lM— r e l l e d o M PCA! lthr Defender Fletcher SPECIAL! O INCORPORATING NOW E F L IE L S! N PLA SIZE LL FU EE R H T M O D EAI L R C R A F T prsRbe oe plans model Rubber Sports 1 1 1 1 | j H H v- . v- - an | . x l map m m A CANADA 5 CNTS CEN 50 A D A N A C & SA U ^ ^ hobby TWO SHILLINGS & SIXPENCE SIXPENCE & SHILLINGS TWO

UE 1966 JUNE magazine SABRE 1.5 cc. 75/-

BANTAKI .75 c.c. 45/.

QUICKSTART

MODEL THE GREATEST DIESEL handbook RANGE OF HANDBOOK SPORTS FLYERS

Free with every Quickstart diesel this In­ valuable handbook covers the handling, care ENGINES and maintenance of model diesels. Prepared by experts, it is well illustrated and an Invaluable aid to trouble free operation. Send 1 /3d. ( P.O. or stamps) for your copy CALL IN AT YOUR MODEL SHOP TODAY — todayl in case of difficulty write direct to QUICKSTART DAVIES-CHARLTON LTD

ACCESSORIES HILLS MEADOW. DOUGLAS, ISLE OF MAN CONTROL LINE HANDLE ENGINE TEST STAND NYLON PROPELLERS Marine Engines FULL RANGE OF SPARES DART, MERLIN. SPITFIRE, SABRE, OUICKSLIP CONNECTOR ALSO AVAILABLE AS A MARINE QUICKSTART GLOWPLUGS ENGINE COMPLETE WITH FLY­ E.G. 98 E.G. 99 WHEEL AND WATER COOLED E.G. 200 HEAD

=* SPITFIRE PIMFRI E li L IIN U § e o u f 1.0 cc ί® 5ΗΓ -75 cc ι β ι ** SUPER Editorial Director D. J. LAIDL AW-DICKSOM EDITOR R.G. MOULTON Assistant Editor J. FRANKLIN Modeller Advertisement Manager LIONEL HARRIS NOW INCORPORATING MODEL AIRCRAFT

Ju n e 1966 VOLUME XXXI No 365 COMMENT CONTENTS It takes a day like the brilliant first of May to inspire aeromodellers to greater HEARD AT THE HANGAR DOORS 312 hopes for the Summer flying season. Bright sunshine, fresh green grass, light STRICTLY SIMPLE 314 breezes and a crash free flying session BASIC AEROMODELLING—rubber motors 316 are the ingredients for happiness in any aeromodeller and most of us found that FLETCHER DEFENDER 318 on May day. All fingers are crossed in the GOLDEN WINGS CLUB 318 expectation that the Month w ill go out as it came in. What could be better for GOLDEN WINGS QUIZ 319 our 1966 British National Championships FREE FLIGHT COMMENT—J. O'Donnell 323 at Whitsun? The map on page 313 gives locations of the various events at R.A.F. ENGINE TEST—Enya .093 325 Hullavington—See YOU there? AIRCRAFT DESCRIBED—Farman Shorthorn 327 Success of the Easter meeting and a calendar of rallies that is fuller than ever CUE-DOT—A/l Glider 334 before, give promise of a great modelling LATEST ENGINE NEWS—P. Chinn 336 season, the climax of which must surely be in the W orld Championships for SCALE COMMENT—J. D. McHard 337 Control line models at the end of August. MONOKOTE COVERING 340 Plans for this event at R A F. Swinderby are well-laid with the spectator getting TOPICAL TWISTS 342 as much consideration as the competitor. SILENCERS & NOISE— Part 1 343 This all important aspect must never be forgotten. For every single contestant EASTER EVENTS 346 there are at least twenty sports- CLUB AND CONTEST NEWS 349 enthusiasts looking on. It is their support that makes possible a strong National organisation, able to look after the demands of the cup-chasers. Those who AN MAP^ HOBBY MAGAZINE go to watch, or maybe fly for fun on the side of the ’drome, return to local fields inspired to do better and carry the spirit of aeromodelling into the corners of also MODEL BOATS . MODEL CARS . RADIO every county in the land. CONTROL MODELS A ELECTRONICS . MODEL ENGINEER and MODEL R AILW AY NEWS. cover

This periodical Scale enthusiasts who waxed eulogies on G. Duval’s drawing of the P.47 Thunderbolt have a treat in store, for next month we feature the MODEL AERONAUTICAL PRESS LTD. Hawker Typhoon in the series. Nordic Champs. Australian and South African Nats, a free-flight 13-35 Bridge Street, Hemel Hempstead, Herts delta Opus by P. Champion, full-size plans as usual and the regular features on Latest Engines, Tel.: Hem el Hempstead 2501 (Mon.-Fri.) w ill make this another big edition out on June 17th. Holiday offer from Bostik! SAVE £1.10.0 on this expanding suitcase This is your chance to buy a superbly designed You need Rostik round the house, in the car and on HOLIDAYS. suitcase for your holidays at a superbly low price! Here’s a list of the different Bostiks: lostik t. A clear, clean, general-purpose adhesive. 1/11. lostik 2. For heavy outside sticking jobs. 2/9 and 316. Holds far more. You will be amazed at how much you can lostik 3. Suitable for sticking plastics and “ Formica” . 2/9, 4/3 and 8/-. lostik 4. Made to tix every sort of glazed tile. 3/6 and 7/6. pack into this blue, specially designed 25-inch Revelation lostik 5. White scaling strip, quick and clean to use. In packs 2/6. suitcase. It has rustless, expanding lock fittings and a new lostik 6. Outdoor sealing compound for gaps around the house and on shape to take far more than old-fashioned suitcases. he car. 3/6. lostik 7. A new super-strength adhesive which docs your “ impossible” ticking jobs. 5/6. (A il prices are maximum retail.) Saves you £1.10.0. The suitcase— which will last a life­ time— is worth £5.5.0. But you can get it for 75/-if you — — - CUT OUT THIS ORDER FORM send us two Bostik cartons. One of these must be a Bostik Please send me your expanding suitcase. I enclose a No. 1 carton. The second must be a carton or pack from chequc/P.O. (made payable to Bostik Suitcase Offer) for £3.15.0 and two Bostik cartons. b l o c k c a p i t a l s p l e a s e any other Bostik.

How to get your suitcase. Send the order form on right to: Bostik Ltd., Ulvcrscroft Road, Leicester. Offer only Tfit word' Bostik' is a trademir* registered in the United Kingdom open while stocks last. Get in quick! and m in/other countries. AGI 305 June, 1966

The magnificent V.C.10. This authentic 1/144 scale model, of the powerful jet liner now in use with the leading air lines, is made from a superbly detailed 74 part kit costing 6/-. It's one of many exciting kits by Airfix. There are over 200 of them, covering 13 different series. And at 2/- to 17/6 you can well afford to make all your models just like the real thing.

STOP PRESS S' WESTLAND SCOUT Fully detailed 1/72 scale model. The "Scout" is used by the British Army in Europe and Security Forces in the Middle East for reconnaissance, freight transport, carrying weapons, and air/sea rescue. Maximum speed AIRFIX §ΜίίΛΝΤ IIS knots. 46-part Kit only 2 /-. Also Freedom Fighter 47-part Kit only 2 /-. CONSTRUCTION KITS U c fS f' !ik .e > ■the. naai -thing!

From model and hobby shops, toy shops and F. W. Woolworth

A 365 Selecting top quality Balsa sheet is easy. Every piece of Solarbo sheet (and block) bears the Solarbo stamp which is your automatic guarantee of quality. We can’t stamp strip, of course, but the quality is there just the same. Just to be sure of top quality and ‘matched’ strip, though, many experts prefer to cut their own strip from selected sheet. For matched longerons you must mark the ends of the sheet before cutting, and it is a good idea to cut an extra length for testing. It’s a bit tricky cutting accurate strip by hand, though, and you need to check each piece.

madk iso or meet s m .r o r s l a y srrm see acttutcuLAPur** UMOTrtS-Ott tout i&Mar srr/r to rn sfcovo srnr> /j v w a a p o )’ THt WAr ROUNO. /S B A O C r co r « o t c a c s a u c s z k h t .

It’s far easier to work with strip bought in the size you intend to use— but not always so easy to match individual strips for strength, stiffness and weight. The best way is to buy more lengths than you need (they w ill always be useful later) and carry out a detailed selection later. The four steps in carrying out these tests are shown below.

1. If a bundle of strip lengths is supported over the edge of a table you can easily separate the 'stiff' from the ‘flexible' strip by the amounts they bend at the end. 2. If a bundle of strips are dropped (not tangled up together!) the heaviest strips will reach the floor first. 3. Grasp four to six strips firmly and ‘whip' up and down gently. Matched strips will whip the same amount. 4. Following 1. 2 and 3 should give you a number of matched strips. Now check them individually for weight. 5. Finally, a quality check. Actually you should start with this by asking for Solarbo strip by name. You w ill then end up at step 4 with matched strips and quality automatically assured!

SOLARBO LTD., COMMERCE WAY, LANCING, SUSSEX •/its Totnu Withr m t Λ W^eWBi ΛΕΛλιλλ nzivrzn ϋί Ά Κ iL· g'S' IF®®®

“HARLEYFORDACIOUS” Meaning: The VALUE of a book is many limes its PRICE IMAGINE a source of supply of 1 /72nd scale, 3-view drawings (with * fuselage and wing sections) and that these were available for only half- a-crown each! Take two dozen of these and add a detailed history o f the aircraft they depict, a story of their use in the 1939-1945 war, another of their development and, fo r good measure, an analysis o f their many variants. Add to these, twelve FULL-COLOUR illustrations representing vun is a hauls rruao rushicA’rsoa the aircraft in various camouflage schemes and showing pilot and unit markings, and finally 360 first-class aircraft photographs at a mere 2d. each! In fact, you will he making up a total of 212 pages with the stories of Heinrich Fockc. Georg Wult and Kurt Lank and the development of their series of brilliant fighter aircraft. Add official Luftwaffe ngnter battle orders’* and details of the many projected variations of the aircraft, including information ot tnc experimental designs such as the “ Mistel” , the “Glide-bomb” and the “ Doppleriter” . and you will be arriving at VA LU E. Value? Well, take twenty-four half-a-crown. l/72nd scale drawings and 360 tuppenny photographs and you get 120/-. Full-colour illustrations at. say, a paltry two shillings each, and there's another 24/-. Ihcn there are the war service story and the early histories: tens o f thousands o f words which, at today’s book prices, should be priced at 40/-! Value? 184/-! Oh! There are also about fifty line drawings in the book as well. Perspectives showing armament installations, elevations showing engine installations, as well as detail sketches amplifying sections o f the text. Let’s be conservative and say 16/- fo r these. Value? 200,'-. Well, 'FUAT’S “Harleyfordacious", for “ THE FOCKE-WULF 190 A FAMOUS GERMAN FIGHTER” by HEINZ J. NOWARRA HARLEYFORD PUBLICATIONS LTD fosts only 60/-(ΙΙΛ., $10.00). WRITE l>EPT. A!VIJ (A N D we pay the postage, the packing and the insurance) LETCHWORTH HERTS ENGLAND HENRY HINODE SAYS— ^ 5 0 AMAZING RELEASE! Get started into Radio Control NOW ! with this new HINODE offer.

HINODE 2A-5T 5 TRANSISTOR TRANSMITTER HINODE R-250 RECEIVER HINODE MS-50 SERVO ALL FOR ONLY: £A3 1.0.0 or AS62.0.0 NORMAL PRICE: LA4I.I2.6 (AS83.25) saving EA10.1.6 (AS20.15) JUST ARRIVED: HINODE ES-I MOTOR CONTROL SERVO UNIT £A6.3.6 each, with alloy mounting board and many other excellent features TRADE ENQUIRIES INVITED: NEW PRICE LIST now available. 2/0 (.20c) per copy FROM

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216-218 SWANSTON STREET MELBOURNE AUSTRALIA MODEL DOCKYARD MAIL ORDER o r PERSONAL SERVICE Available for immediate delivery ENGINES O.S. MINITRON 10 CHANNEL Cox Baby-Bee 049 42/0 SIMULTANEOUS SUPERHET from stock—the fabulous new D.C. Spitfire I cc. Diesel 70/9 Cash Price £95.10.0 D.C. Sabre 1.5 cc. Diesel 75/0 Deposit £9.10.0 D.C. Bantam 75 cc. Glow 4S/0 Balance 99 weeks at 23/0 D.C. Merlin 76 cc. Diesel S9/5 P.A.W. 1.49 cc. Diesel 86/0 CITIZENSHIP PROPORTIONAL MERC0 61 and 49 MK. II P.A.W. 2.49 cc. Diesel 91/0 Cash Price £125.0.0 P.A.W. .19 cc. Diesel 104/6 Deposit £12.0.0 O.S. Pet .09 cc. Glow 53/2 Balance 97 weeks at 31/0 O.S. Pet R/C .09 cc. Glow 63/9 AERIAL 6 CHANNEL TX A RX Here is the ultimate in R/C O.S. 19 Glow 124/0 SIMULTANEOUS SUPERHET power units. A development of the O.S. 19 W /C Glow 189/0 Cash Price £39.10.6 already world-renowned Merco that O.S. IS Glow 118/1 Deposit £3.10.6 O.S. 15 R/C Glow 151/2 Balance 96 weeks at 10/0 won the R/C World Championship O.S. 6 Glow 115/9 O.S. PIXIE SINGLE RX A TX last year. Now fitted with the Fro? 249 Diesel 97/6 NEW TWIN PLUG HEAD and Frog 349 W /C R/C 157/6 Cash Price £16.15.0 McCoy 35 R/C Glow 109/6 Deposit £1.15.0 bronze bushes in the big end. & MANY MORE Balance 47 weeks at 8/0 little end. and piston bearings, RAVEN 6 CHANNEL TX A RX as well as bronze end pads in the R/C KITS SIMULTANEOUS SUPERHET gudgeon pin. A ll bronze Frog jackdaw £5.18.9 Cash Price £66.15.0 bearings arc honed for K.K. Super 60 £6. 0.0 Deposit £6.15.0 K.K. Mini Super £4.18.0 Balance 97 weeks at 16/0 absolute accuracy of fit. K.K. Gyron £3. 9.fi The result of these Veron Concord £11.15.6 We w ill build you any models modifications is:— Veron Cessna £5.12.6 from kits, or plans on credit Top-Flite Schoolmaster £3.12.6 terms. Send for quotation. MORE POWER — GREATER FLEXIBILITY C /L KITS LONGER WORKING LIFE — BETTER SLOW RUNNING Top-Flite Nobler £5.19.6 All engines, kits, accessories K.K. Spectre £2.5 10 totalling over £5 are now and the price is a very moderate £13 17 6 for the 61 Mercury Monarch £1.19.6 available over 20 weeks with £12 IS 9 for the 49 Mercury Crusader £3.13.1 10 per cent deposit. We have these units available for immediate delivery either over- the-counter or from our Mail Order Department. Please add 2/6 to cover registered post. Or can be sent C.O.D., you pay the postman SIDNEY ROSS & Co Ltd BUY A MERCO MK. II AND GET TOMORROWS ENGINE TODAY HENRY j. NICHOLLS A SON LTD., 9-13 PO W IS ST., W O O L W IC H , L O N D O N S.E. 18 the modem model shop, Tel. WOO 2820 308 Holloway Rd.. London N.7. Tel: NORth 4272

ETA ENGINES ARE THE BEST We apologise for delays but orders are heaviest ever ALREADY OUR LIST OF WINS FOR I960 and. owing to the fact that our secrets are only trusted IS IMPRESSIVE to a chosen few. our output is limited. We are. how­ ETA 15. 1st, 2nd. 3rd: FAI Team Race. Tern Hill. Place/ Howarth. ever. working as hard as possible to deliver your motor. ETA 15. 1st: 1.000 Lap Race. Milan, Italy. Lugli/Marasini ETA 15 1st. 2nd. 3rd: FAI Team Race. South Island Champs. New Zealand. A. Wooding. ETA 15. Breaks Canadian FAI Team Race Record for 100 and 200 laps. Patton/Eastwood ETA 29. 1st Rat Race—German Command Champs. CpI. Millar. ETA 29. 1st: German Control Line Champs. CpI Millar Speed. and many more.

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Eta Instruments Ltd. 289 High St, Watford #

PLANES

CONTROL LINE FLYING Spitfire Action-packed. Ready-to-fly Scale Models. Complete with engine, propeller, control, handle and control lines. All planes come complete with the world famous fuel powered COX engines, each model a masterpiece of preci­ sion miniature engineering. For breathtaking thrills of con­ trol line flying, select the model of your choice from the World's FINEST RANGE! SPITFIRE £7 10 0 Trim, fast and manoeuvrable. Scale details include cockpit interior, underwing radiator and oil cooler, wing-mounted cannon, etc. Wingspan 23". FLEDGLING £4 12 6 Highly manoeuvrable low wing Trainer plane with tri­ cycle undercarriage, interior cockpit details, clear plastic canopy. Wingspan 16". SB2C Helldiver STUKA DIVE-BOMBER £7 10 0 Stuka Dive-Bomber 231" wingspan action-packed scale model which drops bombs in flight . . . canopy opens . . . machine gun swivels . . . visible fuel gauge. Curtiss Bomber CURTISS BOMBER £6 19 6 Scale detail includes underwing rockets, landing gear doors, auxiliary tanks, authentic canopy— plus the working feature of bomb dropping in flight. Wingspan 20". PT-19 FLIGHT TRAINER £5 19 6 Large 22" wingspan with built-in ‘crashproof features for control line pilot training. Adjustable flight sensi­ tivity for beginners up to advanced manoeuvres. SB2C HELL DIVER £6 19 6 Special working features include working ejector seat with parachute descent by prlot. retractable deck- landing hook for Carrier landings, etc. Wing span 20". Other terrific planes (Not illustrated) SUPER CUB 17J" wingspan ...... £3 19 6 PT-19 Flight Trainer SPOTTER PLANE 171" wingspan ...... £3 19 6 TOMAHAWK 20" wingspan ...... £4 19 6 : BENDIX TROPHY RACER 16" wingspan...... £5 19 0 1 P51 MUSTANG 16 wingspan ...... £6 12 0 Fledgling ★ Pop along to your favourite Hobby. Model or Toy shop and see the whole wonderful range of Cox aircraft or send stamped, addressed envelope for your FREE copy of the Cox leaflet to:— A. A. HALES LTD., (Dept. F), 26 STATION CLOSE, POTTERS BAR, HERTS. TEL: Potters Bar 52226 A Member of the Lines Croup J P A W ENGINES P.A.W. 19-BR. Giant shaft, terrific power output. Super NEW FORMULA high-speed 10 ball race. PLASTIC ENAMEL Extra large bearing surfaces. Mounting interchangeable with 2.49 and 19. The 18 beautiful contemporary colours, including black EXHAUST MUFFLERS. Designed to reduce direct ex­ and white, can be intermixed haust noise whilst caking minimum of power. Sold to provide a wide range of with fitting instructions. colours. Joy Plastic Enamel has good flow, and is resistant THE P.A.W. RANGE OF ENGINES: to heal and most fuels. P.A.W. 1.49 £4 6 0 Gives glass-hard abrasion P.A.W. 2.49 Mk. Ill £4 18 0 and wear resisting surface. P.A.W. 19-D Mk. II £5 4 6 A ll colours are lead free and P.A.W. 19-BR £6 6 0 arc safe to be used on Exhaust Muffler for 2.49 or 19 13 9 children's toys, etc. Exhaust Muffler for 1 49 12 6 Tins 1/2; 2/-; 3/3; 5/6. Also available in a special pack All prices include Purchase Tax. Obtainable containing 6 bottles and from Model Shops. In case of difficulty write to: brush. 3/6 complete. Is the registered trade mark of PROGRESS AERO WORKS TURNBRIDGES LTD., LONDON, S.W.17, ENGLAND CHESTER ROAD. MACCLESFIELD

The Model Shop The Model Mecca (MANCHESTER) of the North

Sky-l.cader 34 1 Proportional, I he “ MacGregor” (M k. 2) range SELECTED KITS including 3 Bonner Radio Control Kits are extremely Inchworm A /2 Glider 23/10 Cox Pec-Wee 02«* 42 '6 Servos £122/17/6 rcliahle and easy to construct: Top-Flite Taurus Multi £16/10 0 Cox Babe-Bee 049 42/6 Dcac Packs fo r Transmitter and Full alter sales service operated. Top Flite Schoolgirl R C £3/15 0 Wcn-M... Hot Shot 049 59/11 Receiver Set €10 F D 2 49 Racer, complete with Available as follows: Top FHte S’lmastcr R /C £3/12/6 ORDF.R NOW FOR Veron Robot R/C Trainer £4/9,6 fitted Silencer 92/6 SWIFT DELIVERY Carrier Wave Receiver K it £3 10 0 Vrron Mini-Robot R C £2/9,6 P AAV I 49 Diesel £4 6/0 Carrier Transmitter Kit £2/19 6 Mercury Crusader C/L £3/13/1 P A W. 2 49 Diesel £4/18/0 Γ-mc Transmitter K it £4/5/0 Mercury Toreador C/L £1/7/7 P A W. . J9 (3.5 cc.) Diesel £5/4/6 Fiitaba F.T 3A Transmitter £8/2'6 Tcrrytone Receiver Κ>· £5 19 6 Top Flite Nobler C l £5/1° 6 P A W .19 B R £6/6/0 lutaba F4-1 R Rclayless Rx Case and Ariel for both K /K Snipe 40 in. F /F 24/3 DC Dart 5 cc £3/15/0 *7/17-0 Transmitters £2,15/0 K/K Gaucho 44 in. F/F 26/9 DC. Merlin 76 cc £2/19/5 Futaba F3-TR Relay Rx £8/2/6 All ••Elmic” escapements are pre­ K.K Gyron R/C £3/9/8 D C. Standard Bantam .049 45/0 K/K Caprice 50 in. 19/11 E T A I5D (1 lire) £7/8/6 Fntaba Escapement ML-2 £1/19/9 cision made and super reliable with any single channel unit K K M ini Spr. 48 in. R C £4 18 0 Cox Tee-Dee 049 £5/7/6 Futaba FT-5C Tx and Matching rim ic Conquest Escapement 35,0 K /K Super 60 in. R /C £5/19/6 M E Heron I cc £3/0'6 •Supcrhct F6-STR Relay Rx l.hnic Commander 59/2 K /K Spectre Stunt C ll. £2/6/11 M .E. Snipe I 5 cc 64/0 £28/5/0 K/K Firebird C'mbat C/L £1/10/6 Frog I50R 65/0 Elmic Compact 67/4 K K Gyron 36" R /C 69.8 Futaba (-channel Servo £3/15/6 Elmic Corporal 47/2 Frog 80 M k. 2 54/0 As above Transistorised £6/5/6 NEW! Frog 100 Mk 2 59/6 Merco 61 R/C Twin Plug £13/17/6 New' Ariel Six channel Tx CLIMAX” SERVOS FROM STOCK Veron Mini-Concord R /C 79/11 O S 40 R C Glow £8/16/3 & Supcrhct Rx £39/10 0 40" fo r up to 1 cc. engines O S. 58 R C Glow £13/17/6 Fantastic'' O S Pixie ''U n im ite " Single Channel £3/10/0 OENERAL ACCESSORIES Merco 29 or .35 Stunt £5'!9/6 Single Channel Tx and ■'Servomite" Multi £2/18/9 A M .15 Diesel £3/14/8 Relay Rx £16/15/0 “ Musclemite” Standard £4/10/0 Cox Handyreel 35 0 A M 25 Diesel £3/19/9 O S. Pixie Relay Receiver ■‘Musclemite" Kit from £2/18/9 Merco 29 or 35 Silencer* 26 1 onlv £6/13/6 As above Transistorised £5/18/2 Merco .49 or .61 Silencers 26 7 “ Unipack" tor Rudder and engine Gee Dee Pike Silencers 62 6 Lt.W t. only 6 /- sq yd. plus post Latest F & M Mldas/Matador 10 control with single ch. £11/11;0 Tornado 8 x 6 in or 8 x 8 in ea 5/9 OUR EXCLUSIVE NYLON Superhet £87/10/0 ■■Nucleonic'' Universal Dcac Tornado 7 x 8 Nylon, each 3'9 Red, Blue. Black. Lemon. White. NEW! O S. Minitron 6 ch. S'hct Charger Charges 2.4 to 12 Accurate Vibro-Tachometcr 32/6 Apricot. Powder Blue. Turquoiae Rx & Transistor Tx £59/19/6 volts. 150 to 500 DK2 Cells 45/0 Small Universal M ulti Meter 49/6 SEND NOW TO OUR O N LY ADDRESS Mail Orders Post Free over £3 U.K, only Tel.: BLACKFR IARS n BOOTLE STREET, off Dcansgatc. MANCHESTER 2 39Π MULTI MULTI MULTI MULTI

Multi channel control is probably what most radio control enthusiasts seek, eventually, to achieve. Multi C h a n n e l But all too often, introduction to this more advan­ ced stage of the radio control hobby is fraught with problems brought about by sheer lack of know­ Radio ledge of the subject. It is for this reason, to help the beginner over his problems, that MULTI CHANNEL RADIO CONTROL has been introduced. Control OUT Here the beginner will find explained in simple terms the working of multi channel equipment which so often is a mental barrier and can itself lead to dismal failure. JUNE Today, people are regularly entering the radio control hobby without previous modelling ex­ perience. Some years ago, these newcomers would have begun their radio control career with 10th single channel equipment, but today it is not at all uncommon for a newcomer to begin radio control RESERVE activities with multi channel equipment. For these people especially, there are no short cuts to multi YOUR channel success, and for these, or any beginner, MULTI CHANNEL RADIO CONTROL is an COPY indispensable reference work. This publication has a bright, full colour photo dust cover, cloth covered boards and gold blocked NOW title on spine. There are 112 pages size 8^· x 5* ins., printed on high quality gloss paper with numerous line and photo illustrations. Available from booksellers, newsagents, model shops or direct from the publishers from June 10th Price 12/6 | notT org e7t in G | SINGLE SINGLE SINGLE HERE’S WHAT IT CONTAINS SINGLE CHANNEL RADIO C O N T R O L . R. H. W arring. • MULTI CHANNEL SYSTEMS · AIRCRAFT SYSTEMS I e h » # ™ / D,cao7er°Vo I figures, sundry tables, 85 I pages. 40 p h o to illu s - j • MULTI TRANSMITTERS · AIRCRAFT INSTALLATIONS trations. A simple introduction to • MULTI RECEIVERS · BOAT SYSTEMS radio control of both aircraft and boats, covering receivers, | transmitters, actuators, • MULTI SERVOS · OPERATION OF^MULTI EQUIPMENT escapemonts, servos, air- I craft types and engines, |[ aircraft systems, boat and • MULTI PROPORTIONAL · F.A.I. AEROBATIC SCHEDULE vehicle systems, installation | operation, faults and trouble | • COMMERCIAL EQUIPMENT · CIRCUITS · CONTROLS shooting. Twelve appendi­ ces. Best value ever offered £ on this subject

ORDER NOW on this I enclose...... for my copies of: handy coupon... and post Q Multi Channel Radio Control | Single Channel R/C □ I tOrModel Aeronautical Press Name...... limited. 13/35 Bridge Street, Address...... ^ Hemel Hempstead, Herts. or hand to your Model Shop POSTAGE up to and including 12/6 add 1 /- Above 12/6 Free Aero Modeller 312 Heard at the H A N G A R DOORS Prague (Czechoslovakia) control-line circuit was used for the first European International at Easter, attracting five nations. It has been in use for several ears but is now destined for bi-section by a railway line to come parallel to that in the background. (See photos, page 346V THAT SILENCER CONTRO­ control line and radio classes. C.47 Dakota. Yet, oddly enough, VERSY. At the S.M.A.E. Council Official competitors will have a at the suggestion o f those most Meeting, April 23rd, it was re­ complete hangar set aside fo r use likely to know in the Vietnam solved that for the 1966 trials to as a sheltered p it area with direct conflict, some 26 C47’s have now select international teams, models access to the contest circles and been modified as AC47s. Side­ may be operated without silencers only a few moments walk from the ways mounted rapid firing guns and for a period o f 4 months accommodation, dining hall and can pour out thousands o f rounds prior to the trials, bonufide en­ social centre. a minute as the old transport trants w ill be permitted to practice Visitors will be able to see a rumbles round in a tight circuit. at sites established by and super­ static display of models in another So much for the purpose o f the vised by their S.M.A.E. Area Offi­ hangar including the World’s craft. cials. A fter the trials, only team largest collection of plastic scale We have been lucky enough to members may fly without silencers models constructed by Peter Farrar obtain an illustration of one taken and then only at recommended and club displays as well as manu­ by Harold G. Martin and it is re­ sites. facturers stands and demonstration produced on this page to show booths. modellers the general colour WORLD C/L C HAMPS NEWS. Refreshments will be available scheme in two tone camouflage Advance information concerning for spectators, and those who w-ish green and a light tan. The thought the Championships at R.A.F. to camp in the area w ill have a of a Dakota rumbling round in a Swinderby, August, indicates a special site set aside in the city of tight circle leads one to immedi­ very fine response to invitations Lincoln with fu ll facilities. For the ately think of o u i Aeromodellcr sent to National Aero Clubs. overseas visitors this has particular Plans Service version (plan no. The Netherlands, Czechoslovakia, appeal as it affords an opportunity C /L 765. price 9/- inc. post), but U.S.A., U.S.S.R., Eire. Hungary to view this famous city which is we suggest pointing the guns out Israel, Denmark, Belgium, Canada a great tourist centre, thus com­ of the circle or else using dummy and France have already made bining a holiday with a wonderful ammunition so as not to kill the entries. modelling meeting. pilot! Field arrangements, co-ordinated Those who seek reserved ac­ National markings are not ob­ by the S.M.A.E., R.A.F.M.A.A. commodation arc advised to con­ vious in the picture, the only and the Royal Air Force promise tact the S.M.A.E. Accommodation identification being the small a comprehensive display of all Officer, Mrs. F. Shirt. 27, Alhorpc black lettering on the fin. USAF that’s best in the world of Aero- Grove, Dinnington. Nr. Sheffield, 0-48801 which our Air Britain modelling, such as has never been S. York. experts tell us is a very aged seen before in this country. It is military machine dating back to likely that there will be five circles PUFF THE MAGIC DRAGON. 1943. More details are included in almost continuous operation, The last aeroplane one might in the May edition of “A ir Britain allowing on-site practice for the have expected U> have been devel­ Digest”, a publication which we visitors and demonstrations for the oped as on offensive attack air­ can thoroughly recommend to all general public of various other craft is the old faithful Douglas air enthusiasts. (Photo at left.) R A D IO FREE F LIG H T ? A t the 1965 W'orld Free Flight Champion­ ships Sum Zurad demonstrated his single channel equipment in a specially designed Wakefield model. He did not fly it in the contest and made clear to us that the purpose o f the radio was to enable him to make practice flights in a confined area, thus bringing the model back fairly quickly.— and safely. 313 June, 1966

The German magazine H u g -r shire countryside enjoying a rest Modcll Technick carries an article w'hcn what should fall out of the in its March issue o f this year by sky but a Blue and White Open Ing. F. VV. W ullner on “ Tele Rubber model. Observing the re­ Rubber” which is an appropriate quest notice to wait one hour title lor the class. Taking advan­ before reporting the model to the tage o f the ultra lightweight police (in this case Pat would have Webra Picco Radio control out­ brought it back to our offices) the fit (available in Great Britain next disturbance to arrive came in through Veron agents), Ing. the shape o f Laurie Barr and Roy W ullner emphasizes the advan­ Wootton of Hayes searching for tages to be gained and talks of the latter’s model. It so happened longer flights using the radio, one that Pat had unw ittingly laid out of which was no less than 72 her meal in the landing area for minutes! the mammoth fly-off in Airtcch’s One is left to wonder hots much free flight Rally at Haddenham! more interest will have been in­ Just shows you can’t get away spired by the German publication from work even when on holiday. and whether we shall eventually Incidentally the model \/ar, A l *.ee the requirement for crystal Wisher’s. control Superhcts at the free flight SKYBOLT is the name *f one championships? of our two free plans this month, “COMING IN ON RUNWAY the well proved little stun! control­ 10” , might well have been the line model by the ubiquitous Chris official approach message had Jack Foss. We believe that a lot of our Allen’s Coupe d’Hiver model been younger modellers will find Skybolt equipped with radio transmission ideal for getting them into the when it came down to earth after swing of things in the way o f first being launched at Chobham Com­ loops and a spot o f inverted flying. o f Toronto to the effect that W ilf mon in the Contest on Easter It’s light enough to bounce from Aldcroft has been able to repro­ Monday. Two days later. Jack most “accidents" and with its small duce the full-scale method o f p r o ­ received a letter from the Chief power requirements, is useful for ducing a smoke trail. Wilf has Officer. Ministry of Aviation. a very wide range of small capa­ fitted a needle valve assembly to a National Air Traffic Control city sport engines, (photo, right.) stock O.S. muffler to permit drip Service at London A irport! Mr. SMOKE RINGS in the air feed o f a 50/50 mixture o f Rislan Kirk of the Ministry reported that for control-line and radio control Carb-out (whatever that may be!) model aircraft 18007 (we like the enthusiasts may well he another and SAE 10 oil. It produces smoke appropriate last digits) was found useful by-product of the silencer from an O.S.49. Thin machine o il just to the South of runway 10 rule. Reading the Canadian News­ w ill produce reasonable effect—as Right, which was the main take-off letter “The Airfoil” we discover a used for scale effect in Model runway at London Airport. The note by the editor Frank Anderson Railway lay-outs. model was undamaged. Sounds like the best “ Can I have my model back mister?” story o f the year. As Britishers well know’, the day after the model was found, the country was buried under snow—so Jack is a very lucky chap. And as if to emphasise the changes in our weather, just two weeks later we were bathed in glorious hot sun­ shine for the whole week-end. INTERRU PTED PICNIC during that spell of fine weather on May 1st, came when Pat Silver our Secretary was minding her own business in the quiet Buckingham-

BRITISH NATIONALS see YOU there? W h a t’s on

S .M A £. British Nition»I Championships R A F. H u lla v ln g - ton W ilts., on ASM between Malmesbury and Chippenham M ay ?9 Sunday E y e n ls . Open Rubber (Μ.Λ Trophy). Open Power (Shelley Trophy). R/C Multi (S.M.A.E. Trophy). R/C Scale Qualifying Flights. C/L Scale Qualifying Flights (Knohke Trophy). Team Race Class A (Oavies A), Combat (heats) C'L Speed Handicap, plus one unorthodo* event. May 30 Monday Events Open Gilder (Thurston Cup) Com­ bined R/G,iP (Womens Cup), R/C Mulli (S.M.A.E. T ro p h y ). R/C Scale Judging. C/L Scale Judging, Team Race Class jA (R.A.F.M.A A Trophy). Sfunt (Gold Trophy) Combat (Finals) Aero Modeller 314 STRICTLY 1 SIMPLE

David Boddington offers two kinds of boxed unit radio control sets for transfer from model-to-model

W ITH so few really suitable flying days per annum as wiring etc. and manfully reinstating the jumble into far as the weather is concerned it becomes all the another model but usually by the time this hits been more essential for the R/C modeller to organise himself achieved the weather has deteriorated or dusk has fallen. so that he is able to make the most o f his limited oppor­ The object o f the model based radio unit presented here is tunities. There are frustrations enough on the flying field to overcome these difficulties of transferring the radio (docs Joe Soap really have to spend an hour carrying out equipment without any additional expense or loss of field checks on his equipment that you know was U/S efficiency. two years ago; he refuses to buy some decent equipment The two sizes o f units described should cover the and fiddles away regularly every weekend in the hope o f majority o f models available, both plans and kits, with some miracle happening!) so make sure you arc ready to the exception o f the ultra small and possibly the switching go when conditions permit. Most modellers accumulate arrangement may present some limitations on low wing over a period o f time, two or three models suitable for designs. The whole essence o f making these units is in Single Channel R/C flying but not many o f them can standardisation and it is wise to study your existing afl'ord the luxury o f a separate complete radio installation models, future projects and equipment available to for each model. This situation often leads to another decide which particular unit suits your needs best and frustrating condition on the flying field when, due to whether any modifications are required. You may for minor damage to the airframe no more flying can be instance decide that you would prefer to have the slide undertaken because o f the problem o f transferring the switch mounted on the side o f the unit instead o f the radio equipment from one model to the other. I have bottom: but remember that this would entail a rather seen the occasional stalwart, with portable soldering iron large hole in the side o f the fuselage to operate the switch connected to the car battery; delving into the dark recesses as it would be impossible to have it projecting through the o f the fuselage unsoldering joints, fishing out a tangle o f side. Alternatively the lop o f the switch could be lapped to receive a 6 b.a. bolt, this being screwed through a slot Heading shows the Unit A with MacGregor Rx installed. A t bottom: another Unit A with Raven Rx Is fitted to a single in the fuselage side, to actuate the switch. Naturally there channel design. Central photo shows the U nit B box work. are many variations that can be made on this type o f unit, it is equally suitable for housing motorised servos and could also incorporate an engine escapcment/servo, etc..to suit your own requirements. Tests have been carried out on both units with a variety o f receivers, batteries and DEACs in models o f wing spans from 32in. to 54in. and have proved their practicability both in the workshop and on the flying field. The only item that has remained as a constant is the Elmic 'Conquest* escapement because o f its simple torque rod coupling arrangement (Modified as shown on the drawings for greater security) but alternative couplings could be used for other escapements or servos. The advantages found in using and constructing these units, other than the basic function, included:— (a) A more compact unit is possible taking up less space than with a conventional installation. (b) Wiring lengths are reduced to a minimum and can be neatly arranged and fixed to the box. (c) Soldered joints arc reduced to a minimum and are made in ideal conditions, i.e. on lhc^>cnch'\vith the equipment easily accessible. (d) No plugs or sockets to w'ire up, or to give trouble, (e) Ample strength and shock absorbing qualities when installed in the model. The weight penalty is 3 .7 /8 "* 2/22" VERTICAL SUPPORTS FO AM RUBBER FOAM RUBBER SHOCK ABSORBER (CONTACT AR M TURNED THRO' 90* J T 1/8" HARD BALSA ENDS- CEMENTED TO BASE)

2/22" R* BASE ELMIC CONQUEST 1/8" HARD BALSA ENDS

,/fl' VERTICAL SUPPORTS CONQUEST 2.1/2-

1/8" HARD BALSA BASE TRIANGULAR BALSA 1/8- SQ. “'SLIDE SWITCH NO TE: THIS END OF 3ASE SHOULD 3E POSITION OF CHARGING BALSA BASE |/8" SQ. VERTICAL EXTENDED IF DEACS ARE USED. SLIDE SWITCH / SUPPORTS I / I 6 - SIDE 2/22" VERTICAL SUPPORTS SPACED A C C O R D IN G TO BATTERY COMPLEMENT 3 .6 VOLT 225 PACK f .SLIDE SWITCH 1/8- VERTICAL SUPPORT 7 0 UNDERSIDE OF R, BASE I >· 3/32" VERTICAL ■ f SUPPORTS .7 /8 " POSITION OF Rx 1/16" - 3/32" DEPENDENT O N Rx WIDTH V2 SIZE 2 0 G WIRE HOOK very small compared with the normal installation Construction including mounting plates, foam packing, etc. Construction o f the units is straightforward and should (f) The reliability of complete units such as these is be self evident from the drawings but a few' additional greater due to the security o f all joints and com­ comments may prove useful. ponents. No strain is put on any o f the wiring or (1) Check the size o f receiver and all other components equipment when a unit is changed from one air­ to make sure that the overall dimensions o f the frame to another. boxes are sufficient. The only disadvantage so far encountered has been with (2) Use medium to hard grade balsa for all parts o f the models tending to be tail heavy, with the units arranged boxes and cut out the pieces accurately as any box as they are it is not possible to move the battery com­ that is built ‘out o f square* may be difficult to slide plement further forward to achieve the correct balance. in and out o f the model. This, however, only occurred to any degree on one model (3) When the box is constructed, with all holes cut and and was cured by changing to a heavier engine o f about drilled for escapement, switch etc. give two coats the same output. For most models, having the majority o f o f sanding sealer and lightly sand. load around the centre of gravity is advantageous. The (4) Wiring to Unit B is all taken from components to ideal arrangement to aim for is to have two similar the underside o f the box, wiring to Unit Λ is interchangeable units so that in the event o f a radio carried out inside the box before assembly o f the failure as opposed to a model failure the faulty unit can right hand side piece and receiver base. Secure the be removed and the spare one installed, all in a matter of w iring to the box with Evostik or a similar contact minutes. This may seem to some modellers an extrava­ adhesive. gant aim but on a long term basis, and in savings through (5) It is advisable when sticking a receiver with an open not crashing models due to flying with faulty equipment, printed circuit board to foam rubber to give ample it is sound economical sense not to mention all that time for the adhesive to dry before testing the unit extra flying you w ill enjoy. otherwise a short could occur.

jkucm c< moo:* «αϊτόν» io itViC COsOuEST TOMOVIM GREAT (I SCOMITV V i SIZE (6) A ll components secured to the box with nuts and bolts should have the balsa reinforced with 1 mm plyw ood at the position o f the hole. When lining the slide rails to the model make certain that these are parallel and at the correct spacings for the box; the twro outer rails can be glued with the unit in position and the inner rails fixed after the unit is removed agai:'..

GUI IN UbOtCVP: fCA SWIIC* access. Aero Modeller 316 BASIC Aeromodelling P A R T S IX Rubber Motors

T A B L E XX TYPICAL WEIGHT OF RUBBER STRIP (UNLUBRICATED) O U N C E S PER Shirley and Bill Horton of Crawley winding the rubber motor of LE N G T H PER Roger Schroeder's (U.S.A.) Coupe d ’Hiver model at Chavenay, SIZE* France. Note the use of d rill winder with trip odometer to in­ 1 2 yd s. 1 yd . HI. 1 lb w e ig h t (feet) dicate number o f turns. r p H L type o f rubber used for model aircraft is specially 1 x 24 2* 5/24 .0695 231 J formulated so as to have a consistent performance 1 x 30 2 1/6 .0556 288 and good ‘stretchability’ (an elongation o f about 800 per A x 24 U 5/32 .0520 306 cent). It is normally made in ‘strip’ or rectangular A x 30 n 1/8 .0418 384 sections, because experience has shown that this is more 1 x 24 U 5/48 .0347 462 * x 30 1 1/12 .0278 576 durable than ‘square’ sections. Standard British (and American) si/.es arc ± in., ^ in. and { in. wide in either * variable with different makes. 1 /24th or 1 /30th inch thick. Thicknesses are often i and ^ o f the total weight o f the model to get a good designated by number only, e.g. x 24 instead o f i in. x performance. That is, if the complete airframe, less 1 /24th. rubber motor, weighs 4 ounces the rubber motor weight Dimensions arc nominal. That is to say the actual needs to be between 1$ and 2 ounces depending to a dimensions o f different makes o f the same specified large extent on the size o f the propeller. The larger the sizes o f strip can vary somewhat. Dimensions—and propeller diameter and,or its pitch the more rubber performance can also vary somewhat from different weightfyou canjuse, and the better the performance should batches o f the same make; and in some cases from one be in consequence. You can use Table X X I for working end to the other o f the same batch o f rubber. This is due out the actual length of rubber strip you require for to the fact that the rubber is formed initially as a sheet, making up motors o f different weight. wrapped around a drum for vulcanising and then sub­ sequently cut into strip widths, and variations can occur T A B L E X X I m processing. RUBBER LENGTHS IN FEET FOR GIVEN WEIGHT The effect o f such variations can be o f critical im­ |M o to r RUBBER SIZE portance for contest flying. The merits o f each batch or W e ig h t hank o f rubber need to be established by practical tests, O unces 1x24 i x 30 A x 24 A x 30 1x24 i x 30 in order to be sure that it is suitable; and the best per­ 1 15 18 19 24 30 36 formance usually comes from unused rubber which has 1i 18 23 29 30 37 45 been aged. That is to say, given two batches o f rubber n 22 27 29 36 44 54 from the same manufacturer and to an identical specifi­ U 25 32 33 42 51 63 cation, the one which is perhaps two or three years old 2 29 36 38 48 58 72 will normally have a superior performance to brand new 21 32 41 43 54 64 81 rubber. Sorting out the best rubber for contest flying, 21 36 45 48 60 72 90 21 39 50 54 66 79 99 therefore, is a somewhat tedious business o f continual 3 44 54 57 72 88 108 trial and error. 31 48 59 62 78 % 117 For sports flying it is generally unnecessary to go to 31 51 63 67 84 102 126 such troubles. Once a satisfactory motor size has been 31 54 67 72 90 108 135 found then replacement motors o f the same size in the 4 58 72 77 96 116 144 same make should be satisfactory. Rubber motor weights and nominal maximum turns arc also based on a ‘stan­ dard’ rubber representing typical mean average charac­ teristics, and the aeromodeller can use these with confi­ dence when he is not striving to extract the utmost performance from a rubber motor. Typical strip rubber weights arc shown in Table X X . These apply to dry rubber, as bought. When lubricated the weight o f the made-up motor w ill be increased by about 5 per cent. As a general rule—and again only for sport flying -the rubber motor weight should be between 317 June, 1966^

It is normally most convenient to make up a motor into an even number o f strands, when a single knot can be used to join the ends— Fig. 24. An odd number o f strands would need a loop tying at each end, and knots can be a weak point in rubber motors. It is also important that knots should be tied before lubricating the rubber. A reef knot like that shown in Fig. 25 w ill then hold, provided it is drawn really tight. To avoid the possibility o f tearing the rubber when drawing the knot tight wet the strip first -e.g. by licking it. Knots made in lubricated rubber w ill always force themselves undone again, unless bound in place. The best form o f binding is strong wool, knotted and re- knotted around the original tied ends whilst held stretched to maintain a tight original knot. Again a simple reef

viding some method of ‘tensioning’ the motor so that it remains taut when unwound which really means stopping the m otor unwinding completely. This can be done mechanically, e.g. with a tensioning spring and stop on the propeller shaft as in Fig. 2f>: but is much more simply achieved by pre-tensioning or ‘cording’ the motor itself. knot is satisfactory for the original knot, and this is the Steps in ‘cording’ a motor are shown in Fig. 27. sort o f repair job which can be carried out on a broken Initially the motor is made up to twice the length required strand. and one half the number o f strands (this also means that Lubricating the rubber is most important- and it is the number of strands should be divisible by four to even more important to use only the right sort of lubri­ enable the ends to be joined by a single knot). The most cant. There are only two types— a mixture known as convenient way to lay the motor out is in two ‘legs’— ‘rubber lubricant’ and made up from soft soap and e.g. AC & BC—with a small marker—e.g., a piece of glycerine; and pure (medicinal quality) castor oil. The plastic knitting needle— bound to the centre o f the motor former is a little more ‘slippery’, but pure castor oil is a w'ith a rubber band. About 10 to 15 per cent o f the perfectly adequate lubricant and saves the necessity o f nominal maximum turns o f the motor are then wound on having to make up, or buy, a soap-glycerine mixture in the same direction as you would normally wind the sec Table XXII. Which you use is purely a matter of motor. The two ends are then brought together, the personal preference. middle indicated by the marker slipped over the winder hook and the doubled over motor allowed to unwind. T A B L E X X II This w ill cause the two skeins on the motor to wind up RUBBER LUBRICANT FORMULA into a rope or ‘corded’ form with a considerable shorten­ ing o f its original length. It then only remains to bind both ends o f the m otor w'ith a rubber band to retain it in a INGREDIENT AMOUNT MIXING corded state ready fo r use. Cording the m otor in this fashion reduces the maximum Pure soft soap 4 ounces Bring to the boil slowly (unscented) in a clean pan, stirring turns by about half the number o f ‘cording’ turns all the time. Then allow applied initially. The ‘cording’ turns may need to be Glycerine 4 Tablespoons to cool. adjusted on a trial and error basis—e.g. unwinding and re-cording—to achieve the desired tension. It may also Water i pint be necessary to re-cord the motor, with slightly more ‘cording’ turns, after the motor has been broken in. RUBBKK MOTORS WILL BE CONCLUDED NEXT MONTH A made-up motor o f optimum weight and with a TABLE XXIII NOMINAL MAXIMUM TURNS ‘PER INCH MOTOR suitable number o f strands to match the propeller being LENGTH. (LUBRICATED RUBBER) used w ill inevitably be longer than the distance between the rear anchorage and the propeller shaft (unless the fuselage length has been specially designed to accommo­ date it). In its unwound state, therefore, such a motor

• Typical mean performance with approx. 5% safety margin. Aero Modeller 318

MEMBERS WRITE . . . Handbook or in the Faber book 'M o d e rn Silvaire” of 40" wing span. It is powered Aero Modelling'. As well as the above by a D.C. Bantam glow-engine and will be each contains lots o f very handy tips for completely silver except for blue trim Dear Sir, constructing your first model and lists of along the fuselage. I am a beginner to model aircraft wood and wire sixes available, kits, engines If I can successfully build and fly the building, and enjoy your magazine. dope, etc. "Silvaire" I hope to but some single­ Please could you, in some future edition, channel radio equipment and the Veron print a glossary of terms for beginners "Mini-Robot" plane. The R/C gear will Dear Sir, like myself as I think it would be useful. probably consist of a MacGregor tone I am very pleased that you combined Towcester, Northants. R. Folwell. transmitter and receiver in kit-form. “ Model Aircraft" with “ Aero Modeller". Before I bought the “ Silvaire" I had A glossary of modelling terms for the new­ Before I could not always afford to buy made and flown two gliders, the Keil­ comer to aeromodclling who is confused two magazines but now I am able to get Kraft "Cadet" and " Caprice", and also a with such things as “L.E.”, "T.E.", the benefit of both publications. rubber powered "Chipmunk”. " Gussett" and '‘Braces", etc., can be At present I am building my first found on page 27 of the “ KeilKraft" power model, a KeilKraft “ Luscombe Northolt, Middx. K. Kavanagh GOLDEN WINGS CLUB PAGES Plan of the month____ FLETCHER FD-25 DEFENDER A Simple Sports Rubber Model Designed by W. C. Hannan r P H E basis for this little caricature model was the Rare photo of the Fletcher FD-25 Defender prototype, an unsuccessful military project later developed into a crop duster. Fletcher FD-25 “Defender”. First flown in 1951. the FD-25 was designed by John Thorp, of “ Sky Skooter” fame, as a potential “COIN” fighter, for tatc what almost must be a hand-held-while-drying close-in ground support work. The prototype shown assembly operation. Note that two Λ in. wing ribs in our photo, was constructed largely o f magnesium, are used at each dihedral juncture to ensure adequate but later editions employed the more conventional strength. I he section o f the fuselage beneath the w ing aluminium. opening is removed temporarily while installing the Powered by a Continental E225 engine, the FD-25 wing. had a usable speed range o f from 41 to 1X7 m.p.h. In the interests of saving weight, the light grey of and was capable of carrying a large variety o f exter­ the full-size machine is represented by the natural nal armament in addition to its two 30-cal. machine balsa colour on our model. We also elected to omit guns. The distinctive exhaust stacks are the visual the olive drab on the wing and horizontal tailplane - manifestations of the unique Fletcher “jet-cooled” not because of the w

Dear John Bridge. I am between 10 & 16 years of age and would How’s your like to become a member o f the “ Golden Wings Club” . W ith this application I enclose postal order. (International Money Order) for 2/6d. to cover Aeromodelling cost o f the badge, transfers and membership card. NAME IN FULL ...... Knowledge? ADDRESS ...... test your I. Q. with the . . ·

YEAR OF BIRTH SCHOOL NAME OF ANY OTHER CLUB OR CLUBS TO WHICH I BELONG (if any) SEND TO:- GOLDEN WINGS CLUB. AF.ROMODELLFR, 13-35, BRIDGE STREET. HEMEL HEMPSTEAD. HERTS.

To join, fill in the handy membership coupon and send with a postal order/money order, or cheque to the value of 2/6d. made payable to "Aeromodeller. Post to Golden Wings Club, Aeromodeller, 13-35, Bridge Street, Hemel Hempstead, Herts. Each member will receive his own badge—depicting 'Golden Wings’, a membership card, and two transfers to decorate his model or model box, and will make him a member of 1. The models seen in photograph ‘Γ are? the largest modelling club of all time. John Bridge (a) deltas (b) flying-wings (c) ornithopters TIP OF THE MONTH Id) canards

2. "Mono-line" is? (a) a type o f glider towline (b) a single-channel radio-control system (c) a control-line system (d) a fuel-feed system

3. The following anagrams represent trade names widely known in British modelling. Rearrange the letters to find their names. (a) BRASOOL (b) NERVO (c) REYCRUM (d) TRIKAFLEK

4. The "27" on the fin of model in photograph ’4' sig­ n ifie s ? (a) its weight in ounces (b) radio frequency in M Ics (c) control-line length in feet (d) competition class

5. The F.A.I. A/1 specification is for? (a) speed models (b) rubber driven models (c) radio transmitters (d) gliders

OR CONTROL LINES 6. Put the following engines in order of size (i.e. capacity Winding in glider towlines—and control lines for that m atter- or swept displacement), the smallest first: can be a long and often "tangling’’ business. This simple (a) E D. Bee quick-to-build winch for doing just that chore of winding is (b) Alien-Mercury 049 the brain-child of G. Wilkins of Southall, Middlesex. If any (c) Davies-Charlton Bantam reader wants to make one, and this small winch looks good to (d) Frog 150 us, the sketches supply all the “ know-how’’, on construcfion. (Answers on Page 350)

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MODEL AIRCRAFT < B'MOUTH) LTD. NORWOOD PLACE · BOURNEMOUTH

DISTRIBUTORS IN U.S.A. WESTEE HOBBY IMPORTS. S808 West Chicago Avenue SI, III., U.S.A. DISTRIBUTORS IN CANADA. ACADEMY PRODUCTS LTD., 106 Tycos Drive, Tdronto 19. DISTRIBUTORS IN AUSTRALIA: GEORGE PIZZEY & SON LTD., 131-141 Johnston Street, Fltxroy N.6. Melbourne. 323 June 1966

Extracts from Crawley's news-sheet indicate that it was sheer persistence that got Jack Allen and Chris Foss their A/2 John O’Donnell scores, whilst Peto Cameron broke two Coupe d'Hiver models. I rather like the description applied to the second—which was run over by a passing car—"at least it died with its boots on". comments on the A little further south Graham Head flew at Beaulieu to total around 41 mins in power, mainly by virtue of ono flight timed o.o.s. at 2:45 (that landed at about 3:20 and travelled, so it is first contests said, 3| miles). The reason why he doesn’t appear in the S.M.A.E. results should be quite interesting—especially to the declared winner, Alan Moss o( my club, who flew with the of the year N.W. Area at Chetwynd. Having mentioned the S.M.A.E. results and already having described theadventures of the contest winners there isonly one further point. The entry was almost unbelievably low, there on Free Flight being just 21 scores spread over four events, and consequently the question of declaring the contests void was raised in the S.M.A.E. council. Results are upheld (see page 350). The first of the S.M.A.E.'s 1966 contests will probably be remembered lor a long time by the handful who Hew. Partici­ pation in area-centralised events under adverse conditions has S M A E events always been under tho shadow of '‘someone else having better In comparison the events on 17th April should he well weather". Usually this is true enough—but March 27th had supported. The N.W. (and Midland) had breezy, overcast and something unique in the way of universally bad weather. From cold conditions at Chetwynd—but thero was a fair amount of what I have heard it would seem that there was little to choose activity from those who attended. Only one treble was scored in betweon different parts of the country. each of the rubber and glider events. Fly-offs were held in very I went to Topcliffe to fly with the Northern Area. At least this cold and uninspiring conditions. Brian Day's 3:11 in the Gamage was on tho loosido of tho Pennine* but it seemed to make little was very hard to see—whilst Davo Yatos did well to do 2:11 in ditference. Windspeed was estimated (by others) to be 35-45 glider. He attributes lus success in this event to the silencer m.p.h.. but it was gusty and there were momentary (compara­ rule! He was the National winner anywayl tive) lulls. Three York members tried to fly glider, presumably Joe Savini, as the area’s F.A.I. Power specialist, provided top with eyes on the Plugge Cup. but failed to get away. Henry score with about 131 mins and demonstrated just how impor­ Tubbs and I fared somewhat better in rubber, although Henry tant it is to have a good motor when using straight fuel. The fuel showed remarkablo perseverance in continuing after smashing caused much discussion both at the contest and the previous ono model on his first attempt. Technique was to wind in the day's Area meeting regarding who should provido it—organ­ shelter of a car or van. then stand there with the fully-wound isers or competitors. In the evont fliers used their own. Perhaps model until the wind decreased for an instant, step back two the best solution is a quick chemical test for nitro additives. paces and release the model smartly! This gave us two flights One aspect of the S.M.A.E. events deserving comment is the each—Henry's second and decislvo flight being a max with revised system of scoring for National Championship. With brilliant afternoon sun giving good visibility. I lost one model, only six area events (one per meeting) now counting, plus three and found tho roservo spread in small pieces over half a field. at the Nationals, the Championship is no longer tho endurance I also found Henry's ancient Wakefield for him; undamaged but test that it was previously. It still demands as many models (to too late for anothor flight. cater tor all events) but there does seem a little more interest in it—or there was before March 27th. As the Plugge Cup (Club championship) is decided on EASTER AT CHOB- HAM and R. Lorente, six events at area contests it seoms very strange that the same of Lee Bees, displays events were not selected for both club and individual champion­ his Coupe d’Hivcr ships. It only affects a few people (or clubs for that matter) but model. Has motor might well have been a better system—saving an unnecessary tube of two lamina, division of interest. tions of 1 /32nd balsa .md a pop-up rear fuselage detnermaj- Ea ster iser. Wing airfoil is In between the two Area centralised events came Easter, from Jim Baguley’s with meetings being held at different ends of the country. The A /2 gliders. At bot­ N.W. Area’s annual event is reported separately at some tom is B. Calais, length. The clash of dates with the South of England Free from Southampton, who was placed 4th Flight Gala at Chobham was not an unfortunate coincidence— in Open Glider flying the Southern meeting being deliberately staged as a counter A /2 with rear fuse­ attraction by some of those dissatisfied with previous Tern Hill lage a laminated meetings. Their main complaint in previous years was the 1/32nd sheet balsa restricted car parking (and resultant hike across tho 'drome) and tapered boom formed it is more than ironical that this year should see tho relaxing over a billiard cue, as of these regulations. The result was a much happier meeting with our full size plan this month. and a marked absence of complaints. A report from Chobham has been sent by Martin Dilly and gives a good onough picture to quote it verbatim:- "The first day was generally sunny with winds around 10-15 knots S.W.with patches of strong lift, buttowards lato aftornoon conditions calmed quite a lot and the fly-offs were made in negligible wind and little lift detectable on the ground. Entries were good and Lcn Larrimore of Lee Bees topped a list of 47 in Open Glider, flying a six-year old modified "Luci­ fer" with a fine crop of mildow and a number of interesting warps. Second man Hansford of Blackheath had an impressive all sheet Jedelsky A/2 that did a creditable 4:35 at a height of about 150 feet all the way. Mike Brown of Maidenhead lost his 1A model on its final max. so John Boxall of Croydon only had to make a nominal fly-off time to win l A Power. A/2's led the field in combined F.A.I. but fly-off was not necessary. Continued on page 326 A e ro M o d e lle r 324 ENGINE TEST by Peter Chinn Enya -09-ΠΙ

1.6 c.c. Japanese glow plug engine now completely redesigned

the avoidance of other modifications that would require expensive re-tooling. The 09-111, in fact, contains no parts whatsoever that are common to the 09-11. As originally designed, the Enya 09 had the usual arrangement of opposed rectangular cylinder ports with the transfer passage between the liner and casting. In the 09-11, this latter was abandoned in favour of twin transfer flutes formed in the inner wall of a very thick liner. The bore and stroke of r F IIE 1.6 cc Enya 09-III glowplug motor, as its name the 09-11 model remained the same as those for the ·*■ suggests, is the “ Mark III” version of the well- M k. 1 engine and a similar crankshaft was used, but established Enya 09. an engine that appeared in its all new castings were used and the engine had a original version in the early nineteen-fifties, this low'er cylinder height and a more modern appearance. being succeeded by the 09-11 in 1960. A ll three models are shaft rotary-valve, loop- Improved Induction System scavenged engines, featuring a unit cylinder crank­ In the 09-111. the twin internal flute-type transfer case casting with drop-in cylinder-liner and a detach­ system is retained but, as we have already remarked, able front housing containing the main bearing and all component parts are new. This engine is, in effect, carburettor. Beyond this basic specification, how­ a complete redesign o f the 09-11 and the need fo r so ever, each model has differed quite considerably many new parts is a result o f the adoption o f a from its predecessor. The development' policy of lower stroke/bore ratio and a bigger shaft and both the leading Japanese engine manufacturers improved induction system. (Enya and O.S.) appear to be quite unhampered The crankshaft now has a journal diameter of by the more commonly accepted practices of model 8 mm. (0.315in.) instead o f 7.5 mm. This has permitted engine production economics, such as the continued a larger valve port and a larger bore gas passage-- use of the same castings through several models and now 6.2 mm. instead o f 5.5 mm., an increase in cross-sectional area o f over 27 per cent. The intake aperture through the bearing is still of an elliptical shape (unlike the larger Enya engines it does not feature straight sides for more rapid opening and closing), but is considerably larger. The rotary-valve has been re-timed to close about 5 deg. later at 50 deg. ATDC, the total induction period being approximately 190 deg. of shatt rotation. A very much bigger bore car­ burettor intake is also used: 7.0 mm. instead of 5.8 mm. Having regard to the fact that both the old and new intakes are sub-

Parti of the Enya 09-111. Noteworthy are the very thick cylinder liner with internal transfer flutes, robust con­ struction and good finish. 325 June, 1966

stantially reduced by a 4 mm. diameter spraybar, the actual choke area of the 09-111 is more than double that of the 09-11. As supplied, the 09-111 is fitted with a sleeve, held in position by the spraybar to restrict the choke area, but a very’ worthwhile increase in power is evident when this restrictor is removed. The larger bore cylinder liner is also thicker. Its wall thickness is now a full 2.5 mm., or approximately 1/10 in., and thus very rigid. As before, it is located, not by a flange on the top of the liner, but by an annular seating in the casting. This seating is now widened on the exhaust side and narrow'cd on the transfer side so that the transfer flutes are in no way restricted. Incidentally, the timing of both the exhaust and transfer ports is quite conservative, the exhaust remaining open for 122 deg. and the transfer ports for only 98 deg. of crank rotation. Thanks to the shorter stroke and a slightly lower piston height above the gudgeon-pin centre, both the crankcase width and overall height of the engine arc slightly reduced. The new crankcase/cylinder casting also has heavier beam mounting lugs, a small lug in the rear of the crankcase which may be drilled and tapped for a pressure nipple (for a crankcase pressurised fuel system) and a tapped lug earlier model. When starting from cold, the 09-111 in the centre of the exhaust duct to which, if the was fa irly critical to mixture strength. It needed a engine is converted to throttle-control, may be reasonably rich mixture to fire, but then tended to attached a coupled exhaust blanking plate. draw an excess of fuel which could cause it to stop. The engine is well made and nicely finished Some engines w ill tolerate an excessively rich throughout. Machine finishing is employed on the mixture and splutter away until they have cleared it. castings to an extent now more usually absent on The Enya does not appear to be one of these. Warm modern small engines. Both joint faces o f the bear- re-starts were much easier. ing-housing-lo-crankcase joint are. for example, The needle-valve setting for best performance was machined, despite the use of a gasket between them. fairly critical on the 5 per cent nitro fuel used to this The cylinder head also has a machined surface to point, but became noticeably less so on a substantially make a gas-tight mctal-to-metal joint with a raised hotter fuel. We substituted a “ racing” type mixture rim on the cylinder liner. containing 30 per cent nitromethanc (pure nitro- methane. not the 70/30 nitro/mcthanol blend that Performance is the only commercial grade now available). This Received prior to the engine’s release in the U.K., added 700 r.p.m. to the engine’s revs on an 8 x 4 our test model Enya 09-III came direct from Saburo Tornado nylon. 800 on an 8 x 4 Power, 900 on a Enya. one o f the three brothers who run the model 7 x 4 Tornado, 1.000 r.p.m. on a 7 x 3 PAW, dropping engineering business bearing their name. Enya sales back to 800 on a 7 x 3 Top-Flite. We then removed in the U.K. are, o f course, handled by the K cilK raft the venturi restrictor and ran a further series of organisation. W ith the engine were two of the new tests on 30 per cent nitro fuel. This added another Enya No. 30 platinum filament glowplugs. These substantial gain, particularly at speeds above 15-16,000 have finer filaments than the good, but expensive, and resulted in the curves shown, including a peak N o’s. 4, 5 and 6 plugs made for the bigger Enya output o f just over .24 b.h.p. at 18,000 r.p.m. engines and may, therefore, be more reasonably priced (Continued on page 326) on the U.K. market. We used these plugs for our tests of the 09-111 and found them very well suited to this motor. The 09-111 was given about one hour o f inter­ mittent running-in time and another 30 or 40 minutes was accumulated during preliminary r.p.m. checks on various props using a low nitromethanc content (5 per cent) fuel mixture. From this point onward, it became increasingly apparent that this new Enya was going to emerge as one o f the most powerful 09’s to date. The nonchalant ease with which it turned quite large props (over 8,000 r.p.m. on a 10 x 3 | Top-Flite wood) left one in no doubt as to its exceptionally high torque at moderate speeds, but speeds o f 12,200 on an 8 x 4 Power-Prop and 15,200 on a 7 x 3 Trucut also indicated that this high torque low down w-as not gained at the expense o f top end power. These im ­ pressions were, in due course, confirmed by the torque figures obtained at various r.p.m., from which the torque and power curves were plotted. Starting and handling were, in general, good, but not, we thought, quite so foolproof as with the Aero Modeller 326

This power figure is, in our experience, second only in the “09” category to the Cox Tee-Dee 09 on SPECIFICATION similar fuel. The maximum torque, registered by the Type: Single-cylinder, air-cooled, loop-scavenged two- Enya? o f 17 oz. in. is the best recorded by any engine stroke cycle glowplug ignition. Shaft type rotary-valve in this capacity group. Λ side-by-side comparison of induction. performance figures recorded under similar conditions B o re : 13 mm. (0.5118 in.) S tro k e : 12.2 mm. (0.4803 in.) for the two engines suggests that the Enya is, in S w e p t V o lu m e : 1.619 c.c. (0.0988 cu. in.) fact, the better of the two up to 14,000 r.p.m., after S tro k e /B o re R a tio : 0.938:1 W e ig h t: 3.7 oz. which the Cox pulls away gradually by virtue of its General Structural Data higher peaking speed of nearly 20,000 r.p.m. Pressure diecast aluminium alloy crankcaselcylinder- Most noticeable at all times was the very steady block with drop-in steel cylinder-liner. Pressure diecast running of the Enya. This applied equally with or aluminium alloy detachable front housing with cast-in without the venturi insert despite the fact that, with phosphor-bronze main bearing. Hardened, counterbalanced the open intake, ordinary suction feed was still used. crankshaft with 8 mm. dia. journal, 6.2 mm. bore gas The engine burned out one plug (when running at passage and 4.5 mm. dia. crankpin. Lightweight lapped 17,600 r.p.m. on a 7 x 3 Top-Elite), but the replace­ cast-iron piston with fence type baffle and fully-floating 3.5 mm. hardened tubular gudgeon-pin with brass pads. ment No. 30 plug withstood several successive runs Pressure diecast aluminium alloy connecting-rod with at higher speed on 30 per cent nitro fuel. bronze big end bush. Pressure diecast aluminium alloy No silencer was used during the tests. The existing finned cylinder-head with machined joint face and cast-in Enya silencers do not fit the 09-111, but the manufac­ bronze thread Insert for glowplug. No cylinder-head gasket. turer will doubtless be offering a suitable unit for Machined aluminium alloy prop-driver fitted to matching tho 09-111 in due course. taper on crankshaft. Nickel plated brass spraybar assembly with optional venturi insert. Beam mounting lugs. Power I Weight Ratio TEST CONDITIONS 0.82 b.h.p./lb. as tested on 5 per cent nitromethane fuel Running time prior to test: Approximately 1} hours. Fuels used: (i) 5 per cent pure nitromethane, 25 per cent with restrictor Ouckhams Racing Castor-oil, 70 per cont I.C.I. Methanol, 1.04 b.h.p./lb. as tested on 30 per cent nitromethane (ii) 30 per cent pure nitromethane, 25 per cont Duckhams fuel less restrictor Racing Castor-oil. 45 per cent I.C.I. Methanol. G lo w p lu g s u se d : Enya No. 30 1.5 volt platinum filament, Specific Output 3/16 in. reach. 116 b.h.p./litre as tested on 5 per cent nitromethane Air Temperature: 52 deg. F. fuel with restrictor B a ro m e te r: 30.10 in. Hg. 149 b.h.p./litre as tested on 30 per cent nitromethane Silencer Type: Nil (see text). fuel less restrictor

FREE FLIGHT by J. O'l>onnell Continued from page 323 In Coupe d’Hiver P. Lorente of Lee Bees had a neat model, using a rollod doublo 1/32 balsa fuselage with a pop-up rear portion for the D.T. and an airfoil of Jim Baguley’s originally used for A/2's that has proved quite successful on smaller chords as well. On the second day the wind had swung to N.E. and was a little lighter but visibility was rather poor at times, a number of models going out of sight below the tree line, and there was an occasional light drizzle or heavier condensed mist. The pre­ sence of an encampment of gypsies/general dealers at one end of tho car park didn't result in the expected strife possibly because they were outnumbered. The only man to do a full house in Open Power was Don Edwards of St. Albans, but the situation was normal in rubber with eight In the fly-off, Wishor of Croydon coming out top. In A/1 Andy Crisp of Croydon used a Wakefield Wing on a pylon fuselage to win. although his second flight was lost in the murk after 2:38. No difficulties were encountered with car parking, most people operating straight out of their vehicles, nor were there any cases of exposuro, exhaustion from upwind trekking or acuto irritation. No programmes were sold!" It would seem that some people like events organised and some like them casual. One who got the best of both was Glider specialist Pete Tronchard, of Oxford, who went to Chobham on Easter Sunday and Tern Hill the following day. I thought I was the only person who tried such tricks! South of England Free-Flight Gala—Chobham 10-11 April, 1966. R e s u lts : Open Glider. 47 entries. 1. L. Larrimoro (Lee Bees) +9:45. 2. P. Hansford(Blackheath) +4:35. 3. A. Wisher (Croydon) +1:49. iAPower. 10 entries. 1. J. Boxall (Croydon) Tail-less winner at Tem H ill was Ken Attiwell with pusher that +1:23.2. M. Brown (Maidenhead) 9:00. 3. K. Smith (Croydon) employs rearward folding prop and side-lifting nose fin for 7:08. Combined F.A.I. 38 entries. 1. E. Drew (Bristol A W.) stability. +5:33.2. D.Kidner(St. Albans) I 5:01.3. T. Punter(Hnyes) +4:37. Coupe d'HIver. 17 entries. 1. R. Johnson (St. Albans) 5:37. 6:45. 3. G. Cornell (Croydon) 6:17. Open Rubber 18 entries. 2. D. Tipper (St. Albans) 5:31. 3. G. Cornell (Croydon) 5:11. 1. A. Wisher (Croydon) +5:48.2. C. Foss (Brighton) +5:26. Open Power. 24 entries. 1. D. Edwards (St. Albans) 9:00. 2. P. 3. A. Wells (Hornchurch) +4:50. Chuck Glider. 7 entries. 1. A. Buskell (Surbiton) 8:57. 3. J. West (Brighton) 8:41 A ll Glider McCombie (Blackheath) 3:48. 2. A. Slater (Leatherhead) 18 entries. 1. A. Crisp (Croydon) 8:38. 2. P. Newell (Surbiton) 3:42. 3. A W ells (Hornchurch) 3:02. AIRCRAFT DESCRIBED No. ISI MAURICE FARMAN “ SHORTHORN” drawn by Ian R. Stair

W riting in his book Wind in the Wires Duncan Grinnell-Milnc, M.C., D.F.C., offers an authentic impression o f the Farman as he saw it during the early days o f his flying training. It had an elevator—or stabilising surface—stuck out in front upon curving outriggers of wood, and a double set of stabilisers—or elevators—fixed to wooden spars at the stern. But for the propeller, which drove the machine inexorably forward, and the arrangement of the pilot’s seat and controls, it might have been designed to travel in either direc­ tion. Officially it was called after its inventor: a Maurice Farman biplane; but it was better known as a “Longhorn”, because of the outriggers to the forward elevator. A slightly more modern sister-ship was called the "Shorthorn”, because the inventor rPHESE were the “Tiger Moths” of World War had. rather rashly we thought, done away with the outriggers and elevator. The allusion was, of course, A One. Their exploits were legion and their duties just as mixed as that of the much later Tiger Moth. to famous breeds of cattle and taking them all round, the aeroplanes of Monsieur Far man's breeding were Both being early machines and somewhat limited in speed (60 m.p.h.) as well as a rigger’s nightmare, pleasant beasts. But except for slowness and docility the two Maurice Farman designs have tended to the resemblance to cows ended with the horns. To the uninitiated eye the Longhorn presented such a become overlooked by modellers and historians. forest of struts and spars, with floppy white fabric Originally created by Henri and Maurice Farman drooped over all, ns inevitably brought to mind a at Billancourt, France, the type numbers were offi­ cially S.7 and S .II. Made in England by numerous prosperous seaport in the heyday of sailing ships, whilst piano-wire was festooned everywhere to such contractors, notably the A ircra ft M fg. Co., at an extent that the wrecking of a few of these Hendon, these trainers were to provide basic experi­ ence for many who were ultimately destined to machines before the lines in Flanders would have provided our troops with

Heading photo shows the brave aviators and Short­ horn 1032 with 70 h.p. Renault engine. This one has the pointed rudders carrying manufacturers’ initials on the inside faces. Natural clear doped linen finish. I.W.M. Photograph Q 58S97. To the left is a Longhorn taking off from Hendon with “ Daily M irror” photographer on board. Note the foreplane. Above is B 4722, built by the Aircraft Mfg. Co., it has rudder stripes on outer faces only. At left is A 2141 with rudder stripes all round plus nacelle and wing roundels. Acknowledgement is duly accorded to the Royal Aeronautical Society for research material. RIGGING OF WING AND TAIL BOOMS

1 n — --- p A A x // l x — i- Height- of rear spar above leading edge. 40 mm at centre section. 30 mm at outer strut. R. H. wing . Outside rudder. m 50 mm at outer strut. L .H . wing. Red — —, 10 mm wash out at outer strut White i Pu

FRONT VIEW Strut braced wing extensiol (Tail unit and tail boom: n.

nside rudder. French aircraft Spring skid FRENCH M F.ll PROPELLER - RENAULT British and Italian (both sides) Red

Italian Farman 5B Fiat A . 10. engine with lane radiators on each side of noo Observer in front with gun. j French and Italian:- Clear dope all over. French Roundel. N o t e : Italia British:- i--- Blue Caait I I— White maiF Khaki green. Top surfaces. Red Nacelle a nd fin. upsei Under surfaces clear doped. All Aircraft:- m BRITISH MF 11 (WHITEHEAD BUILT) Struts, booms, propeller dark polished wood. Some British training aircraft were clear doped \ a ll over X Roundel French and British f I Control c unit

— 1----- r -E>Ji

AL Ψ Inner struts p— Outer struts Italian aircraft had the underside of the Reprints of this feature plus 1 / 48th scale dye-line prints of the L .H . wing tips painted green and the R .H . original arc available as plan pack AJ 2864, price 2s. 6d. from wing tips painted red. This usually extended AEROMODELLER PLANS SERVICE, 13/35 Bridge Street, Hemel to the outer struts on the top wing and to the Hempstead, Herts. Tracing by A. P. Lloyd inner struts on the lower wing.

MAURICE FARMAN M F.ll. SHORTHORN. DRG. BY. IAN R. STAIR. 1966.

l/72nd SCALE DRAWINGS CONTINUED ON PAGE 333 7T O P PUTE ΜΟΝΟΚΟΤΕ ISCIEIMTIFICI

CARL GOLDBERG MODE

MORE ’CG’ FALCONS have been built and flown since 1963 than any other R/C design! Rugged, functional and stable . . . engineered for fast building.

ACCESSORIES 142/6 37' span, engines 29- 35 FALCON 56 nosegear P-5 ID in superb 1" scale detail 5/6 JNR FALCON 54 6 FALC O N S6 . . . 131 6 SNR FALCON 252 - 37* span for single­ 56' span for single to 6 69' span for 10 channel FALCON Jnr nosegear channel and 049 engines. channel, rudder-only or multi or proportional. 2 II Wing area 250 sq. in. multi-training. Suitable .35 to .45 engines Wing 1 ' NYLON TAPE 2/6 Weight 16 ounces engines ,09’s to .19 area 810 sq. in.

87/6 A L L F A L C O N S A N D # Co.1 somne nose rear . . formed main gear · New simp!· "Symmtt TRU” w.n* construction 28"’span. Engines S K Y L A R K S f f A T U R l : . shaped and notched leading and tr*d«,g edges · ComP*

87/6 i f l engines Jr SKYLARK . . . 54/6 2 7 'span Ifcr .15- 29 37" span 049 or twin 02’s. P-47 T H U N D E R B O L T super scale & stuntable. SKYLARK 56 . . . 153 6 56" span for single to 10 channel Engines .09 to .19 (single or twin) All these TOP FLITE control line kits include PREFORMED FUSELAGE SHELLS for easy, accurate assembly. £Aoeft*inq! ML.,I · » . | Μ ■ C ·

Semi scale STUNTERS

54'span-Engincf .19 to .40 4 2 'span 65,- A SUPERB KIT . . . 197 6 SKYLANE 6 3 "span 2I9 6 Here's the most beautiful R/C model ever kitted— Two beautiful semi-scale models—the *42‘ for a Goodyear Racer with enough stablility for single channel and 049 engines; the ‘63’ for full ANYONE to handle! For 6, 8. 10 channel or URRICANE semi-scale for 19's to 35's house or proportional and engines up to .45. Proportional. For Contest or Sport flying.

FULLY 42' span STUNTABLE! CURTISS P-40 TIGER SHARK semi-scale . . . 65/-

SW OR DSM AN I8 . . . 21.6 L IL W IZ A R D LIL JUMPING BEAN ...21/6 18' span for 02‘s-049‘s 21' span stunt-trainer 21'span (Astuntcr %A FORM-FLUES (SCALE U/C)

1 8 'span Take any 049 engino Fully prefab kits—assemble Design-engineered for in an evening. C O M BAT perfection in per­ Just the job for JU N IO R formance . . . quality . . that sparo } A ( j SA TA N 27 6 value! All kits fully pre- engine! 29” span for 09’s up. fabbed in selected TOP 42' span H ELLC AT - ZERO - LIL SATAN . . . 16/6 QUALITY balsa and in­ SHOESTRING . . . 54,6 THUNDERBOLT 19* span for 049 Combat clude hardware, etc. .. Profile stunt for 19’s-35’s “RIPMAX” for the WORLD’S BEST KITS . . . ENGINES . . . RADIO SPECIALLY DESI6NED FOR RADIO CONTROL

Sterling models have achieved International recognition as the pacemakers in setting consistently higher standards of authenticity, beauty, per­ formance and quality. Today, Sterling continues to create SPITFIRE 6 4 " span . . . £16.9.6 M U S T A N G 66- span . . . £16.9.6 FAIR C H ILD PT 19 45 span £5.9.6 the world's finest kits—all Superbly authentic all-action model Absolutely complete prefab kit for For radio, sports Free Flight or Control remarkably easy to build! for multi-channel radio. Plans also 'm ufti' radio or control line Over 160 Line! Prefab kit includes metal cowl loin the Sterling fans! show control line conversion. hardware parts! all hardware, fully detailed plan.

• § ψ0 * W IZARD 54- span . . . £7.2.6 L 'lL R O U G H N E C K 22J” span KING COBRA 70* span . . . £16.9.6 Semi-scale biplane for single or multi The fabulous 'Mambo' sport or £2.3.6 Specially designed to bring out Superb fully aerobatic performance on radio and engines 09 up to .45. A trainer design in 52" span size for .09 cho best in single-channel performance 8 to 12 channels with real semi-scale superb kit to.1 9cngincs.1 to6channels. and ,10or .20 engines. appearance. Takes proportional, too.

DENIGHT SPECIAL Here's the model to delight 'Pylon Racer' fans. Matches .19 to 40 engines. Super de luxe kit . . . £10.19.6 CONTROL LINE ^

These two scale biplanes offer NEW REALISM and PER­ FORMANCE for C/L fans. CROP DUSTER . . . £4.18.6 SE5 . . . £4.18.6 Fully prefabbed kits 32}- span for .09 to .19 engines 32- span for .19 to .35 engines

FOKKER D 7

}A SCALE C L BIPLANES FOR YOUR SPARE 019! All balsa construction and FULLY PREFABRICATED . as easy to assemble as a plastic kit! Moulded plastic cowl, all WORLD WAR I SPAD CURTISS HAWK FIGHTER hardware, authentic transfers, etc 18* span. Take any .049 engine P ric e 2 l/ll each

S-RAY 125,- SOMETHING N EW IN PREFABRICATION ! 50" span for .07 to .10 r BOX-LOK construction, with parts so accurately finished «hat engines and rudder-only ror fuselage can literally be assembled complete in your hands! single channel (esep. or R/CThe last word in FULLY PREFABRICATED KITS! servo).

NEW! ...NEW!... AEROMASTER . . . £18.19.6 Designed from the start as a fully aerobatic RfC biplane, this mag­ nificent 48" span model takes 6 to 10 channel reeds or Proportional. H-RAY Engines .46- 61. 142 6

NEW! ...NEW!,..NEW!... SPORTSMASTER . . . £16.9.6 The first model that REALLY DOES THE NEW FREE STYLE AEROBATIC SCHEDULE! 6 to 10 channels, or Proportional. Span 67". Area 740 sq. in. Engines .45-.61. For sport or contest, beginner or expert! 50” span for .09-, 15 engines and single channel or 4 to 6 channel e f t · : 4 H • ·· - ■ PREFABRICATION THAT IS TANGIBLE! FINEST R/C GRADE BALSA! TOP MODEL DESIGNS! CONTROLS SEE THEM ALL AT YOUR LOCAL MODEL SHOP!! AMERIG A ’S EIES1' brought to you by...... Tt/pAfax MCCOY EHGINES The supreme quality glow engines built to the highest engineering SPECIFICATION standards—second to none in performance and reputation! • f l M l 19 BB Standard . . . 2 HD- McCOY 19 STUNT Suite .611 Oise*»«ew«nl I* 6 4 j" span full 19 BB R C . . . 2S9'6 Snappy ihO'l engma for fraa flight or »··)·■' SOeuxes house or propor­ 35 Standard . . . 190- conuol line Juit watch tional. Engines 35 R'C S pecial. . 231» is lick the other IS'!— nP haiwe CO il II CM .35-.60 - N E W 61 Std . . . 390.- V T N E W 61 R/C . . . 510 - ' * SPCCIFICATION HeCOY 19 r ;c Sam· tprcificason at the 17 HeM. b it fine·! with the ip etitl MtCoy bn- OstUuienl IS GLOWPLUGS rel.typr throttle for t/C V E C O 107 long Reach 5 6 work Po~«r so fly a w » y i yoauetas faun'. or limilar me-:«l. H P. R asn · 491111.000 PINTO V E C O 108 R/C 10 6 38J"span for M cC O Y 40 I 6/11 049's 76 6 SPECIFICATION McCOY 29 STUNT KutJte power k'plmey L 'lL for that larger f r · · flight PINTO or eontrol line stunt model. Develops ore- 25" span for one half horsepower .010 s 43 6 only 74/61

McCOY 35 STUNT LOW or SHOULDER WING Largo- :or# and tttoke i not a pored out 171 for a genuine 06 BHF at only 7 cuncet w r g 'tt Superb for control line ___Kune. ♦;*!____

McCOY 35 R C Handles those O n e ' -n it. models · lightweight g·»·. er f 56 span A f real pep into a med fo r ,45’s '■* ' ti i t R/C iob. Vi feU throttle control THUNDERBIRD, a worldwide contost winner ceil, IM/61 and super de luxe kit . . . £6.5.0 McCOY 40 STUNT s«ciriCATK)N leereated tt-ok· giving that littlf extra In per· 'orma-te Or ‘ andllng thoee really bn! «onwel- l.ncrj 0r larger free flight models.

McCOY 40 R/C Same specification as '*V SPCCIFICATION with throttle for R/C Th.s is the -deal choice of power plane for R/C pylon racing O' the lighter ‘full house' esult S M O O T H IE £5. 5. 0. lObs around 6C" ipa- 52" span contest stuntcr by Bob Palmer advanced aerobatics 29's or 35 V ______fo r o n ly PROPORTIONAL £125 complete

★ SUPERHETERODYNE — FAIL SAFE — FULLY TRANSIS­ TORISED i t DUAL SIMULTANEOUS W ITH TRIM. PLUS MOTOR SPEED TONE MODULATED FOR MAXIMUM NOISE REJECTION. TEMP STABILISED ★ AD DITIO NAL SERVO CAN BE USED FOR; COUPLED AILERON & RUDDER I Why pay more! This out- Citizenship "Reed”“Reed’ Outfits m itter (choice of SINGLE­ STICK OR DUAL STICK), The World s Best ‘Multi’ Value ·/ Receiver, 3 servos, and THE NEW ready wired harness board. SUPER ECONOMY SIX Tx-Rx C om bo WONDER Simply plug together, add 6- ch Tx, 6-ch supcrhcc Rx only £54-10-0 FINISH! batteries and GO PROPOR­ HobbV*v S' TIONAL' DE LUXE CONTEST TEN Tx-Rx Combo CLEAR and COLOURS 9/6 FILLER 9/6 W ith e x tra servo (£140) 10-ch Tx. 10-ch superhet Rx £89-10-0 HARDENER 9,6 THINNERS 10/6 -STUFF·· 9/6

Every item selected by RIPMAX for distribution to modellers in this country is flight tested and proven by our expert staff. It has to be good to be selected by us—and it comes to you with our guarantee of satis­ faction. RIPMAX bring you the world's best—and the largest range of kits, engines, radio controls and accessories available in Britain.

RIPMAX MODELS AND ACCESSORIES, 80 HIGHGATE ROAD, In case o f difficulty in obtaining any of these items write:— LONDON, N.W.5 Telephone: Gulliver 5108 1/72nd SCALE DRAWINGS CONTINUED FROM PAGE 328 Aero Modeller 334

YOUR FULL-SIZE FREE PLAN CUE DOT a 51 inch wingspan A/1 specification glider

Designed by Martin Dilly

When the first blank is dry unwrap the rubber but try to leave the Sellotape intact; now use a steel straight-edge and cut the seam accurately along the length of the overlapping edges, cementing the joint with P.V.A. glue, after having first waxed the mandrel to prevent the whole lot sticking together. Using a strip of paper as a flexible rule, measure the outside diameters of the ends o f the balsa lube, remove the tube, and mark the mandrel where these diameters occur; use these marks for the ends of the second layer, which is made in the same way as the first, direct onto the mandrel, but slid along a little way to give a larger diameter. However, do not cement the seam. When this layer is dry remove it, replace the first tube, coat it thoroughly w ith Casca- mitc or a similar cold water resin glue, slide on the outer layer and tape up tightly; surplus glue will be TTHIS model was constructed because a similar forced out of the scam and will bond both layers A structure and aerodynamic set-up worked reason­ together. Wipe off any surplus glue, and fill any gaps ably well in A /2 size and the author was interested with slivers o f balsa while the glue is still wet. Also to sec how the Benedek 6456-f airfoil performed with while the glue is still wet, make sure that the mandrel smaller chord sizes. w ill move, pulling it out slightly if necessary. Λ sheet upper surface is used for the wing as with A ll right, so you’ve got a boom. Now cut the the thin airfoil employed, there isn’t enough rib keel from plywood and the soft balsa side pieces, depth at the rib to trailing edge joint to provide carving the rear o f these to a circular cross section to adequate strength; by using a strong but light grade fit into the boom, but do not cement anything yet. o f iV. in. sheet, lightly sanded before use and When you’re happy that everything fits snugly to­ weighing 0.55 to 0.65 ounces fo r a 4 in. wide yard, gether, lash the wing, fin and stabiliser into place the structural weight can be kept within acceptable (these w ill have been made while the boom has been limits. drying) and hold the skid and timer in place with It is advisable to start construction with the boom. Sellotape. You ought now to be able to get a rough Commence by selecting two yards of the lightest idea of how much lead to put into the weight and most Tollable Ar in. tangent cut balsa you compartment before the fuselage is finally assembled. can find. Cut so they taper from about 2.4 down to Final fuselage assembly is as follows: 1.4 in. the exact size depending on your particular (1) Cement starboard side to keel. mandrel: a billiard cue was used for the originals (2) Hollow out nose compartment and anywhere but anything else straight and of about the right else you think needs it. taper w ill do. Note that the dimensions at this stage (3) Add lead to nose and cement p o rt side to keel. do not have to be very precise, as final seam cutting (4) Thread nylon lines through boom and tail w ill take place when the blanks are laid up on the block tube and out o f appropriate holes: make mandrel. sure the ends can’t slip back into the fuselage. Now look to see if there’s any natural curve in the (5) Cement the rear o f the nose assembly and slide sheets and. if there is. dope the concave side, or any boom on, after slotting it to take the keel. side in the case of a flat sheet, with a couple of coals (6) Tap the adjustment holes in the dural skid and of unthinned clear dope. This will both curve the epoxy it into place. wood and waterproof one side; when the sheets are (7) Using scrap balsa, fill any gaps in the boom to dry, immerse them in a bath of warm water to curve keel joint and carve and sand the whole nose them even more. to shape, blending it into the boom. The next stage is to roll one o f the wet blanks After that, all that’s left is to thread the paper round the mandrel; this requires a little patience tubes onto the nylon lines and cement them into the and “sympathy for the wood’’. Starting at the large fuselage, attach the fin, tailplane mount, wing runners, diameter hold the blank tightly to the mandrel using dethermaliser and auto-rudder release pin tube. Sellotape and gauze bandage strip or mbber, but do Tailplane construction is straightforward. Use P.V.A. be careful if you do use rubber, as it’s easy to dent glue for all flying surfaces to prevent warping. the wet wood if the rubber strip is wound too tightly. Epoxy the D /T hook in place before covering and 335 June, 1966

When the glue is dry mark the rib positions onto the light 1 / 16th balsa chosen for the wing .skinning, true up one edge so that a neat joint with the trailing edge w ill result, and apply a i in. smear o f contact cement along each marked rib position; contact cement is also applied to the top edges of all ribs. Allow 10-15 minutes for contact cement to dry, then lay a sheet o f paper to mask all the pre-cemcnted Nose close up illustrates adjustable ribs; run P.V.A. along the rear edge of the skinning tow hook tapped and the pre-carved leading edge, and butt the 1 / 16th mounting holes in sheet up against the trailing edge, ensuring that the the Dural skid, and the way the wing ribs line up with the marked rib positions on the mount is carved to sheet. Then slide the paper out chordwise, gently form wing band pressing the sheet onto the ribs and finally pinning retainers. into position along the leading edge. Remove the wing from the board, add tips, centre section sheeting, joiner stops, webbing and gussets and sand the dihedral break ribs to the correct angle; make up a female template for the upper surface and also fo r the leading edge. Carve and sand the wing to a constant and accurate profile. cement the plywood trailing edge reinforcement. Cement the dihedral joint, but do not add any nylon Cover with jap tissue and give two or three coats of reinforcement round the joint; if the wing is going ihin clear dope. to break it might as well do it where we can mend The wing is built flat on the board. The upper it again quickly. The centre section however can be surface of the leading edge is first carved to rough covered with light nylon or silk at this stage. shape and sanded; it is pinned to the board, with its Give the entire structure a coat of thin clear dope rear edge lifted as in the cross section. Build the two prior to covering; cover with lightweight tissue top centre panels and the two tips as separate jobs. The and bottom but note that the upper tissue stops \ in plywood ribs are assembled with the wire joiners in forward of the trailing edge, in order to reduce any position as each centre panel is made. Note that the tendency for the extreme trailing edge to flatten. undersurface of the leading edge is left flat at this Dope the underside w ith three coals of moderately stage, later it is convexed as in the side elevation. thin clear dope and one coat o f 50-50 clear dope and The trailing edge, carved and slotted for the ribs, banana oil; use two coats of mixture on top, sanding using a Λ in, Abrafile or a razor saw, is pinned in lightly between coats. position and blocked up to the correct angle as Wind the timer springs, using a piece o f 12 shown in the section; at this time strips of scrap s.w.g. wire or a suitable d rill shank as a mandrel. Λ can be pinned adjacent to the leading edge to pack Adjust the C o f G position if necessary, by adding up the front o f the ribs, and the mainspar can also lead through the timer compartment. Arrange fo r the be packed up and pinned in position. tailplanc to tilt to about 45 deg. on dethermalisation. Thread the double balsa and plywood ribs onto Test glide, to achieve a glide that’s just on the wire joiners and, P.V.A., glue the ribs into place, stall, and then lose the stall by increasing the turn, followed by all the other ribs, noting the pair of to achieve a final turning circle of about 200 ft. in thicker ribs at the dihedral break; ensure that all ribs diameter. Make all pitch adjustments by altering the are flush with the lower surface of the trailing edge. tail plane incidence.

Materials required : 2 sheets 1/32" x 3 ' x 36' tangent cut balsa; 1 sheet J *x 3 'x 24' soft balsa; 1 shoot 1/16' x 3 ' x 24' quarter grain balsa; 2 sheets 1/16' x 4 ' x 36’ medium balsa; 2 strips 3/8' x 3/16 'x36* soft balsa; 2 strips 7/8"x 3/32" x 36"qunrter g'rain balsa; Tail area close-ups illustrate from left to right, tailplane leading 1 strip 3/8" x 1/16' x 36" spruce; 1 strip 3/16" x 3/16" x 24" balsa; edge pivot platform and dethermaliser line with hook that 1 strip 5/8' x 1/16' x 36" balsa; 1 strip 1/4" x 1/16" x 24' balsa; attaches to wire hoop epoxy glued to tailplane structure. Centre: the tailplane in its dethermalised position, note tension band and 1,strip 1/16' x 1/16' x 24' balsa; 1 strip 3/32' x 3/32' x 24' balsa; dethermaliser line both attached to tailplane hoop. Right: the 1 sheet 1/8" x 5 ' x 6 ' quarter grain balsa; 1 sheet 1/16" x 3 ' x 18' dethermaliser tension band and line attached in flying position. ply; 1 length of 14,16,22 s.w.g. wire; 1/16" I.D. alum, tube; .012" C/L wire; 1/16' 20 s.w.g. dural; nylon. Aero Modeller 336

Peter Chinn’s

The S e«. Super Tigre G.21/29 RV, the first ever disc-valve L a te st Super-Tigre racing engine. Engine News

Super Tigre G2I/29RV /'^N E of the new Super-Tigre G.21/29RV engines ^ has recently reached us from the Micromeccanica Saturno works at Bologna. This is the rear rotary- valve speed motor that Jaures Garofali has had under development fo r the past eighteen months or so and which was held up lor some time while efforts were made to overcome disc-valve troubles. The new crankshaft follows the fashion set by the The G.2I/29RV has been awaited with some eager­ Series 61 and 64 K & B engines (and copied by Rossi ness by speed enthusiasts. We therefore intend to and Moki) in using internal counterbalancing within describe it in rather more detail than is usual in a fu ll disc crankweb, the periphery being sealed by a L.E.N. and, since it continues the G.21 designation, shrunk-to aluminium rim to reduce lost volume in a short account of G.21 history may be of interest as the crankcase to a minimum and thereby increase an introduction. primary compression. Main journal diameter is The G.21 series began nearly fourteen years ago 12 mm., reducing to 7 mm. at the front ball-bearing with the introduction of a 5 cc. shaft-valve glowplug At the front, the prop drive assembly includes an engine having twin ball-bearings in a detachable fron t integral 1± in. dia. spinner of machined aluminium housing and a ringed aluminium piston. This original with brass cone retaining nut. G.21 continued in producton fo r a number o f years The bore and stroke of the 29RV remains, at and an exact copy of it later appeared in the Soviet 19 x 17 mni., the same as for all previous 5 cc. G.21’s Union as the Kometa MD-5. Cylinder porting follows the now fam iliar Super- Following the successful launching in 1960 of the Tigre patented system o f inclined parallelogram “ Jubilee” model Super-Tigre G.20 (2.5 cc.) with its shaped transfer ports, timed to open and close simul­ one-piece casting, this form o f construction was taneously with the exhaust port and used in conjunc­ adopted a year or two later for a new 5 cc. engine. tion with a flat crown dcflcctorless piston. Actual This new casting was also used fo r several succe^ling tim ing remains substantially the same as fo r the .Super-Tigre engines, namely, the G .2I/35 (5.65 cc.). previous shaft valve G.21/29 at 71 degrees BBDC G.21/40 (6.5 cc.). G .21/40-R /C and G .21/46-R /C to 71 degrees ABDC. This gives transfer and exhaust (7.5 cc.). It is, in fact, still current in all these except periods that are each about 8 degrees longer than for the G.21/40, now succeeded by the G.40-RR model. the 2.5 cc. G.15 engine. It would, perhaps, have been a little less confusing (Continued on page 33H) if the G.21 designation had been dropped from the new rear induction model, but, probably because the crankcase is produced from a modified version of the standard shait-valve casting and still bears the G.21 legend, it is perpetuated in the G.21/29RV. M od ifi­ cations have included the deletion of the offset front intake and the substitution of a hefty 3.5 mm. thick web between cylinder and front housing, and the Left, the machined integral addition of more metal to the outside of the transfer spinner of the G.21/29 RV passage in order to allow the interior to be machined should ensure ridge assembly and true running. Above, out fo r greater transfer volume. crankshaft follows K & B Series 61/64 design, also adopted by Moki and Rossi. Below, the rotary-valve features diametrically op­ posed drive slots for alterna­ tive carburettor locations. 337 June, 1966

'T'FIE first plastic kit for the revolutionary and con- A troversial swing-wing F i l l A has appeared in Japan (where else!). I t ’s the first venture into the plastic k it field by the forty year old model house of N IS IllK IY A and a more difficult subject would have been hard to find. As a gimmick the kit is interesting —the wings do swing, but the pivots arc a hit crude and allow the wing panels to “ flap” quite a lot after a few operations. Forewarned, one can incorporate in the lower fuselage shell, a supporting structure to stabilise the inner wing panels. For this purpose I constructed a horizontal *Ή ” sectioned structure in 30 thou. Plastikard. Each inner wing section slots quite tightly between two arms of the “FI” which is cemented in place by its lower surface and allowed to dry thoroughly before fitting the wings. This provides the necessary operating stiffness and main tains the lateral wing setting. The kit retails in Japan for about two shillings and scale is 1/ 120th but the length even in this seale works out at eight inches! In l/72nd scale it would be over 13 inches. The same company (JNM C) have fo r many years produced a range of l/50th scale wooden “solid” kits (my remarks last time not withstanding). These SCALE kits arc still made, and in presentation are not unlike the old “ Skybirds” sets— parts ready-carved to shape from beautiful close-grained Japanese Hoh wood. COMMENTARY They arc also available in outline-only form and as completely finished, hand-made models! by J. D. McHARD It is interesting indeed to note that JNM C are not Editor of Meccano Magazine alone in this unlikely field for they have just been joined by another solids manufacturer, SEGA MOKEI. who are producing their models to 1 /75th scale and also in three forms— basic, semi-finished and finished models. A whole range is available including a Hien, Shinden (Καί), F51-D., Bf 109G. They cost two shillings unfinished, six shillings semi-finished. £1 0 Od. finished (F5I-D and M E 109G £! 10 Od.). Labour charges would almost certainly prevent the manu­ facture of such solids in this country at competitive prices even if there existed a market for them, which is very debatable Before leaving this subject it is interesting to consider some of the plastic conversions now· being carried out by enthusiasts. Many such conversions entail almost complete rebuilding of the original kit and demand no little skill. Yet the finished job is still a plastic model, and the considerable effort in­ volved in converting the kit is often not apparent to the observer, who thinks his own straight-built model just as good. The whole object of this widely followed “ converting” game is to produce something different— a break-away from the thousands of other S pit fires. Zeros and M e 109s. Converters write endless screeds to manufacturers bemoaning the fact that their choices of prototype are so uninspired. The unanswerable reply is that unusual aircraft just don’t sell, and it really is true. Enthusiasts constitute only a tiny m inority of the sales necessary to make a kit a finan­ cial success— even so. there are, by other standards. (Continued on page 338)

At top: the F-111A kit by Nishikiya with swing-wing arrangement. How to "draw ” Polystyrene: 1. Holding one end of the sprue with a pair of pliers, heat it in front of an electric fire until it becomes quite soft and floppy and begins to give off smoke. 2, Now grip the other end of the sprue and begin to stretch it. PAUSE when the waisted section reaches the thickness required. If you don’t pause at this stage, the sprue w ill probably part. 3, Draw the ends smoothly apart until a slight resistance is felt— then stop, and hold the plastic strand straight until it cools. The hotter the plastic and the faster the draw, the thinner w ill be the resulting strand. 4, A handful of samples ready for use. Aero Modeller 338

SCALE COMMENTARY (Continued from Page 337) quite a lot of such people. How many of these avid plastic surgeons has ever considered making a solid model from scratch? They would then have complete freedom ol prototype choice and today there is wealth o f information and accurate drawings of the most unusual aeroplanes. No longer any danger of the crushing comment when proudly displaying their pain­ staking conversion, that nas taken dozens of hours - ‘ Oh yes, I ’ve seen those in Woolworths fo r two shill­ ings” ! The amount of ingenuity, skill and prototype research involved in producing an extensive re-work of an existing kit is no more than that needed la build a really good solid from scratch which, properly finished, will look better than a plastic job and give infinitely more satisfaction. Having ridden my hobby horse 1 will now give some Uje of drawn styrene and the Kleintcx nylon rigging is evident hints and tips to plastic carvers! Hut note that these in ' ‘ Mac’s” Wapiti conversion from Frog kit. processes are adaptable to scratch-building, too. Polystyrene drawn in this way lakes on new proper­ Recently I had the job o f building up and elabora­ ties. It is now almost fibrous (like bamboo) but it can ting the rather crude representation of a “Jupiter” be bent without breaking and will hold its bend. The engine included in the Frog Trailblazers Wallace K it. pictures tell the story o f its production and also show The engine exhaust pipes to the front collector ring some applications of the material. The gun and mount posed a problem and I resorted to the following were built up from drawn black plastic, and the en­ plastic “ drawing” technique which, although I believe gine exhaust pipes, with their thin support struts, not my own discovery, nevertheless has not, to m y were also made from the same material— brown this knowledge, been properly described elsewhere. time. Basically the process involves heating the plastic Good rigging makes an old-timer. Without it the moulding sprues that one usually discards, and then whole effect is lost. Bad rigging, with fuzzy thread stretching them to produce long thin circular plastic hawsers, on the other hand w ill ruin it! The answer rods or wires. By varying the heat and the speed o f can be bought in any milliners and it’s called Kleintex the draw any thickness can be produced down to a invisible thread. This is a nylon monofilament and is thin, thin thread that could be used as biplane rigging available as clear or brown-tinted. It has a slight fixing it in place writh a drop of liquid adhesive elasticity and can be tied to strut ends almost invis­ on each end. ibly, remaining absolutely tight indefinitely.

Latest Engine News most powerful commercially made 5 cc. engine to continued front page 336 dale. For some months, pre-production samples have Rotary-valve timing, as measured on our test been in use in the U.S.A. (G arofali’s biggest market sample is approximately 37 degrees AB D C to 55 and now a major influence on Super-Tigre design degrees ATDC. The new rear induction unit includes trends) and these have been putting up some credit­ a reinforced nylon rotor disc running on a steel shaft able performances in Class B speed. American distribu­ and has provision, via alternative drive slots in the tor John Maloney is looking to this engine to provide rotor, for mounting the backplate so that the car­ a challenge in Class B comparable with that which burettor intake is at the bottom left hand corner or the Super-Tigre G.15 has so successfully demon­ top right hand corner. The bore of the intake (9 mm. strated in Class A in the United States. or 0.354 in.) is slightly larger than that of the K&B 29R (0.344 in.) but actual venturi throat area is slightly smaller by reason o f the fact that the surface type spraybar used, projects into the bore, whereas peripheral surface jets are used on the K&B. The cylinder head follows the pattern o f the revious G.21/29 and the G.15 in using a wide squish and and deep hemispherical combustion chamber. The squish area is exceptionally large and covers approximately 64 per cent o f the piston area. The piston's unusual in that it features annular stiffening ribs both above and below the gudgeon-pin bosses while the gudgeon-pin itself, instead of using brass or aluminium endpads. is located by circlips. As is usual with the racing model Super-Tigrcs, standards o f construction and finish are high. As one might exoect. the weight of the G.21/29RV is some­ what higher than that of the shaft-valve model it replaces and. complete with spinner assembly, the engine weighs 10.3 oz. Having received our G.21 /29RV only a few days before w riting this, we have not yet had an oppor­ tunity to lest it for power output, but Garofali is The deep hemispherical combustion chamber and very large rating the G.21/29RV at 1.10 b.h.p. at 22.500 r.p.m. squish area of the Super-Tigre cylinder head are apparent in this which, if substantiated, must make it just about the photo. Rwohtioha/iu Α/βωΙ TOP FLITE rnjL ------* MONOKOTE FROM The covering with the built-in finish The greatest advance in covering and finishing technique in model building history! ‘MONOKOTE* enables ANYONE to pro­ duce a PROFESSIONAL STANDARD finish quickly and easily . . . first time — and every time!

TO P FLITE M ONOKOTE details... I. Cut to size, remove backing, smooth in place. EASY . . . Anyone can get an expert finish . . . every time! FAST . . . Reduces normal covering and finishing to a fraction . . . no waiting . . . gives you more time to fly. STRONG . . . has a tensile strength of 25,000 p.s.i. yet will not induce warpage on reasonably rigid structures. LIGHTWEIGHT . weighs only about half as much as an equivalent nylon and conventional dope finishing schemes. LONG-LASTING . never dries out or becomes brittle. 2. Heat-seal around edges with an electric iron. FUEL-PROOF (even against high nitro fuels) . . . MOISTURE-PROOF . . . FADE-PROOF . . . STAIN-PROOF .. . PERMANENT and DURABLE. PUNCTURE RESISTANT . . . many times the tear-strength and crash-resistance of silk or nylon and dope coverings. QUICKLY REPAIRABLE . . just press on a matching patch. Dents return to their original shape when heat is applied. POSITIVE BOND . . . bonds to frame or solid structures with proper heat application far better than the most effective dope job. Still ‘strippable’ for major repairs. ODOURLESS . . . no irritating smells, no dangerous fumes. TRIMMING . . . just cut out your own designs and press in place, then permanently bond with an iron. FOOL-PROOF . . . even when carelessly applied, heat re­ moves wrinkles and shrinks the covering drum-tight. ECONOMICAL . . . costs no more than an equivalent nylon 4. Trim is easily applied with separate pieces. covering finish . . . often much less. Replaces all other covering materials! NO MORE DOPING ... SANDING ... SEALING... POLISHING! IN SIX HIGH GLOSS COLOURS SHEETS 36" X 26" RED... YELLOW... W HITE... ORANGE... SILVER... BLACK price 25/ each AVAILABLE NOW AT YOUR MODEL SHOP!

In case of difficulty write RIPMAX MODELS & ACCESSORIES for details of nearest stockist 80 H IG H G A TE RD., LO N D O N N.W 5 Aero Modeller 340

INTRODUCTION of this covering * material at the Chicago Model Trade F air by Top Flite has seemingly taken the radio control world by storm. Certainly it has received the best press coverage ever known for any single subject and this alone bears out the validity o f Top Flitc's claims for the “ greatest advance in covering and finishing in model building history”. It is a Polyester film made from Poly­ ethylene Tcrethalate with heat sensitive coloured adhesive backing and supplied in sheets measuring 26 x 36 in. at 25 - each. Six brilliant colours offer adequate choice, each on paper backing and shipped in rolls to avoid creasing. Weight is equivalent to lightweight silk plus a "norm al” dosage o f After sheet is cut to shape and backing removed, wing is laid over tacky adhesive surface and gently pushed to make contact. MONOKOTE self adhesive and high gloss finish new coloured plastic

clear and coloured dopes, strength is infi­ nitely better than any other material in use and cost is very slightly higher than a top quality silk or nylon process. The latter aspect is however more than balanced by the facility of MonoKote appli­ cation. 'niere is no smell, no delay, decora­ tion is easier and the end product is better than the average modeller could ever

Lifted, with MonoKote attached, J in. overlaps are wrapped around. For curved top surface apply MonoKote down on to wing.

Using domestic iron set a t “ wool” , heat seal all wraps with gentle rolling action, start at centre, working to ends.

Set iron to “ rayon” and glide over the MonoKote. It heat shrinks quickly. Move iron to fresh area as colour change appears, wrinkles disappear and colour resumes original high gloss as reflection of Max Coote's face indi­ cates at right.

Top surface has similar treatment, only the overlaps are trimmed off as needed, at left. June, 1966

Dimple caused by hardest possible covering material finger-strike is re­ moved with fresh achieve in terms of gloss and fuel proofing. heat (above), note colour pat­ No grain fillers arc needed before appli­ tern “ under treat, cation so that in many cases one could ment” . At left: save weight with MonoKote. In fact, Dave only after great Platt's North American T-28 entry in scale effort we tore a section, adhesive at the British Nationals is covered with lifts top surface MonoKote, then painted over (it accepts of balsa. all finishes) in the correct scale colour scheme to avoid the heavy priming and fillers associated with cellulose surlacing. What, one might well ask after such glowing terms o f praise, could possibly be Patches are too any disadvantage with MonoKote? easy. Apply same material, heat seal Firstly in terms o f cost, the modeller with around to retain a shelf load of half filled dope cans, pre­ fuel proof protec­ served brushes and sundry lengths of le ft­ tion. A light­ weight portable over silk o r nylon w ill consider it expensive. iron is advised. Secondly, the material only suits the heavier type of model with rigid structure. It would be o f little use on an A /2 tailplanc unless (as we advised for Melinex covering) the construction is specifically designed for the purpose. Thirdly, a sharp compound curve such as an engine blister cowl or wheel spat of moulded material is difficult to cover without a series o f edges appearing. It is therefore most suitable for control-line or Odd pieces can be radio types and for this reason our test sub­ used for striping, cutting stars or ject was the Denight Special pylon racer emblems, race num­ kit by Sterling, built and covered by Tony bers, etc. No Dowdcswell. special technique needed fo r double Finished in red with black and while layers except for trim, the Denighl used three sheets and fully large areas. Max exploited the application of thin trim Coote demonstrates smoothing a red lines and leading edge wraps as can be seen stripe over white above. No problems arose at any stage. wing. later heat MonoKote is so different it calls for sealed and wiped pictorial explanation. Photos on these w ith cleanser. pages introduce the general stages, for more detailed description of the Denight decora­ tions, sec this month’s issue of Radio Control Models and Electronics. TOPICAL T W \STS by ‘Pylonius’ illustrated by ‘Sherry’

the whizz kids o f radio might have thrown a few gimmicky spanners into the workings o f conventional thought. For instance, automatic penetration fo r A lot of Tribe Single Channel models. Or is that, like so many of Whatever vicissitudes and problems may beset the the windblowm machines, far fetched? dark continent, at least its T.V. programmes have not yet suffered the Western fate ol being smothered Zombie & Son by old American movies; but no doubt Foxfam wall The fascinating thing about the model flying soon remedy this cultural deficiency. Meanwhile, hobby is the way its traditional styles of acro- youthful natives of Zambia are given the civilised nauting refuse to be overwhelmed by the slick privilege of watching a fortnightly programme on the appeal of the modern electronic machine. Anyone delights of model flying. Odd, though, to think of the thinking in the sort of progressive terms which sees old hobby enjoying an extension o f life in the a multi-storey block of flats on the non-functional emergent states. Satisfying in one way, but in another open space, might find it odd that the crinoline era I ’m a bit sorry to see the old gnu and hartebeeste rubber model should survive into an age singularly pushed off their stamping grounds in order to make lacking in clastic utility. He might also look askance way fo r six lane highways and ten channel radio at the prim itive antics required to elevate a goodness- models, but we all have to pay the price of progress. know's-why, motorless model to a viable altitude, In this country it is the rapid erosion of our available and would undoubtedly give a fat, .007 smirk at the flying territory, and I have no doubt that we shall idea of the term microfilm being applied to a type soon hear the same cry from A frica’s limitless acres, o f skeletal looking model. It might also occur to by which time we can be sure that the youth o f him that model flying is not just little brother Zambia w ill not be w-atching telly programmes o f tagging along in the wake of big brother. Aviation, model flyers cavorting over the grasslands, but look­ but has much to offer in its own right, although he ing at Gary Cooper adventuring over the vast empty may not be the kind to enjoy the diverse fun it spaces of yesteryear. gives to suit all pockets, air and otherwise. Apropos of this, a recent picture of a microfilm Swinging Scene model reminded me of my own attempts to pro­ The latest swinging thing in the fu ll size glider duce one o f these curious craft. It did not take me world is the super swing wing sailplane, with built long to realise that I suffered from a condition known as Fyffe finger, in which the thickness of the in thermal detector and everything for the nimbus hand deceives the eye. I also had the business of lover. The idea o f the swinging wing is to give a whispering friends to contend with, but this was of surge of rakish speed to get from dead spot to secondary consideration compared with the import­ uplift, and the only thing missing is the retro rocket, ance of skimming off a bath length of usable film. just in case . . . Whether the craft actually flew remains a mystery But what progressive equivalent have wc in the to this day, although somo theoretricians still aver model w'orld? We may have the electronics, but the that the distance achieved was due to the propulsive aerodynamics still remain way back in the “What’s influence o f an open window. cooking, Sir William Hayley?” period, in spite of A ll of which is part o f the rich pageant o f model all the inspiration we get from “ Thunderbirds” . flying, in the spirit of that continuity w'hich gives In the basic areas of the hobby we don’t expect anything very revolutionary, apart from the rotation newcomers to the hobby something o f those same joys of aeronauting that drove the Edwardian courting of the time honoured prop. For the Rubber and Gilder enthusiast an occasional change o f aerofoil couples off Wimbledon Common. i$ as much upheaval as his spacious, but not space, Just Gassing way o f life can stomach, but 1 should have thought Looking at the floods of vintage craft to be seen around these days I begin to wonder if the future "Says h it name’s Leonardo Da Vinci.” of acromodelling does not, in fact, lie in the fledgljng ast. A fter all, we each o f us have our own building oard time machine, and if tiring of today’s hectic compctetivc pace, wc can “Dr. Who” it back into a more leisurely ambience. Currently the time machines are settling down in the American “gassie” period of the mid thirties, and the huge, lugubrious craft now- wafting around the airfields give ample evidence o f the inflexible belief of those primitive times that a model w'as only kept right way up by the huge weight and bulk of the airwheels. We can also take it that the portliness o f the machines give a clue to the term “ gassie” , which must obviously be an abbreviation of “ gastronomic” . 343 June 1966 Silencers and Noise Part one of a series on advanced design silencers and tuned length exhaust pipes by: K. Lindsey, D. Balch and M. Larcombe.

'T H E need for silencers is becoming increasingly common in various purls o f the world und to date at least eight National bodies have adopted silencer rules, cither general as in G.B., or partial as in Sweden. Many modellers view the use o f silencers with some apprehension for a number o f reasons including ( I) resulting loss of power (2), unconvincing noise drop (3) engine overheating or dis­ torting, (4) complexity, thus high commercial cost (5) high weight penalty. These points were regarded as a challenge by the authors to prove that they were not intrinsic drawbacks o f model silencers. The num­ ber o f feasible design concepts is endless. Each agreed to follow different paths, a ll seeking to incorporate power improvement features into each system, but to get various devices actually operating they didn’t necessarily concentrate on all other features in every unit. The experiments could have gone on for half a decade (and probably will) but to get information into circulation fairly quickly the devices have been deliberately limited, f uture parts will explain the theory behind the present system as well as what it means in terms o f prob­ able silencer designs o f the future. Construction and performance Silencers and instruments used in testing by the three man details are provided here as a basis for future development. The tested team. Left to right, K.L.2. on Super Tigre G.20, K.L.3. on units can be broadly divided into two types. I, Pressure Pulse (e.g. M.V.V.S. 2.S RL diesel, M.L.l. on Eta IS. K.L.3. on C.15, tuned exhaust pipes). 2, Bernoulli (c.g. extractor venturi, sucking Smiths 0-S0,000 r.p.m. tachometer and the Dawe Sonometer. wing). For simplicity, silencers arc identified by the initials o f the inventor, c.g. Type D .B .l a Bernoulli-type made by Dave Batch. An endeavour was made to undertake all testing on quiet, windless days to make noise measurements easier. Noise was measured with the S.M.A.E.’s Dawc Sonometer on Range C—a delightfully casy-to-usc noise meter. Revs were measured with 0-20.000 and 0-50,000 Smiths Three stages in the construction of a K.L.2. silencer. Top, sheet Tachometers and a home made audio tachometer (which is preferable cones after forming and welding on a steel mandrel, w ith end when one thinks about trying to make contact with a spinner turning up pieces in foreground. Centre, left; cones butted together, centre; to 27,000 r.p.m.—the audio tachometer is used up to 6ft away). In welded, right; smoothed off. Below, threaded rod is used as a testing, the authors were helped by Paul Newell (S.M.A.E. Tech. Sec.) clamping jig to assure alignment during welding, note extension Dick McGladdcry, Richard King, and John Hodges. restrictor added to lower finished version. One very important consideration that must be borne in mind is that i f you walk round a ground-running motor with a noise meter at about 15ft, the noi&c level varies uboul 7 dB and the dB ranges in the tables (c.g. 78-85 till) show the maximum and minimum recorded around a motor. I f you walk round the same motor with a silencer fitted you obtain the same dB range, but the noisiest spots will not necessarily be in the same positions. For instance, on the long pure tuned exhaust pipes (K.L.2, and M .L.l), the noisiest place, with the silencers is atongsufe the pipe, not behind the engine and tail pipe which is the noisiest place without the silencer. To take a spot reading with and without the silencer is not good enough. One either has to move round the motor, or get the brave motor holder to execute a slow pirouette while the operator and the Dawc Sonometer stand s till! Most widely used o f the K. Lindsey types is K.L.3—a hybrid tuned exhaust which gives no power loss from 12,000 r.p.m. to at least 30,000 r .p.m. The prototype, used in an F. A.I. speed model on straight fuel and a 2 i year old G.20 motor otlkiully recorded 120 and 117 m.p.h. in 1965 speed meetings. This prototype K .L.3 was also used on the short lived, but spectacular E type “ Early B ird" combat model which clocked 102 m.p.h. (no streamer) on straight fuel and 7 x 6 frog Nylon propeller. The "Big-Daddy” K.L.3 is a pre-production model and favourable comments on its R/C performance have been voiced. Apparently it operates well at very low r.p.m. which is unexpected, as well as losing no power at all, at normal revs. K .I..3 lowers fuel con­ sumption by 10-20%. Pure tuned exhausts arc not so flexible. (4-5.000 useful range at speed revs)—but spectacular power rise with very good noise reduction is possible. The K.L.3 hybrid design should properly be called the M .L.-K.L.3 as Mike Larcombe was deeply involved in the concept. The M .L .l silencer, us sketched was designed for maximum efficiency at 16.000 r.p.m. and was manufactured from glass-fibre using the "lost-wax" technique to ensure a smooth internal finish. The con­ struction is not too difficult for those with access to a lathe, even a simple power d rill woodturning-type. Firstly mould candle wax over a piece o f J in diameter threaded steel rod and then machine the outside o f the wax to the internal silencer shape; this could be done by hand with a modelling knife. Paint the mould with one coat o f resin and leave until almost set. Then, using plenty o f resin, wrap on the glass- fibre. preferably the continuous filament type called roving or if unavailable use thin strips o f glass-fibre cloth. Wind this on in one direction working along the mould and then back again. Coat the outside with more resin and rotate slowly near a warm fire until the resin starts to harden. When the resin has set immerse the whole assembly in hot water to melt the wax out. Although the external finish may not be smooth the inside should be perfect A glass-fibre Y piece was also made using this technique so that an Oliver Manifold could be converted to a single i in. diameter outlet ready to accept the silencer. It should be emphasised that although glass-fibre construction eo Modeller Aero D a te S ile n c e r M o to r R.P.M. Noise (dB) Exhaust state. c o n d itio n s t y p e a n d f u e l figures and A ll manifolds Sealed with General silencer and manifold test data L o c a tio n w e ig h t p r o p e lle r d is ta n c e ’Plastic Padding* or ► ‘Bondapaste’ 9 1 66 " B ig - M e rc o 61 10.000 go-97 (at 15ft) Motor without manifold or d a d d y " s ile n c e r K .L .3 .

4 o zs. Straight fuel 10.000 84-88 (at 15ft) Motor + silencer + manlfolo C h a rv ille i Lane Tornado nylon N o’. 65-70 (flying Approx, noise + silencer 1 2 ' x 6 ' m easured at 150ft)

fre ezing O .S . large O .S . SO 11,250 102-96 (a t 15ft) Motor without silencer

Straight fuel 10.400 92-98 (a t 15ft) Motor + ailencer D.B.I. wing silencer on Tornado nylon 1 1 'a β ' 78-82 (fly in g at Approx, noise-f silencer Dave Batch’s Oliver 150ft) Tiger combat model. Note the extractor 2.1.66 Super Tlgre (Tests showed m anifold had no holes on the leading G 15 effect upon r.p.m .) edge. (See page 350.) Straight fuel Old Mill Farm 7 ' χβ' Frog 19,100 Not Motor + manifold n y lo n m easured

Chilly, damp K .L .1 . 18.500 Not Motor + manifold + silencer 1.3 ozs. m easured (3?ά r.p.m. loss)

7 ' x 3 ' Trucut 23.000 Not Motor + manifold m easured

24.000 Not Motor + manifold -I- silencer m easured (4 3% r.p.m. gain)

C u t dow n 24.900 Not Motor + manifold speed propel­ m easured ler Approx 5 ' x 7 ' 26.100 Not Motor + manifold + silencer

m easured (4.4% r.p.m. gain) 344 Test data for ETA 15D Mk 11 I 22.1.66 K .L .2. Super Tigre 23.300 95-99 (at 15ft) Motor + manifold

Old M ill Farm S tra ig h t fu e l 24.000 88-93 (at 15ft) Motor + manllold + silencer O a t · , c o n d itio n s P ro p e lle r R.P.M. N o is e d B Silencer, m anifold and silencer -f 1' long 3 16' bore tailpipe and location ty p e Chilly, damp Trucut 7' x 3' restrictor: highest dB reading alo n g sid e s ile n c e r 10,600 8ft Oliver manifold and Y piece to single tube 24.500 Not Motor + manllold +■ silencer + 1 m easured 1* long 3)16' bore tailpipe 0.1.66 f t ' 1 6' K.K. nylon 10.900 83 As above with olasstibre M.L.I. restrictor + one extra cylinder head gasket Below freezing Tornado thin hub 12,300 92 Oliver manifold and Y piece to single tube 24,100 N ot M o to r - f m a n ifo ld -r- s ile n c e r + Char.ilie Lane m easured 1' long 3718' bore talloipe 6 J ' x 8 ' 12.600 86 As above with glasslibre M.L.I. restrictor + extra gasket, i.e. .0175 thickness 20.1.66 14,300 Not measured Manifold Csinale f ' outlet) 24.700 Not Motor+- manifold + silencer+· Below freezing 14,900 Not measured As abovo. with cardboard M.L.2. m easured 2' long 3/18* bore tailpipe restrictor + extra gaskets, i.e B u s h y Park 8' * 4' Trucut 15.200 Not measured Manifold and glassflbre M .L.I. .0175 thickness shows r.p.m. gain of 6 % with 7' x 3 ' Trucut 15.300 Not measured Standard motor, no manifold at 23.000 (K .L.2 d e s ig n speed) Motor + manifold 22.1.66 14.200 87-91 Manifold sealed with Plastic Pad­ 22.1.66 K.LJ M o d ifie d 16.000 92-95 (a t 15ft) d in g M.V.V.S.2.5 15.900 85-88 (at 15ft) M o to r ·+ m a n ifo ld -f- s ile n c e r A verage M o to r w ith o u t m a n ifo ld o r temperature 14.600 Not measured As above, but with M .L.t. or M.L.2. Old Mill Farm M .L .I 15.900 92-95 (at 15ft) 40 F. dam p 1.4 o zs. s ile n c e r 78-84 Manifold and glassflbre M.L.1.. 4* b u t dam p 14.600 Glassfibre tuned exhaust + 4' 8" x 4 ' Trucut extension restrictor 8' x 4' Trucut 15.800 N ot m easured long metal tailpipe Old M ill Farm 88-94 Oliver collector 14.800 Motor without manifold or S eptem ber K .L.3 N e w G15 22.000 103 (ot 10ft) s ile n c e r 14.800 Not measured Oliver collector and Y piece 1965 Old M ill Farm 1.2 ozs. Motor +· manifold 4- silencer 15.200 78-84 A9 above and glassfibre M.L.1. with 7 ' x 3' Trucut 22,000 90 (a t 10ft) 4 ' extension restrictor Motor + silencer M ild S p in a flo Straight fuel 20.800 92 (a t 10(1) 15.100 Not measured Standard motor, no manifold. s ile n c e r 7 ' x 3 ' T ru c u t 2 o zs. 345 June 1966

IN N M TUBE 7/16· BORE 30 S.W.G TYPE K.L.3. , OUTER TUBE V « · BORE 30 S.W .G. (SMALL SIZE) REAR SEALING INNER TUBE PERFORATED WITH 36 - V32*HOLES 1/32- ALFIXING CONE. TURN OR FIU TENDING TO M ill M C « AT THE FRONT WASIIIR FROM ALUMINIUM

INNER AND OUTER TUBES PINNED AT SEAR WITH ONE U S.W .G. rACK THE GAP WITH FINE TEXTURE STEEL JOINTS AL.WELDED C« 3RAZED, WIRE PEG. WELD < * W OOL, PACKING IT TIGHTER AT THE BACK CR ARALDITED WITH ARALDITE ‘ AT 1" 0« AJtAlDITE SO THAT THERE IS VERY OBVIOUS BACK •AUl’ l f POSS.(SOLID, HO T-SLIIING 1YFE ) PRESSURE WHEN ONE BLOWS DOWN IT. C« ORDINARY 2-1J U PACK TYPE SET AT UP TO 100 C. is adequate for diesel motors it should not be used with glo-motors; within 10 seconds on a Super Tigre G.15 the glass-fibre silencer Above right: Dave Balch venturi silencer produced a large resembled Plasticine due to the extremely high exhaust temperatures. amount of drag when mounted in the outer position due to Any o f the silencer types in this article could be made by this ‘Most funnelling effect of the air between fuselage and venturi. Part wax" method with a degree ofingenuity. buried position w ill help to alleviate this. A number o f double-cone tuned-length silencers have been made using an extremely simple method that is well within the capabilities o f even the most inexperienced modeller (to refute certain well- published views by free flight men). The complete silencer is made from thin cardboard rolled into two cones held together with P.V.A. glue and fuel-proofed inside and out. Admittedly these will not stand rough use but they are so easy to make that large numbers could be stocked especially as rcplacablc versions fo r combat or free flight flying. The M.L.2 silencer mentioned on the test data was made from cardboard to the dimensions shown and has survived a fair amount of test work without damage. To become an efficient acoustic silencer the cardboard really needs some form o f external lagging Such as thin felt cemented in place. Tests on the D.B. Venturi silencer have given interesting results as follows, in Dave’s Trident II Oliver Tiger powered F.A.I. team racer, using a 7 x 8 Rev-up propeller. The Venturi silencer was quieter on the ground than the normal unit but was about the same in the air. Venturi size was I in dia. inlet 0.45 in. dia throat l. l in. dia outlet, 6 in. long with 8- fa in. dia extractor holes. The Venturi was evidently working quite well, for the in-flight R.P.M. build up was more. However the model speed with the Venturi attached was 83 m.p.h. whereas with the normal silencer and no Venturi the speed was 88 m.p.h. This speed difference was purely due to drag. This was shown by a quick check with the silencer dis­ connected from the expansion chamber assembly, but still attached to the model; under these conditions the speed was only 82 m.p.h. A quick drag analysis on the model showed wliere most o f the trouble was coming from. TEST DATA FOR BAI.CH VENTURI .SILENCER D.B.4.

Oliver τ expansion chamber 11.500 R.P.M. static + venturi extractor. 13.200 R.P.M. in flight. Oliver & Collector ring 11.700 R.P.M. static. Silencer 13,100 R.P.M. in flight. M.L.1. GLASS FIBRE ALURNAllVE 1/4" O.D. V I6* I.D. SILENCER EXTENSION RESTRICTOR ^ 4 ' MAXIMUM INSIDE DIA. Venturi Silencer gives 1,700 R.P.M. build up in flight. 1 | / 4 · CM A. EXHAUST ...... i_iLμ i JiMW.i.jin __ l______Ring Silencer gives ; 1.400 R.P.M. build up in flight. INLET " 1 ίΐλϊάύΙΡ · * Τ ί/2 \ l— ------7 .1 /2*------I * - I ------4 " ------The Venturi was uttuchcd to an existing model and so was mounted in the most convenient fashion on the side o f the fuselage. Un­ fortunately the funnelling effect o f the air between the Venturi and the fuselage caused a large blockage, and this was the main cause o f the drag. If the side o f the fuselage had been cut away to accommodate one M .L.2. CARDBOARD I.V B " INSIDE DIA side o f the Venturi completely then far less drag would have been SILENCER 1 1/4* DIA.EXHA created. Alternatively i f the Venturi was mounted further away from the fuselage as on the commercial ETA units this would also help - · reduce drag. Naturally on models that do not have cowled engines this drag problem w ill not arise and the full power advantage can be used. -12.1/2". The Venturi itself wiH naturally have some drag but in most appli­ cations the power increase w ill more than offset this aerodynamic loss.

TAIL PIPE CONE SECTIONS. ROLL FROM 20 S .W .G . SHEET ALUMINIUM ON£ INCH yio* i.d. SMOOTH RADIUS AROUND TURNEO OR CARVED STRAIGHT TAPER FORMERS ON REAR RESTRICTOR 2‘ LONG

Continued on page 350 Aero Modeller 346 THREE EASTER MEETINGS

Czechoslovakian unrestricted N.W. Area Two Day Meeting international speed meeting winner Rolf Miebach (West Bristol Goodyear Racer Meeting Germany) fills his 137.9 m.p.h. "Stuppi” design, at left. J. Lenzen, and E. Rumpel, right. Czechoslovakian Unrestricted W ith 12 entries from Czecho­ slovakia, W. Germany and International Austria. J. Sladky placed 2nd w ith 132.4 m.p.h. and J. Frohlich (W. Germany) 3rd with 130.5 m.p.h. third. Bill Sheppard (Rhyl) would have been placed higher but his second flight let him down due to engine cutting troubles. Control line events held on Sunday included Aerobatics. Combat heats, IA , and It team racing. Aerobatics with 10 entries were cleaned up by Tom Jolley (W liitcfield) on his usual good form with a comfortable margin over second place Harold Dowbcrkin (Harwich) though he did have a short engine run and consequently had to rush the last few manoeuvres. Harold Dowbcrkin showed a lack of practice with a bumpy llight over- correcting corners etc. M ick Reeves (Wanstead) was also out of practice and his first llight model rocked a lot on the lines after pulling out from a manoeuvre. His new 56 in. span. Red. Black and W hite, Merco 61 powered semi-scale racer type stuntcr was used for the second flight but this also seemed rather shaky. Plenty of newcomers were in the lower results notable; T. Taylor, S. Blade, and B. Λ. Lister. As a side line Geoff Higgs the judge flew his DeHolt "‘Stuntwagon" constructed from an IS year old kit. With a Merco .61 and weighing 4 lb.. it’s reported to extend the flying arm at least 6 inches }A Team Racing was well supported with 49 entries blit the usual names came through to the final with a junior Fcltham/ Hayes team the only bright new sparks. In the heats some excitement was caused when a free flight model hooked onto l.cs Davy's lines and was towed around for three laps, causing a rc-iun plus a degree of mixed feelings. A ll semi-final times were below 5 minutes and a fly off had to be held between the two tied third place teams, notably Smith,1'Brow n (Fcltham Hayes) and Turner/Hughes (Wharfcdalc) who had both made 4:29.5. This resulted in Sm ith/Biown beating Turner Hughes by 5 seconds with 4· 11 The final saw Place/Haworth win with 8:54.5 chased by Sm ith'Brown with 9:02.5, Davy/HuJson retired at 163 laps with the engine coming out. B I cum Ram ie with 13 entries had three teams break lines Batch King (Fcltham Hayes) recorded the fastest heat at 5:46.2 Above: all enveloping canopy on a Bugl powered Austrian team with a ‘Super Trident” , powered by Fta 29 with Merco silencer racer. Team Racing had four nations competing, Czechoslovakia, that completed 40 laps at 107 m p.h.. second fastest was A. Dell W. Germany, Austria and Hungary. Fastest heat went to using an over-size Oliver Tiger with enclosed and rearward Markotai/ Mohai (Hungary) with 4:22, next was Mousburger/ facing silencer. In the final. Balch King were the fastest and Fischer (Austria) with 4:29. The final gave Drazek/Tmka a well in the lead at the halfway mark, then the model caught win with 9:19 over Markotai/Mohai with 9:34. an accumulator line and ran-in, breaking the propeller. Hard- castle S kill (Wolves) covered 69 laps on one tank hut had to change a propeller In the meantime, Alan Dell was droning N.W. Area Two Day Meeting on with the oversize Oliver diesel mode! to win by 25.3 seconds with 8:50 over Mardcastlc Skill in second place. Held during Faster, the North Western Area S M .A.F SUNDAY with its very cold and overcast weather featured meeting at R A F. Tern H ill. Salop was one o f the best yet, F .A .I. Team Raring .is the premier event, and this attracted no even when taking into consideration the two rival attractions less than 57 entries. Unfortunately only 27 flew and of those. elsewhere for free flight and radio. Sunday dawned with ideal 24 recorded times. Several complaints against the organisers warm flying conditions and plenty o f spectators were on hand were heard, but complainants should remember how few people tu enjoy the model flving. trade shows, and refreshments w ill devote time to organising, when they could be flying instead The Premier Event tor Sunday was M ulti Channel F .A .I. Several heats were flown four up and one particularly idiotic Radio Control to the latest schedule, attracting 19 entries Lack pilot who shall remain nameless was whipping the model up to of practice with the new manoeuvres showed nearly all the lime, half a lap ahead, endangering all the other models by over­ only one flight being over lime irt the first round. Round two lapping THREE sets of lines at one time to overtake He should produced no less than five overtime flights (!). also, judging have been grouded at the first stop, but unfortunately this was was found rather hard for the rolling circle as most pilots did not done and three teams had to suffer. Fastest heat went to not start and finish in 'he same place. P. Newitt (LARCAS) Place.· Haworth w ith 4:38.8 backed up by 4:49.8. Davy,'Hudson made highest score in Rd. I hut crashed in Rd. 2. after making were really out o f luck. A fter crashing in the last heat a new almost perfect stall turns and a good tailslidc. B. Purslow front housing was put on the Fta . . and a new model found (LARCAS) the eventual winner made a splendid second flight for the final, after a first round 4:53.7 qualifier to put them in w ith very good rolling circle and ton hat manoeuvres. His third slot for tlic final. Turner/Hughes, last year’s winners maroon model has a gigantic fin. uses Orbit »0. Merco 61. and returned 4:41.2. Only the three finalists recorded times under a Gee Dee Pike silencer T. Cooper (1 ARCAS) was doing very 5 minutes. The final was eventful. Turner’s propeller came loose, well and scoring high 8 and 9 marks all the time " ith his the engine would not start, then he went off to a "p o p p y" run Rcmcon 12 Tx and home made Rx. Super Tigre 56 powered Place droned on at 88 m.p.h. then nosed the model over at a model but had his engine cut on the last night K J:>nes stop. Turner dashed actoss and lent him a propeller, after a (Tamworlh) flew an own design ‘"Buccaneer” with foam wings long stop he was up again then Davy was down to retire at and glass fibre cowl to third place using Citizenship radio, but 133 laps. T urn e r‘Hughes emerged the victors at 11:19.2 with it wemed underpowered. Free Style Radio held on the cold Place/Haworth second at 11:36.2 Monday attracted 22 entries I). Hammant (Grimsby) took the Combat with 1 17 entries was fu ll of new faces. and the "old top spot from Λ. Whittaker (LARCAS) after a first nlacc tic hands" seem to be having a rough time these days. H ie standard vs iIII 130 points. Three minutes air time to make tnc most οί flying in the final was exceptional between D. LcaJbcatcr "touch and goes" was used to solve the situation with D (Bedford) and S. Crawford o f M.C.C.. (no not the cricket team Hammant making 7 using his 0.1). model incorporating a but a branch of W hitcficld M A C ! ) Both flew Oliver Tiger Nimbus wing and Kraft KP6 proportional gear. A. Whittaker powered "n o m in a to rs", that survived the ordeal to give D. made -1 but clipped the propeller and stopped his engine. I) Leadbeater a win with +18 points to nil from S Crawford Platt (Wanstead) did triangles ami square loops, to ^cl a good Control Line .Scale was very close, only one point M paralu g performance from his O S. 50 powered "Kingpin . placing first and second places. Tony Day (Birmingham) took first place . > i

1, Bill Forrester (Wan- stead) 2nd in C/L Sea e with Fokker El 11 Eindekker. 2, Combat finalists: left, S. Craw­ ford (M.C.C.), and right, winner D. Lead- beator (Bedford); both flew O. Tiger “ Early Birds” . 3, Veronica Sissons holds winning Place / Howarth ‘. A T/R. 4, G. Hiller (W. Coventry) and wife with 3 "Moonraker” F.A.I. models. 5, John Bailey (B ristol) ;A power winner seen fly­ ing in open. 6, Pete Brannigan (Ex “ Blue­ print” now “ The Mes­ sage” ) with decorated model. 7, D. Hammant (Grimsby) with 2nd place F.A.I. and 1st F/Style R/C. 8. Two of Pete Bay ram's Chuck Gliders. 9, A. Brock le- hurst (Halifax) with 2nd place glider. 10. Harold Dowbekin (Hor- wich) holds O.S. 35 Stuntcr. 11, A. Whit­ taker with Kwik Fli 2nd. F/Style R/C. 12, B. Day (C.M.) with­ draws winding tube prior to fly off. Aero Modeller 348

with his, by now, very well-known “ Fokkcr L)7" that flew in (Birmingham) 583. 2. W. Forrester (Wanstead) 582. 3. D. Platt its usual faultless manner to total 583 points. Bill Forrester (W anstead) 565. C O M B A T . 1. D. Leadbeater (Bedford) +18. (Wanstead), in his fust contest had a magnificent "Fokker K ill 2. S. Crawford (M.C.C.) 0. 3. Melrose (Heanor). 3. Ledger Eindekker" that scored mostly 10*s and 9's in (he static judging (prior to the flying) but lost some on the overall colour, by far (Heanor). F A I T / R . 1. Turner/Hughes (W harfedale) 11:19.2. the heaviest points loss came in flying when the nose weight fell 2. Place/Haworth (Wharfedale) 11:36.2.3. Davy/Hudson (Wharfe­ out. making it super-sensitive. Dave Platt (Wanstead) flew a dale) Rtd. 133 laps. R U B B E R . 1. R. Lennox (Birmingham) +4:24. “ Miles M agistcr" to third place but wrecked it during some 2. B. Day (C.M.) +3:35.3. D. Morley (Lincoln) +3:16. G L ID E R . acrobatics in an attempt to gain flying points. 1. P. Foster (Timperley) 9:00. 2. A. Brocklehurst (Halifax) Free Flight Seale only had one entry and after discussion the 8:57. 3. Moore (W est Coventry) 8:50. T A I L L E S S . 1. K. Attiw ell event was run with two stand-in entries hurriedly sought (York) 6:11. 2. J. Pool (York) 5:25. 3. D. C ulpin (R. Royce) out on the field by the winner, to save a wasted trip! J. Palmer '(C.M.) won with 518 points flying a "Sopwith Trip lane" based 4:26. F/F SCALE. 1. J. Palmer (C.M.) 518. 2. G. Lewis (Spitfires) on an A.P.S. plan. 380. 3. E. Clutton (Spitfires) 377.

Free Flight Reported by John O'Donnell Sunday's simultaneous staging of both open and jA power Bristol Goodyear Meeting seemed a little strange. It would have seemed more logical to Eighteen of the original 53 entries originally received for have held them on separate days. jA seems to have declined Bristol K ( M.A.< Pj..... Race Rally arrived t<> fly in the even more than open with the advent o f silencers—although chilly, damp conditions of April Nth. interest would appear to have suffered more than performance. When racing began at R A F. Hullavington. models were T he home-made ■‘silencer” is now relatively commonplace especi­ flown in heats o f four aircratt. released at five second intervals ally as it is usually less performance reducing than a commercial and raced around a 10-lap 2 4 -mile course against the clock equivalent. Some of the heats presented magnificent spectator appeal as file pleasant weather might well have been expected to pro­ closely matched models flew tight courses around the pylons duce high scores. Instead it produced much erratic flying as Most successful with this technique was Peter Waters, flying a models warped in the warm sun and humid air. There were Min-X Astromite VI equipped, O.S. powered Shoelace, to many instances of models changing trim between one flight and record the fastest time of the day. Fastest model of all tile next. Even prize winners were not immune to this trouble appeared to he G. Warren's U V Knarf, but unfortunately he as some bad to check-fly between official flights. The lift was flew a rather wider course around the pylon, and it was I). very weak and patchy—nothing like what one would have Brunt, of LARCAS, with Cosmic Wind who recorded the expected— althought downdraughts were plentiful enough. fastest time. Third was B. Purslow, another I ARCAS member, Only three trebles were managed between the two power also flying a Cosmic Wind. events. The open fly-off was held in fairly liftless conditions Although the winner used proportional equipment, many with the wind, by then, blowing onto downwind hangars and competitors were using non-proportional systems and it is quite buildings. In the event this did not matter as the models of clear that, unlike the acrobatic schedule, pylon racing gives the winner Trevor Payne and runner-up Ray Monks landed in front non-proportional radio systems a far better chance against pro­ of the obstructions. Both featured Cox TD15 motors with home­ portional equipped models. made silencers. Third place, just short of a treble, was taken Results: 1. P. Ί . Waters (Porthcawl) 3:38 Shoelace; 2. D by Brian Hooley (recently returned to "the fo ld ” after several Brunt (I ARCAS) 3:53 Cosmic Wind; 3. H Purslow (LARCAS) years’ absence) using a P A W. 19 diesel. 3:54 Cosmic Wind; 4. G. Warren (Reading.) 4:03 I.W Knarf; ±A Power was won by John Bailey with a treble—although 5, R. Yates (Eastcotc) 4:12 Aeolus: 6. R. Gardner (Blctchlcy) he couldn't manage to repeat this score with the same model 4:12 Cosmic Wind. in open. I was second with a downdraught and two maxs—and then spent the rest o f the day anxiously watching Ray Monks Below: “ LiP Knarf” by G. Warren (Reading) used F. & M. who had two initial maxs but who developed trim trouble before Digital 5 proportional radio with O.S. .40 power. Probably the (and on) his final flight. fastest model at the meeting, it finished 4th. Chuck glider saw general satisfaction with the “ best three of nine flights” rule Top two scores were very close with Roy Roberts just edging out Peter Bayram. Both managed at least one long thermal flight outside the contest—Roy's being around six minutes The following day was far from pleasant—being overcast all day and bitterly cold in the morning. Nevertheless, lift was remarkably plentiful although few glider fliers could find it consistently. There was only one treble—by Peter Foster flying in his first contest. His model was of hybrid design with Bagulc.v style surfaces on one of my style fuselages. The use of a thick- wall fibreglass rod resulted in a very overweight (20 odd ounces) A/2. Following scores by Alan Brocklcnurst and Moore were very close. Rubber flying was not very impressive with only five reaching the fly-off. This was held in cold sinking air as the scores indicate. W inner was Reg Lennox who flew some time after the rest—and in rather lighter conditions. Brian Day and Deri Morlcy were the only others to clear three minutes Tail-less was a mixture o f rubber and glider, now a little more equal by virtue of a 250 ft. towline being allowed. Even so. Ken Actiwell and John Pool collected the top two positions, flying rubber Third, however, was Derek Culpin s glider although his clubmate might have overtaken him if a long second flight could have been retrieved in time. The large selection o f prizes were presented by Group Captain F. \V. Deacon. D.S.O.. D.F.C.. A.F'.C.. R A T . Commanding Officer R A F. Tern H ill, to conclude another successful two-day Faster meeting.

Results:- MULTI FAI R.C. 1. B. Purslow (Larcas) 4016.2. D. Hammant (Grimsby) 3676. 3. K. Jones (Tamworth) 3569. C L . S T U N T , 1. T. Jolley (W hitetield) 1555.2. M. Dowbekin (Horwich) 1495.3. M. Reeves (W anstead) 1445. B . T E A M R A C E , 1. A. Dell (Feltham) 8:50. 2. Skilt/Hardcastle (W olves) 9:15.3. 3. Balch/ King (Feltham) 10:29.9. 4A TEAM RACE. 1. Place/Haworlli (W harfedale) 8:54.4. 2. Sm ith/Jones (Feltham) 9:02.5. 3. Davy/ H udson(W harfedale) Rtd, 163 laps P O W E R . 1, T , Payne(North- ampton) -1-3:14. 2. R. Monks (Birmingham ) -( 2:54. 3. B. Hooley (B A C —W arton) 8:50. jA P O W E R . 1. J. Bailey (Bristol) 9:00. 2. J. O'Donnell (Whitefield) 8:18. 3. R. Monks (Birmingham) 8:14. CHUCK GLIDER. 1. R. Roberts (W hitefield) 3:39. 2. P. Bayram (Lincoln) 3:37. 3. D. Brown (Potteries) 2:2t. F R E E STYLE R.C. 1.D.Hammant(Grimsby)130(flyoff).2. A.Whittaker (Larcas) 130.3. D. Platt (W anstead) 108. C /L S C A L E . 1. A. Day 349 June, 1966

Fylde Radio Controlled Model Society from Lancashire are now 40 strong and meet in the Y.M.C.A. building, St. Annes. A ll classes of models are flown including multi, proportional, single and scale. They also have some boating interests. (Photo: "Blackpool Gazette and Herald” ).

SCOTTISH NEWS SLOPE SOARING IN YORKSHIRE This year's annual event for the Cale­ From Northern Area News we learn details o f their first slope soaring meeting to hc donia Shield was held on March 27th. in organised by Blackburn Aircraft M.F.C. and held at Black Hamblcton Hill, the neighbourhood o f Greenock, free commencing at 11 a.m. on June 26th. The site allows for soaring in any wind flight being held on a moor in the vicinity direction except South Hast from 1.300 feet altitude. Black Hamblcton H ill is situated oi Loch Thom and control line on the about 3 miles South Hast of Osmotherley, on the North Yorkshire Moors. Open for grounds of the l.B .M . factory. Free flight entry by S.M .A.E. members only, the classes are Free Flight Glider, Magnet .Steering established itself to leeward of a large and Single Channel Radio Control glider. Eric Coates and Graham Freestone both hillock and had control line men throw­ contribute to the latest N.A. News with slope soaring hints and model plans. ing kit models up in an effort to get some extra club points, one or two models went O.O.S., but judging by the Worthing Bald Eagles number of totals tinder 30 seconds, a lot COPTHORNE M.F.C. did not go far. )A team racing was well Contest Flying supported and well silenced, but F A. I. Copthornc M .F.C reveal themselves A t the latest South Eastern Area had to be flown on short lines after one as the "Associated C lu b " of Coventry S. M.A .E . control line meeting held at the bisected itself on one o f the lamp stan­ & D .M .A.C . mentioned last month in Elliott Automation ground. Rochester, on dards around the car park flying site. "Club and Contest News" under "Out­ A p ril 3rd, weather conditions were the Combat was a bit bogged down, literally, doors and Indoors". Copthornc M.F.C. normal, wet, windy and really cold. leaving the factory lawn very chewed up. was formed 2 } years ago from a model Combat was won by Worthing Bald Clasgaw Hornets emerged the winners fo r Railway Club o f all things, NO they Eagles chairman John Bashford with the third year running followed by Fcuric don't fly HO team racers! Also they T. Clarke flying a large stunter in his Reekie I Jmbtirgh) and Larkhall Orbitcrs. don’t intend to give their flying site up first competitive flight, giving him a con­ The previous weekend, and further down to Coventry &. I) M .A.C. Two flying vincing win over the other area stunt the Clyde coast at Gails saw the Radio displays were given last season and experts. Control men competing in the rally run meetings are still held twice a week. The by Irvine M .A.C. and sponsored by the only radio job they fly has just been S.A.A. This created a lot o f interest but lost O.O.S., this being an O.S. Pet ESHER very little flying. Most impressive model, powered silver A P S. "Pal Joey” with a both there and when demonstrated to the Minimac Rx. Any interested locals (especi­ Team Race Meeting l.B .M . factory during the Caledonia ally any who may have found the The Esher M .F.C ., F.A .I. Team Race Shield was Ian Dunn’s (Perth) low wing P-J) should contact M r. R. P. Smith. took place at the Club’s Fairmile Com­ dee String with Digifivc gear and Spinaflo Coplhorne M.F.C., Copthornc School. mon circle on Sunday, 3rd A pril, under silenced Mcrco 61. Kercsley, Coventry. overcast skies, with light winds. The meeting was well supported w ith partic­ ularly large numbers from Chingford. Wanstead and Hayes clubs contributing to the total entry of 21. The meeting was held in two heats each of 100 laps, the three fastest teams going on to the 200 lap Final. The Balch/King team from Hayes, Fcltham provided an object lesson for many with a time of 4.52.5 from their second-string model! Goddard Gillhcspcy from St. Albans were the next fastest with 5.15. The Final had to be re-run, due to a ll three finalists breaking F .A .I. rules; however the final results were— Balch/King (Haycs/Fcltham) 10.05.5. Goddard/ Gillhcspcy (St. Albans) 12.04.5, Attwell (C hingford) retired 162 laps. Northwooid Clubstcrs admire fellow club member’s models at the Northwood parents and friends invitational night on April 7th. A wide selection of models reflected the club’s varied interests. Aero Modeller 350

EVENTS THIS MONTH COMING EVENTS May 29 & 30 S.M .A.E. British National Championships. R.A.F. Hullavinglon Additional to last Month’s announcement. W iltshire, on A429 between Malmesbury and Chippenham. May 29 Sunday ovonls. Open Rubber (M .A. Trophy). Open Power (Shelley Trophy), R'C Multi (S.M.A.C. Trophy), R/C Scale J u ly 3 Esher intermediate R lC Contest Shuttlewodh Co'lection Airfield. Qualifying Flights. C L Scale Qualifying Flights (Knokke Trophy) Old Warden, Nr. Biggleswade. Beds. II a m. 5i- Pre-entry, to: - Team Race Class A (Davies A), Combat (heats) C/L Speed M Ever Oil. 'Heyst" Coldhnrhour Rond. Pyrford, Waking, Handicap, plus one unorthodox event. May 30 Monday Events. Surrey, by July 1st. Note admission 316(1. to Airfield, also in­ Open Glider (Thurston Cup). Combined R/G/P. (Womens Cup), cludes car parking, access to museum and collection. R C Mult. (S.M.A.E. Trophy). RC Scale Judging. C/L Scale July 17 I9G6 DevOtl FlF Championships. Woodbury Common, R''G. P Only Judging, Team Race Class ’,A (R.A.F.M.A. A . Trophy). Stunt Open to competitors normally resident in Devon. Details from (Gold Trophy), Combat (Finals). D. G. Baudot,aO.Moorlicid Road. Withycombe, Errnoulh. J u n e S SI. Albans Gaia. Chobham Common, Surrey. Open R/G/P, A/1 J u ly 17 East Midland Speed and Com bit Open Meeting. R A F Barkston Glider and Coupe d'Hiver. Hoath A ll classes soeed. special prize for percentage of reco-d June 12 fast Anglian Area Decentralised f A t. Contest. Postal, F.A.I. flights Class "A ” combat. Entry 3'- per class in speed. Combat Powe·. Wakefteld and A 2 Glider. No rounds. One entry in each 3M o G. Farnsworth, 29. Balaclava Road, Sheffield. 6 by June class Full S.M A E. members only 2/6d pre-entry, late entry 5 - 30th. S.M.A.E. Insurance Roo d with results. Results must be in h, June ?0th to:— S. Bowles, J u ly 31 Woodford Rally. Avro Airfield. Woodford. Cheshire. Open Warren Edge. Brandon Road. Thetlord. Norfolk. R.'G P. combined tailess R G P. Chuck Glider. F F Scale. Com ­ J u n e 12 West Mendip M .A.C Slope Soaring Rally. Crooks Peak. Nr. bined F.A.I. R/G.iP, Class A Combat. F.A.I. and (A Team Race. Weeton-Supor-Maro. Single and Multi R/C. Details Irom:— Rat Race. C.'L Scale, R.'C M ulti Stunt. R/G Goodyear Pylon Race. P. Heeley. Catcopp, Station Road, St. Georges. Weston-Super- A u g u s t 7 Hayes Free Flight Gala. Chobham Common. Surrey. Open R G'P M are. Open combined R.’G'PvTailless (30 secs E.R.) and A 1 Glider. J u n e 12 Croydon D.M. A C . Gsfa Chobham Common. Open R/G'P. A u g u s t 21 East Anglian Area Open Meeting R A F. Up wood. Open R.'G. P, J u n e 12 Dunfermline Control Line Rally. Pitreavie, Nr. Dunfermline, Combined F.A.I.and Coupe d'Hiver. Rat Race. Combat, Stunt and Chuck Glider. Pre-entry to: September 4 Bosccmte Sport Rally Everlelgh Dropping Zone, Nr. Tldworth. Ounlermline M A C . 2 Macgregor's Buildings, Woodmlll W ilts. Concours d‘ Elegance and Scale. Sinole channel R C Street. Duntermllnc·. lime nomination Spot Landing, and Chuck Glider. Field entry. J u n e 19 Elliott M .E.C . Rally. Airport Works. Rochester. Kent, Rat Racing S e p te m b e r 25 Northern Area Meeting. R.A F Topclifte. Tony Pannett Memorial (all classes). Stunt and Combat. Trophy lor Open Power. Vintage. Coupe d'Hiver and Α .Ί Girder.. J u n e 19 Bath festival Radio Contest R A F. Colerne, Nr. Bath on A4 Details from :- J. Moseley, 1, Elmwood Avn . Walton, W okoflcld\ Scale and Concours de elegance. S.M.A.E. rules. F.A.I. Multi O c to b e r 2 Canterbury Pilgrims Gaia Club field. Barham Nr Canterbury/ Aerobatics. Pylon Racing N.W.P.A. rules. £195 prize money. Kent. Open R/G/P single channel R.'C Spot Landing and Con­ Pie-entry by 4.6.66 to:—Dr. G. Henley. 47 Pembroke Road, c o u rs d 'E le g a n c e . S ta rts 10 a.m . Cl'fton, Bristol 8. O c to b e r 23 bill N. Area F.A .I. Meeting. R.A.F. TopcIlUo. Yorks. F.A.I. R.'G.P. J u n e 19 S M .A E Indoor Team Trials. R.A.F. Cardlngton. Beds. Team Race Combat, Stunt, Scale, Details from:—J. Moseley, J u n e 26 Northern A/ea Slope Sotrino Meeting. Black Hambleton Hill, 7. Elmwood Avenue, Walton, Wakefield. between Hawnby. Thirsk and Northallerton. Free Flight liand launch, Magnet Steering hand launch and Single Channel Radio Control time Nomination,Spot Landing contest. Details from :— E Coates. 37 Knedlington Road. Ho.vden, Goole. Yorks. J u n e 26 S.M .A.E. International Control tine Team Trials. R.A.F. Swin- S.M.A.E. CONTEST RESULTS derby. Official ore-entries only. Team Racing. Speed. Aero­ b a tic s and S em e J u n e 25 M ad m a cs M ee tin g Pitreavie, Nr. Dunfermline. Combat and Team 27th MARCH Racing. Pre-entry to:—J. Ounkcr, Kirklands Garage, Kinross. Kinross-shire. F.A.I. Glider K & M.A.A. Cup. (21 entries). 1. J. Allen J u n e 26 Deton Rally Woodbury Common. Nr. Exmouth. Open R/G/P. (Brighton) 2:20. 2, C. Foss (Brighton) 2:17. 3, J. Edwards (Croy­ and C h uck G lid e r e n try 2/Gd o n fie ld . don) 1:39. Open Power, Frog Senior Cup (9 entries) 1, A. M oss (W hitefield) 1:23. 2, T. Payne (Northampton) 0:57. 3, A . C hilds (Brighton)0:08. Open RubberOS entries) 1, H. Tubbs (Baildon) GOLDEN WINGS CLUB QUIZ 4:17. 2, J. O’Donnell (Whitefield) 4:01. 3. W. Horton (Crawley) ANSWERS 0:47. Coupe d'Hiver(11 entries) 1, P. Cameron (Crawley) 2:55 2, A. Crisp (Croydon) 0:51. 3. M. Brown (Maidenhead) 0:20. 1. (b) (lying-wings Pluggc Points. (One Event) 1, Brighton 185, 2. Croydon 86, 2. (c) a control-line system 3. St. Albans 51, 3. Whitefield 51. 3. Solarbo, Veron, Mercury, Kcilkratt We apologise to the tree flight competitors who attended the 4. (b) radio frequency in M/cs S.M.A.E. Area Centralised meetings on March 27th and April 5. (d) gliders 17th with the wrong models, due to our error of mixing the 6. D-C Bantam, A-M 049, E.D. Bee, Frog 150 events in the Contest Calendar.

Silencers and Noise EXPANSION PLATE CHAMBER (MAY BE DOTH ENDS i'l : -■ FILLED WITH Continued front page 345 o f FLIGHT 4 ^ TEST DATA FOR D.B.I. WING SILENCER

In F lig h t S p e e d s S ile n c e r E n g in e M o d e l a s a In f lig h t R e m a rk s T y p e N o is e S p e e d p e rc e n ­ R.P.M. a t 50 le e t (M.P.H.) ta g e

O live r 83 65.3 100 12,300 Manifold alone WHOLE WING m a n ifo ld as often used SET A l INCIDENCE in c o m b a t. RELATIVE TO ENGINE EXHAUST Oliver manifold 76 03.4 97.1 11.900 Worthwhile t expansion but at expense cham ber o f R .P .M . ROWS O f VERY 5101 IN and S peed. SMALL O N TOP SURFACE ONLY. Oliver manilold 73 67.8 103.8 17.4W Considerable FND f : In c re a s e d . W IN G Oliver manifold 82 58.2 89.1 12.200 W ith silencer PETACHA&U SILEN C ER S — suction wing unsealed, END PLATES D .B.I. & 2 sile n c e r- considerable APPROX i " unsealed (Top drag penalty. ABOVE end p late SURFACE OF re m o ved ). WING. 3AFFLE HOLES IN VERTICAL Te*U utilised Oliver T.qcr flying wing combat model, with a K.K. 8 x 6 nylon prop SPARS (23.1.66 at Charvillo Lane). For comparative noise level, Chinoford M.A.C. F.A .I. T.'R. Eta 15 and silencer with bored out suction holes:— 80dB al 52' model speed 0 .8 . I AND 0.B.2 WEUHO FROM 23 SWG ALUMINIUM —60 m .p .h . WING CHORD 3 ", SPAN 2*. 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Mr. Morrissey, 17, Ardgowan Chester Road. Macclesfield multi cyl , America · Points for Keil K6. Pre 1940 Model Road, Cotford S.E. 6. REBORES. DIESEL ENGINES. 21,'- C .w .O . G L O W - Airplane News. Books. Photos Fighter and Racing PLUG ENGINES trom 30 C .w .O . C.O.D. SERVICE Planes. A. Van Wymersch. 1280 Shaw Place. Sealoro. (pay the postman, UK only) 4/6 extra. A ll engines New York, U S A Π783. Unllown C W Macgrcgor T i and Rx case, aerial, tested and returned (post tree In UK) within three onttenes £7; Rx only £3 O.C. Sabre. M E. Snipe Frog 150 days trom receipt; customers abroad please add MMII 37/6 each.|Every1hinglv.g.c.(80. Ponngrove Rond, postage to cost. A ll our work guaranteed for one Wanted Fox 40 BB crankcase in good condition. H e re fo rd ' month trom the time you re c e iv e the engine. Complete engine considered. Any price paid. Cllpslonv. ENQUIRIES, SPARES, etc., please send stamped 41, Taunton Way, Stanmore. Middx. For Sale Pixie Rx and Tx £12. Futnbo relnyleea Rx and envelope or reply coupon. Escapement £6 Elmic compact escapement 40/ Royal single servo 70/· Minicombo II servo 30/ A M Annuals Bound Aeromodullers. Wanted 1940-41-42-43 (or 1948/64 . 70 Goldbero Junior Falcon and Star Me 109 complele unbound) B. Cramp. Ill, Fulwell Road. Sunder­ hits. 20 · each. M ills .75 40,'-. Arbor, Ingleslde Oee Cres­ land. Co. Durham cent, Farndon, Nr. Chester. Tel Farndon 453. SAW. Single channel receiver matching transmitter. Built-in pulse unit lor optional joystick control Galloping Ghost models. Receiver In model M ils .75 c.c. Conquest nctuator. Part-built “ Galloper ' with AM 15 R/C Mighty Midget and all accessories, plans for details. Reynolds CASH OFFER BY RETURN for small diesel 49, Oodnoy Drive. Lea Preston engines and all types Of petrol engines. RADIO Equipment largest stockist List of 90 collectors engines forwarded on request. ROLAND SCOTT, in the country. Single, multi pro­ Taurus S/T 56. F A M Midas Matador Deac 500. 5 Bonner Ouramltcs Brooks amplified, also another un- 147 D e rb y S tr e e t, B o lto n . portional, all R/C engines and pninted Taurus, £90. W ill demonstrate and sell separ­ accessories. Call, write, phone. ately. Orbit 10 relay outfit £20 Blddlccombn. 24. Javelin Road. Thorney-lsland, Emsworth. Hants. Wanted good R/C transistor radio WANTED Raven single channel receiver and Elmic Commander. equipment, engines, servos, air­ F.M. "Hercules" 10Channel transmitter, F.M. 'Midas’ Please state oiice and condition. D Green. 19. Spenni- frames. 10 channel auperliet receiver. 4 Brooks amplified Dura- thorne Road, Fllxton. Lancs. mites. Dcacs. all lilted In Smog ready to tty powered by Super Tiore R/C 51, plus Mcrco R/C 35 and several R/C Radio Control Supplies, 581 air frames etc. £65. Phone Hayes 4639 during wo'klng W ill pay cash lor second hand or new engines: Cobra hours or write, Welham, 45, Sherrldan Road, Worthing, .049. 2A 92. AS 55 E. D. Cadet Bee, Baby, Frog. 5cc. or London Road, Isleworth. Middx. Sussex. any other discontinued engines tcc ard smaller State ISL 0473. condition and prico. John Ktickcl, Box 353. Fort Rucker, Carter Oooling 29—ex Ray Gibbs with speed model. A ln b n m a 36360 U S A Oollys, Accumulator, pan, props- £12.10.00. Taifun Hurricane 1.5 c.c. with gaielle and speed model 40,- M ills. .75 C.c. 20". Cox Tee Dec 20/-. Cox Babe Bee 20;- Wanted.Connecting rod lor M ills 1.3 M kll or complete Atwood 10 c.c· glow, 100 twin ball bearing Arden. Two years Model Aircraft and Aeromodeller 15,·. A ll in engine. 7. Richard Knight House. Favarl Road. London 199, SO.'-. 8 o th p e rle c t c o n d itio n . H e rb e rt, 66. B roadm ead good condition. 24. Brlndtes Close. Hutton Essex. S .W .6 . Rond. Folkestone.

For sale poworful Macgregor tone transmitter. Nearly new otters Kettley, 77. Wcs'lands Drive.'Heden. Hull, "STANT” PROPS. NOTHING SELLS E. Yorks. Tel. Heden 895460. SPEED - TEAM RACE - PUSHER like an AEROMODFLLER classified. First name Works Tuned Oltver'M klll2.5: c.100 ·. Webra Mach I A ll at 2H1d. ea. Inc. P.T. yo u r o n c e and d e s c rib e yo u r w ares and y o u r a dd re ss, mod. 80/-. W right, 28,\Grace Avenue. Maidstone. Kenl. all at 4d. per word; then send your copy as toon as RETAIL ENOUIRIES WELCOMED you can—complete with cheque, postal order or —SPECIAL EXPORT TERM S - International Monoy Order. You won’t be dl»· 2 E.D. Racers Mklll Μ :- each. 3 E,D. Racers Mkll 20'· a p p o in te d . each.Voron M ini Robot 45* S. £5 R.E.P. Gemini Tx and Rx c/o The British Legion Club. £13. Elmic Commander. W cstall 84, Papist Way. Cholsey. UNLESS YOU ADVERTISE B erks. Lonomore Estate, Horsham. Surrey. Look here for this month's bargains. Pagco .09 mint In box 1941 Sky Chief 8.6 c.c., used bu complete. Both only, to highest bid over £12. Poynter. 10348. Langdon. Granada Hills. California. U.S.A, MacGregor Crystal Transmit!er Minimac Receiver £10 SITUATIONS VACANT O.S. 19 R/C £4. O.S. 35 Stunt 50 . iTnplln Twin W/C £5 Experienced assistant wanted for Model Shop. S day A M 15 50 ,·. A M.15 45 ■ K 4 B Torp.29 50 -. New K A B week Apply Jones Bros 56. Turnham Green Terrace. Model Airplane News Plans Toro 29 80'-. Mule .75 35*-. Ed Super Fury 60 -. New Jena C h is w ic k W .4 C H I 0858 2.5 W 'C 80*'-. M erco 53 S tu n t 6 0/·. C ox .049 20,-. F ro g 1.50 Recent Addition 50,-. Chippy. 5. Station Street. Sunderland. M .A.N. S3A. Graupner 8 Channel Rx Tx almost as row. Tone-filters. HOBBIES LTD. Petite Parasol > A radio control single channel. Servos Deacs. Charger £80. o.n.o. Pearson. 25. Davehall Are expanding the number of their branches and parasol wing soon model, with Avenue. W ilm tlow. Cheshire. have vacancies for Branch Managers and Asst. scale lines and open cockpit. Branch Managers In London and the Provinces. W in g s p a n 41} in s . to take .09 Applicants should be keen and enthusiastic. (1.5 c.c.) engines, designed by For Sale A.M.15 practically unrun £2. or nearest oiler. Preference w ill be given to Mode! Trade experience. R. J. Fldance Jnr. A. Keeper. 31. Blackwoods Crescent, Mossend, Lanark­ shire. Scotland. Pink Fink III:· Ultra simple control line Rat Racer with profile fuselage. To suit .29—.35 (5-6 c.c.) engines, wingspan 27} Ins. designed by SPINAFLO SILENCERS OF SPECIAL INTEREST A rt Atkinson. 42<6d. to 62/M . TO THE TRADE Douglas 0-43A > Free flight power scale model, of Largest range of Silencers In the world Douglas observation aircraft. o ve r 75 ty p e s Capacity available tor smalt Iniectlon mouldings W in g s p a n 40J In s . to take .049 These bright anodlsea units are a rewarding Investment for all discerning modellers. Fuel to 1}or shot weight. Small or large quantities (,8c.c.) engines.designed by Tom ita rk . economy and model cleanliness «re but two of welcomed. Economical mould costs. Prompt many tid e benefits. Made to fit any sidostack engine. S e rvice . Limited stock only, order while they last! M ini lor .09 to .15. Standard for .«9 to .38. Super tor .49 to .61 SCOTT PLASTIC PRODUCTS For a full list of M.A.N. plans send 4d. Lain! Additions E n y a 60 T / V E .D . 246 stamped addrossed envelope. All plans All complete with mounting strap, adaptor block 65A St. Marks Road, machined to close limits and colour anodised MAIDENHEAD, Berks. are priced 7/6d. plus 6d. postage from rotary flow diffuser. Aeromodcllor Plans Service. 13—35 D.A.C. COMPONENTS. Albion Rd., Horsham. Sx., Eng. Tel. Maidenhead 26044 Bridge Street. Hemel Hempstead. Herts. A ll leading kits and engines in stock. M O D E L N E W S (A u s tr a lia )—p u b lis h e d B i-m o n th ly . 12s par year, starling posted direct, covers all Australasian Aeromodelling In pictures, features and plana. 11. Model Airplane News Plans West King Sheet. Southport. Queensland. Australia. Latest Addition Aeromodeller back Issue. Mart vast stocks ot back laauet held In stock. Beaumont. 11. Bath Street, London M .A.N . S4A E .C .l. Ρ·Μ> Control line Hunter styled from the B eaum ont well-known twin engined fighter. Has one engine in fuselage and two booms with dummy spinners. To Read "Popular Flying", the alt.-montha teke .35 (6cc) engine, 551 Inch wing span, designed by 8lll Suarez. magazine ot the Popular Flying Association, the re­ presentative body of ultra light and group aviation. JA Go-Go:· Free flight conteat oylon model lor Every model, technical reference 049 (.8cc) engines, wing span 47 or historical book on aviation, Full membership £2 per annum. Maoazlne subscrip­ inches, simple construction, designed plus plans, photographs. tion only: 12 Issues 24s. post tree. Specimen copy by M ike C o ok. Send 1 for 22-page catalogue. 2a.0d. Irom the H/C Floats :· Simple balsa and plywood floats tor a POPULAR FLYING ASSOCIATION multi radio model lloat plane con­ Aviation Literature Elalree Aerodrome. Boreham Wood. Herts. version. |Full-s>xe formers and support brackets. 34 inches long x 4 inches 11 Bath Street. London. E.C.l T a l . : E l . t r · · 4479 CLE 9612. wide designed by John A. Oavin. Open dally 9.30 a m. to H p m. Limited stock only, order while they last! For a full list of M A N. plans send 4d stamped addressed envelope. All plans GLIDING HOLIDAYS are priced 7/6d 6d postage from Aero- From A pril to September with the Kent Gliding Club modeller Plans Service. 13-35, Bridge BOOKS at Challock, Nr Ashford. Kant. Resident Instructor, SAILPLANE A GLIDING—THE magazine· fo r a ll g lid m q Street, Hemel Hempstead, Herts. enthusiasts Published alternate months Send 4 - for Dual Control Gliders. Reduced Rates from A pril to c u rre n t co p y o r £1.4 Od. fo r a y e a r's s u b . lo B ritis h G ild in g first week in June. For further details ancloaa a Association. Artillery Mansion, 75. Victoria Street S.A.E. to Course Sac. London W .1. A. L. Cosans. Prabblas Hill Cottage, Pluckley Gilding holiday courses with tho Lakea Club. One Ashford, Kant. MODEL-AVIA, the model magazine that covers the week £17.17.0d. Fully inclusive. For brochure world ot model flying. Edited In French. Send lo- free specimen and subscription details. Model-Avia. 31. rue «bbly;- D. H. M lllett. 27. Scotforth Rosd. lancailor. du Pnntemps, Bruxelles 5. Belgium. TRADE ROSSI 60. 10 c-c. chromed. £17; Rossi 60 (chromed) American Magazines. Year's subscription 'Mode R C £19.10 Od. R o ssi 60 S T D £13 10.0c; S peed pan for Airplane News' 46 6.1 'American Modeller 35 M 2.5 c.c. with spinner £ t: 5 c.e. pan £1.5.0d; 2.5 c.c. team 'Air Progress 39/6J. Full catalogue tree W illen Lid.. race pan 13 ·: 4 grades glow plugs 4 j- each: Vulcan iel (Oept.1.) 61a, Broadway, London E. 1$. £12: 6 « 8, 6 x 9. 6 x 10, speed props.. 3 ί·; 7 x 8. 7 x 9. 7 x 10. 3 '2 d ., 9 A 11. 9 x 12. 9 x 13. 4 ,-. R ossi V ia P la ce 13' Brescia Italy.

DIETER HOFFMANN PUBLICATIONS ON \C A D A TIMERS Fuel shut-oils and dethermaiisers THE GERMAN LUFTWAFFE 27/- each post tree from Michael Smith. 1. Station Road, New volume (coming shortly): Dora Kurlurst und Kimberley. Wymondham. Norfolk. rats 13. Voi. III. Fnrlier Black-and-While Photo Volumes: Dora Kurfurat. Vol* I A II. Average 185 pages, 450 photos. (Above all 45s. each, oosl free) f· BINOCULARS. Amazing new 8 x 30 prismatics a·. Also available Markings A Camouflage W.W.II. £9.19.6(1 offered on 14 days free trial Irom CHARLES Vol. II. 112 pp., 130 photos. 42 drawings, 140 colour FRANK LTD., SALTMARKET. GLASGOW . lllus. (59s. post free). Summer pubn. Die Ritter· MeusUuger. Vol I Jagdflleger. Onfalls Infer. Obtain trom your usual bookseller or direct from the PORTSMOUTH & SOUTHSEA Hobby Shop .s "Robin Import Agent: Thwalles", 28. Arundel Street, Portsmouth. Early closing Wednesday, open all Saturday. Graham K. Scott. Booksoller, 2 Broadway. Frlern Barnet Road. MODEL AIRCRAFT London. N tt. ENGINE TESTS TELL THE ADVERTISER you read h it announce­ Peter Chinn ment in AEROMODELLER—he will appreciate the 5 x 7$ in s . 100 p a g e s. S tiff Aerial Warfare. Aviation. Airship Books Wanted. knowledge of how you came to learn about hit Sales Booklist—4d. (New. Usod). Bookshop, 116. Bohe­ b a rg a in . card cover. mia Road. St. Leonards. Sussex. Twenty three engine tests illustrated with actual size Interested In Contest Flying? Read NORTHERN side elevation drawings, AREA NEWS. 9 - per year Irom Ron Firth. 30. Struan SPECIAL OFFER power curves, photo and Road. Sheffield. 7. Advertising Pencils. Superb Ball-Pens. Combs. Brushes, etc. Raise fu?ds quickly, easily. Details— general power and handling Northern Novelties Bradford. 2 review. T h is 5/0d. book now offered to clear last remain­ No Deposit! PROPERTY ing stocks at the knock-down Freehold, long established Model Shop, fishing tackle, sports and newsagent etc.. For Sale large premises, price of doublefroniage. Main Road. Midland. Owner retiring age. RA D IO GEA R B ox. No 782 including post 23 ★ 100%Credit terms now available

to modellers, with low interest rates DEALERS—Turn your surplus stock Into cash. Who is BINDING? Special Offer------Definite offers by return for any quantity of Engines. MACGREGOR Crystal controlled R'C units. Kits and Accessories. Authorised agent for standard style binding Transmitter ROLAND SCOTT. MINIM AC. COMPACT Escape­ of Aeromodeller and ment, Deac, plus Charger, Post A 147 D e rb y S tre e t. B o lto n . other Model Aeronautical Packing Press Journals, to whom 48 weeks at 12/- per week £26 all loose copies of issues or 89 weeks at 7/- per week should be sent, is;- AIR PICTORIAL Write for details for your own choice There's always something new In AIR PICTORIAL Beaumont Aviation Literature, Britain's finest authoritative monthly maoazinc of equipment on air affaire. Keeos you In the picture ol develop­ 11 Bath St., London, E.C.l. ments every month. Nearly 80 brilliant photographs. SUN LANE CYCLES At newsagents and bookstalls 1st each month 21·. charge per volume £1 Ann. sub. Inc. post £1.10. Send remittance to: 59 Sun Lane, Gravesend, AM. AIR PICTORIAL. Rolls House. Breams plus post and packing, Kent. Phone 67587 Bldgs., London, E.C.4 index provided. WE STOCK FREE! EVERYTHING FOR THE AEROMODELLER! (Please note revised shopping hours from June 2nd) (for genuine modelling enthusiasts) Motors— Send SAE for list of over 100 types R/C Equipment— RC5. Futaba. OS, Citizenship. Telecont. etc. Kits by Keil. Veron. Frog. Graupner. Mercury, etc. LISTS— SAE Now in: R/C Glider Kits, including Graupner HS9I, ’Clou' 199/6 FULL LISTS OF AEROMODELLER SCALE Accessories, fuels, paints, transfers, balsa, obechi. plywood, etc. DRAWINGS AND MODEL AIRPLANE A ll regular kits, motors and accessories in stock NEWS PLANS RANGE TO ALL APPLI­ JONES BROS. OF CHISWICK CANTS SEN D IN G STAMPED (4d) & S6-62 TURNHAM GREEN TERRACE. CHISWICK. W 4 (Phone CHI 08S8) RETURN ADDRESSED ENVELOPE TO:— ( I min. from Turnham Green Station) Established 1911 HOURS : Mon.. Tues., Wed. and Sat, 9 a m.-6 p.m.; Fri. 9 a.m.-7 p.m. A P S (LISTS) 13/35 Bridge St, Hemel Hempstead Closed oil do/ Thursday

FOR AIRCRAFT Heron A/C 66/11 Snipe A /C 73/11 R/C Snipe A /C 87/0 FOR BOATS Heron W /C 91/10 Snipe W /C 99/7 Snipe R/C W /C 113/2 Effective silencers available

Top quality trio Great for Value PRECISION BUItT BY MAROWN ENGINEERING LIMITED UNION MILLS. ISLE OF MAN

MAP. INSURANCE MEMBERSHIP FORM

£ 5 0 , 0 0 0 I PART I. TO BE HANDED TO NEWSAGENT INSURANCE · To ...... Pleese 'reserve/dellver one copy of 'AEROMODELLER/MODEL BOATS/MODEL CARS/RADIO CONTROL MODELS 8. ELECTRO- We are able to offer a £50.000 third party insurance NIC5/MODEL ENGINEER/MODEL RAILWAY NEWS commencing to our readers! This magnificent scheme which covers modelling activities within Great Britain, Northern with the ...... Issue. ('D elete as applicable ) Ireland. Channel Islands and the Isle of Man. has been negotiated with a leading insurance Company to provide exactly the cover which the Air Ministry requires when its Name airfields are used for model flying. It is also su^icicntly embracing to cover all other forms of model activity, and Address ...... so should be completely acceptable to Local Authorities. PART II of the Form should be completed and sent to us at the All that is necessary for you to do to obtain the bene­ address below together with your remittance o f 2/6d. PART I fits of this magnificent cover is to complete the forms at should be handed to your usual supplier, either newsagent, model the right of this announcement, sending the first part to us shop, bookseller or wherever you normally expect to get your together with your remittance of 2/6d. which covers you magazine. for one year, and handing the second part to your usual magazine supplier. Whether or not you already have an order in hand for the regular supply of your magazine, this form should s till be handed in and your dealer will PART II. TO BE SENT TO M A P. LTD adjust hi$ requirements according to whether you are a new customemr or merely continuing your old arrangement Name (In fu ll) ...... This insurance is the prudent thing for every modeller to take out. By joining M.A.P. 'Modellers' Accident Protection Address ...... you come into the· world's BIGGEST MODEL CLUB. For your initial subscription you obtain a lapel badge for identification and transfers to put on your model ...... D a te ...... Complete your form and send off at once. We will I enclose herewith postal order value 2/6d. fo r membership o' send you back your membership card, larel badge and M.A.P. £50,000 insurance «heme. This sum. I understand waterslide transfers immediately. Insurance period com­ Includes two transfers and a lapel badge, and is conditional upon mences immediately. Renewals w ill normally be made my ordering from nearest quarter day. and renewal reminder notices duly sent. • AEROMODELLER * MODEL BOATS * MODEL CARS * RADIO CONTROL MODELS 8, ELECTRONICS * MODEL ENGINEER * MODEL RAILWAY NEWS ('D elete those not Model Aeronautical Press Limited applicable.) I have today Instructed my newsagent ...... 13/35 Bridge Street, to deliver me the magazine ...... until further notice. Hemel Hempstead, Herts, FAREHAM Td 4,36 G. Μ. H. BUNCE & CO. LTD.

206 WEST STREET. FAREHAM Aircraft, boats, engines, radio control. Engineers/woodworkers tools & machinery.

Phone: FARNBOROUGH 43080 MODELS & HOBBIES 216 FARNBOROUGH ROAD. HANTS Aircraft. Boats. Engines, Radio Control, servos and all accessories. AGENTS FOR ALL LEADING MAKES Prompt Mail Order Service

BRADFORD T“ 26166 Tel.: BIRM INGHAM vic,0ri* 4,17 GUILDFORD Guildford 2247 BOB’S MODELS THE MODEL SHOP 520 COVENTRY ROAD, PASCALLS MODEL SHOP 182 MANNINGHAM LANE SMALL HEATH, BIRMINGHAM 10 E. PASCALL (GUILDFORD) LTD. Model Aircraft Centre of the Midlands. (Opp. Bellevue School) Opposite Astor Cinema A ll the best in British and American Kits. Engines, Radio, Accessories. 105 WOODBRIDGE ROAD, GUILDFORD Yorkshire’s Telecom Stockists. Products. Stockists of all leading makes of model We offer you help and advice backed Solarbo balsa, silk, dope, plywood, etc. Mail Order. S.A.fc. for lists. kies and accessories. ^ b ^ iO years' experience^^ Mail Order Service. M.E.T.A. Dealer BIRM INGHAM ^iL: NOR 5569 CARDIFF T*,: 29065 HEMEL HEMPSTEAD BUD MORGAN Tel.: Hemel Hempstead 53691 THE MODEL MECCA The Model Aircraft Specialist 204 WITTON ROAD. For KeilKraft, Mercury, Veron. Ripmax TAYLOR & McKENNA BIRMINGHAM 6 MacGregor R/C, R.E.P. Radio Control. (Hemel) LTD. Revell, Airfix. Frog. Monogram 203 MARLOWES Aircraft. Boats. Trains, etc.. B'ham’s K.K. Handbook 3 /-. A.P.S. Handbook HEMEL HEMPSTEAD. HERTS Telecom Radio agents. "Gena’ ' Fibre 2 /·. inc. postage. Send S.A.E.. stamped Glass Hulls. please for assorted lists. For Model Boats. Aircraft. Railways. ^2et&e 22^^ASTL^^RCADE^CARDIFF Racing Cars and Accessories.

B IR M IN G H A M M EAS 0677 CHICHESTER T“ 35,2 [ E N T Tel.: RAV 0818 THEY PERRY’S LTD. PLANET MODELS AVICRAFT LTD. 769 Alum Rock Road. Ward End. & HANDICRAFTS 6 CHATTERTON ROAD, BROMLEY Birmingham 8 108 THE HORNET. I sell as much modelling gear as I can CHICHESTER, SUSSEX afford to stock. Radio Control. Boats. British and Imported Engines. Kits and Planes. Good selection of wood and Radio Control units, etc. Model Racing Aircraft and Boat Kits. All Accessories accessories. Car and Railway sets and accessories. •'Tri-ang", •,Trix,\ ''Scalextric'' Whatever you want in the way of gear All Leading Agencies. Postal Service. Personal Service Mail Orders. for Aircrafts sake, send your orders here.

BOLTON Tcl 270,7 CHORLEY C h o r,t* 4707 KIDDERMINSTER ROLAND SCOTT LTD. THE HOBBIES SHOP MODEL MART Mail Order Specialists ( j. D. R. CAMERAS) 2 Comberton Road (opp. Railway Station) The obvious shop for all your modelling l ST. THOMAS'S ROAD We are Aeromodelling enthusiasts, and requirements. The showroom of the North. CHORLEY, LANCS wish to help you with your requirements. Phone your order ANYTIME Model Aircraft. Boats, Radio Control MAIL ORDER SERVICE 147 DERBY STREET Model Cars. Railways & All Accessories Headquarers: Kidderminster District F.C. BONESS T*' 2482 DONCASTER 161 2524 LANCASTER

THE WOOD SHOP B. CUTTRISS & SONS THE MODEL SHOP 8 CHINA STREET 43 NORTH STREET, BONESS MODELS AND HANDICRAFTS Large stocks of all Plastic and Flying WEST LOTHIAN 40 DUKE STREET Kits. Engines and Accessories. Scalex trie Roadways. Tri-ang and Lone Star REVELL. RADIO CONTROL. Call and see our Shop Electric Railways.

BOURNEM OUTH Parks3908nr EXETER Te,*: 76935 LEEDS Tel.: 27891 WESTBOURNE EXETER RADIO CONTROL 35 SOUTH STREET, EXETER THE MODEL SHOP MODEL SUPPLIES Kits and Accessories: 2 Grand Cinema Buildings, Keil, Veron. Skol, Goldberg, Sterling, S8 MERRION STREET Graupner, Dubro (N r. Tower Cinema) Poole Road, Boumemmouth West Radio by MacGregor. Citizenship. F. & M. The shop that meets a modeller's needs Bonner. R.E.P., O.S.. Minitron. etc. Model aircraft— boats— cars— railways, all — so why not visit us when in makes engines. Every accessory, R/C Bournemouth. PHONE OR CALL Mail Order by ret. C.O.D. with ^Icasui equipmment. Same day postal service. LINCOLN Tel 27088 LONDON T

Tel.: LONDON T" STE l,7J LONDON Tel.: TID 6292 MANCHESTER BLA 3972 D. BRYANT ANGEL THE MODEL SHOP 166 MILE END ROAD MODEL SUPPLIES LONDON. E.l 328 BROCKLEY ROAD, S.E.4 13 BOOTLE STREET YOUR Modelling needs are here. The For Futaba R/C equipment and all MANCHESTER 2 enthusiasts' shop run by enthusiasts! other leading makes. Keil, Veron, THE UP-TO-DATE SHOP WITH THE Full range of Kits and Accessories. Frog, Airfix, etc. Expert advice on COMPREHENSIVE STOCK Open all day Saturday. scale problems, easy parking Mail Orders by Return LONDON Τβ|·: Woolwich 2820 LONDON Tel-: CHE 4887

SIDNEY ROSS & CO/LTD. BLACKBURN MODELS LTD PRACTICAL 154 MERTON ROAD HOBBIES 9-13 POWIS STREET WIMBLEDON, S.W.19 WOOLWICH, S.E.18 Wide Selection : Helpful Service Complete range— Veron. KeilKraft. Frog For all OS Engines, spares, and R/C 14 brands in plastic kits STATION ROAD Mail Order Radio equipment and boat accessories MARLOW. BUCKS

LONDON Te>,: North 4272 LONDON Te>>: Let Gre*n 2637 NEWCASTLE Established 1924 LEWISHAM MODEL HENRY J. NICHOLLS THE'MODEL SHOP CENTRE (NEWCASTLE UPON TYNE) LTD. & SON LTD. 4S LEE HIGH ROAD. LEWISHAM. S.E.13 18 BLENHEIM STREET Tel.: 22016 308 HOLLOWAY ROAD. N.7 Everything for the Modeller, Aircraft. NEWCASTLE UPON TYNE, ENGLAND We stock only the best Boats. Radio Control, Railways. Cars Pioneers of modelling for AEROMODELLERS Spares and Repairs our speciality with 34 years' experience . . . Specialists in Radio Control Mail Order a pleasure Our Expert Staff are at your Service

LONDON ISLeworth 0473 LONDON GRA 2471 1 Tel.: Derwent 6495 RADIO CONTROL A. G. HERMITE THE LITTLE ARTIST SUPPLIES (MODEL SUPPLIES) 505 LONDON ROAD 581 LONDON ROAD NORTH CHEAM. SURREY ISLEWORTH. MIDDX 633 BARKING ROAD. WEST HAM, E.13 Complete range of Leading Kits, Engines Mail Order Specialists Aircraft— Boat— Car— Plastic Kits 4 R/C and accessories Largest stockists of Radio Equipment, Saturdays 9 a.m. to 6 p.m. The new Futaba radio, and MacGregor, Engines and Accessories in the country Postal Service of course ^^^omgrehensw^^tocj^^^^Ustks^^^ LONDON Te,-: ^ J482 LONDON TeL: ACOrn 3886 1N O TTIN G H A M Td 50273 MODEL AIRCRAFT R. T. BROWN OF ACTON GEE DEE LIMITED SUPPLIES LTD. TOWN 29 OLD KENT ROAD, S.E.l 312 UXBRIDGE ROAD. ACTON. W.3 40 GOOSE GATE Business Hours: Specialists in: NOTTINGHAM Monday-Saturday, 9 a.m.— 6 p.m. F/F — C /L — Gliders — Engines Call, phone or Mail Order Everything for the aeromodeller at Thursday, 1 p.m. Friday, 7.30 p.m. Nottingham's leading shop Postal Service Quick, Efficient Service LONDON Tel*: Brixton 5422 LUTON Tel 7858 i ILDHAM Te,-: MAIn 88,2 A.B.C. ELECTRONICS L. H. W. W Y A T T BROS. AEROMODELS (LUTON) (OLDHAM) LTD. LTD. 59 WELLINGTON STREET (RADIO ENGINEERS) 260 BRIXTON ROAD LUTON BEDS 83 LEES ROAD LONDON, S.W.9 All R/C components available for valve Stockists all leading makes of Plastic and Model Aircraft, Cars. Railways and or transistor Tx/Rx. Deacs — Graupner Balsa Kits. Also "Tri-ang” and Scalextric Boats for the beginner and expert — M eti — Schuco — Sterling — and all the others. Mail Order. S.A.E. for lists OXFORD Tel 4240 SU TTO N Tel,: Vigil*nt 8292 A U S TR A LIA ™ MF 3918 HOWES MODEL SHOP E. L. S. MODEL SUPPLIES CENTRAL AIRCRAFT 9-10 BROAD STREET Largest stock in the Midlands 272 HIGH STREET, SUTTON. SURREY CO. PTY. Model Aircraft— Railways— Cars S PRINCESS WALK. MELBOURNE, C.l Boats— Radio Control SURREY S HOBBY CENTRE Run by Modellers for Modellers BY RETURN POSTAL SERVICE Australia's Main Distributor for: MAIL ORDERS BY RETURN Complete stock of all M.A. requirements AEROMODELLER — MODEL BOATS and their Plans Service MODEL CENTRE POYNTON 4377 TENTERDEN Td Ten 3326 A U S TR A LIA r e , f|?J F. A. & F. ALLEN HEARNS HOBBIES LTD. TELEGEN SERVICES 303 FLINDERS STREET and 5 COLLINS STREET, MELBOURNE 2 DICKENS LANE 4 EAST CROSS. TENTERDEN, KENT POYNTON, CHESHIRE Our 1965 world buying tour brings the if Radio Control Specialists ★ A ll leading makes of kits, engines and tops in all areomodelling equipment to Guaranteed repairs— all aspects of accessories our shelves. W c fly what we sell. All the hobby catered for — H.P. terms O.S. gear in stock. Your business is our Call, write or phone pleasure. Mail Order service a speciality READING RMdin* 5,55 TUNBRIDGE WELLS CANADA Tel.: 22078 MODEL SUPPLIES MAYKIT LTD. NORTH YORK 1 HOSIER STREET, ST. MARY’S BUTTS HOBBIES READING, BERKS S6 GROSVENOR ROAD AIRCRAFT— BOAT— CAR— R/C KITS 1910 AVENUE ROAD FOR CHEERFUL SERVICE WITH TORONTO 12, ONTARIO MODEL AIRCRAFT AND BOATS Radio Control and Actuators— Engines CALL. PHONE OR MAIL ORDER KITS AND ACCESSORIES Planes, Trains. Boats. Racing Cars, etc.

HONG KONG Te!.: 636507 ROMFORD TeL: ROM 44508 WAKEFIELD Tel 7,459 THE MODEL SHOP RADAR CO. LTD. HOME & HOBBY STORES 2 OBSERVATORY ROAD 144 NORTH ST., ROMFORD, ESSEX (WAKEFIELD) LTD. TSIMSHATSUI. KOWLOON 10 MARYGATE, WAKEFIELD The most complete stock of aeromodelling Goldberg — Graupner — Mail Order — and hobby supplies in the Far East. Agents Kcil — Vcron — Frog — Top Flite — The all round model shop run by for Vcron. Frog, Solarbo. and Sole Agents MacGregor — A.P.S. all round modellers for Graupner. O.S.. and Min-X engines and Late Closing Fridays 7 p.m. Mail order a pleasure radio control equipment Prompt mail order service

SHEFFIELD Tel 26,49 W ALSALL Tel 23382 HONG KONG SHEFFIELD ELECTRICAL S. H. GRAINGER P.H.L. MODEL CO. & MODEL ENGINEERS CALDMORE MODELS (Model Builders & Engineers) 40 ELECTRIC ROAD. CAUSEWAY BAY 248 SHALESMOR, SHEFFIELD 3 108 CALDMORE ROAD The largest stockists of Hobby Supplies in THE REAL MODELLER’S SHOP for Everything for the Modeller Hong Kong. Sole Agents for KeilKraft. RADIO CONTROL — AIRCRAFT — Aircraft · Railways - Boats · Electric Cars. Aerokits. A.M., Mcrco, DeBoit and BOATS — RAILWAYS — CANOES — Repairs - Rcbores - Overhauls - Spares - Ambroid Agents for Ohisson-Rrtce, Cox DINGHYS & SAILING GEAR______Radio Control · Part Exchanges Thimble-Dromme. and other brands STAFFORD Tel 3 WELWYN HEMEL HEMPSTEAD Tel.: 2501-2 JOHN W. BAGNALL H. A. BLUNT AEROMODELLER MODEL CRAFTSMEN’S SUPPLIES & SONS LTD. 18 SLATER STREET, STAFFORD 38 FRETHERNE ROAD PLANS SERVICE 13-35 BRIDGE STREET WELWYN GARDEN CITY. HERTS The 100 per cent Model Shop since 1936 Open Monday to Friday is well worth a visit. Complete range of model aircraft, engines Send 2 /- fo r our illustrated PLANS Sales and Service with Satisfaction j and accessories, boats, cars and railways HANDBOOK of thousands of models ST. A LB A N S Tel 507,7 WOLVERHAMPTON SINGAPORE Tel.: 26709 BALBIR &. CO. BOLD & BURROWS LTD. MODELS & HOBBIES I l l NORTH BRIDGE ROAD BELL STREET. MANDERS CENTRE SINGAPORE 3 WOLVERHAMPTON 12.22 VERULAM ROAD Leading stockists of Model Aircraft ST. ALBANS. HERTS EXPERTS COME TO US requirements in Singapore and Malaya VISIT US AS WELL WE HAVE ALL THE BEST IN MODELLING

STOCKPORT Tel STO 5478 W ORKSOP Te' 2855 EVERYWHERE THE MODEL SHOP MODEL CENTRE MODEL SHOPS RYTON STREET Can announce their whereabouts and 280 WELLINGTON ROAD SOUTH wares for as little as £1 per month. (BRAMHALL LANE CORNER) Main agencies for all Kits. Engines and Send for details of our M.S.D. rates to Aircraft. Boats. R/C Equipment. Engines. Radio Control equipment Aeromodeller Advertising, 13/35 Bridge Raiilways. Car/Racing. Plastic Kits Street, Hemel Hempstead, Herts. Postal Servie Mail Order Service PROFILE PUBLICATIONS LTD W . Wren 4 Sons THERE IS A PROFILE STOCKIST NEAR YOU! HERE ARE SOME OF THEM . . . ' . A series that astound* with its intri­ Exchange Rd. W a tto rd cate detail and admirable presentation."— L o n d o n T h e M o d e l S h o p . 28 S u rre y W ilts h ir e Aero7iorfe//er Allen Brett Cannon. Tower St. Kings Lynn A d d le s to n e M o d e ls W illis of OevUes, K e n t "H o rn 's th e answ e r to th a t g ilt p ro b le m . . W iillm e n ts . 86 St. L td . 6 8 H ig h SI. 29 M n ry p o rt St, Bakers Model Shop. 32 R a ilw a y A p p ro a c h -M eccano Magazine London. Bridge Benidlcts, Norwich Addition* P e v ite s British Stockist* See what an American 14 Canterbury St. C .H a m le y L td . 23-25 Gillingham Approach, S.E.1 W ilto n s (S p o ils 4 dualcr says . . . "Fastest selling aviation 8ec Model*. N o rth an ts G eo rg e S f. C ro y d o n books ever published . . ."—The Slg Barretts Lid, G am es). C a na l 4 10 T o o tin g Bee Rd. E. Berwick, 4 Dalkeith E. H e nd e rso n. 23 Manufacturing Co. Inc. Iowa 2 St. Georges St. Queen St. Salisbury S .W .17 Place. Kettering W aterloo Rd. Epsom "Profile booklets are a remarkable value Canterbury B lu n ts f t Son, Hesct Model Sup­ Beancys Models, and to be highly recommended."— The 133 T h e B roadw ay. O liv e r C arley. plies. 61 Brighton Rd. W orcestershire f ly e r O hio 55 W e s t St. M ill H ill. N.W.7 35 Broadway. Peter­ South Croydon O. C. Hemming way, Sittingbourne b o ro u g h B M W . Models. Kingston Model Sup­ 86-88 W orcester Rd. G. 4 E. Gray, 329 H a y d o n s Rd. Η. M . Law. Main St plies, 18Hloh St. G re at M alvern E d in b u rg h Bedfordshire High St, Staplehuist Wimbledon. S.W .I9 Post Office, Ousfon Kingston-upon- A e ro m o d e is (L u tv n ) Bmns Ltd, Princess H u b b le 4 Freem an. T h e N u rse ry. 5 W o r- C .P . Dyne. 178 Messrs. Llttlefolk. T h am es coster Rd, Broms- U d 59 W e llin g to n S t 2 23 Gabriels Hill, Falcon Rd.S.W.11 M arket St. P a s c a ll (G u ild fo rd ) S i. L uto n M a id s to n e grove H a rb u rn H o b b ie s . Gar is a n s , 89-91 Wellingborough L td . 105 106 The P. Μ. Tanser. Model 124 L e ith W a lk , β Kingcraft Models. Turnpike Lane. N.8 Super Model Aircralt Broadway. W ood- B e rk s h ire 136 H ig h S I. Mart. Kidderminster Homecrafts. T h o m a s H a ll L td . 5 Supplies. 220 bridge Rd. Guildford Lames Ltd, 24 Tudor 10 G ille s p ie P la c e , 10 R a m sg alc Rd, Reading The M all. Ealing. W.5 W e llin g b o ro u g h Rd, Whitcwoods. Y o rk s h ire L cC o ro M o d e ls . 264 H o m e cra ft £ M o d e ls . E. J . H e ra u d L td . 54 Northampton 103 Brighton Rd R . L. 4 P . O . C la rk. High St. Rochester S u rb ito n 51 Cheap St, E ssex Fore St. Edmonton, 34 L o w th e r A rca de . N ew bury C h e lm s fo rd M o d e ls . leCore Bros. N.18 Nottinghamshire R. W ills Ltd, H a rro g ate 204 Vojlsharn St. 373 High St. Chatham 92 Brighton Rd. Reading Model P earson B ro s Ltd . B. Cuttrlss A Son. 40 Chelmsford A. G. Hermite C o u ls d o n Supplies. 1 Hosier Lummus Toys. M o d e ls . 633 B arking L on g Row, D u ke S t. D o n c a s te r Freer Lloyd Models. 63 Tontine Rd. N o ttin g h a m S t. Readm o Rd. E.13 S u f f o lk 1615 Lo n d o n Rd. Folkestone H o m e c ra ft S u p p lie s G. W . Jones. Everybody's Hobbles. Ltd. 7 Market Way Buckinghamshire Leigh-on-Sea Maykit Ltd. Oxfordshire 56 T u rn h a m G reen 24 S t . Nic h o la s S t. W a k e fie ld A y le s b u ry M odel T h e G ift S hop. 56 Grosvenor Rd Terrace. W.4 H o w e s M o d e l Shop. Ip s w ic h S ho p . 46 N o rth ern 44 H ig h St. T u n b rio g e W e lls 9-10 Broad St. Oxford T h e M o d el S hoo. L a ffe a ty s . 332-334 H G . H a n n a n ts L td . Rd. Aylesbury Saffron Walden The Model Shop. 56 L o n d o n Rd N o rth . O un d as S I. Redcer K in g R d . S .W .3 Staffordshire 23 U p pe r S to n e St, L o w e s to ft M itchells. 52 Toll Lewisham Model M a id s to n e Bagnall Ltd, 18 Salter Gravel. Beverley More than a million Profiles Ctsntrc, 45 Lee H igh S I. S la tto rd S u s s e x Modern Models Ltd, The Model Shoo. Rd. Lewisham. S.E.13 S.H . Grainger. Arbers Ltd.208 sold in the first year 49-51 L o w fie ld S t. 58 Merrion St. Leeds Dflrtford London Model Colder Models, Queens Rd. Hastings S u p p lie s . 836 G reen 108 C o ld m o re Rd. Eastbourne Model Nicol Brown 4 Coyle, S he w s', 5 3 K in g S t. Lanes. N 21 W a ls a ll S ho p . 1856 L a n g le y C o m m e rc ia l S t. Bake'S. Buckingham H a n co ck 4 S m ith . 55 Ram sgate SI. Aylesbury H ig h S tre e t. Eppm g M o d el A irc r a ft S u p ­ Handicraft Centre. Rd. Eastbourne H a lifa x M u rra y s U d . S te d d y 's 13 G u ild h a ll plies. 29 Old Kent Dudley Rd, Planet Models. ΙΟβ T in · H o b b y S to re . St. Folkestone P ic k e rin g s . 10 M in ­ W hite Hart St. 49-50 Victoria Arcade. Rd. S.E.1 Wolverhampton T h e H o rn et. s te r G ate s. Y ork High v ycombe Southend-on-Sea S u n Lane C y c le s , 59 Models (City) Ltd. W a ls a ll M o d e ls 4 Chichester S. fere Lid. Hig St, Sun Lane. Gravesend J o h n T a y lo r L td , 28 Sportscralts Moduls. Ray Rippon. 2 T h e A rc a d e . L iv e r­ C ra fts . 123 W o lv e r­ S lo u g h P re s to n S t. B rig h to n 7 Blundells Building, 1030 L o n d o n Rd. Thanet Models. p o o l S t. E.C.2 h a m pto n S t. W a ls a ll 59 N o rth d o w n Rd B eve rle y R d. H u ll Lelgh-on-Sea W arwickshire B irm in g h a m M a rg ate G. Thompson 4 Son. C o le s S to re s. B a m b y 's , Tlmbtircrafl, Illustrated by Britain's leading 23CoUsgateHill, 10 C o l m ore Row G la m o rg a n KnowleHill, Huritry. N o rth S I. R ip o n 1A Codington Rd, aviation artist-draughtsmen Nr. Atherstone A ld h o u s e . Bud Morgan. A s h to rd 32 C h u rc h Rtf. 25 22 Castle Arcade. M e s s rs . G ill 4 S o n . Bob's Models. M. Turner 4 Son Ltd. T h e Parade. C a rd iff Model Supplies. 520 C oventry R<1,10 14 Lo n d o n Rd, D over Wolverhampton S u tto n C o ld fie ld E. 4 L. W oodrull 4 328 B ro c k le y Rd.S.E.4 Models4Hobb.es, Midland Educational T h e M o d el S hop. Model 4 Tool Sup- Burlington Passage. Gloucestershire S on . 245 Broadw ay. 19 S t . J o h n St. C o . 24-28 S ta tio n Rd. C liff Elderkin. Buxley heath olios. 604 Kingston Wolverhampton S o lih u ll 2 Rd, Raynee Park, The P errys, 769 25 Nelson Si. Stroud Midland Educational S .W .20 Alum Rock Road. 8 92 Fletcher's Sports. L a n c a s h ire Co. 1-5 City Arcade. What about the H . J . N ic h o lls Ltd. Tryfan Models. Winchcombe St. C o ven try bound volumes a* Ashton Model 308 H o llo w a y Rd. N.7 90 Rookery Rd. C h e lte n h a m T h e M o d el S hop. Supplies, 201 Old St. O .H P a tric k . 109- birthday presents, Hnndsworth, 21 Ashton-undw-Lynn S h ro p s h ire 62 Lower Ford SI. 111 L illie Rd. S .W .7 Hobby Specialists C o ven try or a six months' H a m p s h ire Harry Ball 4 Son. Ripmax Ltd, subscription? 8 r ls t o l L td . 27 W y le C o p . Toy tow n, 105 R egent B ond Toys. 8 China St, Lancaster 39 P arkw ay. N .W .t S h re w sb u ry Bristol Model Aero St. Leamington Spa 129 Charmmster Rd. E asiw ay K its Ltd. L. A . Richards Ltd, S up o ho s. Bournemouth 81 W e s tg o te . B urn le y 92 T h e B ro ad w a y. 51 C o ls to n S I. I W imhledon, S.W.19 C .L. Clark. S. J. Radwell Ltd. 40 G lo u c e s te r R d. 7 W aterloo Station D o w lin g s (B ook- United Kingdom Hobby Trade enqultf es to A rc a d e , W a te rlo o ShOD) Ltd. Rd. S .E .1 Richard Kohnstam Ltd, 13-1Sa High St, ?3Q ucong R d. C litto n E.F Russ. 101 Batter­ Hemel Hempstead. Herts. Hobbies Ltd. sea Rise. S W 11 65 Fairfax St. i E llio tts C am era T h e H o b b y S ho p Scale Models, Crafts. 31-33 Oueens- 17-19 B old S t. 420 R o m a n R d, E.3 Cambridgeshire way. Southamoton S o u th p o rt Mess's Tunneys. Auto models Ltd. G o s p o rt M o d e l S hop. M o d el D e p o : L td . 6 71 Turnpike Lane. N.8 21 K in g 's Parade, Bold St, Bolton W. H. Models Ltd C a m b rid g e 17 N o rth C ro s s S t. G o sp o rt H arry W e lc h Ltd. 85 14 New Cavendish St. Renbro (Model Dept), C h u rc h S t. P re sto n W .1 30 Μ ι 11 Rd G uy R a d io 'd A lto n W llr o M o d e ls , C a m b rid g e Ltd. 26 30 N orm anoy 20 C la re n c e R d, E 5 W is b e c h S p o rts 4 S t. A lto n Leicestershire M o d e l S h o p . 25 Apex Craft Ltd. Models 4 Hobbms. M id d le s e x Frank Herring 4 W . 4 G. Foyle Ltd N o rfo lk S t. W is b e c h 22-31 C h u rc h G ate, Beaumont Avia­ 216 Farnborough Rd. L eice ster B t a lle y s , 138 H eath t io n L ite r a tu re ( * t ) S o n ( ·) 27 H ig h (·) 119/125 Charing Farnborough Rd. Twickenham East Midlands Audio. 11 B ath S t, Lon do n W e s t S t. D o rc h e s te r Cross Rd. London Channel Islands M o deltoys. 17-19 Main St. Hodgsons Toys 4 E.C.1 D o rs e t W .C .2 F le tc h e rs M o d el M o d e ls . 46 H o u n s ­ 246 Kingston Rd. Market Bosworth W . E. Hersant Ltd Donald Bobin Ltd C. W .F. Skrim- S ho p , 42 C o m m e rcia l P o rts m o u th This Model Shop. low Rd. W hitton A rc a d e . G ue rn se y (·?) The Cholmeley ( · ) 9 15 V ic to ria shire. Bookseller (·) Tip Top Model Shop. 64 A s h b y Rd. M o d el S h o p . 31 S t. B oo ksh op . 228 A rc h ­ A rc a d e . S o u th e n d - 25 N o rlh a m Rd. Six Anns Rd. Harrow C h e s h ire 10 K in g s to n Rd Loughborough way Rd. Highoate. on-Sea. Essex Dials, Southampton, P o rts m o u th H ants The M o d e l S ho p . L o n d o n N.6 S is s o n 4 P a rk e r 280 W e llin g to n Rd Herefordshire The only collectable record o l aviation C. J.Pidler. Avia­ Ltd (·) Wheelui South. Stockport history, each Profile written by a world- tion 8ookseller(*) Gate, Nottingham C h a d d s o f H e re fo rd established authority on his subject 40 S t M ild re d 's Rd. Commercial SI. W yllies (Book­ C o rn w a ll Ramsgate, Kent H e re ford sellers) Ltd (·) 247 L F. Barham 28a O J S m ith 4 Son. A lle n S c o tt, 581 L o n ­ Graham K. Scott Union St, Aberdeen H ig h S t, Fa lm o uth Hertfordshire Castle St. Hinckley don Rd. Islewotlh (*t)2The Broad­ S. Solosy Ltd (·) 53 Available through B o ld A B u rro w s Ltd. P. L. W hitworth. way. Friern Barnet. D e rb y s h ire Charing Cross Rd. a ll b ra nch es of 12-22 V e ru la n Rd. Lincolnshire 371 S ta in e s Rd. W e s t Lon do n N.11 Cavendish Stamps. L o n d o n W .C .2 W . H. Sm ith 4 St. Albans Gee-Dec Ltd. A ih fo td 75 Sallorgafe, Bohemia Bookshop Sterlings Book- S o n . L td 29 High St, Skegness Chesterliold H. C. Green. ( • f ) 116 B oh e m ia Rd S to re L td ( ·) 57 S1 Claude G ill Books 25 H ig h S t. R oyston M u s g ra v c 4 C o M a n c h e s te r The Model Shop St Leonards-on-Sea. M artin's Lane. L td . 481 O xford St. D o rs e t T h u H o bb y C entre, (Tools) Ltd, Clasket- Sussex London. W.C.2 L o n d o n W.1 gate. Lincoln 13 B o o tle St. Broad stone Toy 53 M arket S i. M a n ch e ste r Centre. The Broad W a tfo rd Russells Module. way, BrondStOne Model Exchange. Newlands, Lincoln Norfolk 71 S t. A lb a n s R'J. J. Langley ACo. Greater London Area Bookseller Trade Enquiries to Durham County W a tto rd L iv e r p o o l 20 R o yal A rca de , The Model Shop. Taylor 4 McKenna P re c is io n M odel N o rw ic h Chater 4 Scott (Distributors) Ltd. 524 High Road. 92 Claypath. L td . 203 M a rlo w e *. E ng in ee ring C o Ltd F. M a rlin . 83 M arket Chiswick, London. W.4 Durham City Hemel Hempstead 53 W h ite c h a p e l. 1 Place. Swaffham From World War I to the war in Vietnam . . . that's the coverage offered by the magnificent Aircraft Profiles. Think of an aircraft (or better still, make a model of it), and the chances are that there is a Profile describing it! Or soon will be. For the same price as that of the cheapest proprietary plastic kit (yes, still only 2/·), each Profile booklet gives a detailed history of the aircraft by a well-known authority on his subject, beautifully propared full-colour general arrangement drawings and numerous alternative colour schemes by world-acclaimed illustrators such as Peter Endsteigh Castle, Richard Ward, G. J. Goulding, Kenneth Rush, Keith Broomfield and many others These are not encyclopaedias of one man's general knowledge!

New Aircraft Profiles arc published at the rate of six titles every month, but permanent stocks arc held of all previous issues. There aro also available attractive PVC binders (15/- each, holding up to 30 booklets) or. if you prefer, magnificent bound collections: Volume 1. Profile Nos. 1-24 (three-guineas): Volume 2. Profile Nos. 25-60 (four guineas) and, in July. Volume 3, Profile Nos. 61 -96 (four guineas). What better present could you give than a Profile subscription, or a Bound Volume. And have you heard of the Classic Car Profiles! 1 S.E.SA 28 Macchi C.202 2 Boeing P-I2E 29 Ju 88A 3 Fw 190A 30 Super Sabre 4 H unter 6 31 Sopwith Camel 5 Vim y 32 W a p iti 6 Bulldog 33 Gamecock 7 Thunderbolt 34 Fairey Battle 8 Mustang 35 Curtiss P-40 9 Albatros D.V. 36 SAAB J-29 10 Gauntlet 37 Curtiss JN4 II Halifax III 38 Fokker Monoplanes 12 Meteor 8 39 Supermarines S4-S6B 13 Pup 40 Bf I09E 14 Boeing P-26A 41 Spitfire 1 & II IS He IIIH 42 Fury 16 CR.42 43 Pfalz D ill 17 Spad X III 44 Fairey IMF 18 Fury 1 45 Curtiss Army Hawks 19 Liberator 46 Nakajim a Ki-43 20 F-86 Sabre 47 F4U-I Corsair 21 Bris. Fighter 48 Vam pire 5 Λ 9 22 CR.32 49 Nieuport 17 55 Fokker DR. I 96 Douglas DC-3 23 Bf no 50 Snipe 56 Flycatcher Published 4July 1966 24 Hurricane IIC 51 Gee Bee Racers 57 Hart 97 American D.H.4 25 Fokker D.VII 52 Mosquito 1 to IV 58 Hampden 98 Gloster Gladiator 26 D.H.4 53 W ildcat 59 B-25 M itchell 99 Fockc W ulf Fw 200 27 Boeing F4B-4 54 Canberra 1 to 4 60 Skyraider 100 P-51 BC Mustang 61 Ansaldo Scout 101 Boeing B-29 62 D.H.9 102 Douglas A-4 Skyhawk 63 Fokker D X X II’s Published I August 1966 66 Macchi M.C. 200 103 S.E.5 65 Lancaster I 104 P.Z.L. P-23 66 Vickers Valiant 105 Kawasaki Ki-45 67 Fokker D V III 106 Lockheed P-38J-M 68 Thomas Morse Scouts 107 Grumman Bearcat 69 Henschel Hs 129 108 D.H. Com et 1-4 70 Nakajima Ki-84 Published 5 September 1966 71 Hawker Seahawk 109 Hanriot HD I 72 Vickers Viscount NO Fiat B.R.20 73 Sopwith Triplane 111 Hawker Hurricane I 74 Short 184 112 B-26B, C Marauder 75 P.Z.L-PII 113 Messerschmitt Bf I09G 76 Junkers Ju 87A & B 114 E.E. Lightning I 77 Boeing B-I7E & F Published 3 October 1966 78 Gloster Meteor IV 115 Gotha GI-GV 79 Nieuport 28 116 Curtiss Navy Hawks 80 Curtiss H aw k 75 117 Boulton Paul Defiant 81 Hawker Typhoon 118 Kawasaki Ki-61 82 Mitsubishi Ki-46 119 Fiat G .91 83 Boeing B-47 120 Lockheed Constellation 84 Short C-Claat Boats Published 7 November 1966 85 R .E .8 121 Sopwith l{ Strutter 86 Siemens Schuckert 122 Polikarpov 1-16 D in ;iv 123 Reggiane RE 2000 87 Fokker C V 124 SB2C-I H clldiver 88 Ilyushin 11-2 125 Wellington I & II 89 Savoia S.M.79 126 Hawker Sea Fury 90 L.T.V. Crusader Published 5 December 1966 91 D.H.2 127 Albatros D l-lll 92 Grumman F3F 128 Curtiss Shrike 93 Bristol Blenheim I 129 Mitsubishi A6M2 Zero Send 2/6, postage free, for sample aircraft Profile (stating your preference) to 94 Focke W ulf Fw I90DTA 130 Messerschmitt Me 262 152 131 Lockheed F-I04G/CF-I04 PROFILE PUBLICATIONS LTD., P.O. BOX 26, 95 Republic F-84F 132 D.H. Tiger Moth la NORTH STREET, LEATHERHEAD, SURREY, ENGLAND spring to

For really successful modelling this season count on high grade Kcilkraft kits. Their superb flying qualities will th rill you right through the summer!

ROBIN FIREFLY NOMAD Duration model with good flying per­ Stunt model with "profile” type fuse­ Beginner’s model with fuselage parts, formance. Kit features die-cut parts, lage. specially designed for engines tailplane and fins in pre-cut decorated plastic propeller and wheels. An ideal under 1 c.c. Kit contains die-cut parts. sheet balsa. Wingspan 20". 5/11 "first” model. Wingspan 22". 10/7 Wingspan 20". 19/9

RADIAN Combat design of considerable strength. with coupled wing flaps and elevators Easy and quick to build. A fully aero­ Features all sheet construction with For .049 motors. Kit contents include batic model that is great fun to fly. wings, tailplane. fin and fuselage sides die-cut parts, stunt tank, preformed For 2.5 to 3.5 c.c. engines. ready cut to shape. Suitable for .5 to U/C, formed canopy, all hardware. Wingspan 32". 30/6 .8 motors Wingspan 16". 17/9 Wingspan 22". 21/3

Wingspan 48". For 1.5 to 2.5 c.c. engines. Single channel or intermediate R/C. £4. 18. 0 DEMON MINI SUPER Class A team racer to the new S.M.A.E Keilkraft’s newest radio control model. carriage, three sponge rubber wheels, specification. Kit contains die-cut parts A real pleasure to build and fly. Kit pre-shaped leading edge section, full For engines up to 2.5 c.c. contents include— all parts pre-cut. size plan and building and flying Wingspan 30". 36/3 metal clunk tank, preformed under­ instructions.

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