nicely finished All necessary hardware, plus . . . craft had a wing span ol 56 inches and • Formed top cover, elevator/aileron torque rods and landing gear weighed in at 63 ounces. It is powered J G M ODELS • Fiberglass cheek cowls and wheel pants by an O.S. ’40 which swings a Rev-Up • Individual foam core wings 909 N. 3rd St. • All parts machine cut 10x6 EW. He uses a Sig finish. Montebello, Ca 90640 Open Stunt saw a most beautiful Dl A U K AND DISIRIHUIOK INQUIRILS t\\ H ID array of planes, and it seems they get belter every year. This reporter was Finals day had the best weather ol the (Editor's Note: Better find out what’s pleased to see the wide variety of meet . . . and practically no wind. Bill going on in living, Texas, Bart. The products used in all entries. There were Wcrwage pul up an early flight which first three placers all come from there. all types o f planes, finishes, building temporarily moved him into 1st. Gene I f i t ’s the water, they ought to hot tie techniques, hardware and engines. Lew Shaffer flew shortly thereafter and took and sell it!) McFarland was using an H.P. 40 with over second place. I wasn’t able to sec Fourth place went to another veteran, muffler in his fine original Akromaster. most o f the flights and apologise lor Lew McFarland. Lew flew his own It seemed to run very well. not giving a better account. Akromaster which is powered by an H.P. The first day of Open Stunt was 40, with muffler, swinging a 12 x 6 prop. for qualifying, with the top six flyers AI Rabe flew a big ST .60 powered The wing span is 57 inches and it weighs from each of three circles slated to go Sea Fury which impressed everyone . . . 57 ounces. Lew finished his plane with into the finals. Weather was good, but it wound up in first place . . .Al did a Sig dope. beautiful job in building and finishing the wind in the afternoon, although not Gene Schaffer flew his "A ir Boss” to this complex airplane. The ship has a strong, was nevertheless in evidence. 5th place. He uses an OS Max 35 for 62 inch wing span and weighs 77 ounces. When the dust had cleared, the 18 power and a 10x6 Power Prop. His The ST sported a concealed muffler and finalists were: nicely finished model was painted with turned a 13 x 5 Rev-Up prop. The CIRCLE ONE Sig dope. His plane has a 54 inch wing plane also had a shock type landing gear I. Les McDonald 570^2 span and weighs about 43 ounces. which was in evidence during landings. 2. Bill Werwage 527/2 The lop ten finalists were: The Hobbypoxy finish was beautiful. 3. AI Rabe 5 1 8/2 1. AI Rabe 627.75 4. Gerald Soloman 450 In second place was a real veteran 2 . Bob Gieseke 625.75 5. Dan Shaffer 446/2 of stunt, Bob Gieseke, who flew his 3. Bill Rulherlord 624 6 . Pete Simonson 445 well known Gieseke Nobler. Along with 4. L.ew McFarland 605 Bill Wcrwage, Bob didn’t get in much 5. Gene Sehaf fer 601.75 CIRCLE TWO practice as their planes arrived just in 6 . Bill Wcrwage 600.5 I. Bill Rutherford 662/2 time from the World Championships. 7. Les McDonald 596.5 2. Gene Schaffer 659 Bob's Nobler has a 5 1 inch wing span 8 . Gerald Phelps 596 3. Bob Gieseke 628/2 and weighs a mere 39 ounces. He uses 9. Jim Silhavy 585.75 4. Frank McMillan 562 a Fox 35, Rev-Up 10x6, and I ox Super­ 10 . Keith T rostle 559.75 5. Lew Wollard 554 fuel. It has an Aero Gloss finish over Bob Lampióne riL 559.75 6 . Bob Svoboda 5 5 1/2 Japanese tissue. For Dick Williams and mysell I wish Although it appeared to have some to express out gratitude to those people CIRCLE THREE Rabe influence, Bill Rutherford’s 3rd who gave so much ol their time to help I . Gerald Phelps 571 place P-51 Mustang is an original. I he us. I would also like to congratulate our 2. Bob Lampióne 570/2 Mustang is powered with an S I .60, using American I Al C/L Stunt Team. They 3. JimSilhavy 568/2 a Rev-Up 13x5 prop. Wing span is won the Team Championship again this 4. Lew McFarland 563/2 55 1/2 inches and it weighs in at 59 year, and Bill Wcrwage took 1st place 5. Jack Sheeks 560/- ounces. Fie used Sig dope on his nicely honors lor the second time in a tow! It 6 . Keith Trostlc 552 finished plane. was a great teat by a great te a m .·

The MODEL BUILDER 61 r to make the best use of either the Perry or the Kavan. S tripe without SIMPLE CARBURETION AND CYL­ INDER CHARGING: PAINT A carburetor is a mechanical device r C F which provides a mixture o f fuel and air to the engine induction system. COLORED VIN YL STRIPING. The mixture is called the fuel/air ratio APPLIED IN MINUTES, LASTS and consists of about 12 or 13 parts 5 TIMES LONGER THAN PAINT o f air to one part fuel. When the ratio • PRESSURE SENSITIVE ADHESIVE. THREE TO is something like 15 parts o f air to one FIVE HOURS IN SUNLIGHT BONDS IT FOR LIFE TESTED AT 65°F TO *225°F part fuel, the mixture is said to be

• WILL NOT FADE OR CRACK lean. If the ratio is something like 10 parts air to one part fuel, the mixture •H IG H L Y CONFORMABLE. FOLLOWS ANY CON TOUR. SIMULATES PAINTED STRIPES. is said to be rich. The engine runs best when the mixture is slightly lean. • ONCE CURED. IT IS RESISTANT TO SOAPS AND DETERGENTS. ABRASION. MILD ALKALI. OIL. The induction system o f the Veco 19 GLO FUEL, PETROLEUM. GREASE AND WATER consists of the port into the hollow • DIMENSIONS: 0.2 MIL THICK BY 1 16. 3/32. 1/8, crankshaft, the volume o f the hollow 1/4 INCH WIDE. crankshaft, the volume of the crankcase,

•WIDTH TOLERANCES HELD TO t .001" the transfer passage, and the port in the cylinder wall which connects the transfer • COLORS: RED. WHITE. BLACK. GOLD. YELLOW. DARK BLUE passage to the cylinder when piston trav­ el uncovers the port. Shortly after the start of each upward stroke o f the piston, the crankshaft port opens under the carburetor. Pressure in the crankcase Oiif Model Clamp is the most versatile clamp m the Hobby World Can be used as a WING JIG New from our Eng Dept decreases as the piston moves upward, The CAP STRIP CUTTER A money saving Tool. Cut your own capstrips. Makes 1 4” and 3 16" strips from scrap balsa. MULTI-STRIPE which creates suction and causes atmos­ Model Clamps per bag of 5 ...... S 1.50 Cap Strip Cutter each S 1 95 pheric air to flow through the carburetor P. O. BOX 41105 ! Los Angeles. Calif 90042 Alum. Rwl 8” O D 5 8 " Centerhole each S20 00 and into the crankcase after passing Complete Elec Winch less Battery $97 50 dealer and distributor inquiries invited ROSC IND · 1190 N ROSC · ESCONDIDO · CALIF 92025 through the hollow crankshaft. Figure 1 illustrates one form o f a simple carburetor. Typically, the carburetor is R/C Cars . . . Continued from page 44 tions which accompany cither carburetor fitted with something called a venturi up to now have called for installation will be of some help (those with the to m ultiply the suction effect for better of the Perry 19 (40 or 60 by the engine Kavan unit will help to avoid confusing regulation of fuel flow into· the air wizards) or the Kavan units meant for it with a glow plug!) but the instructions stream. the Iront rotor Veco 35. The Kavan 35 say little or nothing about what a was the first widely used “ lifesaver” and carburetor is supposed to do. This article VENTURI PRINCIPLE remains popular today. is intended to provide helpful informa­ A venturi is nothing more than a Both the Perry and Kavan have a good tion about a few principles of carbu- restriction to air flow, but it is aero- approach to the problem. The instruc­ ration and to suggest some ideas on how dynamically shaped to minimize air turbulence. In accordance with a prin­ ciple o f gas flow, air drawn into the p ...... Ί carburetor increases in velocity and de­ creases in pressure as its path is narrowed . " FOR YOUR REAL ESTATE NEEDS " I progressively in the venturi inlet. Veloc­ ity hits its peak and pressure, therefore, is lowest at the narrowest part of the I CALL - WRITE OR SEE: ANITA NORTHROP venturi. Alter this point, the venturi widens, velocity decreases, and pressure increases. Figure 2 illustrates the venturi •RESIDENTIAL & INCOME PROPERTIES . principle. Although venturi inlet and outlet diameters may be the same, there •COMMERCIAL AND INDUSTRIAL I is a slight pressure drop across the ven­ turi. The mere presence ol the venturi results in more surface area exposed to I RES. ( 714 ) 544-1321 BUS. ( 714 ) 838-3443 ' air flow, which means greater friction and some pressure loss. To fully grasp the venturi principle, CENTURY 21 REAL ESTATE . necessary for an understanding ol basic carburetor action, look at the operation 1 18410 IRVINE BLVD. TUSTIN ,CAL.92680 in another manner. Tor example, consid-

62 The MODEL BUILDER FOR YOU GUYS AND/OR GALS GETTING STARTED IN R/C. TRY OUR NEW "WEEKENDER.” IF STAND OFF SCALE IS YOUR ORE ^ er that a column of soldiers must main­ WAY...... N O W THE tain a fixed rate o f march. Traveling four abreast, they encounter no d iffi­ SUPER culty until they come to a bridge that MINNOW is wide enough for only two soldiers BALSA DOES FLY BETTER...AND FASTER! abreast. To maintain the same rate of march - a fixed number past a given * 4 2 . 9 5 point in the same amount o f time - they must increase their travel speed while on the bridge. A t any point on the bridge, their number (air pressure) is less. Their speed (velocity) is greater, however. After crossing the bridge, the group / returns to marching four abreast, resumes F o rm u la the slower speed, and unless one or two WINNER fell (or jumped) from the bridge, the 1969 Nationals *Hi Speed Super Turn number is the same as before the crossing. 1970 Nationals Foam Wing Air pressure after the venturi in a •Formed Cowls with 1970 Las Vegas Molded Fillets carburetor is not exactly the same as •Molded Low Drag Canopy before entering, but the loss is negligible 1971 Nationals and Head Rest and unavoidable. (Still ties in to the •Custom Cut Sanded and JACK STAFFORD MODELS Select Balsa and Plywood soldiers, they’re tired after double-timing Parts across the bridge!) t2tt 1 BEATRICE ST. •Really Complete Drawings CULVER CITY, CA 90230 The Perry carburetor employs full Instructions and 3-Views principle of the venturi. The Kavan S13DQIW aaans · sadnooaiv q n v ■ * o o i saNvidie 3Av h 3m m o n a vo a n v H3TV30 anuoAVd anoA i y aa h i m carburetor relies more on the placement of the fuel discharge in an area of high the venturi at idle and low engine speeds, of flow increases, the density of the luel air velocity through the carburetor. especially with small displacement en­ remains the same as its rale of flow As shown in Figure 1, a tapered gines. The suction created isn’t enough increases. (Density is an expression of needle, called a needle valve, threads in to make sure of accurate regulation of the weight of a substance per cubic foot and out of a jet to provide adjustment fuel into the air stream. Typically, too of volume.) In other words, as the rate of the amount of fuel to be admitted much fuel enters for the amount of air. of air flow increases with opening of to the carburetor from the fuel tank. The mixture is too rich. the throttle valve, each cubic foot of air - The throttle valve position controls the The Perry carburetor provides a novel fraction of a cubic foot in the crankcase - amount of air flowing into the carburetor adjustment of idle mixture. The adjust­ becomes less and less dense. Because when the crankshaft port opens under ment consists of a disc which can be mixture ratio is a measure of the weight the carburetor. rotated a few degrees one way or the o f air to the weight of fuel, the effect When the piston has reached the top other from a theoretical best position. is that the mixture becomes rich. of the stroke and traveled downward Rotation of the disc increases or de­ The throttle valve controls only the a slight distance, the port in the crank­ creases the fuel flow received from the rate of flow of air, it can do nothing shaft closes under the carburetor. The needle valve assembly. A t medium and about changes in the density of air. mixture now trapped in the crankcase is high speeds, the disc has no effect. For Consequently, without other adjust­ compressed more and more as the piston these speeds, the mixture ratio is set only ments, the tuner of the Perry or Kavan continues its downward travel. Finally, by the needle valve. carbureted R/C engine must set the the piston uncovers the exhaust port, The Kavan carburetor provides an needle valve to stay lean enough when the and then, the intake port. Exhaust gas adjustment which increases or decreases engine speed is very high. This probably escapes out one side of the cylinder while a flow o f "un-metered’’ air into the means that the mixture will be too lean new mixture rushes in from the other engine. This air is taken from outside the at medium speeds, and this can have a side. carburetor, sent past the tip of an adjust­ bad effect on acceleration. able screw sticking into a drilled passage, A FEW PROBLEMS AT LOW SPEEDS Carburetors for passenger car engines and enters the mixture stream after the usually have an air bleed system to Simple carburetion discussed thus far point o f fuel discharge. Effectively, correct for the problem. The fuel is workable when engine speed doesn’t according to Kavan, this method leans passage at one point inside the carburetor change. In fact, shaft-valve engines, such the mixture at idle and low speeds. is exposed to the ram air pressure which as for U-control, have only a venturi The method is popularly referred to as exists in the carburetor inlet. The section which is located above the crank­ an “ air bleed” . Unfortunately it isn’t. effect of the air bleed is to successively shaft port fitted with a needle valve If either the Perry or the Davan really reduce the flow ol fuel in proportion to assembly. But for car racing, a throttle had an air bleed, a big problem facing surface in the carburetor inlet. valve is required for engine speeds engine tuners would be solved. The Some model-engine carburetors have through the range from idle to top problem is caused by an important an adjustment for mixture ratio at me­ speed, and there must be an adjustment difference in one of the properties of a dium speeds, high speeds, and low speeds. for the fuel/air mixture ratio at idle and liquid, such as the typical fuel for the Maybe if the users of the Veco 19 shout low speeds. engine, and a gas mixture such as enough, they can also get such good An idle mixture system is necessary atmospheric air. It happens that while things. How about a timed-luel-injection because of the small pressure drop across the density of air decreases as its rate system? %

The MODEL BUILDER 63 CLASSIFIED ADS Non commercial Rate is 25 cents per word with a minimum of $3 00 worth Commercial: Rate is 40 cents per word with a minimum of $5 00 worth No mail order discount house ads knowingly accepted. WW:L All ads are payable in advance and may be for any consecutive insertion period Fifth Annual specified. Name and address free Send ad and payment to. The MODEL BUILDER. Orange Coast R/C Club Classified Ads. 12552 Del Rey Dr,. Santa Ana. California 92705 WORLD WAR I CONTEST Specialists in R/C and headquarters for the Kirtland Hardware & Hobby Shop, 9138 Rt November 12, 1972 new QUARTER MIDGET PYLON LEAGUE. 306, Kirtland, Ohio 44094, (216) 951-2220 at MILE SQUARE FULL-SIZE PLANS No. 7724 TRAVELAIR '2000' Two inch full scale Classic R/C (with instructions) ONLY PLANES USED PRIOR TO biplane. Proven flier, 60 power November 11, 1918 SERVICE By Bill Northrop $4.00 WILL BE ELIGIBLE No. 6721 WAKEFIELD CALIFORNIA SCALE AND FUN FLY No. 10721 STEPHENS AKRO Highest placing U. S entry Contact Joe Tschirgi, CD, for information R/C Standoff scale of popular in 1971 World Championships. 1841 Whitestone, Santa Ana, Ca 92705 aerobatic ship, for .35 .40 eng. By Bob White $2.50 By Brad Shepherd S4.00 (714) 544 - 4735 No. 6722 MONGSTER No. 10722 MINI - FAI Two inch scale quarter midget No. 1722 PUSS MOTH High performing .010 powered EAA type biplane pylon racer. Chet Lanzo's famous rubber miniature F/F. Only 24" span. By Ed Nobora $3.50 F/F scale Puss M o th returns! By Loren Williams S2.00 No. 6723 CALIF. COASTER By Hal Cover $3.00 All sheet balsa R/C soarer feat­ uring a 9 foot Jedelsky wing. No. 1723 WHITE TRASH No. 9721 COLEEN-12 By Mat Tennison $3.50 A proven, trophy winning R/C Graceful 8 ft. V-tail soarer has sailplane w ith 7 and 10 ft. span slope or thermal wing plans. No. 5721 SEAHORSE II By Rick Walters $3.00 By Randy Warner $3.00 Excellent trainer, designed for land or sea, 19 to 35 power No. 12711 CURTISS-WRIGHT JR. No. 9722 BABY BOOMER By George Wilson $3.75 Two inch scale model of fam­ Twin-boom sport free flight ous pusher light plane. R/C pusher for .020 power. No. 5722 HUMMING BIRD By Ralph Fidance $3.50 By Art Reiners S1.50 Radio controlled F/F Scale early English lightplane, 049 No. 12712 TWIN TRAINER No. 9723 LITTLE TOOT By Walt Mooney $3.00 Sport R/C model for two .30 Semi-scale R/C bipe for .40 to .50 engines. engines. Great performer! No. 5723 WHETSTONE By Bill Northrop S3.00 By Denny Elder S3.50 Half A Combat ship to sharp­ en your reflexes for contests. By Steve Fauble $1.75 No. 11711 NANCY No. 8721 BONZO, R/C Scale-like, 96” span R/C ghder Semi-scale model of Whitman No. 3721 YANKEE GULL featuring easy construction. racer, for Form II, FAI, Open. Expandable R/C soaring glider By Jack Elam $2.75 By Fred Steffen S3.25 with 8’ 4" to 12'-0" wing span By Le Gray $3.75 No. 11712 Bl PRENTICE No. 8722 COUNTERFEIT. A/1 Training type R/C biplane for High performance competition fun flying. Uses .29 .50 engines. A/1 Nordic flying wing glider. No. 3722 MISS COSMIC WIND By Bill Northrop $2.76 By Bob Provart $3.00 Contest winning Quarter Mid get racer Fast, easy building. No. 9711 BEANPATCH No. 8723 TAYLORCRAFT, F/F By Fred Reese $2.75 An EAA scale-like model for Rubber powered, 24 inch scale No 3723 SIEBEL Si 201 sport R/C 45 power. seaplane. An excellent flyer. All sheet balsa profile free- By Bob Upton $3.60 By Walt Mooney S1.50 flight scale for 020 power By Jack Headley $1.50 No. 9712 FAIRCHILD 22 No. 8724 SHOESTRING. R/C Scale old-timer for single chan Easily built Quarter Midget No 2721 MINNOW nel radio or free-fiight. .020 racer, fits 10% thickness rule. Control-line Profile Goodyear power. By Brad Shepherd S3.00 racer, "Cosmic Wind." By Tom Laurie $2.25 By John Penhallow $2.50 No. 7721 FAIRCHILD 51 Price includes Third Class postage No. 2722 FOKKER E-Ill One inch scale Classic for R/C, and reprint of building instruc­ WWI R/C scale for .60 engines. also F /F gas or rubber. tions. Add 35 cents for Special Rudder, elevator, and throttle. By Hurst Bowers $3.00 Handling, for possible faster deliv­ By Berm Huber $3.75 ery. Add 50 cents for orders out­ No. 7722 SAM-5 No 2723 E Z BOY side of USA. California residents Top-notch competition Nordic Half-A competition tree-flight add 5% sales tax. A/2. Full wing plan. A winner. for '72 rules and all modelers. SEND TO: By Ron Evans $2.50 By Al Vela $2.75 THE MODEL BUILDER PLANS SERVICE No. 7723 COMANCHE "C" No 1721 SHOCER 12552 DEL REY DR. Quick and easy to build, 58” Hot Class A/B Free Flight cont­ SANTA ANA, CALIFORNIA span standoff scale, 40 power. ender for 1972 Rules. 92705 By Jim Sunday $3.25 By Mel Schmidt $3.50

64 The MODEL BUILDER KWIK-FLI III . . . World and twice Nats, winner. Designed by Phil Kraft. Span: 60" Eng.: 45 to 61 Kit RC-12 $ 4 5 .0 0 Includes T.A.C.— Ready made wing fixture REPEATED NATIONALS AND WOULD CHAMP. for those who insist on the NOBLER . . . Winningest plane of all time VERY BEST! Span-50" Eng.-.19-Κ3Γ 35 Kit...... N-l $ 1 5 .9 5 CONTROL LINE SCALE MODELS NATIONAL AYSC S U P E R F O R M PLACE WINNER S.E.S.a Never before has a R/C scale model been designed PREFORMED FUSELAGE SHELLS JUNIOR NOBLER ... For expert or novice Span-40" Eng.-.15-.25 Kit N-6 89.50 with such attention to the most insignificant detail. Wing FOR FAST STURDY Span: 52" Eng.: .45 to .60 Kit RC-13 S 4 7 .5 0

THE CONTENDER— The first all-balsa R/C model you can 40 WARHAWK . . build in just 8 hrs. Wing Span: 54" Eng.: .29 to .60. Kit Span-28" Eng.·. 15- 29 Kit S-l e - 1 1 O K RC-15 $ 3 4 .9 5 PEACEMAKER . . . Superform for fast construction, excep­ tionally durable. Span-46" Eng.-.15-.29 Kit N-7 g-|0.95 FAMOUS FLITE STREAK FAMILY

R/C NOBLER— Radio version of the winningest stunt model of all time. Wing Span: 51" Eng.: .35 to .45. Kit RC-14 $ 2 9 .9 5 P-510 MUSTANG . . . FLITE STREAK . . . Combat Soan 37" Eng.: .29 .35 Kit S-3 $ 1 7 .9 5 or stunt flying at terrific speeds. Span-42" Eng.-.15- .35 Kit N-2 $ 7 9 5 AYSC CHAMPION JR. FLITE STREAK... Span-31" Eng.·. 15- MUSTANG P-51 . . . A standoff scale model that only a ruler .25 Kit N-3 $ 5 .9 5 can tell from a true scale plane. Wing Span: 60" Eng.: .40 to .60. Kit RC-16 S 4 5 .0 0 BABY FLITE STREAK Span 24V7" Eng.-.049- HAWKER HURRICANE . . . 099 Kit N-4 $ 3 g o SINGLE CHANNEL R/C COMPACTS Span 42" Eng.: .19-.35 Kit S-51 $ 8 .9 5 COMBAT STREAK Span-42" Eng.-19-.35 $ 7 .9 5

CURTISS P-40 TIGER SHARK . . . · · · Span 42" Eng.: .19-.35 Kit S-50 5 8 .9 5 HEADMASTER . . . Galloping ghost and proportional gear. Includes T.A.C.— Ready made fuselage. Span: 48" Eng.: .09-.35 Kit RC-11 $ 1 7 .5 0 STREAK TRAINER . . . TOP DAWG . . . Galloping ghost and proportional gear. In­ Span 33" Eng.-. 15- 19 cludes T.A.C.— Ready made fuselage. Span: 39.5" Kit N-10 $8.95 Eng.: .049-.15 Kit RC-10 $14.95 CONTROL LINE COMBAT MODELS SCHOOLMASTER . . . Single or multi channel with rudder, COMBAT CATS . . elevator and engine control. Two complete mod­ Span-39" Eng - 049- 090 Kit RC-8 $ 9 .9 5 els in one box. Span-18" Kit S-21 Span-39Vfr" Eng.-. 19- THUNDERBOLT .35 Kit N-8 $ 8 .9 5 SCHOOLGIRL . . . $ 2 .9 5 Span 32" Eng.: .020-.049 Kit RC-9 $ 8 .9 5 Spad-18" Kit S-22 (2-models) If not available at your dealer. . . order COMBAT KITTENS direct. Add 10% postage and handling. Span-22Vii" Eng.- SCHOOLBOY . . . .049 Kit N-9 $ 5 .5 0 Span-29" Eng.-010-.020 Kit RC-3 $5.50 (35« minimum.) Outside U.S. 15% (60C minimum.) (2-models) TOP FLITE 1MODELS Inc. SLÍTZ E2 FORMULA I F.A.I. 1. Cliff Weirick 1. Garry Korpi 2. Larry Leonard 2. Terry Prather 3. Harold Coleson 3. Chuck Smith

High g loads, pounding vibration, buffeting, cramped installation, high speeds at low altitudes and super sensitive controls . . . no other part of the radio control sport demands so much from the radio control system as does racing. Perhaps that's why 70% of the entrants in the racing events of the 1972 Nationals used KRAFT equipment.

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K r a f t 450 WEST CALIFORNIA AVENUE, VISTA, CALIFORNIA 92083 SYSTEMS. INC. W orld’s Largest M anufacturer of Proportional R /C Equipm ent