THIS MONTH'S a sue plan Parlmu flyer GYM DANDY

FEBRUARY 1962 TWO SHILLINGS U.S.A. & CANADA 40 Cents

Boeing Stearman KAYDET' plans

contest designs } radio control ^ model news get set for a owing success !

get the Ν β /

With extra performance for the competition enthusiast and added refinements for the discriminating modeller, this new version of the Bantam will bring you countless hours of pleasurable flying. Just look at the extras it packs: • radial tank mount means you can fix the engine in any position • anodised cylinder head and tank for air appeal • complete with 6 in. by 4 in. propeller and multi-purpose spanner • fitted with the new Quickstart EG 98 glowplug The new radial tank of 4 c.c. capacity is precision turned in aluminium with a pressure diecast mounting that includes vents and attachment lugs. With all the other traditional Bantam features—superb performance, easy starting Cam Quickstart device, low-price— the BANTAM DE LUXE is made to make you thrillingly airborne.

Only 48/· in your local model shop now !

for all that’s best in power flying

DAVIES-CHARLTON LTD Hills Meadow Douglas Isle of Man Editorial Director D. J. Laidlaw-Dickson

Advertisement Director C. S. Rushbrooke

EDITOR R. G. Moulton

other modelling angles . . · February 1962 February edition of our companion magazine VOLUME XXVII No. 313 RADIO CONTROL MODELS & ELECTRONICS has dimensioned details of American Herb Clukey’s teeny little radio bipe for lightweight gear and .020 engine, contents appropriately named the “Radi-O-Too” as HEARD AT THE HANGAR DOORS 66 an immediate answer to those who query AEROMODELLING IN ADEN 68 its purpose. For multi-men there’s a feature GYM DANDY INDOOR FLYER PLAN 69 on channel allocation—which reed for which OVER THE WAVES 70 relay etc. For the home constructor, some really useful gen on do it yourself ARMCHAIR AERONAUTICS 73 transformers . . . plus lots of other R/C news. QUESTIONS & ANSWERS 73 In February MODEL MAKER & MODEL SCALE MODEL NEWS 74 CARS, the latest on lightweight car IS U N D E R C A M B E R NECESSARY? 75 construction and a report on the Aintree 200. “NUMBER 96a” 78 For Yachtsmen. John Lewis talks of twin fin FAMOUS BIPLANE No. 30—Stearman PT-13 80 experiments and Dick Priest on racing tactics. ENGINE ANALYSIS Veco 35C 84 For Power boaters, Vic Smeed’s 42 inch WORLD NEWS 86 version of the fast Fairey Huntsman, and for SQUADRON MARKINGS 88 scale car enthusiasts, a Prototype Parade CLUB NEWS 89 drawing of the Sunbeam Alpine. Both magazines are the same price . . . 2/- cover per copy. If your hobby shop cr newsagent Back again after a long breok is George Cox’s popular Famous Biplanes feature, and in this does not carry stock, send 2/4 for return issue he deals with the most heavily produced Biplane cf the secord World War. Front cover shows a beautifully restored Bocirg-Stcoiman PT-I3D which was presented to the LSAF post delivery from address below. Museum at Dayton, Ohio. I SA. Only the balloon tyres and wrong size wing markings distinguish it from an original. Incidentally, yet once more George Cox establishes a new stardatd in occuracy. Any resemblance to previously published Suoimon PT-13 drawings is purely coincidental. Copious manufacturing reference drawings have enabled George to produce reminder ·.. an indisputable addition to his series. Indices for all three Model Aeronautical Press magazines are now available for the next month... 1961 issues. Send I/- plus stamped and self Radio control is fast reaching the stage where we can use "fit and forget" equipment— addressed envelope (3d. stamp for United well, almost (!) Anyway, modellers are demanding better looking and “different" Kingdom readers) for copies of either MODEL subjects for single channel and intermediate control. In arswer, we have the rerowred P. E. Norman's latest near scale midget racer, based on the famous American "Goodyear” MAKER or AEROMODELLER indices, 6d in full-size racers. Who else but "P.E." could produce the most crash-proof toughic? the case of RADIO CONTROL MODELS. All Moreover, we know you’ll like the sleek lines of his 42$ in. span model for 2.5 c.c. that three for 2/6 plus envelope. Handsome performs like a scalded cat and is introduced into AEROMODELLER Plans Service next month. Those who seek unconvcntioral sport models vs ill like Vic Smccd’s Double “Easibinders”, specially made for our Delta for the little Cox engines or similar. FULL SIZE PLANS for this 24 inch easy to magazines are also available price 12/6 from build, easy to fly novelty will be included in next issue! For the scale men; Peter Gray the editorial offices. detailsthe famed Sopwith Dolphin. Forthc ingenious: aGadgct Review. For the practi -al; Jim Baguley on Glider Structures and for every modeller, loads of interest and news.

Editorial and Thi» periodical is sold subject to the following conditions: that it shall not. without the Advertisement offices written consent of the publishers, be lent, re-sold, hired-out or otherwise disposed of by way of Trade except at the full retail price of 2/· or 40 cents and that it shall not be lent, 38 Clarendon Road, re-sold, hired-out or otherwise disposed of in a mutilated condition, or ip any unauthorised cover by way of Trade; or affixed to or as part of any publication of advertising, literary or W atford, Herts pictorial matter whatsoever. Application to mail at second class postage rates pending at New York N.Y. Registered at Telephone: W a tfo rd 32351 (Mon.-Fri.) the G.P.O. for traismiision by Canadian Magazine Post. American enquiries regarding subscriotions. news stand sales and advertising should be sent to: AEROMODELLER. Eastern CORRESPONDENCE anticipating a reply to addresses News Distributors Inc., 255 Seventh Avenue. New York I, N.Y., U.S.A. within the United Kingdom must be accompanied by a stamped and self-addressed envelope. News Direct subscription rate (Inland) 28/6 (Overseas) 27/6 per annum including enlarged reports should be submitted to arrive not later than December edition and index. U.S.A. and Canada direct rate $4. AEROMODELLER incor­ the 15th each month for publication in the next porates the MODEL AEROPLANE CONSTRUCTOR and is published monthly on the third immediate issue. Photographs should be accompanied Friday of each month prior to date of publication by:— by negatives where possible and can only be accepted for use on an exclusive basis for British copyright. MODEL AERO NAUTICAL PRESS LTD

Kindly mention AEROMODELLER when replying to advertisers m m castDimBa 56 February, 1962

“MINNOW” I NEW COSMIC WIND TRUFUTES Ideal for Indoor Pylon Pacing.

WITTMAN “BUSTER” Brand new 16' span additions to a wonderful range of Flying Scale Models.

«iMtmutitnii | «in*»* PRICE

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THE R a n g e

$A C last Team Racer. KWIK-FIX For Motors up to 1.5 c.c. PINTO 20' SPAN REAL PREFABRICATION Fully machined Fuse­ lage Halves. Finished Aerofoil Section CESSNA SKYLANE Wing. Tail Surfaces cut to shape. Pre­ formed undercart & Designed Expressly for RADIO CONTROL Sponge Rubber Wheels. Fulcrum. Components, Cock­ For M otors 1.49 up to 3.5 c.c. for Single pit Cover etc. and Lightweight Multi-Channel Radio using Rudder, Elevator & Engine Speed PRICE Systems only.

MODELAIRCRAFT ( B ’M OUTH) LTD. Die-Cut and pre-cut balsa and ply parts. Pre-formed tricycle undercart. 2 in. NORWOOD PLACE Sponge Rubber Wheels. Spindled engine cowl, shaped leading and trailing edges, BOURNEMOUTH spinner, etc. P h o n e : B’MOUTH 43061

Kindly mention AEROMODELLER when replying to advertisers m M February, 1962 57 [Ki;d;d;el»l»er

«lust like the real thing ! Believe it or not, the nearer one That’s how wonderfully realistic Airfix models are! Close attention to is the Airfix model of the every detail gives them their faithful-to-the-original look—makes them Douglas C-47 Dakota, l/72nd true collector’s pieces. And every Airfix scries is to a constant scale. scale (Kit 6/-). Behind it is a This means Airfix models look proportionally right, one against another, picture of the real thing. because they are right! You can’t beat Airfix for realism—or value.

STOP PRESS! Latest Airt in vuuaion Constant Scale Construction Kits From Model &. Hobby Shops. Toy Shops and F. W. Woolworth

HALIFAX Mk III This magnificent 1/72 scale model of the Handley-Page "Halifax” has a 16$' wingspan, retractable undercarriage, rotating turrets, moveable control surfaces and . a complete set of tranfers. 110 part kit — 7/6 ALSO NEW: H.M.S. "NELSON” Another in the Airfix Warship Series. This famous ship is reproduced in magnificent detail, overall length 14'. 134 part kit 6 -

Kindly mention AERO MO D ELLER when replying to advertisers MSUJM) 58 February, 1962

TTOPvairon 61*0 r/Ml.os.w wmeSHAPC lccs WOO to

’^^'Z n ers carefully μ /ns t bonds to hold 8 Bend undercort to this sh

tutu To rn ^ ^ ) Cement on bottom plonking | \ Tope cowl to bend without 10 D rill nose block ond ' fitting between sides splitting. Trim to fit to front o f fuselage “ FOLLOW STEP II*’. . . A good pre-fabricated kit makes building so easy . . , follow the plan or instructions step by step, with all the Balsa sheet parts accurately die-cut to shape. So much better than having to cut each part out freehand. There were die-cut kits before the war but it is only within the last decade that really clean, accurate —and often intricate— die-cutting has become an established technique. VVe at Solarbo are justly proud of our production in this field, which manu­ facturers and aeromodellers tell us (we don’t have to tell them) is the best in the world. And, of course, we always select just the right quality Balsa for die-cutting. That makes a lot of difference, too. We have also developed plenty of original ideas in die-cutting. One of the features of the YEOMAN QUICKBUILD range of all-balsa kits, for example, is the “kerfed” or scored panels for bending to curved shape. We had to develop a method for producing just the right depth of cut so that, when hacked up with a strip of cellulose tape, an otherwise rigid panel bends easily and exactly to the required curve. The latest YEOMAN DORNIER Do 27 kit features this for the top cowling, supplying the perfect answer to an otherwise tricky building problem. The YEOMAN kit designer asked for this special type of scored cut; we worked out how to do it. The result, even better prefabricated kits in the all-Balsa YEOMAN QUICKBUILD range.

ALWAYS ASK FOR

/ y , ] IT BY NAME COMMERCE WAY, LANCING, SUSSEX. Sotui faisb

Kindly mention AERO MO DELLER when replying to avdertisers E.D. 1.49 c.c. SUPER-FURY’ A long-life, power packed engine especially designed for Contest Work and one that will surprise you by its magnificent performance. The ‘‘SUPER-FURY** is a first class engine ar.d is used and appreciated by modellers all over the world. Covered by the usual E.D. Guarantee of course!

ELECTRONIC DEVELOPMENTS (SURREY) LTD. ISLAND FARM ROAD · WEST MOLESEY · SURREY Telephone : MOLESEY 6037-8 m m Μ 3 0 Μ 2 60 February, 1962 ARE YOU LEAVING SCHOOL?

DO ELECTRONICS INTEREST YOU? If so, you’re the sort of person the Modem Army’s looking for. Between the ages of 15 and 17, you can start on a top-line career with an Army Apprentices School—and you’re paid as you learn. Board, lodging and uniforms are free, with two months’ paid holiday a year. After your training you can earn up to £20 a week. A variety of electronic trades are included in the forty trades you can learn as an Army Apprentice. Each one trains you for a first-class career in the Modern Army; that means plenty of adventure, sport, new friends, new countries, good pay. If you’re interested, you can find out more about it by posting this coupon today. Applications for the next entry, in May, must be sent in by March 12th, or earlier.

TO THE WAR OFETOE (MPfi), LONDON. S.W.l. Please send me full details of Army Apprentices without obligation

NAME______A O E_____

ADDRESS

AAll/AM EXCLUSIVE TO A J M DDITAIM’Q 1EAMMfi model MANIIFAPTIIDCDQ DmIAIN o LLAUmb engine IYIANUi Au IUK l Ko

THERE IS AN "AM” OR “ MERCO” AND WING SPAN (in s .) ^ The "quality plus" range of high- performance diesels, IMPROVED ENGINE TO SUIT EVERY SIZE & for 1962. MORE POWER . . . TYPE OF MODEL—AND OUTPER­ ec easier STARTING . . . better- 1- UI FORM ANY OTHER ENGINE IN M AM than-ever DEPENDABILITY. < H >■ ITS CLASS. Check the BEST engine —J ® -i oc sQ -i D Z for YOUR model from this chart. “ 3 ONTEST Z “ 2 E E FLIGHT * 0

SPORTS SPORTS r °S ui U u «/) υ Σ | cu./n. Price f oc CONTROL *< MERCO LINE STUNT m ENGINE c.c. B.H.P. FLIGHT FREE g oc Ik 1 36-44 40-50 24-30 20-26 24-36 36-42 _ The BRIIISH power-packed A.M. 10 Mark II 1.0 .061 .12 61/- j glow motor which sets 10 Mk II R C 1.0 .061 .12 7 4/- — — 36-42 — 4 new world standards 10 Mk II W/C 1.0 .061 .12 8 3 Ί0 For marine models 1 or lasting perfor­ 42-48 44-60 28-36 24-30 |74-42 I4 2 -4 8 1 mance and quality 15 Mk II 1.5 .09 . 15f 63/- A production. 15 Mk II R C .09 — 142-48| 1.5 . 15f 75/9 — — 4a-54 c*·> The AUTO­ 15 Mk II W/C 1.5 .09 -15 f 85 8 For marine models MATIC 48-54 48-66 30-40 30-36 ; 30-48: 4 5 -6 0 | CHOICE 25 Standard 2.4 .147 .20 7 0 Ί0 - 1 for 5-6 cc. 25 W/C 2.4 .147 .20 92/1 | For marine models '· 35 Standard 3.9 .21 .275 72Ί0 48-60 48-72 : 36-45 1 36 | 30-54 54-60 | — « 35 W C 3.4 .21 .275 93 10 For marine models c FOR TOP PERFORMANCE MERCO 29 Stunt 4.9 .29 .55 139.6 — — 50-60 36-48 50-60 -- |1 - ' WITH ALL GLO MOTORS — — — 60-72 54-60 i 29 R/C 4.9 .29 .55 152/6 _ - A m G L O W "P l u g s 35 Stunt 5.8 .35 over .6 139/6 — 54-72 36-48 60-72 — - ( 1.5 volt short reach ... 4/2 35 R/C 5.8 .35 over .6 152^6 _ 1l — — 1— — 72-96 60-72 2 volt short reach ... 4/2 2 volt long reach ...... 4/2 W/C =* watercooled marine version, t Not incl. Trade distributors E. KEIL & CO. LTD. 2 v o lt R /C p lu g ...... 5/4 complete with matching flywheel. P.T.surcharge A. A. HALES LTD. (with idle bar) 30 ANGEL FACTORY COLONY II. J. ALLEN ENGINEERING» ANGEL RD., EDMONTON, N.I8.

Other sections of this fine book present 1/72 scale tone drawings of 70 representative types (13 occupying double-pages an album of 44 selected photographs of famous and experimental types; a 12 page section illus­ Produced with the co­ trating 333 Fighter Unit operation and approval badges, and a 16-page o f the Department of the schedule listing 430 types Ait Force, Washington, and variants complete D.C. with many details of each. 256 pages on art paper; This book covers a period size 8j in. x II) in., of 45 years of American weight nearly 2| lbs. fighter development, and Full-colour jacket illus­ thus includes the two tration and insert: cloth World Wars the Korean bound on heavy millboard. War and brings the reader right up-to-date to the late summer o f 1961. The narrative dealing with the period is concise and accurate, and is illus­ trated by over 250 fine photographs.

\ I J N 5 LTD.. Dejt. AM/US. U rcH W Q RTH' Herts. Learn a skilled trade and earn good money as an apprentice in today’s R.A.F. Why an R.A.F. apprenticeship? These two apprentices are working on the radar equipment of a jet fighter. They do the same job, they have the same interests and they’re the best of pals. Just over two years ago they were both at school. Now they are earning nearly £ 6.10.0 a week all found. In less than a year they will be fully qualified and by the time they are 21 they could be Corporal Technicians earning £ 17.17.0 a week with full allowances. Just before they left school these two young men looked around at the apprenticeships offered by industry. Few of them covered their particular interests, and most of them took five years. An apprenticeship in the R.A.F. offered them a wide choice of trades including radio and radar—something they were both very keen on. It is also one of the best-paid apprenticeships in the country—and only takes three years because You are encouraged to get as much you get down to the job right from the word go. They had no trouble making their choice. air experience as you can.

THE FUTURE IS WITH THE R.A.F The R.A.F. can train you in any of these trades: Aircraft Engineering. Radio Engineering. Armament Engineering, Electrical & instrument Engineering, Gonoral Engineering. Ground Signalling, Mechanical Transport, Accounting and Secretarial. Supply, Dental. Nursing Attendant. Photography. Catering. Please said mc> without obligation, illustrated booklets The giving details of training. Enquiries from U.K. only. NAME Royal ADDRESS- DATE OF HIRTH Send the completed R.A.F. Careors Inform ation Centre (AM142), Air Force coupon to :— Victory House, Kingsway, London, W.C.2 5 times a winner, this fabulous Go" span R/C model is suitable for single control with 2.5-3.5 c.c. diesels or multi-control with 19^-3 5" glow motors. . . . Combine with the Frog 349 R/C engine for a sure winner 1 The JACKD AW is the most fully prefabricated model yet offered by a British manufacturer and includes such extras a s: pre-formed dural, under-carriage, airwheels and all materials for “ full-house” multi-control. £5.19.9. Let the famous JACKDAW steal the show for you this Season!

349 R/C Fitted with multi-speed throttle and exhaust manifold. Specially developed for the “ Jackdaw” and similar Radio Control models. / £4.16.6. A lw a y s a LEAP ahead,

MADE IN ENGLAND BY INTERNATIONAL MODEL AIRCRAFT LTD., MERTON m m m 64 February, 1962

One of the best jobs in the world Fleet Air Arm Buccaneers moving at ten miles per You must have passed G.C.E. Ό ’ Level (or equiva­ minute above H.M.S. Ark Royal. Two squadrons of these lent) in English Language, Mathematics and three other magnificent aircraft are scheduled to come into service approved subjects. in 1962 giving still greater speed and power to Britain's There are basically two engagements, pensionable nuclear age Royal Navy. service to age 38 for those between 17 and 22, or 12 The men who fly these machines have a training years service for men between 22 and 26. Officers may second to none in the world, starting with a six months' terminate their engagements at 5 (Helicopter Pilots course at Britannia Royal Naval College, Dartmouth. only), 8 or 12 years with gratuities of £775, £1,500 and The basic qualities required of today’s officers are £4,000 respectively. the same as in Nelson's day — initiative, intelligence, resourcefulness and determination. Send for the new illustrated booklet ‘Fly in the You could be among those selected for training as a Royal Navy' which will give you full details. pilot, observer, or helicopter pilot. Among your qualifi­ cations there must be a zest for flying, an attraction for Captain G. C. Mitchell, Royal Navy, the Naval way of life and the ability to pass the Interview Officer Entry Section AM/24, Board which is designed to test your fitness, intelligence Admiralty, Queen Anne's Mansions, and character. London SW1. Fly as an officer in the ROYAL NAVY

VAA.20 February, 1962 65 3B 3MLS3

M A KE TH E If you really want to get the most from your Modelling, you can’t do better than buy and build a Mercury kit. Every Mercury kit offers good MOST design allied to first class materials, and hence real value for money. Ask to see a Mercury O F Y O U R kit in YOUR local MODELLING Model Shop.

F.A.I. Team Racer. A new design by Sid. WITH McGoun to the latest international Team Rac­ ing formula. All balsa kit for simplicity of building and ruggedness of construction. For 2.5 c.c. racing diesels. All the models below are C/L designs for I —I.S c.c. diesels.

M e. 109 flying scale m odel. Fully prefabricated kit. Bent wire parts. / good flier.

MARVIN Semi P IC A D O R flying wing scale cabin stunt model with cabin type fuselage. fo r I— 1.5 c.c. m otors For stunt and combat with a fine performance. training. Span 24“. Area Wing area 175 sq. ins. 154 sq. in. 19/3

Viper. Profile fuselage and built up wing make this an economical stunt model with The famous AJUSTA- a fine performance powered LYNE Handle, with the jA Team Racer. A sturdy little by a I— 1.5 c.c. m otor. non-slip (rip. Die-cast model which can be recommended body stove enamelled to beginners. All balsa-construction. red. Line length adjust­ m ent.

Mercury Metal spinners. Alu­ minium body with steel fixing MIDGE. Speed LIGHTNING. A beautiful plate. Very m odel for I— 1.5 c.c. scale m odel for tw o I o r 1.5 c.c. simple to fit. engines. One-time engines. Fully pre-fabbed kit. British record *T / H” diam 2 /1 I Now wonderful value at the holder. · \ m decreased price of 45/-. ■ 3/3 Ask your local stockist for a copy of the latest Mercury illustrated leaflet, with full details cf all Mercury kits, fuels and accessories as well as F.R. Radio-control Components.

M e r c u r y s t a n d a r d DISTRIBUTED EXCLUSIVELY BY wcd(e tanks * MERCURY Kits with lapped end joints and accessories are E. KEIL & CO. LTD for that the products of extra WICKFORD · ESSEX strength. MERCURY small 4/4 medium 5/3 MODELS LTD Export Enquiries to MODEL EXPORTS large 6/3 London, England 4 DRAPERS GDNS. LONDON E.C.4 February, 1962

Heard at the Hangar Doors

Entente t'orcliale In order to clarify eligibility of a flight within a set round, the following is to be added to the Code Sportif\ W e h a d λ f e e l i n g that our choice of a rubber model Article 3.7.1. “When the contest is run in rounds, the to the Coupe d'Hiver spec: as a give-away plan in timing of the model must be commenced before the end December issue was to be a happy one. It seems to have of that round for that flight to be included in that round” met with the most encouraging response and one club . . . in other words, let it go before the red flare goes off (Woking and D.M.A.C.) have already announced that to signal the end of the round. they will be including the class in a 1962 Open Rally. The Flying Scale rules committee is formed by: C. Specially pleasing is our ability to announce an Anglo- Mflani (G. Britain), R. Cizek (Czech.), A. Trzcinski French Challenge which will take place this spring, with (Poland), a nominee from the U.S.S.R. and Leroy Weber the sponsorship of A fromodfller and our friends Jr. (U.S.A.), who is secretary. They are to formulate rules across the channel, Le Modele Rain it d'Avion. This too, for universal use and application to free flight, radio is anticipated as the first of many such happy events and control and control line classes, but the contests are not to start the ball rolling early, the first Coupe d'Hiver to be considered as yet for World Championships. International will be a postal contest. By agreement with Maurice Bayet, who was founder Other sub-committees elected for service in 1962 arc:— of the class 21 years back and who is Editor of M.R.A., Free Flight Control line Radio Control the first 1962 event will be based upon the best individual R. Nyvarinen D. J. Arraiza Goni C . S. Rushbrooke score and best team score in three flights of two minute (Finland) (Spain) (,\.Z.) R . C crny (C zech.) G. Barthcl (Italy) H. Trumphcllcr maximum. French entries will be automatically taken (Germany) from the many decentralised Coupe d'Hiver contests J. Sokolov M. Bicnvcnu A . Dcgcn which take place in the winter period from December (U.S.S.R.) ( Belgium) (Switzerland) F. Lhling (U.S.A.) A. L. Aarts A. Roussel to March, as organised by the F.N.A. Only the first (H olland) (Belgium) contest entered will count. H. J. Nicholls (G.D.) R. G. Moulton (G.B.) Dr. W. Good (U.S.A.) For British entries, the three flights can be made on Secy. Secy. Secy. any one day in the month of March. The day will have Considerations of the F/F Committee are the question to be nominated to a club official, who will certify the of standard fuel for free flight as proposed by Finland. performance. Full details will be avai'able on application The C/L committee is to consider the British proposal to the Editorial Offices, and Official entry forms sent, for a new team race circle layout offering a double outer together with local club addresses for the unattached ring, one for landing and the other for take-off; the modeller. There will be no entry fee; but a stamped, question of the diesel as far as standard fuel speed events addressed envelope should be sent for the information. are concerned; the illustration of existing aerobatic Two fine trophies, the “A/M-M.R.A.” for leading manoeuvres and of the free choice manoeuvres for 1964. individuals and the “Coupe de la Manche” for the The R/C committee is to provide illustration of the Nation producing best three scores will be awarded for existing manoeuvres. regular annual compeittion. In this way, we hope we shall Interesting points raised during the meeting were: be providing some encouragement for the small field Flaps can be used as a measure of speed control on a flyer, who docs not enter other than club contests. glider (as the equivalent of engine control in a power The Coupe d'Hiver class was described in our Decem­ model) for mono control in contests other than World ber, 1961, issue, and a very successful Czech design is Championships. National Aero Clubs are responsible for seen above. the condition of Trophies in their temporary keeping and must have engraving done. The proposed reduction F.A.I. New* of team race tanks to 5 c.c. (by Czech.) is referred back Official minutes of the November C.i.A.M. meeting to all National Aero Clubs for opinion. Indoor contests have now been distributed to National Aero Clubs and will be on a basis of six flights with no attempts, the best enable us to enlarge upon the advance news. two flights to count, and a deflecting line allowed to February, 1962 67

Near tcalc Chancc-Vought Crusader by G. Franklin of Leicester is a sign of scale r/c interest. Weighs 65 lbs. w.th Orbit 10-channcl rclaylcss gear. Transmits, steerable nosewheel and brakes as well as normal control. Span is only 52ins. and root chord 20ins. prevent collisions though contact should not exceed 5 secs. In R/C, the best two out of three flights will be allowed for the 1962 event as a trial. K-Factors for the Α.Μ.Λ. C/L Aerobatic schedule were finalised and approved as follows:— F.A.I. SCORING F OR THE Λ.Μ.Λ. SCHEDULE (Third flight, for (hose with over 1,600 points in F.A.I.) Starting in 1 min. Inside Square loop ' Horizontal Square K =*l (1) K — 5 loop (1) K 8 Free plan oiler Take off K 2 (2) K - 7 (2) K = 10 Reverse wingovers Outside Square loop Vertical eight Certain readers are possibly suffering under a doubt K ^ 8 (1) K — 5 (1) K 4 at the moment, for they have not received the free plan (2) K — 7 (2) K = 6 Inside loop (1) K — I Triangular loop they sent for following the announcements in our (2) K —2 (1) K « 6 Hourglass K=10 September, October and November issues. (3) K — 3 (2) K 8 Overhead eight The reason is simple! No less than 20 sent us the Inverted flight Horizontal eight (!) K 4 K = 2 (1) K -*= 3 (2) K - 6 required coupon and stamps . . . but failed to place Outside loop (2) K 4 Four-leaf Clover their name and address on the coupon. Need we say 0 ) K = l K = 8 that under such circumstances it is impossible for us to (2) K — 2 Landing K = 5 (3) K 3 effect delivery? In order to fulfil our obligations to these GRAND TOTAL OF TOTAL POSSIBLE POINTS (Equal to readers, we give herewith the postmarks on envelopes F.A.I. score) 1,310. (the only clue we have to their location), and any disappointed reader from these districts should write to Seale llatlio Control at the Ants us immediately. We shall then check handwriting on Issue of the 1962 S.M.A.E. contest programme (see both envelopes and clear our files. page 89) brings a number of changes which require Ashford, Kent D erby further explanation. Last year, Single control R/C was Barnet Indecipherable—Dorset moved from the Nats to the Northern Gala, and for Birmingham. A. El land Birmingham, C.H. Haugcsund, Norway 1962 it is the turn of Multi to move. There are Multi Birmingham, F. Kings. Norton. Birmingham Channel contests in April and May for team selection, Broadstairs O ssctt which make up for the change, and in the place of Multi Burt on-on-Trent O akham C ardiff, A Pinner we have the newly introduced scale R/C event which is Cardiff. B. Ryde, Isle of Wight open to all forms of control. C roydon Wolverhampton As the F.A.I. International programme is finalised No less than 99 readers apparently could not read until 1966, the S.M.A.E. is now in a position to gear its the simple requirements, and although their coupons own contest programme according to the principal gave their name and address, they failed to enclose the events of the year. Thus in 1962, the first part of the requisite stamps. We regret that we had no recourse but season carries a concentration of R/C and C/L trials to ignore these coupons. (Imagine our feelings when we plus open events for free flight duration and at the end had to pay excess postage on two of these invalidated of the season, F.A.I. specification contests arc intro­ coupons... they had failed to even stamp their envelopes!) duced in preparation for further selection trials for free flight in the 1963 season. Other events which have moved in the calendar are the traditional “Openers’*, the Gamage and Pilcher Cups, and the Womens Cup is now incorporated in the Nats. N.JI.A.F. Dinner A A.G.III. Best attended of all the Society social functions, the 1962 Dinner, Dance and Prizegiving held at the members restaurant of the London Zoological Society was a great success. Chief guest Air Vice-Marshal B. A. Chacksficld, O.B.E. who is Air Officer Commanding 22 Group, Technical Training Command spoke of the 10,000 young men he had under his command and the capability of modern youth. Acromodclling is by no means a strange subject to the AVM and he is a keen protagonist for the hobby. Trophies were presented by Mrs. Chacksficld and included a special award to the Spring Park Club, accepted by D. Williamson for their effort in organising the camping site at the Nationals. Next day was the A.G.M., or should we say, the N. Western Area delegation’s inquisition of the Society? Out of this will come a long awaited explanation of many things, not the least being a statement on the Insurance protection offered to members.

Mr*. Chacksfield presents the Arthur Mullett Memorial Trophy for Sportsmanship to Sgt. R. Bott of the All-Art Jr. Leaders Regt.. who played a great part in crowd control at the 1961 Nationals, though they actually cam e to w atch and fly. A.V.M. Chacksficld looks on a t left. February, 1962 AEROMODELLING IN OTHER COUNTRIES i

Royal A ir Force in ADEN Protectorate described by Cpl/Tech. T. Hill

Author with modified APS Calamity Jane in Service colours, outside clubhouse at ri^ht. Deserted Control Tower a t flying Held (left) Below, top to bottom are Sgt. Whitby's neat Brooks' Biplane from A.P.S. plans with a Taplin Twin for multi radio control. Pink and grey colour scheme. Next, stripped for action over the sand, SAC BiJdick winds his rubber job, outside clubhouse. Bottom: A.P.S. Delta I with SAC Reid and LAC Hubbard holding while Mills .75 is started .

W o r k s t a r t e d o n the Khormaksar Clubroom during the early summer of 1959 (see picture in September 1959 issue). Built and designed by club members from two Dc Havilland Venom packing cases, it was completed in November 1959 and it is now equipped with three roof fans for cooling and ample electrical points. Latest acquisition is a large refrigerator for cold drink store! We have an excellent flying circle right outside the club door for control line; but big stunt jobs and free flight are taken to Sheik Othman. This is a wartime airfield and has also been civilian airport, about 10 miles in a straight line from Khormaksar but about 20 by road. In the direction of the prevailing wind, we have no distance limits. In other directions it is clear for several miles. The only time the weather can be guaranteed to be calm is in the early morning. On alternate Sundays, transport leaves the clubroom at 5 a.m. arriving at Sheik Othman at First light and flying continues until about 11 a.m. By this time the heat is so intense that no one would risk having to walk 5 miles or so to recover a model. The sand is too soft for mechanical transport so all recovery is by foot. We have often acquired the help of the helicopter flight in searching for lost models. They seem to enjoy doing it and look upon it as a good exercise. Daily patrols are routine helicopter duty. With the heat and winds we also get the thermals. It is not an uncommon sight to see huge columns of sand going upwards in really big thermals. Local birds (Kitehawks) are used to our flights, we have had several models attacked. A Keilkraft Caprice was well up in a thermal, (no d / t ) and as good as lost. Suddenly a kite- hawk swooped on it, caught it by the tailplane in its claws and tried to take it away. When it let go the model stalled out of the thermal and was recovered, with damaged tissue, after a timed flight of 12 minutes. On another occasion we had a small power job taken up an extra 50 feet or so by a kitehawk. We were going to ask for a ruling on this as it was in a contest, but decided on a re-fly. These kitehawks have a span of up to 6 ft. Competitions we held during holiday periods to avoid clashing with work. There are two excellent local model shops who often donate two prizes each for club comps. These arc usually an engine and kit. Not many clubs can boast of having an O.S. Max 35 and 2£ c.c. stunt kit as first and second prize for combat and O.S. 15 and engine timer as 1st and 2nd for free flight in a club comp, but it is a regular thing here. The shops will get anything we ask them to order so you can see we are well catered for—and cheaply too—with no purchase tax worries! Thinking o f joining the R.A.F? Offset rudder 3/θ " to port

Measure 5 A to ^ tip radius centre from root along this line. See other tip.

Dandy Pirelli !by Bill Robinson v\ (Cessna model club) ^ WICHITA. U.S.A Full-size pi for tissue c^rered 2 minutes 59 seconds

^32 sq ribs I «I \ Rear boom /8 dia A Taper to */32 dia / / \ 1/ ·· 3/ " Wosher \ '32 x '64 outline

28 sw.g / v / 28swghook / 1 6 dia p'op iSv hub f t I " I'i V For alternative 716 sq construction for wing, j|i tailplane and fin see dotted lines

\ \ '32sq outline h \\a n d ribs / Front view of U/C Not to scale 1/ ” '16 dia Note.· ,Port wing panel \\ ______y il Tissue tube is (/^'longer than st'bd ‘ -W=-—-—if socket

Forward boom 5/32dia Oural clip λ Position of Strip down your 1/32 sq. bal,.» and “ — prop hub rubber strip for a super little indoor- , flyer to perform in parlour or club 4 3/,'6 /Y / room. Alternative 1/16 sq. structure ' ' is for novice modellers (shown in Radius same dotted line). Ideal for winter activity, |. ·· ^ for both tips this American design offers an oxer- /3 2 S heet cisc in making simple, light models . , ι,.ιι .. wheel.y2 dia

1^2 win< Wing rib at Wing centre Dihedral w m m 70 February, 1962 OVER THE WAVES KIT & EQUIPMENT REVIEW FOR R/C ENTHUSIASTS

G o o d r a d i o m o d e l s arc specialist designs. It is not the right approach to take a simple free flight model, and equip it with radio, expecting success, for in most cases disappointment will result. A successful design is the Frog Jackdaw, which, in the hands of Stewart Uwins won several competitions in the rudder only class during 1961. Mr. Uwins is a well known and accomplished R/C flier, but even the best pilot cannot do well if the model he flies does not match his skill. International Model Aircraft took quite a risk, since the Jackdaw was entered in competition during its development stage, thus tested in the full glare of the public eye. Had the Jackdaw not been a success, it would have been quite a blot on I.M.A.'s reputation. Aesthetically, the Jackdaw has a superficial resemblance to the Uproar, not surprising perhaps in view of Stewart Uwins* association with the latter. Admittedly the Jackdaw has a cabin, but by drawing a line from the top of the engine bay to the front of the wing seat, the nose section takes on the resemblance of that of the larger design. Similarly the fin is a cleaned up, more rounded arrangement. The structure also follows the general layout of Uproar. Fuselage sides are filled in of the completed model. This is the whole point at issue, with balsa as far back as the wing trailing edge position, for naturally an incorrectly balanced model will not with open, diagonally braced sides aft. All this serves to perform as desired. If anything aim for slight noschcavi- illustrate the background of experience that has gone ness, which is permissible, whereas tailheaviness spells into its design. The kit has many die-cut components in disaster, and should be avoided like the plague. Remember both balsa and ply. All the ribs are thus prepared, too that the C.G. can move rearwards as much as 1 in. likewise the balsa and ply fuselage formers. In fact, during the covering and doping stage and some allowance other than longerons, spacers, spars and dowels which will have to be made. AH this appraisal of layout is most arc accepted to be hand cut by the builder plus those important before beginning construction, since it may little oddments, everything is die-cut or pre-shaped. A necessitate repositioning auxiliary bulkheads. good supply of hardware, nuts, bolts etc. is provided in a All radio models arc tailored to equipment since sealed polythene bag together with all parts, including one cannot modify the shape of radio components, so polythene bottle for the 2 oz. fuel tank. The pre-formed slight deviations may have to be made in the construc­ dural u/c and a pair of 2$in. Veco wheels arc included. tion of your Jackdaw, but in doing so, be careful to If you arc using the exact gear shown on the plan you avoid any weakening of the structure as a result. Con­ can expect little trouble, all the thinking is done, but struction is described admirably in the printed instructions this will not always be the case and the builder will provided with the kit and on the plan. Our model, have to formulate his own distribution of equipment in equipped with ailerons, was strengthened around the the fuselage with regard to the designed balance point inboard of the aileron positions top and bottom with 1/16 in. sheet which can be seen in the picture. Covering At heading are two views of our completed test "Jackdaw" resplendent in Black, White and Orange with Black and White chequered silk control is best in silk or nylon, either of which has very good surfaces. Below is our strengthened aileron construction mentioned in strength to weight ratio. Though it takes longer to cover, text. than with tissue, the effort is well worthwhile. Nix Channel Radio The Min-X 6 channel is the radio set we arc using in the Jackdaw, and the wiring harness was described last month. Transmitter, receiver and separate relay pack all have attractive gold anodised metal cases. The Trans­ mitter case is 16 s.w.g. metal housing two B101 67$ v. (135v.) H.T., an AD4 L.T. and auxiliary U ll type- batteries. Radio components arc layed out on a horizont­ ally mounted printed circuit baseboard. On it arc three valves, a 1U4, a 3A5 and a huge (comparatively) 3D4, a 26.995 crystal being incorporated in our example. There arc three double throw spring biased centre off switches to key the six signals and these arc of the finest quality, smooth in operation, requiring only light thumb pressure to move the toggles. The six pots for adjusting the six tones are mounted in the top of the case, the adjustment heads protruding through to the outside, each sporting a screw-on dome shaped metal cover to prevent any February, 1962 71

disturbance of the pot once set correctly. One does not therefore have to remove the back of the transmitter to tune in the tones to the reed unit. Interesting feature is the aerial coil, a square coil in etched circuit form. One thing that must be criticised however is the accom­ panying instruction sheet which really presumes previous experience. Not that the Min-X set is alone in this respect. Manufacturer’s instructions in the majority of cases tend to be delightfully vague and frankly it is just not good enough for the novice. If a fellow spends so much money on a set he expects to be told just exactly how it works and how to use it. If you tell a chap what makes a thing tick, he is much less likely to pull it apart to find out for himself, causing damage in the process. Actually the instructions are intended for all Min-X multi channel transmitters but the layout of the non- simultancous six channel set is quite different to the 8, 10, and 12 channel simultaneous units to which, practically all references are made. In fact at one point the directions arc quite inaccurate for in the section on tuning, the oscillator adjusting slug is identified as being mounted horizontally and having a red dot for identifica­ tion, whereas it is in fact in a vertical attitude with a yellow dot. Correspondingly, the ceramic trimmer capacitor should in fact have a yellow dot, but has none, and although referred to :n the instructions as being adjustable, it is locked with solder. We sincerely feel it a great pity that so fine an example of workmanship should be let down by a set of duplicated instructions. Presentation of the simplified harness last month was the result of deciphering tw'o different circuits and should do much to clear the air. The receive·- is in two parts, the receiver proper and reed unit, with the relays in a separate box. Reason for this is that one thus possesses a flexible unit which can Abuve arc the three new Dc Bole models, from top to bottom: C obra, be used with different relay packs for varying control Yankee and Viscount. Space Control proportional transmitter can be seen in the foreground of the bottom picture. Below is a view from the combinations, or with relayless power amplified servos. back. of the Min-X 6 channel transmitter with the back removed. It also has the very real asset of less weight concentrated Auxiliary U 11 battery can be seen behind the valve on the far left hand in one unit. The receiver weighs 3.3 ozs. and measures side and Xtal in front of same. Note the large 3D4 valve, to the right of which is the vertically mounted etched aerial coil and at extreme right, 2± in. x 1 1/16 in. x 2/ 9/16 in. It is all transistorised, two of the key switches. The domed pots can be seen in the top of the case. working off a 6.25 volts pack of 500 DKZ DEAC nickel cadmium accumulators which also supply the power for the servos. A picture of the Rx appeared in our December 1961 feature. The separate relay pack contains six Deans Relays of low resistance and smoothing capacitors on etched circuit board. The relay switching contacts arc not wired up, this being left of the operator. The case measures 3 in. by ljj in. x 1/16 in. and weighs 4 ozs. New itoiiis Of interest to the experimenter is a new handbook by Bernards Publishers Ltd., “Transistor Circuits for Radio Controlled Models" by Howard Boys, well known radio modeller. This 64 page book size 93 in. by 1\ in. contains circuits, descriptions and diagrams for 32 different items. The contents open with simple subjects like the discourse of the exact function of the transistor, the transistor tester and field strength meters, to interesting subjects such as tuning fork stabilised tone generators and triple simultaneous proportional equipment. The book costs 7s. 6d. and is worthwhile for home constructors. Harold deBolt provides some news from U.S.A. with pictures of his latest creations and productions. Just coming onto the market in his new 42 in. span single channel trainer the Liver Wire Yankee, sporty high winger of 336 sq. ins. area. Weight is 24-30 ozs., and the Yankee is designed for 1 c.c. to 1.5 c.c. engines. Intended as an easily assembled trainer this model will doubtless be as popular as all the previous Livewirc series. Live Wire Viscount is a low wing multi channel continued overleaf 72 february, 1962

Over the waves (Continued) machine of 60 ins. span, smaller than the average model of its type. The object is to cut building time, which llal claims to have done (by 50 per cent.). One interesting method used to achieve this is to employ full span aileron» made simply from a standard moulded wing trailing edge strip. Naturally the Space Control, quadruple simultaneous proportional R/C set Hal installed saves time since the receiver and servos arc all in one box (except aileron servo). The model flics equally well with reed equipment having been tested with such by Ron Chapman from Canada so when it appears after kitting this winter i( should be popular. Power of Hal's original was a Super Tigre 35 and it weighed 54 lbs. for its 720 sq. ins. area wing. Under development is the Live Wire Cobra, semi-scale Bell Airacobra again of 60ins. span and S.T. 35 powered. Prototype used controlaire relayless 10 Superhet radio, but a Space Control equipped example took second place in R/C scale at the 1961 U.S. Nationals for Dick Allen. Wing Area is 660 sq. ins. for a weight of 5i lbs. The first of the ultra lightweight all transistorised, relayless receivers working off two pcncclls (3 volts) we have had the pleasure to handle is the CS 501, sent Franklin Bros, expanding hub wheelbrake with hub dismantled, reveals in by Roland Scott. It weighs just f oz., having no case, mechanism. Two shoes are seen prised open by cam. This is the best brake of its kind we have yet seen and will take some beating for price and but components are mounted on a printed circuit quality. board measuring only 2 in. by If in. The circuit incorpor­ ates four transistors. One Philco TI324, two Philco trolled, (ours at 26,995 m/cs.). A single 2N371 transistor 2N224 and a 2N213. The receiver will operate with a is used to supply the sine wave audio tone (700 c.p.s.) tone transmitter of modulation frequency of 400— modulating the carrier 90—95 per cent. Battery power is 1000 c.p.s., though 700 c.p.s. is optimum. Modulation 14 volts L.T. and two 67| v. (135 v.) The transmitter percentage required is 80—100 per cent. Idle current costs £13 18s. 6d. Pictures of these in January R.C.M. & E. (carrier oflf) is 6 m.a., dropping to 4 m.a. (Carrier on), A new Mini Servo announced by the O.B.M. company, escapement current being 325 m.a. at 3 volts with 8 ohm is for single channel, built round the popular Mighty escapement. Maximum and minimum operating voltages Midget motor. Four pcncclls provide the power with are 3.2 v. and 2.4 v. respectively. An operating tempera­ 3 v. drive, 1.5 v. for “Sniff [Back'* braking and power ture range of +20 degrees to 120 degrees F. makes this for extra escapement to engine control. There is no unit entirely satisfactory for our climate. Price £10 13s. 6d. fear of the servo overrunning a position for its system Matching Transmitter is the extremely small CS-502 of reverse polarity switching in that event, causes the measuring only 74 in. by 48 in. by 2\ in. The circuit motor to “Snilf Back”. Current drain when moving to employs a 3A5 valve, the frequency being crystal con- position is 250 m.a., the servo weighing only 2\ ozs. Layout of O.B.M. servo can be seen below in mounting position. Manu· Physical dimensions arc 2jf in. by 2 in. by If in. Five facturers emphasise that every effort should be made to ensure a wipers make contact with the switching drum to give the perfectly flat mounting against a bulkhead. Provides selective compound control movement desired, the worm gear reduction to action, with “quick blip” contacts for second actuator. which is 50:1. Those interested who require a more 5 wiper orms detailed report should refer to the November 1961 contoct drum edition of Radio Control Models. Price is 59s. 6d. switch on rear with "sniff-bock” GeofT Franklin of Leicester, well known as a multi electronic, braking flyer, announces availability of a very neat and beauti­ fully machined Hub Brake, with sponge rubber wheels. The brake assembly plate is Allen Screwed to the u/c axle, and on it arc two rubber lined brake shoes. The internal expanding brake is actuated by a lever on the outside of the plate which prises the crescent shaped Rotory^s^ brake shoes apart to make contact with the side of the 'contact drui hollow hub just as on any motor-cycle. The brake shoes are spring centred. Wheels are available in 24 in. and 50:lWorm 3A in. diameter sizes and cost 70s. per pair, though drive singles can be obtained price 37s. 6d. The effectiveness of this unit can be gauged by the claim from the manu­ facturer that it is possible to run an engine in a model Mighty at full revs without the braked model moving. Actuation 7 wires Midget of the brake should be by either down elevator trim or to relay Motor by full down elevator and it should be a great asset to batteries those lucky enough to operate from runways. and FUSELAGE Also offered is a Steerable Nosewneel Unit with twin secondary BULKHEAD 10 s.w.g. wire coiled spring legs. Again it is a ve:*y neatly escopement manufactured item being simple to apply to an airframe, having great durability and is quite light. Price is 37s. 6d. #OBM s e r v o and spare legs can be obtained at 3s. per pair. 1 -·. \t\H ery of

Armchair Aeronautics . . . at the he^iim in^ almost every aspect of our hobby, then this would be the choice. The author’s many years of standing in front of the class and educating LES PETITS AEROPLANES by G. Houard. Ubrairic Aeronautique, Britain’s rising generations stands him in very good stead when it Paris. 48 pages illustrated. 5 x 8J Centim es— in 1909. comes to putting over a technical story in simple language. We make a strict exception to our policy of only reviewing latest publications when we bring to light this 52 year old manual on Kites S e t r o m p l r t e d and experimental models. It is a gem, found for us by C.I.A.M. WARPLANES OF THE SECOND WORLD WAR, FIGHTERS President Hans Justus Meier whilst in Paris for the last F.A.I. meeting. Vol. Four by William Green, MacDonald, 16 Maddox St., London, Models were based upon the Wright Biplane, the Antoinette and W. 1. 208 pages Illustrated. 4 J x 5 1 ins. 9s. f'd. Bleriot, but indicated a remarkable degree of forethought. Helicopters Covering aircraft produced in the U.S.A.. and Yugoslavia (on were not neglected und the method of launching a model Diaholo only five of the many pages), this completes the set of pocket size style to give an extra twist to the airscrew, might yet have a modern reference volumes that are invaluable to modellers and aviation application. This is a treasure for anyone keen on the history of enthusiasts alike. Drawings and excellent selection of photographs aeromodelling, and a revelation to those to think it all happened in have made each of the four books a "rare-bird” seekers paradise the last 20 years. and this last, bright blue jacketed one is no exception in quantity or quality. How about the gull winged, twin boom pusher Vultcc U gjiter Ilian air XP-54 for flying scale? Or a racer based on the Bell XP-77? These THE HISTORY OF AIRSHIPS by Basil Clarke, Herbert Jenkins, arc but two of many inspiring references which are amply described 3 Duke of York St., London. 194 pages, illustrated, 5J x 8} ins. 2 li. in detail. Type histories are always fascinating, and of the many in Dogged ny tragedy, the story of the gas filled airship has not been this book, we find that of the Mustang origin, one of special interest. blessed with commercial! success. In this history, the author reveals a happier side, and one which will be new to many students of aviation A i r b o r n e history. Well written, and concluding with an excellent bibliography WHERE NO BIRDS FLY by Philip Wills, G. Newnes, London. of other references which inspire one to find out even more about 142 pages, illustrated, 5) x 8) ins. i l s . lighter-than-air craft, tlic book opens with descriptions of the earliest It is not easy to convey the spirit of flight into words, nor the balloons and takes one through to an eye witness account of under­ excitements and frustrations of competition, but Philip Wills carries w ater Polaris firings, observed from a U.S. Navy ZPG.2. "Blimp”. the reader right into his sailplane cockpit in this book and leaves It makes fascinating reading. one sparked with an enthusiasm for full size gliding. It also detours into a little story behind the management of Slingsby Sailplanes and lianillxiok ils future. If you are considering one of the many excellent gliding holidays this year, this book will provide a guide, from first flights AEROMODELLING by Ray Malmstrom. Arco Publications, London, 168 pages illustrated. 41 x 7 | Ins. 12v. 6

competition flying and as I have also stated, is a waste of money, materials and time. Q & A ) It is about time aeromodellcrs joined together to stop this unnecessary rule changing. YOUR QUESTIONS Ψ Hartlepool. E . C. S t a n t o n . From the tone o f your letter It Is obvious that your club is completely ANSWERED φ out o f touch with the governing body for Aeromodt lling in G. Britain,— the S.M.A.E., 19 Park Lane. London, W. 1. D e a r S i r , Rules (particularly those for C L) are only changed as necessary I recently purchased a plan of the TOPSCORE from for reasons of development or safety. Alterations are first suggested your Plans Service and have been unable to obtain the at Club levels through Area Committees to the S.M.A.E. Council hho then consult the appropriate specialist Sub-Committee. Rule d.anges DURAL required. Can you help me by letting me know are made known to members either by issue o f a revised rule book or where I can get it and its approximate price. an amendment sheet but not until Area Committees have had opportunity Taunton. P. S. Cole. for voicing opinion on sight o f a rules change draft. 1* 63 rules have just been dealt with in this manner and all clubs should be a Hare o f Messrs. J. Smith and Sons, 42-54 St. John's Sq., London, E.C. 1 are what has happened through their representatives on the Area Committee. most helpful in supply o f non-ferrous materials. A telephone call to The case in point, concerning 2.5 c.c. T Racing defeats our under· Clerkenwell 1277 Dept. 2 will find Mr. A. Judge who can ad\ise on standing. Almost 3 years ago, the 1959 Rule Book amendments metal grudes and estimate cost for remittance. Orders mav be phoned announced adoption o f the F.A.I. specification for 2.5 c.c. T R and at and collected nr mailed. Dural, NS4. aluminium sheet or tube is held in the same time, area was increased from 125 to 186 sq. ins. total, fuselage vast stock. Modellers can use ntanv oj the offeuts and since metal is cross-section was increased from 1.6 h v 3 ins. to 1.97 b y 3.94 ins. 7 his sold by weight it is better to seek advice before ordering. was notified to all members o f the S.M .A.E. through C lub Secretaries. Unfortunate!v the I *>60 Rules Bonk repeated the cancelled specifica- D e a r S i r , tittns but this was corrected by the S.M A.F. Contest Newsheet. Subse­ The state of the management of the rules governing quent additions to the International ( lass of 7 earn Racer are fuselage model aircraft in this country is shocking. It seems that cross section to be 6.045 sq. ins. minimum, * heel diameter I in., line thickness .0118 ins., (single cable not permitted). These additions were about once a season a committee meets to change the announced bv AfROMODlLLFR January 1961 P. 13. They were not rules “just to break the monotony”. Take the case of a implemented officially until the Criterium of Acrs in Belgium, September fellow clubman who had just bought an ETA 15 and 1961 and do not affect S.M .A.E. events until 1962. In answer to your final point. It is about time tome S.M.'A.E. members decided to build a team racer for it. His cash was pretty took advantage oj their democratic institution and became more aware low and it took him about three months to get it finished o f current events. and he was all prepared to go to a comp, (after much practise) when someone informed him that the so called D e a r S i r , “governing body” had just changed the specification. I am very intrigued by a gliding holiday, sometime When he checked lip on his ‘plane he found that the next year, but as 1 am only 16 and live in Sussex I would wing area was insufficient and also that the fuselage like to have the names of any gliding clubs in this region, cross sectional-area at the cockpit was also insufficient. Haywards Heath. T. J. S. Bishop. How long arc aeromodellcrs going to stand for this A full list o f Gliding Clubs offering holiday courses is available from the British Gliding Association. Londonderry House. 19 Park la n e , nonsense, for not only is it stupid and unnecessary but it London. W .\. Note also the addresses of the Clubs ofjering their services dissuades newcomers to the hobby from entering serious to Aeromodellcrs on page 98 o f this Issue. 74 February, 1962 SCALE MODEL NEWS

T h e r e i s a considerable increase of interest in flying and solid scale modelling if we are to judge by the volume of correspondence wc receive at our offices. This miscellany of photographs indicates how great is the variety of scale applications. Top left is G. E. Whitehead of Earby, Lancs, with his Mitchell III bomber, powered by an Elfin 1.49 and an E.D. Bee, and which he scaled up from I/72nd drawings in volume III Aircraft o f the Fighting Powers. Flown regularly at Baildon on 35 ft. lines, it is 33J in. wing span, weighs 22 ozs., flies at 65 m.p.h. on full power and 40 m.p.h. when cruising on the larger engine. As seen, the model is very neatly camouflaged in 180 Sqdn. R.A.F. insignia. Flt./Lt. T. E. Dodds of R.A.F. Cosford has a particular yen for the unusual. Photo at top right shows four of his rubber-powered “twins”, now six years old and still going strong, all to 1 /24th scale and being a Northrop Reporter, B25M Mitchell, P82B twin Mustang and DH Hornet mark III. These models have direct drive motors, furnished cockpits, and sprung undercarriages. The Reporter is the most spectacular flier but all more than justify the effort in their construction. In the background is a diminutive Miles Magistcr. The next picture shows his latest effort, a 24 in. span model of the R.C.A.F. Beech C-18 Expeditor as used for a test bed with a turbo prop engine mounted on the nose. This ideal opportunity to “cheat” with a single rubber motor in the fuselage and free wheeling airscrews was too much for Flt./Lt. Dodds to resist. Even more out of the ordinary arc the magnificent models made in brass to the same scale of 1 /24th by Les Morgan of Gloucester. The Supermarinc S6B and Spitfire are on display at the Royal Aeronautical Society in London. More than 1,000 hours work was involved, including the intricate preparation of detailed templates and hardwood dies for the brass work involved. Both models have movable control surfaces and fuselages made in half shells of 1/64 in. copper sheet, which is riveted in assembly and the cockpit completely furnished as a separate unit with floor and fore and aft bulkheads. The Spitfire has a retractable undercarriage, castoring tail wheel, variable pitch airscrew, working flaps, sprung main legs, sliding hood and hinged rad. shutter. Mr. Morgan is now working on the last of his scries, the Gloster Whittle Jet. Finally, a control-line scale model of the Republic P-47 Thunderbolt made by P. Groos of the Haarlem Club in Holland to 1/15th scale for an E.D. 2.46 racer diesel. The rather high weight of 40 ozs. is well absorbed by the telescopic undercarriage legs, and flight is most realistic. The model was entered at the first International scale event at the Crlterium o f Aces in Belgium last September, and was the Dutch champion C/L scale model for 1961, as can be expected from this realistic view. February, 1962 75 DaauLSB

Is undercamber necessary J —by W erner Thies

a fascinating examination of airfoils by German experts, · translated by with interesting findings (first published in Mechanikus) · Hans Justus Meier

E a r l i e s t t y p e s o f airfoil closely resemble our value achieves its maximum at high lift coefficients, “modern” model sections of the curved plate variety. i.e. at high angles of attack, and these airfoils appeared In his book on aerodynamics the British scientist to satisfy requirements, systematic research and tests of F. W. Lanchcstcr tells of the models which he used thin, flat-bottomed airfoils were neglected. during 1895-1905 for his experiments, some results of When author Werner Thies compared the airfoil which are still valid today. The majority of his models charts of the Go 795 and 796, compiled by G. Muesmann featured very thin and heavily cambered airfoil sections of the Goettingen aerodynamic research institute in {Fig. 1). Apart from the method of construction, this 1956/7, with those of the Gb 801, 803 and 804, which airfoil shape is, of course, nearly identical with the one had been tested by Schmitz and G. Kraemer, he was advocated by the late Stud: Ing. F. W. Schmitz. His shocked to find that the results of the flat based airfoils study of model aeronatics, which earned him the Prandtl were much better than those of the under-cambered ones award, proved the point that at low Re-numbers, Le. at Rc-numbcrs of 50,000—100,000! This contradicted ail at the speed at which models fly, thin and cambered previous results, and demanded a more thorough airfoils will yield optimum flight performances {Fig. 2). investigation of the matter. For almost twenty years, between 1920 and 1940, The M.V.A. airfoils were tested at Re-numbers of thick airfoils were the vogue, following the general 74,000—100,000, using rectangular wings of approxi­ trend of full-size aircraft of that period. The era of these mately 28£ by 4j in. and 31 £ by 6£ in., respectively, at a thick airfoils came to an abrupt end, when Schmitz’ wind velocity of approximately 29.5 ft./sec. No effort book was published. His study olTcred completely new seems to have been made to reduce the turbulence factor aspects for the design of model airfoils. Professor of the wind tunnel to a value which would permit Alexander Lippisch, underlined the importance of airflow conditions approximating those in the free Schmitz' work by publishing wind tunnel results of the atmosphere. The wind tunnel balance used for measuring well known Goettingen airfoils M.V.A. 301 and M.V.A. the lift and drag forces, (which at these low speeds 123, which had been tested during W.W. 1, when Dr. amount to fractions of an ounce only) was probably the Munk, and Ernst Huckel undertook systematic tests best available at that time, but no doubt was not good with a family of airfoils in the original small wind tunnel enough to ensure exact, valid results. In the two diagrams of the Prandtl institute at Goettingen. These results were the polar curve of the Gb 801 airfoil, (which is identical published in the Technical Reports of the Flugzeug- with the earlier M.V.A. 301), is compared with the meisterei Adlers hof vol. 1 and 2. latter's polar found in these early tests. The diagrams, While studying these reports, Lippisch found that these {Fig. 3) clearly show that the earlier drag values are two airfoils would yield extremely high performances if approximately one half of those found today under much used in model gliders. In fact the introduction of these more accurate testing conditions. These drag values do airfoils resulted in a marked improvement in perfor­ not match until a Rc-numbcr of 168,000 is reached. mance and led to the development of a large number of Similar results arc obtained when comparing the M.V.A. similar airfoils, like for instance, the Gb 417, Gb 495 123 with the nearly identical airfoil Gb 803, (developed and the popular Bencdek-developcd scries. by the well-known aeromodcller Max Hacklinger). Now the high performance of relatively thin and highly Obviously the drag values of the earlier tests arc much cambered airfoils results from two properties: («) too low. These extremely low drag values of the M.V.A. because of their small nose radius they fly in super­ airfoils were, however, responsible for the complete lack critical conditions even at small Re-numbers (i.c. 50,000— of interest in further research on flat-bottomed airfoils 60,000) and (b) they achieve high lift coefficients. Since, of medium thickness. apart from wing loading, sinking speed is governed by While F. M. Schmitz gave the critical Re-number of the so-called power^factor alone (0-*/CDa)jind as_this the airfoils tested by him as 60,000—80,000 in his book Fig. I Lanchcstcr 1905 model. Fig. 2 Go 417a polars. Fig. 3 Comparison of early and recent tests on identical airfoi s. EliUERi 76 February, 1962

“Aerodynamik des Flugmodells", it was obvious that were tested by G. Muesmann in the Goettingen wind models equipped with these airfoils flew super-critically tunnel as part of a scries of flat bottomed airfoils of at much lower Re-numbers. One explanation for this different thicknesses (tubulencc factor of the tunnel is phenomenon seemed to oficr itself: the roughness of the 1.05). The results for these airfoils and the earlier paper covered or balsa planked leading edge or front mentioned ones have been corrected for an aspect portion of the wing, protruding leading edges and spars ratio of 10, this being a value very often used in acro- etc. sufficed to induce a supercritical airflow over the modclling, and compiled as polars in Fig. 6. A Re­ top of the airfoil. In his final tests, following suggestions number of 75,000 was chosen, since it can be assumed made by Werner Thies and other modellers, F. W. to represent actual conditions on a model wing at actual Schmitz put a paper covered model wing (airfoil Gd 801) model speeds with adquatc similarity. in the wind tunnel. Results of this test confirmed the Lowest drag values are offered by the Gd 795. The expectations, and results are graphically shown in three other airfoils in turn seem to be nearly identical Fig. 4, which contains the polars of the Gd 801 airfoil generally, considering inaccuracies in measurements and at Re— 75,000 and of a paper covered wing (P.M. 801) airfoil contours, excepting the maximum lift coefficients at Re 42,000. Over the whole range of practical angles of of the Gd 801 and Gd 803, which are higher than those attack the measured lift and drag forces of both airfoils of the flat bottomed sections. arc very nearly identical. For the ensuing evaluation we (lilide ICatio may therefore safely assume that the results of airfoils, tested at Re 75,000 in a wind tunnel with low turbulence Simplest way to make qualitative studies is to compare factor compare reasonably well with those of average the glide ratio of airfoil sections. The glide ratio, which model wing having the same or similar airfoil at Re modellers often erroneously call glide angle, is the 40,000—50,000 as regards lift and drag values, provided ratio of the altitude loss to the distance flown. As the the parameters are reasonably alike. result is a fractional value the reciprocal value is A few months before his death, F. W. Schmitz succeeded commonly used for convenience’s sake. This represents in finishing his tests with the Hacklinger designed the flown distance divided through the altitude loss. Gd 803 airfoil. This section has a maximum thickness Aerodynamically the glide ratio represents the ratio of of 6 per cent., a mean line camber of 7 per cent, and a the drag of either plane or wing to the lift obtained from nose radius of 1.2 per cent, of the wing chord. Schmitz it, or the ratio of the drag coefficient C d to the lift selected this airfoil because of its popularity in aero- coefficient CL. Hence the reciprocal glide ratio is calcu­ modelling circles and the availability of results of flight lated by dividing the lift coefficient by the drag coefficient tests, made with an A/2 model built by Max Hacklinger in question. himself. This model had been flown both with and In order to make things easier for the reader, the glide without turbulence wire, to study its effect on the critical ratios, corrected for aspect ratio 10 model wings, are Re-number. As in the case of the other section these compiled in Fig. 7. At first glance it will be noted that the test results show the same characteristic “fanning” of Gd 795 with the L/D ratio of 20.4 excels, and even the the polar in the critical Re-number range. (Fig. 5). thicker Gd 796 is still much better than the two other With turbulence wire the critical Re-number is airfoils. He who wants a fast model with good penetration approximately 40,000 for the Gd 803, and 60,000 less should, therefore, select the Gd 795. But he should not turbulator. Performance of the A/2 model equipped with overlook the fact that the lift/drag curve of this airfoil turbulator was measured by Max Hacklinger himself, has a very pointed contour. In plain words: the optimum while results were evaluated by X. F. Wortmann. The glide ratio is restricted to a very limited and narrow model flew at Rc40,000, the aspect ratio was 19. In the range of angles of attack, this in turn requires very practical anglc-of-attack range; at high lift coefficients careful trimming. of .97 to 1.27, these flight tests showed drag coefficients which were .01 lower than were to be expected from Power Factor wind tunnel tests, i.e. the model flew better than wind Matters are somewhat different when sinking speed is tunnel tests had predicted. The measured mean sinking considered. The lower the rate of sink, the higher will be speed was .85 ft./sec., which amounts to a glide time of the duration of the flight. It is the ratio of altitude loss 192 seconds from a tow launched start with the 164 ft. during flight to the latter’s duration. From the aero­ line, (under still air conditions). dynamic point of view, sinking speed is mainly governed by two factors: wing loading and power factor, the The (iid 705 and (>o 700 Airfoil» latter in this case being defined as the ratio of the square During the 1950—1957 period the Gd. 795 of 8 per of the drag coefficient and the cube of the lift coefficient. cent, thickness and the Gd. 796 with 12 percent, thickness This being again a very small fractional value, the

Fig. 4 Far left. Tunnel and paper covered tests compared. Fig. S Centre. Flight test polars. Fig. 6 Below, four comparisons, flat base and undercambcred.

0 0

------. 002 Q0* Q06 0.09 QW Q02 QOi 0.06 0.06 0.05 OJO CD~ — CD *“ CD>0 20

Ο 2 4 ------6 e ► to* Angtt of ottock *C*> reciprocal value CLs/Cdj is generally used. The larger lift coefficients than those where the boundary layer is this reciprocal power factor, the lower will be the sinking laminar. Hence one tries to create a turbulent boundary speed of the model, the longer will it fly. On evaluation layer over that part of the upper surface, where a pressure of profile charts one soon discovers that the optimum rise is bound to occur. If, with very low Re-numbers, power factor occurs at higher angles of attack, i.e at. turbulence of the boundary layer cannot be induced higher lift values (Fig. 8). This is the reason why one by the shape of the airfoil itself, then tabulators arc prefers airfoils with relatively high values of Cl max used for this purpose (wires, spoilers, vortex generators for use in gliders. When one now checks the power etc.) factors of the airfoil sections under discussion, the On the bottom rear surface of the airfoil, things are results come as a surprise. For sure enough the best one quite different again. Here we do not have a pressure is not the thin Go 795, but the thicker Go 796 with its rise to cope with at high angles, in fact the contrary Cl max of approximately 1.12. Its optimum value is, holds true, and the boundary layer is generally in the however, only slightly better than the one for the GO 795. laminar state. The skin friction of the laminar boundary Models equipped with these airfoil sections should in layer is approximately one half that of the turbulent theory, fly longer. Whether they actually do so can only boundary layer, and is thus very low for the lower be proved by actual flight tests. contour of the airfoil, unless it is induced to become IlMiimlur.v litiyer turbulent through badly finished wing surfaces, corners, There are two principal airflow conditions, which ridges (spars, leading edge) etc. occur in the boundary layer and both have their distinct On airfoils with highly concave bottom contours the advantages and disadvantages. The turbulent boundary laminar range is restricted to relatively high angles of layer with its slight vortices is, for example, advantageous attack, say from ± 4 deg. upwards, and only then is its because of its ability to transport energy from the effect on the overall drag of the airfoil noticeable. At low adjacent flow to the upper surface of an airfoil; it is angles of attack, separation of the boundary layer thus capable of preventing separation of the airflow by must be expected on the bottom of these sections aft of a pressure rise, which takes place near the rear end of an the leading edge, creating a strong tendency to dive. It airfoil. In other words; airfoils with turbulent boundary should be clear that the drag of flat-bottomed airfoils, layer over the upper surface of the section attain higher which at angles of attack as low as 0 degrees still show an extended laminar boundary at the bottom surface, is Below: Profiles of airfoils mentioned in text. Ordinates on page 90. smaller. Consequently this part of the airfoil should be given its full share of attention (Fig. 9). Alexander M. Lippisch once wrote: “ . . . it is very important to know that the bottom part o f the model (and even a fullsize glider) wing is the sacred side. In order to achieve optimum values o f LID (lift:drag ratio) and sinking speed the bottom part of the wing must be kept as clean and smooth as possible (smooth enough to make a fly break its legs on it).” These words should not require any additional comment. Flaf-lrnffim inl Airfoil Advantage'* Not only do the G5 795 and Gd 796 airfoils offer advantages over those with camber, judging from this test data, but they are also much easier to use. Ample proof of the latter characteristic is their general applica­ tion to elementary models with their simple and robust wing construction. In addition, such wings possess inherent torsional stiffness. There is need to remind anyone of the trouble which cambered sections cause in this respect. The centre of pressure travel is governed by the camber of the meanline of the airfoil. If the camber is small, so is the centre of pressure travel’. The airfoils generally used for glider and rubber powered models have mean line cambers of approximately 6 per cent, compared with mere 2.4 per cent, for the Go 795 and 3.7 per cent, for the Go 796. This means that for a given size of tailplane the moment arm can be safety reduced, which in turn decreases the moment of inertia accordingly. In other words such models will recover still faster from any displacement. Continued on page 90 z a s a a 78 February, 1962

D u r in g the l a s t ten years, preoccupation of model tailplanc rests ensuring that they are at 90 degrees to glider enthusiasts with the A/2 class has tended to leave the fuselage sides. Cement metal tube sleeving for the large, open class, glider out of favour. Prior to this auto-rudder line through the fuselage sides at F.7 and decade of ascendency of the international class in behind F.15 and thread Nylon cord through these tubes, competition, the Open Glider reigned supreme. Results entering the fuselage at F.7 and reappearing at the rear of the 1961 rallies indicate that the “wheel of progress'* tube. Now sheet the top crossgrain, with & in. balsa. has swung full circle and that this type is, once again Sand the tin to shape and symmetrical section from beginning to command greater interest. Experts such as i in. sheet, separating the rudder and cementing a metal Jim Baguley and Laurie Barr have used this type in tube to its leading edge. Insert 20 s.w.g. wire hinge pin competition for some time, but perhaps the greatest through the base of the fin, through the rudder tube and 1961 success story comes from that consortium of up, burying it into the wood above. Cement this assembly experts in the St. Albans M.A.C., B. Cox, J. Simeons, to the fuselage, and add the underfin, ensuring that both I. Crawshaw, D. Tipper and G. Fuller, (who represent fin components are vertical to fuselage. Carve pine or four aircraft companies and a leading model wholesaler) hardwood noseblock and attach to F.l, followed by responsible for Number 96a presented here. The design 20 s.w.g. wire nose skid. designed ... Number by the experts of one of the leading clubs proved . ·. 96a in three contest seasons easy ·.. to build and fly with simple lines St. Albans’ for Inexpensive and very quick open glider construction FULL SIZE COPIES OF THIS l/6th SCALE REPRODl has, in the last three seasons, amassed a fine record of achievement, including three 1st places at the South Midland Area Rally and in the “Model Engineer’* Cup for 1961 and 1959, 2nd places at the 1959 Devon Rally, and Croydon Slope Soaring Rally, 3rd places at the 1959 Surbiton Gala and 1961 “ Model Engineer’*. Planned at the St. Albans permanent clubroom, Number 96a was originally intended to be a lightweight of around 16 ozs., but subsequent experiments proved the performance of a 20 ozs. example to be superior. Eight prototypes have flown, all but one having placed high in competition. The last three performed straight from the building board with no adjustment to rigging, weight or turn! Begin construction with the fuselage, cutting sides from medium & in. sheet, 4 in. wide for the nose section. Scarf join the sheet sides around F.IO, arranging the joints in opposite directions. Cut F.5 and F.7, again from £ in. medium sheet and assemble with the fuselage sides. Cut the remaining formers from soft sheet to save weight and cement all but F.5a and F.6a into the fuselage where indicated on the plan. The fuselage bottom is i in. medium sheet scarf jointed around F.3 and cemented in place. The | in. ply plate is cemented to the floor ahead of F.6 through the top of the fuselage. This is to hold screws for the 20 s.w.g. dural plate wing brace stay, after the completed fuselage is sanded. Bind and cement the formed 16 s.w.g. towhook to a £ in. by $ in. hard balsa strip and cement the assembly to the base. Now fit remaining formers F.5a and F.6a then add wing and February, 1962

Sand fuselage and cover with lightweight tissue. Fit wing retaining dowels, autorudder and tailplane stops. Cut the tailplane ribs from quarter grain 1/16 in. sheet balsa. Sand the trailing edge to shape from a j in. by ft in. strip. Notch for ribs and pin to plan, packing up 1/16 in. to allow for camber. With leading edge pinned in place, cement ribs and spars. Sand to fine finish and cover with lightweight tissue. Fit d/t hooks. All but the centre eight 3/32 in. wing ribs are also cut from quarter grain 1/16 in. sheet. Sand the trailing edge from 1ft in. by ft in. strip and notch for ribs. Make up the tongue box from 1/16 in. ply, gluing and binding with silk. Pin leading and trailing edges to plan, tapering leading edge tip from ft in. sq. to ft in. by 7/16 in. The trailing edge should be packed up ft in. to allow for camber. Cement all ribs in position and face root ribs with 1/16 in. ply. Affix tongue box and inboard spars. (If preferred, the spars for both wing and tail can be Above: St. Albans added by pinning the spars over the ribs, then notching Clubstcrs enjoying their spoils at the to fit spars). Where necessary, spars should be relieved S.M.A.E. Prizegiving at root to accommodate box. Crack wing at dihedral with Cups. Trophies break and apply dihedral on tip panels with 1/16 in. ply and Certificates — plus the enormous braces. Cementing the outboard wing spars and all Farrow Shield. They gussets in place, (including four ply keepers), tip blocks won both the team and strut hook, binding latter in place. Sand all over and events for Rubber and Glider, gained cover with heavyweight tissue. Finish wing construction first th ree placings in by bending the 1/16 in. thick dural wing tongue, ensuring the team Power con­ that it fits tightly into the boxes. A loose fit can be taken test, but narrowly missed adding up with thin paper glued to upper and lower faces. that Trophy to Fully assemble the model, shaping and adjusting the their list. N um ber wire dihedral struts for desired dihedral angle. Rig the 96a has of course, autorudder assembly, tensioning the rudder with a contributed greatly to their success. rubber band and ensuring that the rudder returns to At rig h t: is the tail- exact neutral position when the nylon auto-rudder is tip-up for dethermal- actuated on tow. Add thread dcthcrmaliser tailplane ising, a vital opera­ tion with such a stop and bullast as required to bring the C.G. to desired m aximum · m aking position as indicated on plan. design as the Num­ If completely true and warp free, the model should fiy ber 96a. Note auto­ rudder tab set for satisfactorily straight off the board. left turn on thcglide.

CTIONJARE AVAILABLE AS PLAN G.8I4. PRICE 9/- PLUS 6d. POST FROM AEROMODELLER PLANS SERVICE. 38 CLARENDON ROAD. WATFORD Famous Biplane Left: Unmarked PT-I3D, note forward exhaust ring. Above: Bill Adams’ streamlined and acrobatic version Number 30 . . . by with cowled Wasp Jr engine ready to take wing rider Judy Cole through m anouvres. Dick Stouffer picture.

A l t h o u g h it was not the last military biplane to be in the United States it has been fitted with a 450 h.p. designed and built in America, the Stcarman “Kaydet” Wasp Junior—more than twice the original power. will be remembered as the last to go into production. Bill Adams, former winner of the Aerobatic Champion­ It was remarkable too, as the first aircraft to meet the ship in America, flics a similar machine fitted with a specifications of both Army and Navy; never before cowl and spinner, spats and headrest and resplendent had the two services completely reconciled their differ­ in a scarlet and white colour scheme. ences in requirements. Designed for rapid manufacture and maintenance, the The “Kaydct” was a biplane in the classic American Stcarmans had a fuselage and tail assembly of welded style, with its radial engine (strange that it was never chrome-molybdenum steel tube. The fabric covering cowled!), minimum upper dihedral and heavy stagger. to the fuselage was supported by light alloy arches and Also characteristically American were the large cockpits stringers; the cowling panels were of dural. The wings, with a high scat position necessitating ample windscreens, fabric-covered, had wooden spars and ribs with alloy long travel undercarriage, and a beautifully smooth compression ribs. All struts were metal, and the simple exterior and well finished. undercarriage assembly could be detached by removing Developed from the NS-1 of 1934, the Lycoming- just four bolts. powered PT-13 appeared two years later. Twenty-six machines were delivered to the Army, followed in 1937 The writer acknowledges with thanks the generous by 92 PT-13As with slightly increased power and different help given by Mr. H. D. Hollinger of Boeing, Wichita; instrumentation. Another increase in power distinguished Mr. (Jordon S. Williams of Boeing, Renton and Mr. the PT-13B, 255 of which were built in 1940 to meet the Harold Krier in the preparation o f scale drawings. demands of an expanding training programme. Six Fact*» nn

ARMY & NAVY. Blue and yellow PT-17 with rear exhaust collector on Continental engine and serial 732 on vertical rudder strip of Army mark­ ings. At rig h t: Line up at the Stearm an factory of thirteen N2S-I Navy primary trainers in bright yellow. Boeing Airplane Co. picture*. Β eray 1962 February, 81 m m m f Co* / γτΤ π VI \ l 1 II— f II Γ7Τ 1 ji 6u 0 A 6. 5 ^ o—iI I — n i I π\ 3

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COLOUR PT 13 D LOCATION OF LETTERING 0·. BRIGHT BLUE - FUSELAGE (SOLID BLACK) COLOUR - N2S-5 ALL STRUTS A LL YELLOW SPACER S' CHROME YELLOW - WINGS V 12 I/48TH SCALE REPRINTS OF THIS "A" TYPE PLAN AND I/36TH SCALE MF" TYPE DYE-LINE TAIL PRINTS ARE AVAILABLE AS PLAN PACK 2753 FROM AEROMODELLER PLANS SERVICE PRICE RIGGING WIRES NUMERALS ON FUSELAGE BLACK(BOTH SERVICES) WING WALKS, HANDLES, SENSENICH WOODEN PROPELLER ALUMINIUM WHEEL DISCS COCKPIT EDGE PADDING & TAILWHEEL CUFF. BOEING-STEARMAN PT 13-17- 18 N2S-I - 2 - 4 ~ r 5l FT. ΡΤ 13 D NUMERALS

MCCAULEY STEEL PROPELLER

T------«5

LYCOMING R-680-17

1 1 ||\ ^ I j . U \ J 1___J _ a I 84

ENGINE ANALYSIS No. 92 By R. Warring

F o l l o w in g the fam iliar V c c o design layout, the hours running time to free up completely, running at model 35 C is a tough, robust glow motor developing fairly high speeds. Running at lower speeds with a maximum power at somewhat higher r.p.m. than the large diameter propeller and rich mixture produced radio control version, with control line combat applica­ little improvement. Once freed up, however, the engine tion in mind. Like all the other Vcco models we have could not be faulted as regards starting, handling or had through our hands the 35 C impresses as soon as consistency of performance. it is taken out of its box and general handling character­ This initial tightness was confined to the top of the istics and performance more than live up to expectations. cylinder and a most unusual feature to find on a Veco Although a large engine, it is extremely easy to handle engine. There was no question of the main bearing being and an excellent starter, even on small diameter propellers. tight. The class of fit adopted by Vcco for the crankshaft Adjustment is not critical and running is consistent at is what could literally be called “a rattling good fit”— all load speeds. lots of slack but nothing to cause trouble and in point of All Veco engines arc manufactured with “temperature fact a very good bearing in view of the generous length controlled clearances.” Basically, this means simply of shaft. Fit is, however, slack enough for a considerable that piston and cylinder finishing is carried out under quantity of fuel to escape via the front end, pumped out controlled temperature conditions, working to close of the crankcase—helpful in keeping the bearing cool but tolerances, resulting in close and regular fits which should wasteful of fuel and also tending to make the engine a eliminate any necessity for running in. The instructions rather dirty runner. state that Veco engines do not need bench running for Our test measurements did not realise the B.II.P. break-in, but do recommend keeping the needle setting figure claimed by the manufacturer (.65 B.II.P.) but the slightly rich for the first hour or so’s use. figure of .535 B.H.P. at 14,000 is a very reasonable one This particular engine received from the production for a plain bearing motor without excessively "doped” line for test proved the exception to the rule. It was fuel and is perfectly adequate for control line stunt and definitely tight—so sticky, in fact, that it was reluctant combat work. The 35 C is also most tolerant about to two-stroke or even run at all for more than about fuel seating and tank position, although for combat twenty seconds at first, then slowing down and stopping. installations a pressurised feed is recommended by the It needed the equivalent of something like one or two manufacturers. An outlet fitting is, in fact, supplied for this purpose, basically a hollow bolt replacing the top left hand screw holding the crankcase back cover in place. The tapped hole for this screw is diilled .ight through the crankcase casting and opens into the bottom of the transfer passage, thus providing a pressure port which is normally sealed by the cover screw for normal running. With pressurised feed the venturi insert in the intake can be removed, resulting in a measurable improvement in performance at some slight loss of easy starting characteristics. The venturi insert is held in place by the spraybar. A substantial cast crankcase unit incorporates long and well braced lugs, being carried well forward along the front bearing length. The transfer passage is cast in on the left hand side and the bore machined to take the Θ 9 tO U !2 f j m ts f6 liner. Although a ridge is left at the bottom of the bore R P M - THOUSANDS the liner actually seats on a shallow flange machined on its top. It is then held in place by the head attached with six short screws. The liner itself is of soft steel, ground externally and honed internally to finish. Liner o/d is .90 in. for a bore of .7845 in. Exhaust and transfer ports are purely rectangular in shape and almost equal in width and depth, the overlapping the exhaust be about 85 per cent, of its depth. The whole liner appears to have been tumbled after initial machining since all sharp edges arc rounded ofT and have the characteristic appearance of this type of treatment or of a cast liner. It is an easy sliding fit in the crankcase unit, but the cast head, which February, 1962 85 is machined to match the top of the liner, is quite a tight Fit on the liner flange. No gaskets arc necessary to seal. The head is of conventional finned pattern with the plug well offset to the exhaust side. The piston is machined from cast iron with wall thickness reduced to a practical minimum. A fully contained deflector is incorporated. Suitable gudgeon pin bearing area is provided by local thickening i.e. removing an ovoid section from the top section of the inside of the piston. Gudgeon pin diameter is quite small—only 5/32 in.—and is of the fully floating type, hollow with copper eyelet-type end pads. The connecting rod is of flat section light alloy, machined from solid with a loose fitting bronze bush for the big end bearing. The crankshaft is machined from steel, hardened and Working parts show offset plug in cylinder head and square cut ports. left quite hard and finish ground over the bearing length. bearing. Probably this, as much as anything, is responsible Main diameter is a generous .475 in., tapering sharply for the amount of fuel which escapes via the front of in front of the bearing to a | in. diameter threaded the bearing. Its purpose is to ensure that lubricant docs length. An almost square induction port opens into a reach the front of the bearing. 11/32 in. hole in the shaft. The web is cut away and The propeller driver is a relatively shallow light alloy quite heavily counter-balanced, the shaft itself in fact casting locating on the taper length of the shaft with a being heavily overbalanced (although not completely conventional washer and nut assembly for the propeller. offsetting the weight of the reciprocating components). There is an adequate length of shaft and threaded length Main bearing consists of a bronze sleeve, presumably to accommodate all sizes of propellers. Spraybar and cast in with the crankcase unit and honed to finish. needle valve assemblies are of brass, cadmium or dull The fit, as mentioned, is very slack, but the bearing nickel-plated, with a plated steel ratchet lock. surfaces appear true and good with no signs of wear Summarising, despite the fact that we had to run after several hours running. No oilway is provided down this engine in for some time to achieve proper perfor­ the sleeve—nor is one needed with the class of fit employed mance, we still have every admiration for the quality of but a smaller hole is continued down the crankshaft design and workmanship and the performance achieved past the intake port and connects with a small drilled with Veco engines. The 35 C is a really good engine, port through the crankshaft wall near the front of the rugged and very well made, and very reliable.

Specification: CylinderJOiner): mild steel (unhardened) P ropeller— R P M F igures Displacement: 5.743 c.c. (.3502 cu. in.) Piston: cast iron dia x Itch r p m Bore: .7845 in. Connecting rod: light alloy 10 x 6 Top Flite 11,300 Stroke: .725 in. Crankshaft: hardened steel, f in. N.S.F. 10 x 34 T op F lite 13,200 Borc'Strokc ratio: 1.08 propeller shaft thread. 9 x 7 Top Flite 11,800 Bare weight: 7* ounces. Cylinder head: light alloy pressure die 9 x 6 Top Flite 12,600 Max power: .538 B.H.P. at 14.000 r.p.m. casting 9 x 6 Keilkraft nylon 11,700 Max torque: 44 ounce inches at 10,500 Glow plug: 1.5 volt clement, ceramic 9 x 4 Kcilkraft nylon 14,900 r.p.m . in su lato r 9 x 6 Frog nylon 13,600 Power rating: .094 B.H.P. per c.c. Main bearing: plain, bronre bush 10 x 6 Frog nylon 11,200 Power weight ratio: .0655 B.H.P. per Crankcase back cover: light alloy 1 1 x 4 T o rnado 11,200 ounce pressure die casting. 1 1 x 6 T o rnado 9,000 Material Specification Λ1 anu/ucturcrs: 12 x 4 T o rnado 9,700 Crankcase: light alloy pressure die Veco Products Corporation, Burbank, 12 x 5 T o rnado 8,700 casting California, U.S.A. Fuel used: K cilkrafl R ecord N itrex 15. W m ι3 3 0 3 1 Ο ι3 λ Ι 86 February, 1962

T h i r d m a n i n the U.S.A. stunt team for the World Championships will be Ed Southwick from California. Bob Palmer placed second in the first eliminator but did not compete in the second and judged instead. Travel to a far away place in Europe is likely to cost a Californian as much as £100 out of his own pocket and Bob reckons once, in recent years, was enough! The Team Race equipe is drawn more from the Eastern States where models are influenced considerably by British and Hungarian design features and use the well known British engines. Team placings in the final eliminator were:—

Stockton and Jchlik East ... 5:12.5 Edwards and Edwards East ... 5:27.6 Duncan and Bard Midwest ... 5 : 40.8 Strathmore Team Race circle we illustrated on page 12 last month is to be used as a stimulus for interest in the Detroit area with monthly contests for F.A.I. Team Racing right through from April to September 1962. Some idea of the intensity of organisation in these parts may be gathered by the fact that the Strathmoor M.A.C. 16th annual contest will be for 53 trophies costing $600 and we have no doubt that such encouragement coupled with the inherent American flair for producing extra­ ordinarily well finished and designed models will eventu­ ally bring them through to the top in international racing. In Chicago the indoor flying season has opened and a set programme of events for models ranging from Removal of loading restrictions for free flight in the U.S.A. and re- hand launch gliders to pre-fab models, microfilm and introduction of the 60 class will paper covered stick models is set for every Saturday of bring forth many models like Bob each month at the Madison Street Armory-—Just another Bowen's 1,250 sq. in. Ram rod, Spitfire powered from Stockton, way in which a club manages to bring itself head and Calif.Laxman Twins FINLAND are seen shoulders over the rest by finding and providing facilities. with th eir F.A.I. models, above, they use Oliver and Cox TD and Pan American’s decision to discontinue their sponsor­ belong to successful Kiuru Club. ship of the PAA Load Events after fourteen years of activity through executive Dallas Sherman and Educa­ tional Director George Gardner has placed the AMA in a small quandary. Admittedly enthusiasm was beginning to wane in the U.S.A. Engine capacity was limited to .020 which, of course, meant that it was virtually a one engine competition. On the other hand, the cargo class offered a great challenge when modellers started to develop new forms of construction to reduce the loading on the wings and gearing to improve engine efficiency in a low speed model. Boundary layer control is surely just around the corner of development. The need is now for another sponsor to continue the stimulus opened up by PAA and with more CHIQUITA flexible rules to make the by Theo Von’T Rood event more open to everyone. Another point for discus­ sion in the AMA is the question of international team selection methods. This is by no means limited focing to the U.S.A. for it is becoming plainly obvious 4th Ploce 1961 that many nations arc con­ Benedek- 6435 b World A /2 cerned with the desirability to put their aspiring team Pic above: 1961 Stunt Champ, Chomps of BRAZIL. Geraldo Gama, members through more with his 0/d Antarea and Leutkirch. flights to prove consistency Aldabaran models. 900 + 131 sec and also there is a strong Unique by virtue of its taper wing this DUTCH design, and welcome move to which was one of the finalists in the 1961 World Champion­ ships, is also uncommon with hgih wing and tapered tips. February, 1962 87 n m DDE HUE R increase the number of flights at the Finals to remove the luck element more effectively. As this column is being prepared for press our friends “down under” in Australia are heading from all parts to Echuca, Victoria, for the week long 15th Annual Nationals from December 28th to January 4th. A characteristic feature of the Australian Nationals which could well be adopted in this country is the final presentation Dinner which makes for a grand get together for all concerned. Vancouver is one of the keenest centres for the hobby in Canada and is certainly the most productive quarter of the entire world as far as Club News Letters are concerned. They also have an interesting contest w'hich might be popular elsewhere. Known as Thompson Trophy Racing the rules are purposefully simple. Left from SWEDEN, Goran Andersson’s B om bax, a combat model with a tail! Span 33 ins., length 22iins., weight with Oliver Tiger about 12} Maximum engine 2.5 c.c., minimum span 20 in. but the ozs., placed 5th and 9th at the Criterium of Aces last year. Right: Speed model to be a 1/12th scale version of an actual Thompson Champion of ARGENTINA is Carlos Zorzoli, seen here with his latest Trophy Racer (pre-war) and must have the same colour Super Tigrc G20 F.A.I. design. scheme as the original. Line length is 52 ft. 6 ins. and tank size ΙΑ II. oz. This permits profile models as any Wc have all seen models in productions from Holly­ construction is allowed and with the exciting variety of wood and Elstrcc Studios but it is rare indeed that wc Gee-Bee's, Coudrons, Folkerts, Lairds, etc. it’s not hear of acromodcllcrs helping in cinefilm production in surprising that there is quite a following. Speaking of the U.S.S.R. Leningrad Clubsters produced a fleet of news letters, we have a list which is available free on 6, 1-16 Fighters, 3 Junkers 88s and 4 Mcsserschmitt 109s receipt of a stamped and addressed envelope, giving our for “The Baltic Sky”. Sixteen times the control line fleet current register of interesting bulletins issued by Clubs was flown for the cameras over ice on the Finnish Gulf. and if any other Club wishes to join the register it should Incidentally, one gets the impression that U.S.S.R. submit a sample to the Editorial offices. teams in International events arc nearly always composed Foreign magazines this last month have brought of the same group of experts and this might, in turn, forth a strange coincidence in design trend, for the give the impression that there are relatively few Soviet Rumanian 2.5 c.c. diesel 1.0.R., the Russian “Rythm” modellers engaged in the F.A.I. competition classes. 2.5 c.c. racing diesel and the American Gilbert engines That this is not correct is now evident from figures 1.2 and 1.7 c.c. for ready to fly plast’cs all use an inclined quoted for the 1961 Championship where 300 entrants down draught type rear carburettor! apparently passed a classification test and in the A'2 Winner of Wakefield at 14th Hats, in AUSTRALIA, was Joseph Kenyon class, 44 took part in the final contest at Chkalova Ohio from A.P.S., an ideal novices design for this class. Centre is Charles aerodrome, Moscow. The fact that Sokolov and Sotich, b ro th er of A. M. A. President from Chicago, U.S.A., w ith his paper Averianov placed 1st and 2nd in strong competition is covered stick model for indoor flying at the Chicago Armory. Right, in JAPAN, Bunzo Yanigimachi with his D-C Dart .5 c.c. diesel $A model and surely a sign that as in any other country, supreme T. Yoshida with an Italian type A/2, show that they favour high aspect experts always filter through to the top. ratio and International selection of equipment. m m m 88 February, 1962

No. U Sqdn. K.F.C. Derived from what was known as “The Wireless Unit R.F.C.”, the Sqdn. Hew the varied types of BF.’s until receiving RE8’s in May/June, 1917. No details of markings are known for BF. aircraft. When using RF8 the Sqdn. Marking (carried from June, 1917 to March. 1918) was a R.E.8 with 9 Squadron marking and individual numbers as used from single white band painted be­ June 1917 to March 1918. This particular “21" crashed on August 16th, hind the cockade on the fuse­ 1917 near Boesinghe, France. lage. This band passed over the top decking. Individual markings were by numbers painted in white be­ R .F.C . M |IIX. M ARKING S hind the Sqdn. marking and repeated on the top decking. Numbers normally ranged PART FIVE from I to 24. After March, 1918. when Described by Leslie A. Rogers Sqdn. markings were discon­ tinued on two scalers, the Drawn to I 72nd scale by Ken McDonough same pattern of individual markings was used. X». 45 S

M ore r a d io m o dellers arc turning to borrow half the balsa stockof Roland Rees C lu b activity it seem s, for in the S O U T H E R N Ltd. to illustrate his talk on balsa selection, AREA a new club has been formed. Southern C L IJ B N E W S also using several identical wings, some Multi Flyers arc at the moment ten R C built with incorrect grades of wood, amply enthusiasts in the Brighton area, and equip­ Portsmouth and D.M.A.C. held their illustrating the importance of careful balsa ment is, unfortunately limited to multi­ annual Combat and Tree Might events Over selection. Some future lectures will be "Use channel equipment. NVe do hope this is not two week-ends. P. Dempsey won Combat in of Tools” and one on Naval Aircraft by the going to be a National trend, following not very high wind and Free Flight on the U.S. Navy. Very clever innovation is a altogether happy instances in other countries, following Sunday was marred by thick fog. competition for the best written club report notably the U.S.A. and S. Africa. There’s Two juniors, E. Ycrrcll and R. Elliot won every month, the best to be supplied to room for all enthusiasms in any club and if Rubber and Power to the embarrassment of A eromodeller for inclusion in Club Hews one particular branch feels itself more some seniors who made up for this only by and ensures an interesting supplement. important than the rest, then it has no place T. William’s win in Glider. Mill Hill and D.M.A.C. welcome new in the movement. Some “modellers” tend to First Club to catch on to the Coupe members to their A.G.M. on January 23rd act with eyes and thoughts blinkered to their d’Hiver Specification, detailed in December at Dollis School. Mill Hill. Proceedings own channel of operation without thought AfromodiLLER, together with Garter Knight start at 8 p.m. Attractions to prospective for others, including those on whom they plan, appears to be the SOUTH EASTERN new members arc excellent control line depend for organised events. The S.M.F. AREA’S Woking and D.M.Ac., who will be facilities and the radio control section, may find their closed shop an embarrass­ holding a F/F Rally to include a contest to members having six A.P.S. BiekFs. ment. although for the moment they arc this specification. Other events will be 1961 has been yet an o th e r successful happy. Rubber, Glider. Power, JA Power, Chuck season for St. Albans M.A.C., who won the A m ong o th e r things, their m em bers already Glider. We personally are very pleased to Pluggc Cup for the second year running. All ow n fo u r F. and M. relayless 10-channel see such an early and favourable reaction by praise must go to the core of consistent superhets. one O rbit 10 rclaylcss and one modellers to the Coupe d’Hiver class, and fliers they have, but thanks loo. to those who Space Control outfit. Fortunate men! They all credit to the Woking boys for announc­ gave vital help in retrieving and searching are also enterprising in having a private field ing their intention with plenty of time in for lost models. In the face of un ever with take off and landing strip, which, because hand for those interested to accustom them­ increasing standard of competition, their it is surrounded by cornfields, has led to the selves to Coupe d’Hiver models. Date of the success over the past season was gained insistence on multi channel equipment in an Contest is not yet fixed, but will be between only by many hours of development. effort to ensure that all flights terminate at April and July. S.M.A.E. sanction is to be Norwich M.F'.C. in EAST ANGLIA have the landing strip. Most members fly just for applied for. been doing a spot of R.T.P. flying in their the love of it. but they also have Harry Over to the LONDON AREA now, where clubroom, with scale and speed models. Brooks, regular competition flier. To date, Cosmo A.C. arc holding a ..cries of uero- Naturally the hot rods appeared, D. Green­ two supcihct models. Sm og Hog an d Gee mndclling quizes on club nights with prizes ing’s all sheet job being the most lethal. String, have flown together, and shortly an for the winners at the end of the series. Stevenage M.A.C. in the SOUTH MID­ attempt will be made at formation flying, Current leaders, J. Curling, P. Crowhurst LAND AREA, have produced another first- with four superhets. and D. Dixson. are all juniors, but with class edition of their newsletter "News and Most ambitious project however is a seven rounds yet to go, all is not yet over by Views” in the November·December number, 9ft. span. Space Control equipped job, a long way. Subjects range from Engine devoted mainly to Control Line and Radio already built and shortly to be flown fitted Recognition, to Balsa selection by sight Control, though this is not always the ease. with an Eumig Electric cine camera. alone and recently the Hon. See. managed to Contents include a three-view drawing of a lOoz. Combat model by Ian Tanner, and a discourse on the merits of various R/C kits. 1962 S.M.A.E. Contest program m e Hatfield M .A.C.’» film show on Novemerb th was a great success, depicting their M arch 25th 10 June 24th modelling activities through the past year. •Κ.Μ.Α.Λ. Cup (U R Glider) Area Gamage Cup (U R Rubber) Decen­ Frog Senior Cup (U/R Power) G. Cresswell’s modelling experience has } Pilcher Cup (U/R Glider) tralised been put to good use whils» engaged on tlie April 1st Ju ly 8th Hatfield Group’s project to compete Control Line, Speed and Stunt C entral­ Area Championships C entral­ for the Henry Kramer £5.000 prize. ised ised In the MIDLANDS. Leicester M.A.C. Ju ly 15th held their 25th Anniversary Annual Dinner April 8th Control Line Speed and Stunt C entral­ •Astral Trophy (U'R Power) Area on December 9th, sixty members and friends ised enjoying half a chicken each, plus trimmings. Flight Cup (U/R Rubber) SCOTTISH GALA They now have 170 members, but still do April 29th R.A.F. Ju ly 22nd First Control Line Trials Bark- not intend to limit membership in any way K.L.M. Tropliv (U R Power) (good show'.). Winter activities include a First Radio Control Trials ston C.M.D. Trophy (U/R Rubber) H eath Bring and Buy sale and the winter building (U/R Glider) competition, the subject being the M ercury M ay 13th Taplin Trophy (R/C Mono control) M arauder. A prize of £5 will be awarded to Team Racing (Classes A and B) C.M.A. Cup (U R Glider) Area first member to develop a silencer, which •Guttcridgc Trophy (U R August 5th will be followed by a “silencers only” rule. Control Line Speed and Stunt R ubber) C entral­ A lively, sometimes heated discussion took M ay 27th R.A.F. ised place at the NORTH WESTERN AREA Second Control Line Trials I B ark· August I9tli A.G.M. over the cost of entry fees for Area j ston S.M.A.E. Cup (A/2 Glider) l Area Second Radio Control Trials •Kcil Trophy (Team Power) / contests. The eventual decision being a H eath charge of 16 for seniors and d. for Juniors, J NORTHERN GALA 6 to be doubled on the day. The secretary BRITISH NATIONAL CHAMPIONSHIPS August 26th Hamlcy Trophy (U/R Power) reported his receipt of a letter from the .lime I Oth authorities at Tern Hill airfield, giving first Caton Trophy (U R Rubber) Thurston Cup (U'R Glider) and final warning concerning litter. This Womens Cup (U'R Glider (U R Glider) untidiness on the part of R/C fliers, who did R ubber) S.M.A.E. Trophy not dear away all the wreckage of their R/C Seale (R.C. qualifying (R C Multi control) pranged models, necessitated the use of a flights) P.A.A. Load (Class A) mechanical .weeper to clear the mess, Gold Trophy (C.L. Stunt) Team Racing (Classes )A. A and B) holding up full size flying for two hours. In Knokke No. 2 Trophy (C.L. future, anyone observed dropping litter will Seale qualifying flights) C.L. Stunt Team Racing (International Speed immediately be removed from the airfield. C lass) U.K. CHALLENGE MATCH Wallasey M.A.C. extend a warm welcome Combat (Heats) R.A.F. September 16th to all those youngsters in their area who are Speed Bark- Halifax Trophy (F.A.I. Power) \ Area in difficulty with their Christmas Kits and done 1 1 th ston •Farrow Shield (Team Rubber) J engines. Such an ofler is well worth con­ Super Scale Trophy (f/f Seale H eath September 23rd sidering for it is a chance for the inexperi­ qualifying flights) Control Line Speed and Stunt C entral­ enced to obtain the best from their new Sir John Shelley (U R Power) Afromodfli.fr T rophy ised models. Contact D. J. Millachip, 55 Model Aircraft Trophy (U/R (R.C. Multi control) GIcnavon Road. Prenton, Birkenhead. G lider) September 30th The date of the NORTHERN AREA Ρ.Α.Λ. Trophy (Pay Load, Class •Model Engineer Cup Winter Rally has been put back to February C lass A) (Team Glider) Area 25th. 1962. The venue is provisionally Ripmax Trophy (R.C. Mono Weston Cup (F.A.I. Rubber) f Elvington airfield (South East of York); control) Power (JA) j contests will be Open Rubber Power Glider, Team R acing (C lasses |A an d B) O ctober 14th |A . Single R C. jA. F.A.I. T R and Combat. Combat (Finals) White Cup (U/R Power) The date is definite: if no airfield is available Speed Frog Junior > Deeen- then Baildon Moor will be the place—but if Scale classes (Seale judging) (U;R Rubber, Glider) J tralisedthere, then no T/R. T he C lubm an. 3 3 90 February, 1962

W o r l d < li;iiii|»ionslii|>N p r o g r a m m e * 1962 C/L R ussia, Kiev, Septem ber 1-7. R/C Great Britain, Crunlicld (dale to be fixed). Indoor G r.at Britain, CardingtOO (lat# September). 1963 F/F Austria, Wiener Ncustadt. RIC Belgium, Ghent. 1964 C/L Hungary, Budaors. Indoor Not allocated. 1965 F /F and R /C Not allocated.

1966 C/L and Indoor Not allocated. International ( outlet I alnular I February 11 Finland, Helsinki—Free Flight for Power, Rubber and Glider, June 11-12 France, a I M aubeuge, Aerodrome Saiemagne - Free Flight, Control Line (Speed, Acrobatics, Team Racing, Combat). Radio Control, Powerand Gliders in two categories Power and Flying wings. July 8, 9, 10 Germany (Hummcrich, Coblenz)—International Competition for Sloj e Flying on a magnetic Course; Radio Control rudder only gliders. July 25—28 Jugoslavia, at Varazdin: 9th International Vertex. Cup Competition for Gliders and Team Racing. August 1—4 Jugoslavia, at Lesce Bled Xth Critcrium of Europe, for Power models; individual and team. August 8—9 my, i/esselberg—Competition for Slope Flying on a magnetic course (Havana Cup). August 13— 14 Jugoslavia, at Spilt—8th International Hydro Cup of Jugoslavia; for Power and Rubber. Aug. 31—Sept. 3 Jugoslavia, at Pancevo—International Competition for Flying Wings, Gliders and Power and Rubber Sensation of several rallies during the latter part of 1961, was Frank Van engined models. den Bergh’s red and white latest S w eeper, has near delta shape wing of Aug.— Sept. luindesverband Saar (E u ro p a C up, Saar). only S4in. span. Orbit 10 relaylcss radio and steerable nosewheel, plus Sept. 28 30 Austria, at Licnz—“Internationales - Dolomitcn brakes, makes taxi out before take off a joy to behold. Has a prototype Pokal-Fliegcn*' for Radio Controlled models. Merco 49 in front. Rudder only, for Gliders and Power.

Is undercamber necessary? (cont. from page 77) the expected manner. When we check the airfoil charts of the Gb 795, we find that it attains its optimum lift n ie lli Trsls value (C l .7—.75) quite near the stalling point. On a Following suggestions made by Werner Thies a fellow comparatively small model having a wing with no aeromodeller constructed an A/1 wing with the Gb 795 washout, asymmetrical stalling of one wing panel is airfoil. For a wing chord of approximately 4 | in. it bound to occur under transverse flow conditions; this used a leading edge jj in. wide. Though not expertly in turn results in quite uncontrollable flight behaviour. finished, its performance was nevertheless up to present Slight washout should therefore be incorporated in the standards in all respects. outer wing panels, when using such airfoils. For a long lime airfoils with straight or only slightly It £ f t iim £ concave bottom surfaces have been used for power Author Werner Thies has evaluated new scientific models and they have yielded excellent results both in data. Theoretical results and practical data indicate climb and glide. The Benedek designed “B 84/52-b”, that the commonly used thin and heavily cambered destined for use in power models, is almost identical modern airfoil sections do not guarantee optimum to the Gb795. Λ radio cont rolled glider of A/2 dimensions, performances for model work. Contrary to general built by Werner Thies, is equipped with the Gb 795. opinion, flat-bottomed or only slightly concave airfoils This model possesses very good llight characteristics and are not only advantageous from a constructional point high performance. of view but they seem to be superior performance-wise A Wakefield model was built to test a wing with the at low Re-numbers. To believe that the performance of a Gb 795 section. For a wing chord of 5 in. the rib spacing model is solely governed by proper airfoil selection was I in. Sag between wing ribs was very slight but would, however, be a misinterpretation, since other initial test flights were disappointing. The glide, when factors must also be considered, which may well have a handlaunchcd, was very flat and the model behaved in more decisive influence on final results.

% Station 0 1.25 2.5 5.0 7.5 10 IS 20 30 40 50 60 70 80 90 95 100 r 417 U pper 0.65 2.5 3.5 5.05 6.25 7.05 8.15 8.85 9.3 9.15 8.55 7.55 6.25 4.5 2.4 m 1.2 0 Lower 0.65 0.05 0.25 0.7 l.l 1.5 2.2 2.8 3.65 3.9 3.65 3.2 2.5 1.7 0 8 0.4 0 495 U pper I.IS 2.8 3.5 4.55 5.35 6.0 6.95 7.7 8.55 8.75 8.35 7.5 6.2 4.45 2.45 1.3 0 ·■ Lower 1.15 0.35 0.15 0 0 0.1 0.45 0.85 1.65 2.35 2.8 2.95 2.75 2.15 1.2 0.65 0 803 U pper 1.3 — 4.5 5 9 7.1 7.9 9.0 9.6 10.1 10.0 9.3 8.1 6.5 4.7 2.7 1.7 0.5 b Lower 1.3 — 0.1 0.55 1.3 1.9 2.7 3.4 4.4 4.9 5.0 4.8 4.2 3.2 1.8 0.9 0 b i. 804 U pper 0.7 — 3.0 4.1 5.0 5.7 6.9 7.7 8.9 9.4 9.5 9.0 8.0 6.3 3.7 2.1 0.3 a Lower 0.7 — 0.1 0.3 0.6 1.0 1.6 2.2 3.15 3.65 3.7 3.7 3.4 3.0 2.3 1.5 0 Cm 4” 796 U pper 3.6 5.6 6.6 8 8.9 9.7 10.7 11.5 12.0 11.8 II .1 9.7 7.9 5 8 3.3 2 0.6 Lower 3.6 2 1.4 0.7 0.4 0.2 0 0.1 0 0 0 0 0 0 0 0 0.2 ς, 795 U pper 2.4 — 4.4 5.3 5.95 6 45 7.15 7.65 8.0 7 9 7.4 6.5 5.25 3.85 2.2 1.3 0.4 ■M • Lower 2.4 — 0.9 0.5 0.25 0.15 0.05 0 0 0 0 0 0 0 0 0 0.1 ■■ mb 801 U pper 1.2 3.8 5.15 6.8 8.0 8.9 10.2 III 11.8 11.6 10.75 9.45 7.7 5.5 3 1.7 0.4 z Lower 1.2 0 0 0.2 0.4 0.6 1.0 1.4 2.0 2.2 2.1 1.95 1.6 l.l 0.5 0.25 0 • m 301 U pper 4.3 — 8.3 9.9 — 120 13.4 14.2 14.9 14.7 13.9 12.5 10.8 _ Cm < 8.6 6.2 3.5 b Lower 4.3 — 3.1 3.3 — 3.7 4.2 4.6 5.2 5.4 5.3 5.2 4.9 4.3 3.8 • 3.2 b 123 U pper 1.0 2.8 3.6 4.9 5.8 6.6 7.7 8.4 9.0 9.0 8.5 7.6 6.2 4.4 2.3 _ 0.2 #3 0 Lower 1.0 0.1 0.2 0.6 l.l 1.6 2.4 3.6 3.6 3.2 2.6 2.0 1.3 0.7 — 0 February, 1962 91 m s m

START W IT H BRITFIX FINISH WITH HUMBROL Yes, top modellers the world over know that the Britfix range of adhesives and the Humbrol finishes stand supreme for all modelling needs. Many of the leading kit manu­ facturers recommend you to use B ritfix 66 Balsa Cement and Britfix 77 Polystyrene Cement for their kits, along with Humbrol Enamel to provide the supreme finish on almost every kind of model. There is also the Humbrol range of fuel-proof Dopes for the flying model, all going to make the most complete range of top-class modelling accessories.

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AUSTRALIA’S LEADING HOBBY CENTRE THE MODEL DOCKYARD CATERS FOR ALL MODELLERS-THE BEGINNER, THE EXPERT

A W IDE SELECTION OF READY TO FLY MODELS LARGE RANGE OF RADIO EQUIPMENT

i n c l u d i n g * BONANZA • O .S . ■ AIRACOBRA • HINODE ■ DAUNTLESS • E .D . • CORSAIR • BONNER

These models are fitted with the mighty self-starting These leading manufacturers bring to you a full range Wen-Moc motors. They are presented in attractive see- of transmitters, receivers and all accessories designed through lid boxes. for trouble-free flying. THE MODEL DOCKYARD ™ 216 SWANSTON STREET MELBOURNE AUSTRALIA m m m 92 February, 1962

NEW FOR 1962! SFPER-l’ItEFAimil ATION

57 SPAN RADIO CONTROL FOR ENGINES 2.S-3.5 c.c. SINGLE OR MULTI CHANNEL • NEW LINES • NEW LOOKS • PREFABRICATED • MORE FLYING • LIGHT AND STRONG DE LUXE KIT WITH DIE-CUT PRE-CUT BALSA AND PLY PARTS — 2 GIANT PLANS — DECALS 3 “AVIOMODELLI·· PNEUMATIC WHEELS — TANK — PRE-FORMED L.G. — BALSA GRADE F.A.A. — ENGLISH — GERMAN — FRENCH INSTRUCTIONS PRICE IN IT A L Y £5.15.0 A V ΙΟΊΟΙΜ Ι Ι Ι · V BHOIVA · ITALY

ELI ABILITY BUILT INTO EVERY SET CONOMIC IN PRICE AND OPERATION

* TONE STABILITY ROVEN PERFORMANCE A FULLRANGEOF achieved by use of "high Q” chokes in all transmitters. Trouble-free operation first time out, with pre­ tuned units. CRYSTAL CONTROL standard on all ACCESSORIES * TEMPERATURE ■multi*' transmitters (optional extra on TRITONE) R.E.P. $ oz. Relay.. 24/- STABILITY MINI REPTONE £17/1/0 R.E.P. | ot . Relay., 26/- Fully transistorised, relayless, special 3-Reed unit 35/- ensured by correct circuit de­ compound escapement. 6-Reed unit 50/- sign and choice of high Receiver unit only £9/12,10. 8-Reed unit 60/- stability components. UNITONE £16/16/2 10-Recd unit 80 - * RECEIVERS Standard single-channel tone unit TRITONE £21/7/10 MOTORISED ACTUATORS totally enclosed, protected MINI-UNIAC 52/6 from dust, dirt and exhaust 3- channel reed 5 oz. valve/transistor receiver Universal motorised actuator. fum es. o n ly £ 10/2/-. O M N I A C ...... 61/- * GOLD PLATED QUADRATONE ... £30/8/10 With five interchangeable reeds on multi-channol equip­ 4- channel reed commutators for single or ment. Require no maintenance. 7 oz. valve/transistor receiver multi-working. only £14/13/7. * HIGH QUALITY S E X T O N E ...... £32/19/1 OLSEN/REMTROL 70/- close tolerance components 6-channel reed For multi-channel receivers used throughout. 9 oz. valve-transistor receiver TRANSMITTER POWER CON­ only £16/9/6. VERTER. I35v. at 25 m.A. O C T O N E ...... £51/10/9 From 6v. accumulator. £8/10/- 8-channel reed Simultaneous Tx. 10, oz. valve/transistor receiver RECEIVER POW ER PACK. o n ly £20/6/2. Transistor D/C converter to operate 22$ to 30 volt re­ YOU CAN ORDER "R.E.P.” EQUIPMENT THROUGH YOUR ceivers off actuator battery (4.8 or 7.5 volts). Size IJ x LOCAL MODEL SHOP * SEND S.A.E. FOR PRICE LISTS. U x $ in. Wt. | oz. £4/2/-.

R A D IO A M D Telephone: WEYBRIDGE 6381 HONNEST-REDLICH LTD., 47 QUEENS ROAD. ELECTRONIC PRODUCTS WEYBRIDGE, SURREY February, 1962 93 ^ ^ 3 0 S Q M 3

Three things happened recently which made us feel rather good. We celebrated our fifteenth anniversary at 308; we had an all- time record year business-wise in the shop; and the number of Christmas cards we got from our many friends at home ar,d overseas was another record. All of which seems to add up to the fact that after fifteen years we are still giving modellers the kind of service they need. HENRY J. NICHOLLS LTD. Our heartiest thanks are due to our many 308 Holloway Road, London, N.7. staunch regular customers whose generous support has made all this possible. BARGAINS BY MAIL AMERICAN KITS AT REDUCED F RICES TO CLEAR FOR THE RADIO ENTHUSIAST Veron V iscount. 54 ...... £5/14/0 For one m onth only, ending 15th February, 1962. Vcron Skylanc 54" £ 4 1 9 6 BERKELEY KITS. Interceptor 33^" span. Combat model for Graupner Piaggio £4/19/6 Douglas Dauntless C/L Scale. 31* span, for 2.5 motors 2.5—3.5 c.c. Old price £1/1/3. Sale price DcBolt Ercoupe 36" span £2,13/10 c.c.s to 5 c.c.s motors. Old price £4/5/-. Sale 15/-. M ercury Galahad ...... £1/16/- price £2/19/6. Sinbad the Sailor. 50" span tow-line glider. Mercury Acronca Sedan ...... £3/10/6 Piper Tri-Pacer flying scale for F/F. R/C or C/L. Old price 25/6. Sales price 15/11. KK Super 60 ...... £5/7/- Frog Jackdaw £5/19/2 44* span for motors I c.c. to 2.5 c.c. Old price Mustang P5ID. 28" span C/L scale for 2.5 to £2/19/6. Sale price £1/19/6. 5 c.c. motors. Old price £4/2/6. Sale price 49/11. R/C EQUIPMENT Buster semi-scale Goodyear Racer for R/C Pylon or C/L 48" span. Motors 2.5 to 6.5 c.c. Old price P r iv a te e r 15. 60" span F/F semi-scale flying O rb it 8-channel £ 100/-/- £6/7/6. Sale price £4 9/6. boat. Fine model for engines 1—2.5 c.c. Old price R.E.P. O cto n e ...... £51 8/5 Skyray 25" span ducted fan for motors up to £3/8/-. Sale price 49/6. R.E.P. Sextonc ... £32/17/9 I c.c. Old price £2/11/-. Sale price £1/15/-. C essn a 172. 54" span scale m odel for F/F, R/C R.E.P. Mni-Reptone £17/1/- W arhawk 45“ span. Scale stunt C/L. Motors or C/L for 1.5—2.5 c.c., or 2.5—3.5 c.c. respec­ E.D. Single channel ...... £18/13/- 3.5—6.5 c.c. Old price £3/8·'-. Sale price £1/19/6. tively. Old price £4/5/-. Sale price 59/11. E.D. 4 channel ... £31,10/- Super Cloud 51" span Wakefield model. Old Zilch. 38" span stunt-combat C/L model, E.D. 6 channel ... £ 3 5 /-/- price £2/2/6. Sale price £1/10/-. for 3.5—5.5 c.c. models. Old price 42/6. Sale (above with Xtal control 50/- extra) D. H . B ea v e r 48* span scale for R/C. F/F o r price 29/6. F.R. Multi-Servo ...... £3 8 1 C/L. Motors I—2.5 c.c.s. Old price £2/19/6. Royal Rudder Bug. 62" span R/C model for F.R. Engine and trim servo ...... £2/19 5 Sale price £1/19/6. rudder only. Motors .15—.23 cu. in. Old price F.R. Compound escapement ... £2/9/11 Interceptor. 42" span combat model C/L. for £4/5/-. Salo price 59/11. E.D. Duramatic ... £ 4 1 1 6 motor 5—6.5 c.c. Old price £1/9/9. Sale price Impulse. R/C trainer for single channel. Up Elmic Conquest £ 1/ 11/6 19/11. to 1.5 c.c. Old price 42/6. Sale price 30/-. Deans Relay (U .S.A .) ...... £2/2/6

308 HOLLOWAY ROAD LONDON, N 7 HENRY J. NICHOLLS, LTD., Phone NOPlh 4272 m m m 94 February, 1962

4·4·4»4*4·4· 4· 4* 4* 4* 4* 4* 4· 4· 4· 4* 4· 4*4* 4· 4»4» 4· 4· 4*4· 4* 4* 4· 4* 4* 4* 4* 4· 4* 4*4* *1* 4*4* 4· 4* 4· 4· 4* 4* 4· 4· 4· 4· 4* 4· 4· 4· 4· 4· 4· 4· 4« 4* 4· 4· 4· 4* 4· 4·4* 4*4* 4*4·4·4* 4*4· 4* 4**V The BEST ^iinra Hiy*^ in the WORLD i p i s a ® ® i p 4· *4· 4· 4· 4· 4· 4· 4· 4· 4· 4* 4* 4· 4*· 4* ♦ Φ SES9©a®iiEg 4* 4* 4* ·:· O M f · HYDROPLANES •l· T ·:· φ SPEED · 769/V Μ Γ £ f Φ ·!· 57M7 · MP/0 CONTROL •i* φ ♦ · */f f COMBAT POWER ψ φ WHATEVER YOUR CHOICE—THE ETA f 4» LEADS, WHY NOT INVEST NOW? Φ ·!· Ψ E TA I5D ...... £5.1.0 plus £1.0.10 p.t. 4· (If you require more laps use our new ••range-bar" Price 10/- -f 1/11 p.t.) 4· E TA 19 ...... £5. 14.0 plus £1 .3.7 p.t. * ★ The list of ETA 4· E TA 29 ...... £5. 19.6 plus £1 .4.8 p.t. WINS grows more 4* P.T. applies to the U.K. only impressive each Φ week and proves our 4* claim that our produc­ 4* E T A INSTRUMENTS LTD. tion units aro as good as ♦ any reworked special. f 289 HIGH STREET · WATFORD · HERTS ENGLAND v 4· 4* •V 4* 4* 4· 4· 4* 4· 4* 4* 4· 4· 4· 4* 4· 4· 4· 4* 4* 4· 4· 4* 4* 4* 4· 4* 4· 4* 4* 4* 4* 4* 4* 4* 4· 4· 4* 4* 4· 4* 4· 4· 4· 4· 4* 4· 4· 4· 4· 4· 4· 4* 4· 4· 4· 4· 4* 4· 4· 4· 4» 4* 4*4· 4· 4* 4-4.4· 4· 4-4» 4· 4· 4* 4· 4· 4 ·*

GET THE MOTOR THAT’S “ W IT H IT ” THE FIRST HAIL ORDER ‘ MODEL HOUSE* IN THE COUNTRY

BLACK PRINCE 4/4ch. Complete outfit £31/10/- THE BLACK ARROW 4/4 ch. Receiver ... £ 1 5 /-/- E. D. Multi-channel motorised Servo Unit £3/16/8 F. R. 4 Pawl Clockwork Escapement ... £2/4/3 Μ. E. HERON SUPER TIGRE V Diesel 2* c.c. £5; 18'- I c.c. DIESEL D. C. BANTAM 0.75 ...... £1/17/9 MERCO 35 ...... £5/19/6 O.S. MAX III 35 Multispeed for R/C ... £7/18/4 A.M. 15 R/C Version ...... £3/15/9 A.M. 10 c.c...... £3/1/- 53/6 Inc. P.T. E. D. HUNTER ...... £4/2/3 MERCURT JUNIOR MONITOR £ 1/ 2/8 Complete Range of Every Aluke of Kit, Marine Version Engine & Accessory always In stock. 71/11 Inc. P.T.

H.P. can be arranged on any order over £10. ALL GOODS DISTRIBUTION:— BY RETURN POST FREE OVER £2 or enclose 1/6 for post and packin Home: E. KEIL & CO. LTD. Export: MODEL EXPORTS LTD. The MODEL SUPPLY STORES LTD. MANUFACTURED BY:— (Entrance through GODLEYS) 2-8 SHUDEHILL. M anchester 4. Telephone: BLAckfriars 9432 (5 lines). 2 M inutes from Victoria S ta tio n . MAR0WN ENGINEERING LTD OPEN DAILY MONDAY—SATURDAY 9 a.m .-6 p .m . Glen Vine - Isle of Man February, 1962 95 m m m

[ BETTER quality GREATER quantity j IJOY and the FINEST value ever! Enougn tor th e jo b — | JOY-PLANE and o n ly NEW! a bob! I BALSA JOY Joy-plane PLASTIC I CEMENT Fluorescent ENAMEL New and Now available improved quality. Finish in the new econ­ Very quick and omy size tin. 18 hard setting. Quick drying, beautiful colours Penetrates not affected by (including black deeply, heat boiling water, and white) can resisting and petrol and most be intermixed to oil-proof. For diesel and glow provide a wide sticking fuels. range of colours. Resistant to Balsa Wood, Ply, Can be used on Polystyrene, wood, metal, and most fuels. Gives glass hard 4 / Obeche, Spruce, abrasion and wear resisting surface. I / " paper, card, etc. Available in red, yellow etc. and orange. JOY PLASTIC ENAMEL PACK Ideal for Contents—six bottles of Plastic Enamel: marquetry and White, Blue, Yellow, Red, Black; and brush imitation i oz. 1/3 — 2 ozs. 4/- cleaner. All colours inter-mix. Ideal for use jewellery. on P o l y s t y r e n e , W o o d , G l a s s , M e t a l , In long nozzle TU RNBRIDGE LTD., C h i n a , P l a s t e r , C a r d b o a r d , etc. Dries with tubes. 1/6, lOJd. a mirror-like finish. T I f .J Complete with brush and two palettes.O/ U LONDON, S.W.I7

NORTH, SOUTH, EAST OR WEST-THE ROLAND SCOTT SERVICE IS THE BEST ★ SPECIAL ITEMS * ★ POPULAR ACCESSORIES ★ ★ POPULAR KITS * ★ NEW DEAC CELLS ★ ONLY AVAILABLE FROM R.S. Antex I2v. soldering iron ... 25/- Ambroid Stuka Stunt ... 99/- New-Improved DKZ Cells O .S. Max II 35 6 c.c. Glow ... 70/- now Antcx Mains Soldering iron 29,'- Topflite Nobler Stunt 89/- replace older DK type. O.S. Max II 29 5 c.c. Glow ... 65/- Topflite Junior Nobler ... 59/- K. & B. T o rp . .45 R/C ... £ 9 /-/- Antex Stand with brush ... 12/6 DKZ 225, 1.2 v. Button 5/8 F-51 Mustang Multi R/C ... 258;6 DKZ 225, 3.6 v. Pack / - McCoy 35 6 c.c. Glow ... 60/- Varley 2v. 9 amp. Accs ... 10/— 20 Ambroid Charger 48" R/C ... 156'- DKZ 225 4.8 v. Pack... 2 7 /- Webra Record 1.5 c.c. Diesel 45/- Fuel Filters. Miniature ... 2/6 Wcbra Bully 3.5 c.c. Glow ... 60 - Schuco Styrofix R/C Trainer 106/— DKZ 225 6 v. Pack ... 33/- Cclspray Airspray ...... 10/6 •Orion” Multi R /C ...... 150 - DKZ 225 7.2 v. tapped ALL ARE BRAND N EW 41/2 P.V.A. Glue 8 oz. Bottle ... 5/6 K.K. Super 60. 60’ R/C ... 107- DKZ 225 Charger ... 20 - ★ AMERICAN R/C Jap Silk Per Sq. Yd...... 6/- Graupner Piaggio Scale R/C 99 6 DKZ 500 1.2 v. B utton 8/6 EQUIPMENT * Nylon in Blue. Red, Orange, Sterling Mambo 48' R/C ... 66 6 DKZ 500, 3.6 v. Pack 31/- C. & S. 50I Relayless Rx £10/13/6 Pascha 67* R/C Glider ... 53 3 Yellow. Per l{ Sq. Yds. ... 7/6 DKZ 500, 4.8 v. Pack 41/6 C. & S. 502 Mopa Tone Tx £13/18/6 Frog Jackdaw 60* R/C ... 117 6 DKZ 500. 6 v. Pack ... 5 2 /- (Covering Hints included with All Kraft Single Tone Rx £12/6/- Frog Tempest C/L Scale ... 48 2 DKZ 500, 7.2 v. tapped 68 /- Kraft Single Tone Tx £14/6/- Orders for Silk and Nylon) Spectre Stunt 2.5-3.5 c.c. ... 37/6 DKZ 500 Charger ... 2 5 /- Kraft 10 ch. Dual Tx £43/5/- Schuco Glider Winch ... 66/— Tiger Moth 33*. .5 c.c. ... 33/- -.8 ★ POPULAR ENGINES ★ Kraft 10 Relayless Rx £32/3/- Titan Fuel Bottles ...... 5/6 Cessna Skylarc 54" R/C ... 99/6 Orbit 10 Superhet Rx £44/—/— D ural U n d c r c a r t...... 7/6 O v e r 100 k its in s to c k Veco 19 3.2 c.c. Glow ... 115/- Orbit 10 Simul. Tx ... £51/9/- Veco Thunderbird Tanks ... 9/6 Veco 19 R/C 3.2 c.c. Glow 135/- Bramco 10 Simul. Tx £64/—/— Semi Pneumatic Scale Wheels ★ BRITISH R/C Veco 35c. 6 c.c. Glow ... 165/— Bramco Apollo Rx ... £28 14 - 2'— 12/1; 2J'— 14/6; 3'— 19/-. Black Prince/Arrow One Single Enya 15-IB 2.5 c.c. Glow 81/6 Bramco Regent 10 Rx £64/-/- Veco Glowplugs Long Reach 5/2 Tone Unit ... £18/13/- Enya 19-2 3.2 c.c. Glow ... 88 8 Medco 10 Reed Bank £7 17 6 Veco Jet Assemblies ... 7/11 Black Prince/Arrow Four O.S. Pet 1.6 c.c. Glow ... 47/6 Transmite Neutralising £11/15/— Veco Pressure Nipple ... 4/9 Channel Tore Unit £31/10/- O.S. Pet 1.6 c.c. Multi ... 55/— Transmitc Trim ... £11/-/- 4 oz. Clunk Tank ...... 12/- Black Prince/Arrow Six O.S. Max 15 Multi 2.5 c.c. ... 145/8 Bonner Duramito Servo £5/4/- Bruka 200 and 300 c.c. T anks 12/6 Channel Tone Unit £ 3 5 /-/- O. S. Max 35 Multi 6 c.c. ... 158/4 Cobb Ouncer Servo ... £4/10/- x 4" Rubber Bands per doz. 7d. Black Prince/Arrow Eight M erco 35 6 c.c. Glow ... 119/6 Cobb Micro 4 Servo ... £5/5/- J* x 4J* Rubber bands per doz. 2/- Simul Xtal Tone Unit £49/10/- M erco 35 6 c.c. Multi ... 152/- Cobb Control Box ... £5/12/- § ' x 6" Rubber bands per doz. 2/8 Mini R eptone U nit ... £17/1/- ETA 15 2.5 c.c. Diesel ... 119/6 Babcock Mk. II Compound £3/12/6 iV" x 12' Rubber bands per doz. 2/6 Reptone Unit £15/16 6 P. A.W. 1.5 c.c. Diesel 86.'- Annco Multi Servo ... £5/4/— Graupner Wheels per pair 14*—3/5; Unitone Unit £16/15/- P.A.W. 2.5 c.c. Diesel 98/- Hillcrest Motor Servo £2/19/6 2' —4/10; 2 j|"— 6/5; 23*— 10/8 ; Tritone 3 Unit £21/15/- P.A.W. 19 3.2 c.c. Diesel ... 104/6 K raft 10 C hannel S uperhet Rx 3 f — 16/6. Scxtone 6 U nit £32/17/9 Cox Pec Wee .3 c.c. Qlow ... 37/6 with 10 channel Tran­ Mighty Midjet Geared ... 13/8 O cto n e 8 U nit £51,8-3 Cox Tee Dec 010 Glow ... 77/6 sistorised Servo Switcher Engine Test Stand ...... 12/3 E. D. Duramatic Servo ... 9 0 - Cox Tee Dee 049 Glow ... 78/6 7 oz. t o t a l ...... £ 6 7 /-/- Tatonc Tim ers all at ... 30/— Graupner Ultraton Rx 239 - Cox Tee Dec 15 Glow ... 124/- ★ BAISDEN "GG" PULSER * K.S.B. Clockwork Timer ... 28/- F. R. M otor Servo 55/6 E.D. Super Fury 1.5 c.c. D ... 79/6 For Proportional Rudder and Graupner Unimatic Servo ... 55/— F.R. Lightweight Actuator 25/3 E.D. Racer 2.5 c.c. Diesel ... 82/7 Elevator. Extensively Pre- G raupner D uom atic Servo 114/11 F.R. 2-pawl Clockwork 41 5 Holland Hornet .049 ... 65/- fabbed kit with motor £8/5/- E D. Multi Servo ...... 76 8 F.R. 4-pawl Clockwork 44/3 Fox I5x N ew Item ... 657- ALL ORDERS OVER 20/- POST FREE. OVERSEAS ORDERS ARE ACKNOWLEDGED BY AIRMAIL AND FORWADED FREE OF TAX. CREDIT TERMS ON ANY ORDER OVER £12. ROLAND SCOTT LTD. 147 DERBY STREET, BOLTON. TEL: 21097 Ιμ Μ ρΙεΜ ειθ 96 February, 1962

Send Η.Μ 6 d . tor a specimen copy PUK-KA CLEAR & COLOURED Puk-ku Clear Dope gives tissue a transparent of light but flexible, tough cellulose finish, fully DOPES waterproof with just the correct tautening properties. Puk-ka Coloured Dope, in a wide range of colours, lives a long-lasting, AIR PICTORIAL fightweight finish. Dries in 10-15 mins. The monthly magazine for the air enthusiast Covers completely and aeromodeller. Packed with vivid photo· with smooth, brush- mark free, high graphs and drawings of latest—and older - gloss finish. aircraft you’ll want to model. AIR PICTORIAL keeps you up to date with world air news. On sale on the l i t of each month price 1/6

+ SEND TODAY for your FREE specimen copy to Dept. A/MOD. AIR PICTORIAL Magazines & Publications Ltd.. MARINE ENAMELS & Rolls House, Breams Buildings, London, E.C.4 VARNISHES The actual paint as supplied for sea-going yachts now packed for modellers. Protects your model against sun and sea and gives a first class finish which lasts and lasts. In n wide range of colours. THE MODEL SHOP (MANCHESTER) ★ ★ Return of Post Mail Order Service IP/ FREE OVER £2) ★ ★ R /C K ITS ENGINES VERON CESSNA COX TEE-DEE .010 ... 78/10 SKYLANE ...... 99/6 COX TEE-DEE .020 ... 77/6 VERON VISCOUNT .. 114/- COX TEE-DEE .049 ... 78/10 FROG JACKDAW 119/2 COX TEE-DEE .15 124/- KEIL KRAFT SUPER 60 107/- VECO 19 STUNT 115/- HEGI STYROFIX 106/- VECO 19 R/C ...... 139 6 HEGI BERGFALKE 138/6 ETA . 15 DIESEL 119/11 GRAUPNER PIAGGIO.. 99/6 MERCO 29 o r 35 119/6 EASILY THE BEST GRAUPNER SATELLIT.. 105'- MERCO 29 or 35 R/C ... 155/- STIRLING P.T.I9 73/9 O.S. MAX 15 R/C 147/8 STIRLING WIZZARD . 124/3 O.S. MAX 35 III 150/- EASIEST TO USE TO P FLITE O RION 150/- JOHNSON STUNT 35 ... 2 11/- RADIO CONTROL OUTFITS-AND-ACCESSORIES E.D. Single Channel 118/13/· Graupner Unimatic . S8'6 E.D. Four Xtal 134/010 Graupner Duomatic 114/11 other H.M.G. products E.D. Six £31/10/0 Elmic Conquest 31 16 E.D. Eight £42/0/0 E.D. D uram atic . . 90'6 1I.M.G. "ONE PACK” Hot Fuel H.M .G. All purpose Clear Adhesive. E.D. Eight Simul. £49Ί 0 /0 E.D. Multi-Servo 78 Ί 0 Proof Dope, Straight from the jar! For all non-porous surfaces, or R.E.P. Mini-Rcptonc £17/1/0 Ivy Carrier Rx Kit . . 39'6 No meNsy two-pack procedure, just where instant contact adhesion is R.E.P. Unitonc £16/16/0 Ivy C arrier Tx Kit 49/6 apply to your model for a perfect required. R.E.P. Tritone £ 2 l'l7 /0 NEW! Terrytone All fuel proof finish. H.M.G. Polystyrene Cement. R.E.P. Ouadratone £30/7/0 Transistor Rx Kit 119/6 H.M.G. Heat and Waterproof W'elds two polystyrene surfaces R.E.P. Sextone £ 3 2 Ί7 /9 Rising Compound . . 49/11 Adhesive. For all porous surfaces, together. R.E.P. Octone/Simul. £51/819 Rising LT Weight 2513 except rubber. Used extensively by H.M.G. "Puk-ka” Raisa Cement. Metz Baby complete £21/17/0 R.E.P. 7.2v,'30v. Vcrter 82/6 museums etc. where permanent Modellers’ favourite for years— H.P. TERMS OVER £15. S.A.E. FOR QUOTE 9 OR 12 MONTHS invisible joint is required. fast setting, of immense strength. CONTROL LINE KITS Etc. CHARRON GLIDER VECO THUNDERBIRD 89/- W IN C H ...... 18/11 MERCURY CRUSADER 69/6 COX GLOW HEADS! H. MARCEL GUEST LTD. VERON PINTO i RACER 39/6 010/1.5—7/8 .020/ 049 ... 6/7 KEILKRAFT SPECTRE ... 39/9 VECO CERAMIC PLUGS 7/11 K.B.S. D/T TIMER ... 32/6 Riverside Works, Collyhurst, Manchester 9 DEAC CELLS 500 DKZ ACADA ENGINE TIMER 28/6 7.2v. C /T 68'-. I.2v. — 8/6. ORANGE L/T WEIGHT Telephone COLlyhurst 2644 & 1536 4.8v.—41/6. 3.6v.—31/-. 6v.—52/- SILK ...... 7/6 yd. 13 BOOTLE STREET · MANCHESTER 2 · Tel: BLACKFRIARS 3972 February, 1962 97 m u

SCOTT -IIROSVNE it it Prompt Mail Order Service if if RIVERS RADIO CONTROL ENGINES FOR R/C E Q U IP M E N T Ivy-Aeromodeller A.M. IS m ulti-speed ... 7 2 /- ' Construction Kits O.S. Pet multi-speed ... 52/— M a rk II Carrier transmitter kit ... 49/6 Speed controller only II/- Carrier Receiver kit ... 39/6 SILVER STREAK 2.5 c.c...... £6/3/0 Case and aerial ...... 69/6 FROG 349 multi-speed ... 96/6 (Includes P. Tax £1/3/0) Tone Transmitter kit ... 79/6 ENYA IS m ulti-speed ... I08/6 Tone receiver kit, fully O.S. 35 multi-speed ... 158/4 M a rk II transistorised ...... 119/6 FROG 349 multi-speed SILVER A R R O W 3.5 c.c...... £6/3/0 Ivistor kit, non-mechanical purely electronic relay MARINE ...... II7/2 (Includes P. Tax £1/3/0) device ...... 29/6 Aircraft Kits suitable R/C S.A.E for further details Plus Post, and Pkg. 1/6 In Brit. Isles C.O.D. 2/3 extra E. D. Tuned octave relay... 60/-FROG Jackdaw 60' for single or Bleep relay (fixed) ... 24/- multi-channel. Complete kit TUNED VERSIONS (Either model) ... £2/10/0 Clockwork escapement 59/10 including air-wheels ...II9/9 EXTRA Elmic Conquest escape­ VERON Viscount 54' for ment ...... 3I/II single o r m ulti-channel 114/— Mighty Midget motor Keilkraft Super 60, for plain ...... II /2 engines up to 5 c.c. ... 98/11 OVERSEAS BUYERS g e a r e d ...... I3/I0 Mercury Galahad, single or Mini-Reptonc transmitter, Send International Money Order: receiver and escapement m ulti ...... 36/6 complete ... .. 341/— Matador I-2.5 c.c. ... 25/8 Standard Models ...... £5/0/0 + Postage F. R. 2-pawl lightweight Aeronca Sedan 1.5-2.5 c.c. 7I/8 clockw ork driven escape­ Tuned Models ...... £7/10/0 + Postage m ent ...... 42/— Boat kits and Marine fittings. Lightweight, rubber We stock boat kits by KeilKraft driven ...... 25/8 Veron, Aerokits, Maycraft, etc. ORYX SOLDERING IRON, low Also complete range of marine consumption I2v. electric. fittings by Ripmax and Mersey A. E. RIVERS (Sales) LTD. Ideal for R/C work ... 25/— M arine. Cash with Order or C.O.D. Owing to increase in Postal Charges North Feltham Trading Estate, we have been compelled to revise our terms. We now pay U.K. postage on orders over £2 in value. Under £2 please add 2/-. S.A.E. please for all enquiries. Cheques and postal orders should be crossed. Faggs Road, Feltham, Middlesex, ENGLAND N am es and A ddresses in BLOCK LETTERS please. (’Phone: Feltham 6700) J. SC0TT-BR0WNE ( l J£ eO T T l ) LTD . 5 I QUEEN STREET. NEW TON ABBOT,] DEVON 'Phone:ll79

m

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More and more satisfied clients the world over receive their regular shipments of Equado— such is the popularity of this fine balsawood used by modellers everywhere. Equador balsawood is supplied in metric and English sizes Ql TRADE PRICE LISTS ON APPUCATION TO SOLE MANUFACTURERS AND SHIPPERS

■ ϋιιΠΜΤΠ— — ------— ΕΚΡ ■ 272-274· HIGH STREET · SUTTON E1 AW&S0 N- 4 TD SURREY · Vl6i!ant829l-2 ri' 98 February, 1962

THE MODELSHOP for “SERVICE” ELECTRONICS! ENGINES—M.E. "Heron" I c.c. 53/6; P.A. 1.49 c.c. 86/-; all E.D., A.M.. Frog. D.C. Mcrco and Enya Engine» in itock. *end for list. K ey t o YOUR future KITS—Mercury Viper C/L 17/6; Picador 19/3; Toreador 26/2; Veron An exciting career—a Viscount £5/12/6; Frog Jackdaw £5/15/6. Veron—Frog—Yeoman kits all in stock, full range list free. New Hobby — Your KEIL—Bandit 25/10; Talon 24/10; Caprice 15/9; Super 60 107/-; send for own spare or full-time list. Mini Reptone £17/1/6 or 40/- deposit and 12 monthly payments at BUSINESS? 27/8. New experimental course E.D. Black Prince single £18/16/6 or 40/- deposit and 12 monthly payments of 30/10. includes big kitsfor building Send for K.K. handbook 1961, chock full of information 2/6 post paid. test gear and a complete Anything by Mail by return from: AM/VHF receiver. FREE Brochure from 97-101 BATTERSEA RISE, RADIOSTRUCTOR LONDON. S.W.II BAT63I9 RUSS DEPT. G 121. READING, BERKS.

Read Popular Flying, the bi-monthly magazine of the M MINI-REPTONE rs © w H Popular Flying Association, the representative body of III REPTONE £15/16/6 Σ ultra light and group aviation. Full membership £2 p 2 r UNITONE . .. -£16/15/6 Ul annum. Magazine subscription only: 12 issues 20s. post Ό Λ a . TRI-TONE £21/6/7 free. Specimen copy Is. 6d. from the CD III z a. QUADRATONE £30/7/0 POPULAR FLYING ASSOCIATION Londonderry House, 19 Park Lane, London, W .l. Tel: GROtvenor 1376 D SEXT0NE £32/17/9 III H M X < ALL above items from Stock. a. WANT TO LEARN TO FLY? ill in S.A.E. fo r Lists For as little as £14.10.0 you can enjoy a X GLIDING HOLIDAY t c o I HOSIER STREET, at Britain's Finest Soaring Site. o St. Mary’s Butts, Reading z Send for illustrated brochure to: "Enquiries" a/m, Tel: Reading 51558 MIDLAND GLIDING CLUB LTD., Σ c/o No. I Flat, Hillcroft, Cunnery Road, Church Stretton, Salop

EIFFLAENDER REBORING SERVICE GIG CHESTER ROAD, MACCLESFIELD Please note our NEW SCALE OF CHARGES, which are forced Bud Morgan upon ua by increased operating costs:— REBORES, DIESEL ENGINES 20/- c.w.o. REBORES, GLOWPLUG ENGINES from THE MODEL AIRCRAFT SPECIALIST 25/- c.w.o. C.O.D. (pay the postman) 2/6 extra. All engines are tested and returned post free in U.K. within NEW!! K.K. READY-TO-FLY HURRICANE COMPLETE WITH three days from receipt; all our work is guaranteed for one COBRA MOTOR £5 6 2 month from the time you receive the engine. ENQUIRIES, I PAY CASH FOR GOOD SECOND-HAND ENGINES SPARES, etc., please send a self-addressed and stam ped envelope Second Hand Engines in Stock E D Bee 32/6; A M 10 35/-; A M 25 40/-; A M 35 42/6; ETA 19 75/-; Mills 75 30/-; etc etc W rite. I may have just what you want. GLIDING HOLIDAYS Full range of E D, Frog. A M diesel engines and spares in stock, also We are once again holding our well-known Holiday Gliding Courses ED and REPTONE RadioControl equipment Send Stamped Addressed for beginners. Why not learn to fly at our site in the Cotswolds! Envelope for Free leaflets on all leading makes K K , Veron, Mercury, Instruction in dual-controlled glider by qualified instructor. Terms etc. and S/H list. K.K. Handbook 2/6. Post Free. A.P.S. Handbook from 14 Guineas including Hotel accommodation. Write for 2/6. Post Free. information to Course Secretary, 22 AND 22A CASTLE ARCADE. CARDIFF DILISTOL GLIDING (LI » Tel: Cardiff 29065 39 SHAW GREEN LANE. PRESTBURY, GLOS.

Every model, technical reference TRANSISTOR POCKET RADIOS or historical book on aviation, BI LK PURCHASE ENABLES US TO MAKE plus plans, photographs, THIS FANTASTIC OFFER AM) WITH l^-stamp lor catalogue. MONEY BACK GUARANTEE! B e a u m o n t Aviation Literature The "SAN REMO" . . . so tuned that it brings 2a RidgeAvenue the voices of slur entertainers an d vocalists Winchmore Hill, London. N21 dramatically to life—in your home, office, etc.... Bookshop open Saturday only Only 4jx 2j x ji* ins. fits easily into your pocket or handbag. Works for months off 8d. battery. Should last a lifetime, anyone can assemble it in an hour or two with our easy plan. Complete set of parts including miniature speaker, carrying case—everything only 32 6 4 2.6 p. and p. C .O .I). 2 6 extra. (Parts can be bought separately) GLIDING limited period—so order before it’s too late— LASHAM . W inter Season Weekly Gliding Courses. Νο'ίΐΟΚΕ^ΤΟ PAY DEMONSTRATIONS DAILY Reduced Rates, apply Course Secretary, Lasham CONCORD ELECTRONICS (Dept A.M.4) Gliding Society, A lton, Hants. 210 Church Road, Hove, Sussex February, 1962 99 0 B Q M D

—CLASSIFIED ADVERTISEMENTS— PRESS DATE for issue MARCH. 1962, JANUARY 19th, 1962 FOR ALL YOUR RADIO ADVERTISEMENT RATES : Private Minimum 18 words 6,'- and 4d. per extra word. & MODEL REQUIREMENTS Trade M in im u m 18 w o rd s 12/· a n d 8d. per extra word. Box Numbers to count as six words when costing. ★ Send S.A.E. for complete price lists -fa All replies to be sent care of Advertisement Department, R C AIRCRAFT KITS Telescopic Aer.alt. fully retractable IB 6 K < Super 60. (or tingle or mult* l S 7 4 ft 20 Model Aeronautical Press Ltd., 38 Clarendon Road, W atford, Veron V.,count. for tingle or mult. paw( or TOGGLE SWITCHES, from 2 6 4 paw l 41 4 LEVER SWITCHES. Tx. DPCO. finger- Dur unite. £5, (all unflown); Enya 29 IIIB, not run in, £3 10 -; DeBoli Cosmic Bonner Duram.te multi-tervo 90 - tip c o n tr o l 126 Wind Kit. wing built. £2/10.-. Percy, “Vcllan”. Park Road, Oxtcd, Surrey. f R. clutch mult.-tervo S9 I P U S H -B U T T O N s w k e b e t. SP and DP f r o m 2 6 New A.M.15, modified A.M.10, modified E.D. Racer, E.C.C. Tclccom- MIGHTY MIDGET motor, geared 13 6 MICROPERM midget electric motor 16 - N Y LO N Propellers—7 x 4 up to 12 x 4 mandcr and Receiver, 35/- each; tuned ETA 19, 70,-; Fox 35, 60/-; Durkin, Trantmitter cetei. from 17 6 f r o m J ’- t o 7 '6 14 C lark Street, M orecam be. Receiver cates, from I 6 NYLON covering materal 7 6 yard Cleaning out! Airtrol Receiver, 3 escapements, relay, ammeters, electric motors. E.D. Racer with silencers. Mills 75, 3 sets airwhccls, stern tube, MAIL ORDERS please add estimated postage. Orders over £3 total etc. Offers? Phone Chobham 251 weekends. value post free. 8 channel simultaneous Citizenship transmitter and receiver complete with 4 Bonner servos. £50 o.n.o.; E.D. Black Prince 8 channel receiver, as new, £15; E.D. Black Prince 6 channel receiver, complete with 2 Gem and 4 micro gem relays, £10; Veco 35 R C engine. £4; All in perfect working COSMIC HOBBIES order, inspection invited. Payne’s Radio Services. Market Hill, Chatteris, C am bs. A.M. 15, 40’-; Frog 150, 25,; Better offers taken. R. Adams, 84 Gcils 44 SHEEN LANE, LONDON S.W.14 Avenue. Dumbarton. Mini Rcptonc as new. Phone Lyme Regis 2213. Telephone: PROspect 9375 Fox 15, not yet run in with prop.. 50,-; Fox 35, with exhaust restrictor, 65/-; Frog 150, not used since warranty claim, with prop., 35. -; FR clockwork escapement. 27 6 ; ED (Rubber) escapement, 7/6; Undone crystal controlled transmitter, 120/-; New Fox .09, 30 -; Cobb Pulse box and escapement, 60 -; J. Bygraves, 129 London Road. Biggleswade, Beds. E.C.C. Telccommandcr hand Tx.. 46 -; 951 A Rx.. 40 -; Hill Miniature Rx., 47/-; all perfect. A. Searl. 2 Lincoln Green, Maghull. Lancs. How-to-do-it Rcptonc Tx Rx, as new £8. E.D. Boomerang £60. A.M. 15 M S, just run in £2. D.C. Merlin £1. B intam 15/-. T. Moore, 19 Leighton Road, Wing, near Leighton Buzzard, B-ds. Magazine of U.S. BOOKS Catalogue No. 14 Govcrmcnt surplus and model radio control, over 500 illustrated items. 2 - (refunded on purchase) P P 6d. Arthur Sallis Radio Modeldom Control Ltd., 93(a ) North Road. Brighton. American Magazines. Year’s subscription Model Airplane AYh’j , 39/-. Full catalogue free. Willen Ltd., (Dept. I), 9 Drapers Gardens, London, y i - i Read FLYING MODELS, E .C .2. Model·Avia, the model magazine that covers the world of model flying. the only American magazine Edited in French. Send for free specimen and subscription details. Model- Avia. 31 rue du Printcmps. Bruxelles 5. Belgium. devoted exclusively to Sailplane and Gliding - Published every month. Send stamped addressed envelope for descriptive leaflet; or 3 4 for current copy; or £1 for a year’s model aviation! Every issue includes how-to- subscription to British Gliding Association, Dept. "A ”, 19 Park Lane, London, W.l. build data on new model airplanes of various WANTED Model Shop or business available in early spring. Partnership considered. types (with full-size plans wherever possible) Box N o. 661 . . . worth-while hints .. . photographs . .. how- TRADE Tatonc clockwork Timers D-T (0-6 mins.) and Fuel Shut-Off (0-20 secs.) to-do-it information . . . and features for sport Weight £ oz. Also |A shut-off. 30 - each post free from: Dave Posner, 61b Canfield Gardens, I ondon. N.W.6 . a-plenty! Send 5 - and S.A.E. for the "Phillips” bumper bundle of 1939 45 squadron insignia transfers plus R.A.F. roundels and American stars. Phillips Transfers Published bi-monthly Ltd., Woodford Green, Essex. Ex-Government Stop Watches, 45/-. Illustrated leaflet on request. Charles Annual subscription: (6 copies 15/-) Frank. 67-73 Saltmarkel. Glasgow. C.i. G.20 Super Tigrc Rossi modified, £8. G.2I 5 c.c. Modified. £10. Speed pan including postage for G.20 with spinner. £1. Speed pan for G.2I with spinner. £15-. Four Grades Glow Plug, 4 - each. Vulcan Jet, £12. Modelbrixia, Via Pace. 13 Brescia, Italy. Manufacturers, retailers, and wholesalers surplus stocks bought for cash. Mail your order and remittance today to: Box No. 658. PRIVATE ATLAS PUBLISHING & DISTRIBUTING Co.f Ltd. (D e p t. A) Make friends anywhere—opposite sex (17-70). S.A.E. for details, Personal Column Ltd.. Falcon House, Burnley, Lancs. 18 Bride Lane, Fleet Street, London, E.C.4

Kindly mention AERO MO D ELLER when replying to advertisers R E 3«ΙΜΠΙ ™·*"0" 5569 Γ3Κ«1ΙΕΜ·ΠΒΙ * m m

EAS0872 ™ ™ i i a r c r i s i k d ϋΐιιιιιιιιιιιιιιιιιιιιιιιιιιιιιΐ': imx dee ad lw nie, kits engines, equipment. glow railway model and accessories, diesel and Ripmox, Aeromodeller " o al or upis icuig KeilKraft, including supplies, your all For ALY SPORTS VALLEY N O D AIRCRAFT CENTRAL The obvious shop for all your m odelling odelling m your all for shop obvious The Engines etc. Trains, tested. Boats, Aircraft, Model r to ie r p o r P m o fr n tio n tte a l a n o rs e P H MO L ECCA M EL OD M THE — Veron — ercury M —- KeilKraft t, e rn a B st a E , ad o R ill H h rc u h C 10 Phone your order ANYTIME order your Phone LTD. SCOTT ROLAND without Advice racing. car model control, Agents req u irh m en ts. The show room of th e e th of room show The ts. en m irh u req OE BA KITS BOAT MODEL h m ANT HOBBIES BARNET 6 Bs ass , lo 0, 34 107, also r, o o d passes Bus 261 Ht sw s QHWtW obligation by return postal service. postal return by obligation utai' Mm itiuo for: Distributor Mam Australia's 769 A L U M R O C K R O A D . . D A O R K C O R M U L A 769 5 5 KOI O IK C E 4 D A O R R E T S A C N O D 24 EvL'ER o al edn kt, nie, radio engines, kits, leading all for FE’S IFFE L C W A R 8 E G N A R Y E L L A H W 38 ICAT KITS AIRCRAFT H PERRYS THE C.l C , E , N K L R A U W O B L S E E C M IN R P 5 4 DE TREET E R ST Y B ER D 147 Scalextric — Yeoman — Scalextric M ail ail M 204 W itto n R oad oad R n itto W 204 D N E D R A W O. PTY. ., CO hi ln Service. Plans their AI CONTROL RADIO and r ngham m a h g in irm B N R U B K C A L B " , , " NIE & ACCESSORIES & ENGINES LEY E SL N R A B O MODELS FOR Order Specialists Order 5A 5A S T R E H t . rth o N ,oe Mkr and Maker” ",Model ue pass buses Blakewater 6 Tel: MF Tel: idymnin EOM ELR hn elig o advertisers to replying when DELLER MO AERO mention Kindly the the

e: 27097 Tel: Tel: e: 6222 Tel: 863C0 5713 3918 door.

t r A Y o i l W I i HSEK» K E S lH c M liM GLASG BOURNEMOUTH y vst s e i Bunmouth? Bournem in hen w us visit t o n hy W icat n Ba Kt. l Accessories All Kits. Boat and Aircraft Lists. for S.A.E. Order. Accessories Mail and Engines Kits, makes All IS THE SHOP W ITH THE STOCK STOCK THE ITH W SHOP THE IS al n se h fblu Fr l "5”. "152” ula Form fabulous the see and Call e Roa Bour h West s e W th u o m e rn u o B , ad o R le o o P esnlSrie al Orders Mail Service Personal Radio C ontrol sets, Model Racing Cars Cars Racing Model sets, ontrol C Radio . UTIS SONS & CUTTRISS B. u wrs t or evc fr engine for service your at works Our vrtig o bgne ad enthusiast and beginner for Everything n hby upis n h Fr at Agents East. Far the in supplies hobby and OI AD LSI. OT. CARS. BOATS. PLASTIC. AND FLYING. KITS, SOLID AIRCRAFT OF RANGE FULL n Sl Aet fr .. nie and engines O.S. for Agents Sole and BALSA, DIESELS,BALSA,etc. o Gra Gape, tla Spr Tiger Super Italian Graupner, German for The H MODE SHOP EL D O M THE HANDICRAFTS & L SUPPLIES EL D O M PLANET M ODELS ODELS M PLANET AA C. LTD. CO. RADAR MI X E S E L D ID M , E N O T S D L A E W most most MSHATSUI KOWLOON O O L W O K I, U S T A H S IM S T 95 CLEVELAND S T E E R ST D N A L E V E L C 49-51 2 G ra n d C in e m a B u ild in g s, s, g in ild u B a m e in C d n ra G 2 2 O B S E R V A T O R Y R O A D , , D A O R Y R O T A V R E S B O 2 " CHESTER, X E S S U S , R E T S E H IC H C oe n rcso Engineers Precision and Model OES N HANDICRAFTS AND MODELS WESTBOURNE WESTBOURNE Triang repairs, rebores and rebuilds and rebores repairs, W EALDSTONE EALDSTONE W 8 Manni ne, an L m a h g in n n a M 182 L SHOP EL D O M DE CO. EL OD M CALEDONIA (Opp. Belle Vue School) Vue Belle (Opp. 0 THE HORNET T E N R O H E H T 108 adi r equi t. n e m ip u q e l tro n o c io d ra » Γ • 7 Ar e St, 2 C t., S le y rg A 478 complete Call and see our Shop our see and Call 39 T H E BRID GE GE BRID E H T 39 ” , “ , ” Trix stock stock 100 Mi desb eurn retu by ers rd O Mail " , ” Scalextric aeromodelling f o e: a 5958 Har Tel: Centrol Tel: Tel: Tel: Tel: ” ”

26186

62507 3592 2524 5630

of the following shops. the following of any at requirements aeromodelling of knowledge expert with coupled service Modellers can be assured of personal of assured be can Modellers ff» S B B D μμι μ ιμ I R NSTER IN ERM D KID glggg» w 2 COMBERTON ROAD (opp. Railway Station) Station) COMBERTONRailway 2 ROAD (opp. wish to help you w ith your req u irem en ts ts en and irem u req your enthusiasts, ith w you odelling help erom to A wish are e W aqatr: demise Ditit F.C. istrict D inster idderm K eadquarters: H oe Aircraft Model l mks nie. vr accessory, Every engines. makes all Roadways. Tri-ang and Lone S tar tar S Lone and Scalextric Tri-ang ccessories. A Kits, Flying and and Roadways. Plastic all f o Engines stocks Large IS NIE — R/C — ENGINES — KITS ag sok of l Patc n Fyn Kits. Flying and Plastic all f Engines o stocks Large MAKERS EL D O M THE r-n ad oe Star Lone and Tri-ang Full range of Kits and Accessories. Accessories. and enthusiasts!! Kits The by of here. run range are shop Full needs odelling enthusiasts' M YOUR engines and accessories, boats, cars cars aircraft, boats, odel m accessories, of and range engines plete om C AR BL & SON & BALL HARRY H MODE SHOP EL D O M THE l Hil r , N. .7 .W N , n o d n o L s, u irc C ill H ill M equipment, equipment, NTIG E HV IT HAVE E W — NEW ANYTHING LEIG H M O D EL EL D O M H LEIG L MART EL D O M » & (Next ι 8 ON S T E E R ST N IO R R E M 58 I OR R SERVICE ER RD O AIL M 6 MIE D A O R D N E ILE M 166 7 LWAY ROAD A O R Y A W IL A R 97 Tower nema) a m e in C r e w o T . r N ( «Μ)> H. A. BLUNT BLUNT A. H. & SONS LTD. SONS & e al a Saturday. day all pen O 1 NG S T E E R ST G IN K 51 3 KETGATE T A G T E SK A L C 13 Specialists Order Mail cesre. clxrc Roadways. Scalextric Accessories. lcrc Railways. Electric E.l . N O D N O L CENTRE or o har Royal) Theatre to Door —— ECCA M ANGEL aedypsa service. postal day same n railways. and boats — os — cors — electric electric eray 1962 February, e: STE Tel: Tel: Tel: e: 72673 Tel: Tel: Tel: Tel: 3031 Tel:

railways, MIL railways. 27088 2/891 R/C 1972 2877

® Ε ΐ ! February, 1962 ΙΟΙ 1 Μ Μ Ϊ 1

Tel: PAD 8827-8-9 I M g i a i e m g fd fcM g l T'l: 61591 Κ Κ ϋ Ώ δ Π ϋ λ r" 3920 1 KEN’S MODEL SHOP BURLEIGH’S (N. Littler) JOHN W. BAGNALL 303 EOGWARE ROAD, W.2 57 RAILWAY STREET. MODEL CRAFTSMEN'S SUPPLIES SOUTH WALLS (ROAD) THE MODEL MAKERS' PARADISE NELSON. LANCASHIRE We will put you on the right track with The 100 per cent. Model Shop since 1936 is BURLEIGH of Edgware Road, Ltd. Aircraft. Boats or Railways. — R/C and well worth a visit. Sales and Service with Plastic Kits. Satisfaction.

Tel: NORth 4272 NOTTINGHAM ^ ·* Stevenage 1713 HENRY J. NICHOLLS GEE DEE LIMITED HERTS HOBBYSHOP LTD. 40 GOOSE GATE 4 PARK PLACE, STEVENAGE NEW TOWN 308 H O L L O W A Y R O A D , N.7 NOTTINGHAM

We stock only the best Everything for the aeromodeller at New shop, new stock, keen service to m eet Nottingham's leading model shop your demands. If it’s advertised, we have it, for AEROMODELLERS Full range of all kits, accessories, engines.

Tel: UB 7707 1 ESSES!» T"M2W 1 klteielM gelgb B.M.W. MODELS 161 Kingston Rd., W imbledon, S.W.I9 HOWES MODEL SHOP W. DE VRIES For All Your Modelling Needs 9 and 10 BROAD STREET, TEES MODEL SUPPLIES KITS — ENGINES — SPARES, etc. OXFORD 7 an d 8 SILVER STREET Why not try us? STOCKTON-on-TEES. DURHAM All enquiries welcome. S.A.E. for LISTS LARGEST STOCK IN THE MIDLANDS Full range Keilkraft: Mercury: Veron; MAIL ORDERS BY RETURN MAIL ORDERS BY RETURN Yeoman; Ripmax; Radio Control: Engines; (all orders under 10/- please include pip) Accessories; Boats, Cars, Railways.Plastics tE ffE S !D Tel: HOP 3482 Ι;Τ·"«Ι!ϋ·^Λ 1 ™ I MODEL AIRCRAFT LE-CORE BROS. TEDDINGTON SUPPLIES LTD. For ALL your model requirements MODEL SUPPLIES Aircraft — Boats — Cars — Railways 86. Broad Street, 29 Old Kent Road,'London, S.E.I 264 The Banks, High Street Teddington, Middlesex. ROCHESTER, Kent Aircraft and Boats Kits—Radio Control— The oldest established aircraft shop in and Engines Accessories — Plastics — Tri-ang London. Service with satisfaction 373 High Street, Hornby — Meccano — Scalextric — CHATHAM, Kent. W renn—Highways. ire1gU Te!g| r" 7062 HSMaanMJ T" 77585 11 T" 23382 1 J. G. S. CLARKE REDGATES S. H. GRAIN G ER 46 BROOKWOOD ROAD. MOORHEAD, CALDMORE MODELS S O U T H FI ELD S, S .W .I 8 SHEFFIELD 108 C A L D M O R E R O A D Leading makes, Boat Kits, Aircraft Kits, The North's Largest Model'Dept. Engines and Accessories. Triang stockists Aircraft — Boots — Engines — Kits — Spares Mail Order a Pleasure Accessories—Model Railways— Plastic Kits Mail Order. Model Racing Cars

Tel: RIV 8277 SHEFFIELD 1 Tri. 23512 | MODELS & TOYS SHEFFIELD ELECTRICAL H. G. CRAMER LTD. S4 FULHAM PALACE ROAD. & M OD EL ENGINEERS 172A and B HIGH STREET L O N D O N , W . 6 248 SHALES MOOR,*-SHEFFIELD 3 (Near High Street Station) Plastic Kits; Aircraft Kits; The "0 0 " Railway Specialists Four shops in one. Model Boat Kits; Engines and Accessories Also full stock of Boats — Aircraft — Cars Model Railway, Model Aircraft, Fishing Full size Canoes and Accessories Tackle, Toys.

Tel : BRIxton 5422 |ge]g|»I#I» 1 ΗΠΕΗΐΒΠ» 7" 22938 1 WELWYN L. H. W. WYATT BROS. BALBIR & CO. H. A. BLUNT. LTD. Ill North Bridge Road, & SONS LTD. 260 BRIXTON ROAD. S in g a p o re 38 Fretherne Road. 6 Welwyn Garden City. Herts L O N D O N . W .6 Leading stockists of Model Aircraft Complete range of Model aircraft, Stockists all leading makes of Plastic and requirements in Singapore and Malaya. engines and accessories, boats, cars Balsa Kits. Also ••Tri-ang" and Scalextric and railways. qj Tel: BLA 3972 m Τλ|. - fl1 ■ H S tfe iS I*» WOLVERHAMPTON K THE MODEL SHOP GEE DEE LTD. Tel: 26709 13 BOOTLE STREET M ODELS & HOBBIES MANCHESTER 2 29 HIGH STREET 19 ST. JOHN STREET, SKEGNESS WOLVERHAMPTON THE UP-TO-DATE SHOP WITH THE EXPERTS COME TO US. VISIT US COMPREHENSIVE STOCK All you need in models and toys. AS WELL. W E HAVE ALL THE BEST MAIL ORDERS BY RETURN Therms a Model Railwoy exhibition too. IN MODELLING ■

Kindly mention AERO MODELLER when replying to advertisers 102 February, 1962

keep abreast of developments with SUPER DIESEL ENGINES ETA 15 2.48 c.c. £6, 1/10 TAIFUN HURRIKAN RIVERS 2.48 c.c. £6,3/0 1.48 C.C. £4/13/9 DRABANT 2.48 C.C. £6,7 2 WEBRA PICCOLO G r a u p n e r ENYA I5D 2.47 c.c. £6/1/3 .78 £3/14/5 Novelties PAW 2.49 c.c. £4/18 0 PAW 1.49 c.c. £4/6/0 PAW 19 3.25 c.c. £5 4/6 FROG VIPER 1.5 c.c. £4/1/6 FROG 3.49BB R/C £4/16/8 FROG 3.49 BB £4/0/5 FROG 2.49 c.c. Mod. £4 6/10 AM 10 1.0 c.c. £3/1/11 TAIPAN 2.49 c.c. £4/16/0 AM 15 1.5 c.c. £3/3/11 W rite for LIST o f over 100 types o f ENGINES Send S.A.E. for LISTS o f over 350 PLASTIC KITS JONES BROS. OF CHISWICK S6 TURNHAM GREEN TERRACE. CHISWICK, W.4. (Phone: CHI 0858) (I min. from Turnhom Green Station) E st. 1911

PIAGGIO FW P 149 D P f e e M V s . « the brand-new design B O T A l- LONGER l a s t i n g of a genuine super scale 3-channel R/C model GIVES 3 TIMES MORE fo r either r. o. g. or COVERAGE handlaunched starts. Use l / 6 d Span 4 4 "— For. 15 cu. in.displ. Super PIi and engines with speed control. Indent No. 4613 Add Distinction to Your Craft. F ill Pit Range of BIrilliant ^ TOPSY Colours and Clear, Obtainable from your local Model/Handicraft Shop. The smallest German Trade Enquiries STEVENSON AEROSOLS LIMITED Invited. free-flight and R/C model, CLUB GARDENS WALK. SHEFFIELD II span 32". Lively performer on single or 3-channel R/C gear-fully aerobatic- designed to take engines ALL ORDERS OVER £2 P O S T FREE FROM from .02 — .049 cu.in.displ. Indent No. 4611 MODEL AIRCRAFT SUPPLIES LTD.

Please ask your favourite dealer for MERCO 29 or 35 £6/1/6 VECO .19 R/C a / 19/6 details of these and other model aircraft £2/14/2 and ship novelties and of those superb MERCO 29 or 35 R/C £7/15/0 FROG 150 R radio control sets. COX OLYMPIC (2.5) £5/19/6 P.A .W . 1.49 £4/7/4 The GRAUPNER novelty prospectus FSP/FSN SUPER TIGRE .51 R/C £9/1/0 AM 15 R/C £3/11/10 is yours for the asking, FREE.

29 OLD KENT ROAD, LONDON, S.E.1 Agents: Te/: Learn more 6d. in Stamps for Lists HO P 3482 A. A. Hales a b o u t my 26 Station Close complete model Potters Bar, Middlesex building pro­ Polk's Model Craft Hobbies, Inc. gram from the 314 Fifth Ave. New vork 1, N. Y. G R A U P N E R Phossro Ltd. PROGRESS OFFERS YOU UP-TO-THE-MINUTE ENGINES 15 FS cata logue , 45 Wingold Ave. OF QUALITY AND PERFORMANCE DESIGNED BY printed in four Toronto 19, Ont. lang uag es Paul Grosmonn Pty. Ltd. GIG EIFFLAENDER (engl., fr., sp., 16 A Tin tern Road .176 B.H.P. at 17.000 R.P.M. 3J ox. it.) available Ashfidd, N.S.W. Phil de Bruyn PAW 1.49 For Sport. T/R, F/F, Stunt 87/4 from my agents. 4 Pritchard Centre inc. PITax 85 Pritchard Street Johannesburg .32 B.H.P. st 15.500 R.P.M. Special New Zealand: Burton Brailsford Agencies PAW 2.49 For Sport, T/R, F/F, Stunt 5J ox. 99/6 261 Willis Street Inc. P/Tax prospectus Wellington, C. 2. free of British G uiana: Petambor Dindayal Combat Special (3.2 c.c.) .38 charge 104 Regent Street g ] 4 PAW I9-D B.H.P. it 15,000 R.P.M. Especially Georgetown developed for Combat. A must for every Combat Circle. 5f ox. 106/1 Inc. PITax JOHANNES GRAUPNER · KIRCHHEIM-TECK · GERMANY Manufacturers λ Distributors: All items are available through recognized dealers only PROGRESS AERO WORKS, CHESTER RD., MACCLESFIELD, CHES.

Kindly mention AERO MO D ELLER when replying to advertisers THE NAME THAT MEANS PERFORMANCE TO MODELLERS Drome THE WORLD OVER S iPresenting the F IR S T model racer with miniaturized >) BIG CAR ENGINEERING Super detailed

Scaled from actual works blueprints of the of five out of six Grand Prix events.

Nothing ever like it before— the fabulous model race car that EVERYONE will want . . . ANY- ONE can operate . . . LOADED with exclusive features. No question of worrying the neigh­ bours. either. Its adjustable silencer can be set fot quiet running or opened up for full-throttle roar and power, at amazing speeds.

Length 13} in. Wheelbase 7} in PLUS A COMPLETE RANGE OF READY-TO-FLY C/L MODELS It's the thrill of a lifetime to own and fly on e o f these C ox-pow ered "crashproof" all plastic scale control line models. BACKED BY A COMPLETE SPARES SERVICE. SUPER SABRE (Pee Wee) £4'8/5 LI'L STINKER (Pee W ee) £ 5 '7 /ll P-40 WARHAWK (Super Bee) £6/10/1 COMANCHE (Sportsm an .15) £16 13/11 24 in span CURTISS PUSHER (Babe Bee) CURTISS PUSHER kit £5/17/8

ENDURANCE TESTED FOR 500 MILES!

6L0-M0T0RS cu. in. COX F H W g 020 39/2 Positively the world's .049 39/2 finest examples of preci­ I in. span SUPER SABRE sion miniature engineer­ .049 68/- ing. manufactured to SPACE millionths of an inch .049 accuracy in piston OLYMPIC .15 ilui* fit! Take your choice from the original c.c. Cox Thimble- T-D .010 .16 78/10 Drome range (new and im­ T-D .020 .33 «/- proved for 1962) COX GLOW FUEL or the all-new T-D .049 .82 78/10 The best for all glow Tec-Dee Contest EACH MODEL motors. 15 per cent, Line. T-D .15 2.45 124/ COMPLETE WITH nitro. Per can 4/6 10 in. span LI'L STINKER I C/L HANDLE, ETC. T h im b le A.A.H ALES LTD. -D ro m e 26 STATION CLOSE, POTTERS BAR, MX.

Made and printed in Great Britain by the Croydon Times Ltd.. 104 High Street. Croydon, for the Proprietors. The Model Aeronautical Press Ltd.. 38 Clarendon Road. Watford. Herts. Published by the Argus Press Ltd.. K-IO lemplc Avenue. London. E.C.4. to whom all trade enquiries should be addressed. Registered at the G P O. for transmission by Canadian Magazine Post. *S of each” from our Huge Range

SUITABLE ENGINES lor the Phantom Mite t.D . BAW . ... 571! Britain's t.O. PtP ...... 431 most popular O.C. DART . ..64 Control Line D.C. WERUN . 4S Trainer! D.C. RANT AW . Ύ CORRA .· 3 A-S SS

PHANTOM

The Phantom Mite is just about the toughest model available to the newcomer to control line fly>n2* Features all sheet construction with wings, tail- plane, fin and fuselage sides ready cut to shape. 15/6 For .5 to .8 c.c. m otors. W ingspan I6in. I t / / V

CONQUEST Towline glider fo r rh« «

M Wingspan 8/9 GAUCHO Outstanding contest model of the pylon type for I to 1.5 c.c. engines. High quality materials and die-cut parts

SUITABLE ENGINES E.D. HORNET ... 57/5 D.C. SABRE E.D. Super FURY 79/6 A.M. 10 ... P.A.W. 1.49 ... 86/- A.M. 15 ...

COMPETITOR THERE ARE OVER 100 MODELS Rubber powered free flight IN THE KEILKRAFT RANGE duration model. An out­ standing performer of 32" wingspan. 10/6 ALL EXPERTLY DESIGNED FOR SUPER PERFORMANCE

The above prices include Purchase Tax but not special tax surcharge 7U& Grveatiut N&m * in \nodoi kifo Buy KEILKRAFT at your local model shop