FEBRUARY I960 for smooth dynamic power

QUICKSTART FUEL

The manufacturers of Britain’s finest model engines now bring you Britain's finest fuels. Quickstart Glow Fuel Many hundreds of engine tests lie behind the Methanol based, lubricated with the purest castor oil, development of Quickstart formulae. well fortified with nitro Top quality oils and chemicals from famous organisations paraffins to ensure instant starting and improved performance. like Esso Petroleum Ltd. and I.C.I. Ltd. make the A pint 3/- I pint 5/- perfect blend . . . the perfect fuel for all your engines. Quickstart Diesel Fuel Get a can of Quickstart Fuel from your Λ balanced blend of quality oils local Model Shop NOW. You'll be amazed and a special additive at the improved performance it brings! bring easy starting, smooth running and sparkling performance Ready to use — in k pint (10 oz.) and I pint (20 oz.) to every diesel engine. 1 pint 3/- I pint 5/- cans — complete with 3-inch spouts

For all that’s best in power flying

D AVIES-CHARLTON LIMITED

Hll.LS MEADOW DOUGLAS ISLE OI: MAN

Trade supplies are available through Messrs. .4. .4. Hales Limited. 26 Station Close, Potters Par, Middlesex February, I960 57 \m m THESE KITS

Fit./Lieut. M. F. Hawkins holding his Keilkraft SPECTRE, with which he won the Control Line Stunt Contest at the Tenth United Kingdom Royal Air Force Model Aircraft Championships — held at Debden Aerodrome, Essex, on the 26th and 27th September, 1959.

SPECTRE The Spectre is a 4Γ span Stunt Model for engines from 2.5 to 3.5 c.c. A De Luxe kit containing die-cut parts for quick and easy building. ΟΙ/Ό

— and just read these letters praising the Keilkraft CAPRICE!

72 Bclsize Road, 12 Goodwood Crescent, Hemel Hempstead, Singlewell, H e r t s . G ra v e s e n d . D e a r S ir s , K e n t . I feel I must write to you and pass on this information D e a r S ir s , I have recently after many years started building model I am writing to thank you for putting such a good kit on aircraft again, starting with your PIPER CU B, but this is the market which is the KEILKRAFT CAPRICE, which I not the model in question. would recommend to any future modellers. I purchased last Monday from "Henisons” of Hemel This model had six off the line flights which regularly Hempstead your CAPRICE GLIDER, my first ever. A f t e r turned in flights over three minutes, on the sixth one it was a week’s work and many hours sleep lost she was taken off timed for 27 minutes, before it was last seen disappearing the plan last night (Saturday), doped, and balanced and left into high clouds, from which the model has not yet been till this afternoon. This being our club day for flying (Apslcy recovered. This performance can be verified by several Aero Model Club). members of the North Kent "Nomads”. On arriving at our field she was assembled and launched Thanking you once again for this superb model. on a straight glide for a distance of approx. 20 yards, no Yours faithfully, trimming or alteration being necessary at all. W e then at R. RENNELL. 2.55 p.m. launched her on the line. She was set with a one- minute D.T. Three other club members set watches on her and at 5-to-4 clocked off. W e followed by car for about six m iles and lost sight through the twisting lanes. It was then still going strong in the vicinity of St. Albans. Although disappointed and a little sad, being first flight, CAPRICE I feel I must say my confidence and praise to you on the S I ' span Contest design and quality of your kits. Here’s hoping for a speedy Glider. Kit con­ return of one said "CAPRICE”, lost out of sight and still tains all die-cut going this Sunday. parts. | 5 9 My thanks again for your first class kits. I re m a in , Yours sincerely, BRIAN R. ENGLAND.

If PERFORMANCE counts with you···· BUY 3a3Qjiaoa 58 February, I960

ME 109 MESSERSCHMITT This famous German fighter of World War 11 gained tremendous respect from the Allies as a first class interceptor plane. It inflicted many losses on Allied bombers. Aurora’s model faith­ fully reproduces this aircraft. Wingspan 8 in. Length 8 in. Price 5/11. Kit No. 55.

SPAD 13 I lor speed and ability to climb made the Spad 13 a most dangerous opponent. This single seat scout See these and other great plane made its first appearance in the late summer of 19 i7. Complete Aurora Kits at your model with pilot and mechanic. Wingspan shop. Even better—send 7 in. Length 5J in. Kit No. 107. 5d. in stamps NOW for Price 3/-. the complete catalogue in full colour. It’s packed with fascinating models and interesting information. CONVAIR F-102 “ DART” Send for it right away. The F-102 is a supersonic, all weather interceptor fighter designed for day and night use. Its speed at level flight is faster than sound. Wingspan 3) in. Length 6J in. Price 2/-. Kit No. 290.

AURORA AIRCRAFT FROM 2/-; SHIPS FROM 6/11; KNIGHTS FROM 7/11; ARMY EQUIPMENT FROM 6/1 NATIONAL FIGURES FROM 6/11.

Post this coupon today for your Aurora Catalogue. Please send me the new full colour Aurora Catalogue for 'which I enclose 5d. in stamps. Name Address

PLAYCRAFT TOYS LTD ., DEPT. E 120 M 00RGATE, LONDON. E.C.2

Kindly mention AEROM ODELLER when replying to advertisers February, I960 59

7.00 p.m. With everything prepared. John Arnold of Hampshire is ready for his attempt to *'beat-the-clock".

Cum 'BEAT THE c l o c k COMPETITION !

7.15 p.m. W ith beams drilled and bolts located, f e e N e t r m o n t h ? A wing and fuselage halves cemented together. FOR FULL DETAILS OF THIS GREAT CONTEST

7.32 p.m. All tail surfaces fixed, tape hinges prepared, he locates the fulcrum.

Exploded view shows Just how easy the Designers have made it for you! Wing has finished aerofoil section—hole drilled for fulcrum—fully shaped, hollowed and slotted fuselage halves— ready located hardwood motor beams— Under carnage ready- to-fit complete with sorbo wheels—All necessary wire and hardware parts—Bright checker transfers for decor. Suitable for ·5 to 1-49 c.c. Diesel or Glow motors, with integral tanks—You just bolt the motor in place, that’s all!

P r ic e 2 7 6

8.5 p.m. Controls connected, model complete— For full details of this super competition he’s taken just over the hour. Can YOU beat this ask your “ Veron” dealer for leaflet or time! See next month’s ‘•Aeromodeller“ o r ask S.A.E. to us. your ’’Veron” dealer for details.

J MODEL AIRCRAFT (Bournemouth) LTD. p o p u j£ fL / NORWOOD MADU/nnn PLACEm ore ·. BOURNEMOUTHnniiotic m o i i t u .· HANTSu a u t c w o r l d . Telephone: BOURNEMOUTH 43061· WHOLESALE ONLY

Kindly mention AER O M O D E LLER when replying to advertisers '»\;3 : j cj m m m 60 February. I960

Just like the real thing! Airfix kits are not just models — they’re exact replicas, each series to a constant scale.

Photograph by permission o f Croup Captain J, £ . Johnson, D.S.O.. D.f.C.

Airfix I 72nd scale SpitfireM kIX. 2 /.

There are models galore in the Airfix range! Aircraft from fighters to bombers (all to the same I /72nd scale), 00 gauge railway accessories, vintage cars, historical ships. Airfix ralue is unbeatable — isk your dealer for the latest list. Nearly 100 kits from 2/- to IO/6d.

STOP PRESS! THE WORLD S GREATEST VALUE IN CONSTRUCTION KITS Latest Airfix Production From Model and Hobby Shops, Toy Shops and F. W. Woolworth

VINTAGE CARS TRACKSIDE SERIES 1930 Bentley 2/- tevel Crossing 2 -

JET PROVOST

MODEL I 72nd scale model of the Hunting Jet Provost FIGURES T.3 — the jet trainer now in service with the R.A.F. Wing span 6 inches. Complete with Lifeguard marking transfers and display stand, 2/- 2h A lio new: HO and 00 gauge W ater Tow er, latest addi­ HISTORICAL SHIPS tion to the Trackside Series. high, finely detailed 3/- H.M .S. Victory 2/- IA4S9J

Kindly mention AERO MO D ELLER zvhen replying to advertisers February, I960 61 mJm ALLEN-MERCURY

Since their introduction nearly five years ago Alien-Mercury engines have earned themselves an unequalled reputation for sound value, good performance, and long life. The whole range of engines can be relied on to give of their best in the hands of beginners and experts alike. In choosing an Alien-Mercury motor you are sharing in the accumulated know-how of the best team of model engine engineers in the business. CHOOSE AN ALLEN-MERCURY MOTOR FOR YOUR 1960 FLYING

Distributed by H. J. NICHOLLS (W HOLESALE) LTD. A .M . 2 5 308 Holloway Road, London, A firmly established A .M . 3 5 N .7 favourite with all classes of modellers. Without question It is a first-class tho most popular general-purpose c.c. engine engino. available today. A.M. .049 MOTOR GLO- 6 6 /5 Without doubt the best engine ever for 6 9 /6 the beginner. The easiest starting engine of all time fitted with the patented Wen-Mac Rotomatic starter. 3 9 /6 A .M . 1 5 A .M . 1 0 The ideal motor for all ±A contests where The A.M. I0 is now firmly established as the utmost output is required from I.Sc.c. the world's best Ic.c. d iesel. 5 7 / 1 0 5 6 /8

Export enquiries : Courtney Reed Export Ltd. 4 Brabant Court, Philpot Lane, E.C.3

1.5 vo lt glow- 2 volt short reach 2 volt long reach plug for small plug for all glow plug for the engines up to motors from 2.5 larger glowplug .049 cu. in. (0.8 motors. The c.c. to I0 c.c. c.c.) capacity. ultimate choice capacity. Charac­ Th e ideal plug for all racing for the popular teristics are long glowplug motors small American life with easy motors now be­ w ith the clem ent starting. The ing imported and that will really especially reco­ ideal “ standard" stand up to the mmended for plug for all short most rigorous the new A.M.049 reach motors. flying conditions.

ALL’ A.M. GLOWPLUGS HAVE THE EXCLUSIVE A.M. ELEMENT WHICH GIVESjREALLY EASY STARTING WITH LONG LIFE

28, INGEL FICTORY COLONY, INGEL RD., N.18. • J. ALLEN ENGINEERING LTD. Phone : EDMONTON 6466 [M[OjO:E L"L»E Π] 62 February, I960

FAIREY ROTODYNE 358P I/72nd scale I5in.diam. rotor span. A wonderful model of this unique vertical- lift airliner. Has detailed cockpit, retractable steps, clear cabin windows, full set of transfers, paint and cement, detailed instructions. Price 12s. 6d.

BRISTOL BLOODHOUND 344P No collection is complete without this super model of this anti-aircraft defence weapon. Model is I3£ in. high and has working elevating mechanism. Kit has 125 parts moulded in true colours, crew of four: set of transfers, cement and detailed instructions. Price 12s. 6d.

TWIN FORTY IM A 55 Anti-aircraft Tank. One of seven super models in the Frog De Luxe Series of Army Ordnance Kits. These are wonderfully detailed models with many working features, including flexible caterpillar tracks and sprung wheels. Kit includes crew members, transfers and detailed instructions. Price 12s. 6d.

Other models in the series are: Big Shot Howitzer 17s. Atomic Cannon 36s. 6d. Nike Guided Missile 8s. 9d. Skysweepor A.A. Gun 9s. 3d. Walker Bulldog Tank 12s. 6d. Ontos Light Tank 7s. I Id.

The Large range of FROG Plastic Models include: I/96th scale Airliners and "V " Bombers. l/72nd FROG BRISTOL BLOODHOUND 344P. scale Fighters and W .W .I I series.

Royal Navy Ship “Battle” Class Destroyer 14 in. long. Price 8s. 6d.

SCALE PLASTIC MODELS Made in England by INTERNATIONAL MODEL AIRCRAFT LTD., MORDEN ROAD, MERTON, S.W.I9

Kindly mention AEROMODELLER when replying to advertisers ) Going to the top? CRANWELL '['RAINS LEADERS

What makes a man fit for high command ? What are the qualities in a young man which mark him as one who could go right to the top? And where will such a young man get the finest chance? The Royal Air Force College. Cranwcll. defence rests. This is a solemn charge, and is today training the men from whose demands exceptional men. ranks many of the high commanders of A CHALLENGE TO YOU tomorrow will be chosen. Most cadets at Cranwcll trains a small nucleus of the Cranwcll learn to fly and train for top R.A.F.’s permanent officers, and a operational posts. Some study for the cadetship there is not lightly given. Equipment and Secretarial branches, Exacting standards of fitness, education leading to senior appointments in logistics and character are demanded. If you can or administration. All receive an educa­ meet them, the R.A.F. is ready to welcome Flying jets at 19. Cadets entering Cranwell tion on university lines. you. in return it oilers a stimulating life, now will start their flying on Jet Provosts, What are the rewards that go with a where technical skills and global strategy the latest ab initio jet trainer. permanent R.*A.F. Commission? Every are married with traditional concepts of Cranwcll cadet can rise as high as his personal courage and leadership. ability will take him. Materially, he’ll requirements : You must be 1 7 A -1 9 J. enjoy life on a scale few civil careers can and cither have passed G.C.E. at ad­ match. At 26, a Flight Lieutenant on fly­ vanced level or (until October 1 9 6 0 ) the ing duties can be earning, with full allow­ Civil Service Commission written ances, £1,700. An R.A.F. officer travels examination. the world, lives hard, lives well. You’ll ft.A.F. SCHOLARSHIPS not find one who would willingly change These are available for boys in the U.K. his career. over 15 years 8 months to help them stay THE R.A.F. OF THE FUTURE at school until educationally qualified to enter Cranwell. Scholarships are tax free, In its 40 years, the R.A.F. has never had and arc paid irrespective of family income. a more vital role to play than today. Most l or details of entry to Cranwell and of new developments in warfare — in defence R.A.F. Scholarships write to the Under University of the Air. Today they are cadets or attack — concern the air more vitally Secretary of State, Air Ministry (M.9) eagerly grasping every opportunity for de­ than any other sphere. Look as far ahead (A.M.17), Adastral House, London, velopment . . . mental, physical, technical. as you will. It is on the Air Force that the W.C.l, giving date of birth and educa­ Tomorrow they will command in the Royal first responsibility for our country’s tional qualifications. Air Force o f the future. TSBBaMuaa 64 February. I960 NOW AVAILABLE IN THIS COUNTRY! AMERICA’S FAMOUS HOT FUEL PROOF

DESTRUCTIVE ELEMENTS OF GLOW FUELS

INSIGNIA RED - CHROME YELLOW - VELVET BLACK MEDIUM GREEN - ROYAL BLUE - ATLANTIC GREY WHITE - CLEAR

EUROPEAN CONCESSIONAIRES: HAMILTON MODEL SUPPLIES BENSHAM STATION GATESHEAD 8 Obtainable through your local wholesaler

Kindly mention AEROM ODELLER when replying to advertisers February, I960 65

T h e

MO * s ? S B t

______SPECIALLY DEVELOPED A.M. ■ ^ ■ E W GLOWPLUG INCLUDED new ALLOY STEEL CYLINDER NEW SUPER LIGHT PISTON for more power new REDESIGNED CRANKSHAFT for smoother running

MERCO STUNT 29

All the exclusive design features and superb workmanship which make Merco the world’s finest stunt motors

MERCO STUNT 35

Ber-r& Z CLASQ £N G /M E£ T h e I960 MERCO'S ARE AT Y O U R LOCAL STOCKIST NOW! Manufactured by: .. :·'■>. y ;..v;-y ·: Sole Distributors; ■ MODEL ENGINE RESEARCH CO. LTD., v 1A BALFOUR Μ E W S , E D Μ 0 N T 0 N, N . 9 HENRY j . NICHOLLS LTD 508 HOLLOWAY ROAD, LONDON, N.7. Teh N0^h 4272 m m m 66 February, I960

AUTOMATIC” ASSEMBLY WITH THE NEW YEOrM AN “CLIPPER” DC

DC-CUT produce a built-up model which goes LE.-v together ^automatically1*. RETAIL PRICE BLOCK SLOTTED A SHAPED FOR DIHEDRAL 6/11 DC-CUT U . DIE-CUT FLIES THREE WATS! R em em ber, built-up models fly better HAND LAUNCH! and th e " C lip p e r” it equally at home at CATAPULT! a " c h u c k " glidert for catapult launching DE-CUT ins or at a towliner. Fully pictorial plan ' SHAPED i ^ TOW-LINE! covert every atsembly stage step-by- DC-CUT TIPS SLOTTED FUSEL AGE t te p .

Simple, rugged construction with strength built right into the design without adding excess weight. The "Clipper” gives an ideal introduction LATEST ADDITION TO THE YEOMAN RANGE OF to the art of tissue covering, yet its performance and adaptability will MODERN DESIGN PREFABRICATED QUALITY KITS appeal to even the most critical of modellers.

“ QUICKBUILD” FLYING SCALE MODELS ALL BALSA CONSTRUCTION

16 SPAN r M 19 SPAN /B SPAN V I9SPAN PIPER PACER CESSNABIRDDOG D. H. PUSS MOTH AUSTER AUTOCAR Stubby, rugged model pre-decorated U.S. Army “maid of all work”, this Outstanding British lightplane of the A masterly replica of this famous in orange and blue colour scheme large model is a grand flyer. Easy 1930’s, pre-decorated in red and lightplane, pre-decoratad with and American civil markings. Kit to build, too, from fully die-cut, civil registration. Scale under­ authentic colour scheme and mark­ also includes |* / I Λ pre-decorated C / I Λ carriage for exhibition or Γ f I Λ ings. _ A large, . robust . . TRI PACER details. 3 / I U balsa parts. 3/1 1/ simpler type for flying. 3 / 1 1 / model with lots of detail. 5/10 FULLY PREFABRICATED ! PRE-DECORATED, TOO !

/p cnax/ 15 SPAN SPAN HAWKER AERONCA SEDAN GLOS. /5ΣΡ4Ν Beautifully coloured in maroon and TIGER M O TH FURY American civil registration, this is GLADIATOR World famous trainer, finished in Famous R.A.F. biplane in R.A.F. a grand model for building — and Exclusive pre-fab for easy assembly yellow colour scheme with British markings and squadron insignia. flying, too. Could take of rounded decking, civil registration. Detailed ribs, panel lines, a baby glo m otor. 5/10 cowling, etc. 6/9 An authentic scale model. 6/9 etc., and easy assembly. 6/9 TOWLINE GLIDER "QUICKIE” GLIDERS T I G E R SO" span DIXIELANDER For 2 5 - 3 5 c c X ALL _ m otors 33"span RAMBLER Superbly engineered^^^ss?^ mX High performance tawline glider. ■ ^^j^^^ySALSA ^with shaped parts, ζ ζ ^ V X . « v Designed All sheet die-cut^'5C> X -'X > jQ j· > ^ ^ Γ ΤΟρ PERFORMANCE v r \ Χ χ / j by John Chinn. FULL SIZE j f c . X TOP QUAL,TY PLAN The last word in pre-fabricated, DIXIELANDER prc-decorated designed b y^ ^ -^ C A N W IN * V V \ Semi - scole model F O R Y O U . ' ^ GEORGE FULLER Tissue covered X . Stable and realisUc built-up wing X I ' X in flight T ' ” *K , ‘ l“ ’ m box fuselage l / l l e a c h Lightweight, built-up construction is used on this model for maximum performance Assemble ready for flying In two minutes !

MANUFACTURED AND DISTRIBUTED BY A. A. HALES LTD., 26 STATION CLOSE, POTTERS BAR, MIDDLESEX February, I960 67 EWER For those who want the very best. . .

PRECISION DIE-CUT SHEET Die-cut balsa sheet is a standard feature of almost every modern kit. Besides saving time in assembly, precut parts eliminate handwork and make for greater accuracy. We are recognised as the leading authorities on die-cutting balsa sheet, unrivalled for the cleanness and accuracy obtained with even the most complex of cutter designs (and some are the most elaborate of their kind in the world). Matching colour printing, too, is another feature in which our considerable practical experience in this Field gives you a better product, better Finished and always in the Finest quality, selected Balsawood.

Modellers—and manufacturers the world over—continually endorse the consistent high quality of SOLARBO Satin Finish balsa sheet, strip, block and fabricated components. Produced by: Solarbo, Ltd., Commerce Way, Lancing, Sussex. fi 68 February, I960

NOW-BRING IT TO LIFE WITH THE HUMBROL TOUCH I

Humbrol Plastic Enamel—in 34 matching shades—gives an added touch of realism to all flying models. But that’s not the only advantage! Precise Laboratory tests have proved that Humbrol Gloss Enamel is 29% lighter than ordinary colour dope. And Gloss Humbrol (excepting metallic colours) is proof against diesel fuels—no need for an additional coat of fuel proofer. Humbrol is dry in 1 hour, and flows on easily without brushmarks. It is now being accepted more and more by discriminating modellers as today’s replacement for colour dope, the professional finish that makes so much difference. Handy \ oz. tins 8d. Sizes up to J pint.

USE BRITF1X BALSA CEMENT TOO! The established favourite with modellers. Transparent, quick drying, waterproof. Tubes from 6d.

HUMBROL The Art Enamel that turns Models into Masterpieces

THE HUMBER OIL CO. LTD. (PAINTS DIVISION) MARFLEET HULL A φ ______^ I,62 \ iinε 11 β ii I) i μp o w er β ϊ m ° d £ L

s w a n MARTIN GLIDERS 4 0 ' IN T E R ­ M ED IA TE MODEL A light­ A handsome w eight model cabin model for tow-line with a good launching performance. 0.5 — 0.87 suitable for An ideal tow- . O/A Length: flying in line trainer for unrestricted the junior modeller. MATADOR 25 3 contests. Cabin model of MARAUDER 17/2 MAGPIE conventional con­ struction for free- 65' A/2 SAILPLANE 24" BEGINNER’S To current A .2 specification flying and radio­ MODEL control. For this is a true contest A clear simple plan, machine for diesels I—2.5 c.cs. straight-forward Span: 47". O/A the advanced construction and m odeller. Length 34'.: excellent flying MENTOR capabilities make R U B B E R this a "must” for C O N T E S T all beginners. MODEL AGRESSOR T h is very popular GNOME An advanced rubber duration 32'POD AND true Delta-wing model has been BOOM MODEL design by Sqd. adopted by many Simple to build, Ldr. Laurie Clubs as the easy to trim . A Ellis, the ideal contest fine flyer to take leading designer trainer for their lots of hard of this type of less experienced knocks. The ideal model. For die­ m em bers. ” follow-on" to the Magpit sels of 0.5—0.87 c.cs. and has phenomenal STANDARD 57/6 flight character­ CONTROL-LINE SCALE DE-LUXE 73/6 istics. LOCKHEED LIGHTNING P38J CONTROL-LINE STUNT-COMBAT The LIGHTNING is the ultimate in kit production and is without MARVIN 19 3 A stunt model for a question the most prefabricated kit in the Mercury range. The deluxe I c.c engine that will go "right kit contains scale type wheels, through the book" tank and spinners as well as die-cut when fitted with bal*a and ply. the AM 10. Coupled flaps and elevators. W in g area: 175 sq. in . TOREADOR 26 2 MUSTANG PICADOR 19 3 Fine models for the The PS I Mustang beginner to C/L flying has proved one of being really strong our most popu­ and easy to build. lar control line models and its pleasing linesand VIPER 17/6 snappy perfor­ A control line, stunt mance make it a and combat trainer, deserving favou­ which is fully acro­ MESSERSCHMITT ME 109 rite with scale batic and suitable for C/L fans. For die­ diesels I— 1.5 c.cs. It Th e Me 109 is o u r first scale C /L model sels of 2 .5 — 3.5 is simple to construct for the smaller range or AM ongi es. c.cs. with crankshaft induction. Span. 23i* this rugged model. W ith cithar the 10 or the 15 it flies well O/A length 20". Speed 65 m.p.h. approx. and has a performance like a team racer. ASX YOUR STOCKIST FOR THE LATEST FULLY ILLUSTRATED MERCURY LEAFLET

EXPORT ENQUIRIES : COURTNEY REED EXPORT LTD. 4 BRABANT COURT PHILPOT LANE. E.C.3 U B Q Q M a 70 February, I960

H o a r d a t tlio H a n g a r H o a rs

Kawker's own Hart, repainted in service colours, alas, those of the prototype Demon, poses before the Dunsfold hangars. Famous Biplanes author George Cox is so involved in study of the undercarriage, he is hard ^to see in this picture

“ Self-help”

A n n o u n c f . m f n t of the first model ’drome in Western Germany Editorial Advertisement Director Director is made in that excellent monthly Modell which is produced by D. J Laidlaw-Dickson C. S. Rushhrookc those expert modellers Hans Dieter Heck and Karl-Heinz Denzin. This new centre for model Hying has been organised by the “Helmut Editor Kermess” club at Munich-Pasing, and is situated at Puchheim, R. G. MOULTON near Furstenfeldbruck. Friedrich Trogcr and Hans Schuhmacher Editorial and Advertisement offices: have been largely responsible for the successful arrangements with 38 CLARtNI>ON ROAD. WATFORD. HERTS. officials and landowners, while the club members put in about T elephone: WATFORD 32351 (Monday-Friday) 2,000 hours of voluntary labour to clear the area and lay 4.900 concrete planks to provide a runway for the radio controllers, VOLUME XXIV measuring 23 ft. wide and 225 feet long. What did it cost? The N o. 2 9 0 FEBRUARY 1 9 6 0 figure is said to exceed 6,000 Marks, which means something around £500 in Sterling, to which a State grant in aid has contri­ CONTENTS buted 1,500 Marks, and the Puchheim Rural Council agreed to use of the land. HANGAR DOORS ...... 70 }A TEAM RACING ...... 72 What a story of enterprise! We can just imagine the Saturday H O W STARTERS STARTED ...... 74 morning shop counter pilots and hangar fliers latching onto what WORI D NEWS ...... 78 “URCHIN·* ...... 80 should be a lesson to them, and crying “Why can’t the S.M.A.E. READERS’ LETTERS...... 81 do this for us poor neglected souls?” OVER THE WAVES ...... 82 “SOPWITH PUP” ...... 84 They just do not seem to realise that they arc the S.M.A.E. when HELICOPTER DEVELOPMENTS ...... 87 they lean on the counter and shoot ofT the criticisms. Whatever PAPER MODELS ...... 88 faults there are in any Society such as that we have to govern FAMOUS BIPLANES— Hawker Hart ... 89 GADGET REVIEW ...... 94 aeromodclling in Great Britain, can be directly attributed to the ENGINE ANALYSIS—Mirco 35 96 fact that the members themselves are not playing their part by S T R O D ...... 98 actively participating in meetings that decide their future activity. ZURAD’S WAKEFIELD ...... 100 CLUB NEWS ...... 101 Of no less than 318 clubs and 7,925 members (not including the R.A.F.M.A.A.), fewer than 40 individuals, inch representatives of THE Sopwith Pup depicted by Ken McDonough is about 15 clubs attended the Society’s Annual General Meeting in engaged in the buttle for Cambrai and bears the markings of Number 46 Squadron, Royal Flying London on December 6th. This smattering of the possible attendance, Corps. had a strong free-lfight majority so that in the all-important general AEROMODLLLER Incorporates Lhc MODEL discussion on Society affairs and contests, Control-line did not AEROPLANE CONSTRUCTOR and is published get more than a brief mention! monthly on the 15th of the previous month by the Yet we learn of ore Area that cannot even raise more than one MODEL AERONAUTICAL PRESS LIMITED. SUBSCRIPTION RATE: (Inland) 28 ή. «Over- volunteer to establish a control-line sub-committee for 1960, and was) 27/6 per annum prepaid including the special of another Area that made no arrangements for its member-clubs Christmas Number. to use a site for the ’59 decentralised team race contests, although February, I960 71 jQBBQJLlH) it had up to half a dozen clubs with members wanting by Henry J. Nicholls, who, as Technical Secretary, to compete. The apathy astounds us. It is high time these attended the last F.A.I. meeting with Bob, as reported supposed sufferers started to think for themselves and in January issue. show their hands in voluntary organisation. Strange Next A.G.M. is to be held in Birmingham, where we isn't it, that Great Britain is about the only country in hope to sec more than a bare quorum, and a good deal all Europe without a single control-line centre. Paris, more enthusiasm for creative suggestions. Brussels, Zandvoort, Turin, Budaors, Barcelona, Mlada B ailor— Power lines Boleslav and now Puchheim arc but one centre in each of eight countries. Vet we in Britain, with perhaps the The New Zealand Electricity Department has issued a largest modelling populace have nowhere but the printed pamphlet to all modelling groups in that country. occasional use of an exposed aerodrome runway for It warns control-line fliers of the dangers of flying close any centralised meeting, and absolutely nothing in the to power lines, and has been prompted by a near-fatal way of a site worthy of the World Championships. accident to a New Zealand modeller. 6,000 such pam­ In the United States there arc several Modclports with phlets have been printed and the recommendation is that advanced facilities including rest rooms, public address one should keep a safe distance of the length of a cricket systems, floodlighting, drinking fountains and control pitch between the model and power lines. We would towers. They are exceptional examples of cases where prefer at least twice 22 yards as a safety gap: but the the right person has met the correct official department, main point is that one should FLY SAFELY and and convinced authority that provision of such a centre SENSIBLY AVOID POWER LINES. under their Department of Recreation is contributary to \en engine? the well-being of their community. Thirty cities in the What modeller is not fascinated with the prospect of U.S.A. have thus far provided the area and surfacing of a miniature Epitrochoidal engine? That is the name for circles, if not in every case so lavish as, say, the New' Ing. Felix Wankel's development at N.S.U. in Germany, Orleans example quoted above: but certainly equal to to be taken up by Curtiss-Wright in the U.S.A. A the European sites. Nor is this spirit li nited to the Triangular rotor revolves via planet gearing over a U.S.A., for in Vancouver, the Municipality granted crankshaft in the ratio of 3 : 1, thus the firing on each nine acres of forest land for a model centre, and when of its three specially shaped sides is three times per bulldozers had levelled the land, three circles, a boat revolution of the prop shaft. Imagine one of our two pond and a railway circuit plus a three story hobby strokes with the corners of a triangular crankweb centre were to be built. touching the inside face of the crankcase, a plug under As the person with most experience in model flying one bearer and exhaust/intake ports under thcothcrand centre negotiations, Willis C. Brown, who holds Α.Μ.Λ. one can appreciate the size of this new engine. N*S.U. membership No. I and is Specialist for Aviation Educa­ claim to have obtained 29 B.H.P. from a 125 c.c. version: tion in the U.S. Office of Education, can leach us a lot but how one can measure capacity on such a revolu­ in his 8-point plan for the approach to authorities. tionary project defeats us. Who'll be the first to make a 1. Leadership should be adult, strong, yet co-operative. glowplug version of this piston-less engine for which a 2. Planning should be positive, developed in writing, very great future has been forecast? enlisting aid of local businesses or organisations. 3. Self Discipline is needed to curtail flying hours, use silencers SiMTial—nr\i month and show co-operation. 4. Support must come from local Watch out for the March issue, for beside the full Recreation Officers, Parks committees, etc., attend data on our experiments w'ith electric powered frcc-flight, Council meetings and get to know local problems. 5. a superb set of drawings lor the Vickers Vanguard, a Public Relations. Guard the club reputation, not letting twin engined free-flight semi-scale airliner that flics well the unruly element spoil an opportunity. Contribute to on cither or both its -5-8 c.c. engines and loads of new the local press. Take part in displays. 6. Reliability gen to help you with your new season’s modelling, means that the club must keep its word. 7. Work hurts EVERY copy will include a FREE Control-line speed no-one, be ready for it and see the fruits of your labours calculator! ! when asked to level land, plant seed or lay the circles. 8. Cost might be as high as £300 to the Authority with subsequent maintenance charges. Co-operate to reduce this figure. Self-help, following Willis Brown's pattern should certainly be able to arrange the first British model centre since the days of Eaton Bray, that gallant failure which came before its time. Which club will be the first to make a move in such an admirable direction? Ollicial change When statistics were surprisingly announced after a secret ballot on recommendations for S.M.A.E. Fellowship, we were more than shaken to find that two of the Society's hardest worked officers were obviously not in favour with about a third of those attending the Twin engined helicop­ Annual General Meeting. We congratulate Public ters have great possi­ bilities, as will be seen Relations Officer Ken Brookes for having hurdled the by F. G. Boreham ’s opposition with a bare two-thirds majority to gain a article in this issue. well-deserved Fellowship, and commiserate with Comp. This one, by J. Norris of Denver, Colorado in Sec. Sam Mcssom for just missing an equally deserved the United States, uses honour. Same meeting also saw the departure of R. no more than a pair of F. L. “ Bob” Gosling as a Society Officer. Over many Cox Pee-Wee’s despite the large rotor dia­ years, Bob's enthusiasm to help administration has been meter of over five feet. highly valued. His place as F.A.I. delegate is now taken February, I960

Mike Bassett on 2A Team Racing

be too difficult, some experiments in props and fuel may be required—but more of that later. The things to remember before commencing on any form of competition living is that if the aim is to win, then only the best equipment and standard of building will suffice. A poorly constructed model or kinked lines

Mike and Little Warrior which can be made from scale draw­ ings at right. Functional lines make for easier building.

$A T ea m R a c in g was devised some years ago to enable juniors and others to compete in a cheaper form of competition. Two sets of rules were introduced by the Cambridge and High Wycombe Clubs, the main differences between the two being that the former used 1 c.c. motors while the latter permitted 1 -5’s. The R.A.F.M.A.A. used 0-9 c.c. as a limit with 35 sq. in. wing until 1959, and have now changed to I-5 c.c. and 55 sq. in. (For I960 they introduce the 0*9 c.c. class again, with 10 c.c. tank.—Hr>.) This class of team racing has been hovering on the fringe of competition flying for some years and it is only since last year that the S.M.A.E. has recognised it sufficiently to grant official rules and contests. The main reasons for the lack of popularity of this type of contest in the past have been— 1. Inadequacy of motors in either the 1 c.c. or 1-5 c.c. classes when the rules were first introduced. As one of the primary objects of this class was cheapness, few people were willing to buy an expensive motor for so few contests and those who did killed the competitions which were organised. 2. The reluctance of contest organisers to include yet another contest as they already had difficulty in com­ pleting the very popular “A" and **B" contests. At the Nationals it was very convenient to run these classes on different days. In view of recent rule changes both in the “A” and JA classes, $A team racing now becomes a much more attractive proposition and is particularly suitable for the person who wants to break into Team Racing. There is also now a wide selection of good motors available, with promise of more to follow.

The £A race is over five miles on 42 ft. 6 in. lines, which equals 100 laps. The model must, to win contests, be able to cover this distance in say 4 : 20 and this is the time to aim for in 1960 with the motors available. Allowing for one stop taking 20 seconds, including accelerating and decelarating, and assuming that the model travels at a constant speed throughout the tankful and ignoring the start, this means that the model must do 75 m.p.h. With two stops the models must do 90 m.p.h. Obviously the former is the better speed and lappage to aim for, and whereas the 75 m.p.h. shouldn't February, I960 73 m m m

not only often result in a broken motor, but two or three whole thing is then stuck together with a mixture of other wrecked models as well, so remember the other Balsa cement and Croid and left for at least 24 hours. fellows. A piece of i in. ply is then let into wing for mounting On choosing a motor for JA team racing the inclina­ bell-crank. Shape wing and tail, getting an accurate tion is always towards a ball race unit, although these section as shown on the plan and tapering it to a knife are not always the most powerful available, but they have edge at tips. A good section docs seem to add a few superior starting characteristics on a small prop, especially m.p.h. to the speed of the model. when hot. Of the ball race units currently available, The bottom is then built as for a normal two-part choice should lay between the EiInlander 1-5. Taifun model, the difference being that when the two parts are Hurricane, Oliver Tiger Cub Mk. I and the Oliver Tiger finished they are then glued together as an alternative sleeved down. to screws or bicycle spokes. Reason for this is, that the Now to consider the design of the model. The shape motor docs not lose so much power through vibration. of the wings and fuselage are not very important com­ pared with the correct tank/motor/prop combination, Flyins: and competition* straight tapered flying surfaces are preferred for simpli­ The first thing to remember, is that it is very rare to city. However, the following points are important: get the best performance from a model on its first flight. 1. Use as high as possible aspect ratio—8 : I is per­ The model shown did 75/78 m.p.h. for 35 laps when mitted by the rules, and such a wing is better because it first tried and was then wrecked in a line tangle at the produces less drag. Also high aspect ratio models handle first compeitition entered. An exact replica was built, better on take ofT and landing and fly better when flying the only difference being that the tank sides, having been high to overtake. pushed in to make it smaller, were straightened out and 2. Tank position. The author favours a low tank and it was made smaller by cutting a piece off the end. seems to be in the minority in so doing. Use a tank First performance of the new model was 85 m.p.h. shaped like a ten cigarette packet, which for JA should for 45 laps using a 6 x 9 prop. Further experiments were measure 4 cm. x 2J cm. x I cm. One vent only is nut in carried out on fuels and props, and performance im­ the top inside corner and a filler bottle made so that a proved to a genuine 90 m.p.h. for 55 laps using a 6 x 8 tube fits inside this vent giving room for air to escape and the best time so far recorded over five miles has been while filling—see sketch. 4 min. 5-8 secs, or an average of nearly 75 m.p.h. This 3. The Balance Point. This should be half-way be­ with a prototype Oliver Cub Mk. II. tween the pivot point and the front line which itself is Remember at all times to use good lines, on which £ in. from the leading edge. It is unthinkable to fly a double loops have been wound at both ends. Keep a free-flight model without getting the balance right and a record of performance on each prop and fuel and don’t control-line model should be carefully balanced to get change two things at once, as it is impossible to attribute the best performance. To do this without adding un­ the loss/gain in performance. Keep all your equipment necessary weight, install the controls as late as possible spotlessly clean, particularly the fuel, which should be in the construction. carefully mixed. Proportions of Amyl Nitratc/Nitrite 4. The size of the tailplane and elevator should be should be measured in a burette. All performance figures about 20-25 per cent, of the wing. This is somewhat should be taken with a stopwatch—guesses at speeds can smaller than is usually used, but a small tailplane, be surprisingly inaccurate. When timing a model, keep coupled with the balance point given above, gives good timing it throughout the run, it is no good to do 90 m.p.h. manoeuvrcability. The size of the elevator shou'd for 15 laps and then drop off to 80, the best tank position average I in. chord over half the tailplane span and be will give an almost consistent run. on the outboard side of the tailplane. The reason for In September issue ’59, Ken Long of Wharfedale this is that it helps to prevent the model turning into the gave us his useful table for the F.A.I. and Class B circle on take-off. This point is often argued, but in the Racers. Below is his latest effort on the |A class, which author’s view, application of elevator creates drag bears out Mike Bassett’s thoughts on speed and range. thereby forcing the tail of the model in towards the centre CLASS \\ (S.M.A.E.) of the circle. (Times to complete 5 miles) C’oti*tf ru c t io n Air Speed C ritical Lap Stages The pans of the model which bear strain should be a m.p.h. good fit with each other. Commence by cutting out wing 25 33| 50 100 and tail blanks. Continue with shaping fuselage top; 50 7:20 7:00 6:40 6:20 fitting wing and tail to top so that they are a good tight 52 7:07 6:47 6:27 6:07 fit; continue by cutting slots in the wings and top for 54 6:53 6:33 6:13 5:53 56 6:41 6:21 6:01 5:41 bearers so that bearers key the wing to the top. The 58 6:30 6:10 5:50 5:30 Short tail moment and high aspect ratio are obvious in this view of 60 6:20 6:00 5:40 5:20 Little Warrior 62 6:10 5:50 5:30 5:10 64 6:01 5:41 5:21 5:01 66 5:53 5:33 5:13 4:53 68 5:45 5:25 5:05 4:45 70 5:37 5:17 4:57 4:37 72 5:30 5:10 4:50 4:30 74 5:23 5:03 4:43 4:23 76 5:17 4:57 4:37 4:17 78 5:11 4:51 4:31 4:11 80 5:05 4:45 4:25 4:05 82 5:00 4:40 4:20 4:00 84 4:54 4:34 4:14 3:54 86 4:49 4:29 4:09 3:49 88 4:45 4:25 4:05 3:45 90 4:40 4:20 4:00 3:40 Constant — 5 x 60 300 (refer Sept. 59 Issue) /.Tim e *= 300 -j-mph-f (20 x number of pitstops). Critical lap No. if 5 miles = 100 laps. = _____ 100 No. of pit stops. Length o f Lines r = 42 ft. 6 in. 74 February, I960

automobile was made by Mr. Henry C. Erbc and was particularly suited to the “Τ'* type Fords. This is illustrated in Figure I. The inventor used a spring motor rather like an oversized clock spring which could be wound by means of a crank extending into the vehicle. Engagement of the spring-turned shaft with the engine crank shaft was effected by means of a dog clutch also controlled from within the vehicle interior. The spring was wound against a ratchet pawl. The happy motorist wound the maximum number of turns on the spring, after engaging the dog clutch and locking the crank shaft against rotation by means of the ratchet, then stepped upon the foot treadle to release the energy stored in the spring for rotation of the engine crankshaft. This principle was still popular in 1931 when Mr. Raymond P. Lancing produced a similar device for the Eclipse Aviation Corporation, a company well known in the field of automatic starters for aircraft engines. Mr. Lancing simplified matters somewhat by providing, on an extension of the crank case, an additional housing which enclosed a large coil spring again of the clock variety which could be wound through an external handle. See Figure 2. The operator pushed the starting ■ l / l 1 __ o £ by H■ tarters started F. TURNER

T en y e a r s ago, when the miniature diesel engine handle 22 inwardly towards the engine and engaged first “arrived” in this country nearly every manufacturer the smaller spur gear shown doited at 21 with the toothed laid emphasis on the easy starting characteristics of his ring on the fly wheel 16. The gear ring was retained particular product and the average purchaser regarded against reverse rotation by the spring loaded ratchet pull those characteristics as being as important as the R.P.M. 23. After applying the required number of turns the figures obtainable. Most engines of that period were of operator released the fly wheel, by movement of the the simple side port type with piston controlled induction. ratchet lever, and the rapid rotation of the shaft 7 The induction and transfer ports were suitably timed effected engagement of the jaw clutch member 9 with and dimensioned for the relatively low R.P.M. figures the end of the crank shaft. Connection of these compo­ developed and since these engines swung large wooden nents was effected entirely automatically by means of the propeller, which provided excellent fly wheel effect, screw thread 8 along which the 9 moved axially due to starting was undoubtedly easy. Some examples of these its inertia. early designs remain in production and make ideal beginners’ engines even though during the intervening years their performance has been improved by minor modification beyond that of their forebearers. The Mills 1*3 Mk 11 is a classic example. But to-day even the most modest of the small capacity engines cither diesel or glow employs “advanced” timing and demands a certain amount of knack from its operator particularly when suitably loaded for the high R.P.M. of which they arc capable. On plastic propellers of small diameter they can be quite tricky to start and they have contributed a new vocabulary into the testers* reports; they arc reputed to have “ bite”, they snap on light propellers, and. according to the type of induction valve employed, occasionally exhibit a tendency to reverse themselves. Yet the small capacity rotary or reed valve engine is rapidly increasing in popularity due partly to the low initial cost and partly to the introduction of “automatic” starting aids. These starters have been popular in the U.S.A. for some years but until recently were novelty items to the British modeller. Now we have two manufacturers currently producing small capacity engines with spring-recoil type starters. It is interesting therefore, to take a look at some of the inventions which have preceded the now accepted spring type starter. In the early 20’s many attempts were being made to provide spring starters for aircraft and motor vehicle engines. One early invention applied to the American February, I960 75 m m m

2 part 20 is pulled away to extend the intervening band. On release of the airscrew the energy stored in the stretched band affords rapid rotation of the screw. The writer has tried this device and finds that, although it has limitations, it is surprisingly effective particularly on engines of relatively low compression ratios. Now in Figure 5 we come to a slightly more complex arrangement which is similar to the Throscl invention in so far as it is a hand held device which is not carried by the power plant as was the case in previous inventions. This device again depends upon the storage of energy within a spring: the spring 9 is contained within a hand held tube or cylinder 2 and it includes a “free wheel” device to prevent damage to the air screw blades when ignition has been effected. Winding of the spring is effected by rotating the cylinder about the central shaft while a ratchet or spring lock device prevents inadvertant rotation. This is released by means of the trigger like projection, 13. Devices of this general character were available in the United Kingdom in pre-war days and references can be found to them in various publications notably D. A. Russell's book on “The Design and The early 1940’s saw, in America, increased popularity Construction of Model Aircraft”. for the use of small internal combustion engines foi driving miniature electricity generating plants and lawn mowers, etc. and there appeared a crop of automatic starting devices specially introduced for “domestic*’ operation. Perhaps the most significant of these was the recoil starter invented by William F. Krenzke. Here the starting impetus was provided by means of a pull-cord wound on to a pulley. A flat spring, again of the clock spring variety, was employed to effect rewinding of the drum and the pull cord while the transmission between the starter device and the engine crank shaft was by means of a clutch in which a number of balls were positioned in suitable grooves so that any one of the balls could act to lock the starter to the crank shaft when the Mr. Edgar T. Wcstbury was a great protagonist of starter was rotated in the operative sense. This somewhat the semi-automatic starter and favoured devices similar ingenious clutch mechanism—which is to-day manu­ to that shown in Figure 6 which is an illustration of an factured in various other guises—is shown in Figure 3. invention by a Mr. Robert H. Sager. Mr. Sager’s intention It will be seen that when the starter is at rest all of the was to provide a device in which a detachable starting balls except one will lie loosely in the peripheral pockets. cable or cord could be wound prior to starting the engine The uppermost ball will be permitted to fall into the cut without the necessity of rotating the engine flywheel away portion 21 which forms part of the starter drive during the winding operation. For this purpose he shaft. When the starter pulley, and thus the drive shaft, employed what might be called a split flywheel 3, 12 arc rotated by withdrawing the pull-cord the rotation and arranged for the two components to be engaged by causes jamming of the balls within the housing and means of a bias spring 17 and a spigot and socket affords rotation of the clutch housing 12 which is keyed connection 7 between their opposed faces. This is shown to and which rotates, the crankshaft. Similar devices quite clearly in the drawing; the free part of the flywheel are to-day in use for engines up to about 75 c.c. could be displaced to the left away from the crankshaft carried component and freely rotated to accept the starting cord. When released, the interposed coil spring (continued overleaf) Regular advl. in U.S.A. model press 10 years back

t Λ | Λ \111 W Silt I.IMfMNO r DGtIBIt S A I I I V It A H M S ^ urAat iy

STARTERS (continued from page 75) effected engagement of the wound pulley with the fly wheel proper so that they would rotate in unison when the starter cord was withdrawn. This is a device which would appear to lend itself admirably to the requirements of the boating fraternity and the devotees of the ducted fan. In 1954 we come to the first of the spring starters which bears any outward similarity to the devices now in use. This was invented by Mr. Phillip Miles de Groat of New York though similar devices have appeared in Japan and Italy. Mr. de Groat makes some interesting observations on the starling of miniature two cycle engines and has the following to say about current starting methods. In his opinion “flicking the propeller with a finger has proven to be an unsatisfactory and hazardous method in that the engine compression ordinarily precludes the starting stroke from exceeding one cycle which ordinarily is inadequate It is interesting to note that de Groat was, apparently, the first to abandon the flat clock type spring in this capacity. thus, although the hook may be stretched into engagement He preferred to use a spirally wound wire type which, with the propeller, as soon as the engine has started the to use his own words, “ is capable of absorbing a hook retracts so that it in no way intercfercs with the substantial amount of energy”. operation of the propeller. De Groat gives the required In Figure 7 the spring 11 is illustrated in connection with size of a spring as follows: “with a 054 H.P. motor opera­ a hypothetical internal combustion engine 12 having at tive at approximately 15,000 R.P.M. the starling spring least one cylinder and having a piston actuated crankshaft comprises approximately ten turns of Ό35 in. music 14, a crank case bearing housing 17 and an air screw 16. wire with an inside coil diameter of about $ in. and The torsion spring 11 includes a terminal loop 18 which weighing approximately l/IOth of an ounce”. is formed about an axis perpendicular to the axis of the Now we are rapidly approaching the modern starting coiled spring and is positioned so as to firmly engage and aids typified, in the United Kingdom at least, by the partially encircle the base of the cylinder 13. The opposite Davics-Charlton “Quickstart” shown in Figure 8. end of the spring is formed into a hook 19 adapted to be This company realised that the present trend of engaged by the propeller or other portion of the drive development in the miniature internal combustion shaft to cause the turns of the spring to become constricted engine necessitated the employment of an automatic and the spring to become energized when the shaft is spring type starter but their experiments with various rotated in a contranormal direction. The hook disengages types of energy absorbing devices lead them to favour itself automatically from the airscrew when the spring the coil type spring as typified by de Groat. There are becomes de-energized after starting of the motor and obvious disadvantages in engaging the spring with the rear face of the airscrew blades and Davies-Charlton have taken the recoil type coil spring starter a stage further in employing a cam plate interposed between the air screw and the air screw driving flange. This cam is now well-known to most readers; essentially it includes a pair of diametrically opposed hooked projections on to either of which the free end of the starter’s spring may be engaged. This of course has several advantages, the arm may be much shorter in length than if the propeller was engaged and it is important that the length of the engagement arm should not exceed the diameter of the coil otherwise it may resonate with the engine revs at some stage like a reed type tachometer and the vibration thus induced may be sufficient for the arm to engage the rear face propeller (incidentally the illustration is a deliberate indication of what happens to a starter February, I960 77

spring when it is overwound; it is important that starter springs of this nature are not turned through more than 180 deg.). Now we come to the coil type recoil spring starter’s greatest competitor, i.e. the pull-cord device and it does possess several desirable features. In the first place it is extremely neat in appearance and is relatively easy to cowl. For a ducted-fan installation it is really quite ideal. Figure 9 shows the simple mode of operation, one merely pulls the cord and obtains three or four revolu­ tions of the air screw. Upon release the cord is returned by means of the spring into the housing with the exception of course of the loop proper. It is .effective beyond doubt; its only disadvantages would appear in its complexity relative fragility and its high initial cost as compared to the coil spring recoil type. The photographed example is by the Herkimer Tool and Die Corporation while the illustration Figure 10 is of a device invented by A. C. Boultinghouse and currently manufactured by the Wen-Mac Corporation of California. Here it will be Now we have a return, almost, to the clastic band noted that the ball-clutch of Kren/ke has been substituted operated device of Η. E. Throscl. Sec Figure 12: here we by a similarly operated clutch which includes cam disc have an clastic clement 20 which might conveniently elements operable against a ring formed on the rear of be an “O" ring, fixed at one end to the crank case of the air screw driving flange. The spring is required only a miniature engine and engaged by its free end with a to return the pull-cord to its housing and is therefore, spigot—29—extended radially from behind the air screw driving disc, 28. Operation is self explanatory from the study of figure 12: one merely engages the “O” ring sufficiently to rotate the airscrew in the required clockwise direction. Just how simple can you get. We have yet to sec this device in use nor has opportunity allowed us to try it experimentally but this, surely, is the simplest of all. Opinions differ but it seems reasonable to assume that a device of this nature would be limited lo engines of fairly small capacities and the material for the “O" ring would need to be carefully selected to prevent rapid deterioration. The coil spring device has been employed upon high performance diesel engines of 2-5 c.c. and shows distinct promise in that connection, it may also prove ideal on a multi-cylinder engine where the firing order of the cylinders introduces an unusual “ feel*' to make starting appear different if not difficult. For neatness, and for lightly stressed. Rotary effort is provided entirely by the use in conditions where the rear face of the airscrew is operator via the pull cord and some restraint is required inaccessible one might favour the clock spring recoil to prevent excessive loads upon the engine mountings. type mechanism, and for ease and rapidity of operation The writer has tested the Herkimer product over a period the “pull-cord" or McRoskey type. of months and has found it wholly satisfactory but there Obviously they will each find their place (in team is quite definitely a tendency for the starter cord to racers?) am* their future employment on a large scale become frayed and it is interesting to note that the seems assured. Wen-Mac Corporation found it necessary, so far as their own product was concerned, to invent in 1956 a special device which would permit the working parts of the clutch mechanism to be accurately positioned to facilitate removal and replacement of the pull cord. Then in 1957 Messrs. McRoskey introduced a recoil spring starting device which bore some similarity to the pullstring mechanism but was in fact our old friend the flat coil energy storage spring driving with the propeller through the intermediary of the cam type clutch shown in Figure II. This particular device has been adequately described on other occasions and it is sufficient here to note that the airscrew is wound in a clock wise direction and when released the cam-plate 24 forces the cam discs 38 outwardly into engagement with the clutch ring 31 and causes this to rotate in a counter clockwise direction. The spring 32 is arranged at the rear within housing 37 which is aligned with, but separate from the clutch ring 31. This device proved likely to become as popular as the coil-spring actuated starter and is in current production in this country for installation on the A.M. 049 engine. 78 February, I960

World .\t‘\vs W hen you wtri celebrating the Northern Hemisphere New Year's Hvc did you spare a thought for our friends way down-under? New year is the time for the Australian and New Zealand National Championships, and for most of the boys it is also a hectic holiday period. In New Zealand the N.Z.M.A.A. hid a spot of bother fixing the site till fairly late in the year, and not until Alan Clarke and Walter Read could make a personal approach to the NZ Director df Aviation, and negotiate with all the powers that be, could any definite location be announced. Site was at Weedons, some 12 miles south of Christchurch on the South Island. This sounds like yet another spot of organisation with an involved background story never likely to come to light so that all the hard work can be appreciated. They have special complications in N.Z. since many visitors want field accommodation (provided, with meals at £4 17s. 6d.) and among other facilities we note offered is the arrange­ ment of holiday trips after the Nats. Processing at these Nats., for events where area specifications apply, is simplified by making each competitor provide a thin card or heavy paper template carrying outline drawings of relevant components. The New Zealand National dc-centralised team race contest resulted in a win for Auckland’s class B flier, B. Keegan with a time of 9:58.8 for ten miles and to Wellington's .1. Crombie with 8:15.5 over the same distance in class A. Fvents took place at eight centres, but only at Auckland and Christchurch was the weather reasonable, (another tip for the immigrants!). Julia Park, American wife of British modeller Bill Park, now teaching The lads at Wellington took part in the air display to in Bremen obviously knows how to handle hubby’s “ Mockturtle" A I open the city's new airport. From 12 immaculate combat glider which features a two piece wing and Jedelsky section sheet tail. and stunt models, three were salvaged after the good Below: Wolfgang Sorgel, Schuco kit production manager checks Mctz- Mecatron R C gear in his ’’Bergfalke" at Hessclberg before a S hour, deed of educating the public had been well and truly 3:11 flight. Holding model are timekeeper and helper—«η this “done" in strong wind and rain. High spot of the day ‘ M o d e lΓ photograph came when dripping pilots were ofTered a room with heaters to dry themselves off, and having divested themselves to bare essentials, with wet clothing draped over wall heaters, three women walked in! We wonder which created the better impression, the prangery or the blushery. We quoted some impressive figures in December issue for the number of entries (104) in German slope soaring events for magnet steered models. Now we hear from Switzerland of no less than 168 fliers in their contest for straight slope flying with points for distance and duration held at Homberg back in October. This four flight event was won by Peter Kurstcincr of Dubcndorf, and the companion event for flying wings was led by Paul Schmitter from an entry of 26. Fred Resin proved that age is no handicap when he won the Swiss A/2 Championships (79 flew) in rainy weather, Fred is one of the oldest modellers in the country. At the International “town" contest, Hombiarg, Saar, the Swiss contingent from Thun returned victorious with lop paces in all classes for rubber, glider and power. Homburg was the place originally rumoured lo be the site for the '59 FA I power International,—a story since proved to have little foundation. December edition of the excellent model magazine “ModeI Avia," official organ of the model organisation in Belgium carries a column from Ncry Bernard supporting the permission of team race whipping. Stating that it is not dangerous, can be used to advantage when in a difficult situation, that it demands athletic qualities, and is one of the attractions of the sport, Nery's opinion is supported by an editorial plea that a Belgian resolution go to the next F.A.I. meeting to rescind the ban decision. February, I960 79

Twins from all parts: Floyd Piorkowski and his B-2S Mitchell for two K & B Torpedo 29’s in Bill Dean picture from the U.S.A., top left. Michel Bourdouleix’s Marauder for Super Tigre 29s from Ncuilly, France. Two Barcelona enthusiasts with their Cessna 310 and Hasck's Morava C-104 from Czechoslovakia. Below: Free flight glider maestro Max Hacklinger takes to Vane Steering, a tremendously popular side of German modelling. Right, Russian team Racer by C. Matveeva uses the Mk. 12b 2 .5 c .c . diesel, and a unique UyC and planform. 80 February, I960

U rchin is the 9th of a series of open rubber models, The 1959 comp, flight average for Urchin and its the aim being to produce a design which could be flown immediate predecessor was 3 mins., and between them in a strong wind and stand a fair chance of being recovered won, out of 10 comps., six first places and three thirds. in one piece, and also be capable of a maximum time Commence the fuselage by constructing two sides, without thermal aid. and assemble them with spacers, over the plan. After The first five models were ultra-lightweights with long building up the pylon, cut away the centre of F2 and F3 fuselages and weak motors. This layout was excellent and insert horizontal cross spacers. Strengthen nose in calm air, but inconsistent in winds, and too weak. with thread binding. Cover fuselage with light Modelspan, Number Six was a smaller, sturdier model, just inside then for durability double cover from nose to rear peg. Wakefield specification, with moderate proportions and A very worthwhile modification would be to substitute a rather large tail. This proved so successful, using a warren girder spacers for the straight spacers. small prop and long pretensioned motor, that the When constructing the wing, pin down L.E. and T.E. outlines have remained unchanged to date. Urchin and laminate tips round closely spaced pins, packing up can manage 4£ mins, with 1,000 turns (90 per cent.) on laminations to conform with undercambcr. Fit the ribs, a freshly run-in Dunlop motor. Stability in all weathers then set up dihedral angles. Cement the upper spars in is perfect. A larger, slower prop would increase calm place, then remove from the board and fit the lower air performance, but would be unsafe in the usual spars. Cover with Jap tissue if available, or light Model- competition gale. span. and apply dope thinly until all pores are filled. Tailplane is built in exactly the same way, but very little dope must be used to avoid warps. Fin is detachable for easy transport. Pack up edges and insert 1/32 in x g in. ribs. Form the root over the fuselage itself, sand to a symmetrical section, at the same time reducing the top ribs to i in. maximum depth, then add the spars. Finally, dowels are added. Propeller blades are carved to shape but the root left square. Build hub and pin it to the board, packing up about $ in. Offer up the blades to the hub. using a 23 deg. pitch triangle at tips, and cut away blade roots to fit, remembering to allow for the ply facings. Bind roots with cement soaked bandage.

If any modeller deserved a Trophy for keenness in I9S9. it would have been Eddie Black, the popular flier from Glasgow who thought nothing of hitch-hiking or bicycling hundreds of miles to enter contests. Top in the A/2 trials, and a winner of many open rubber events, Eddie flies his own designs, and Urchin is a very much respected rubber job that lots of modellers will want to build. February, I960 81 EWER

URCHIN Full size copies of this I/6th y <♦»»···«* a* scale reproduction arc avail­ THE AfftOMODEUE» PLAN seRvicc able through A.P.S. as D.749, •I ··% price 5s. 6d. including post •Μ .Μ·',» Ml ··.*« ··««·« 0····**%· . .... lE X -r —A— ...J ..J - r - _ vf - ” π ιϊ V*] - - * - m n - m ςΛ . 1.- — 4 / \ ·· j J - f - s E u - i - i - r * n n :LJ. ■j i t j -w' u n — r ■—ψ ±T- — h- L « 4 * iff 1 . * w .L b t w - i r - f

f y.. Λ

\ 1 v------μ------:---- 7

Advantage of the prop stop used is that it freewheels and insert a small gusset to keep the setting. Ideal trim for case of winding, and leaves no unsupported length is a straight, sleep climb at the start of power run, of shaft to bend in a hard landing. Action is thus: slowing down almost to stall point, and going into a when power runs out, the prop freewheels until the slop shallower righthand turn. A small amount of right tail arm, which has been pulled back by the rubber band; tilt helps in windy weather. Don't be afraid to put all engages with the stop on the nose block. The blades are your strength into a fast launch. then folded back by air pressure, and held against the Remember, rubber can only be wound to 90 per cent. fuselage by light rubber bands. The stop should be bent (1,000 turns on the 50 in. motor) five or six times before so that once engaged, it cannot slip out again. it becomes too weak to give a good performance, and, Obtain a good glide from low turns, then increase the it should be properly run in before using in the model. turns, using thrust adjustments as necessary. Correct Use a dilTcrent motor for each comp, flight, or else leave for the best glide, in a righthand circle, at about 50 per a reasonable time between flights to let rubber regain cent, turns. Cement the trim tab in place when satisfied, strength.

John O'Donnell w rites.·. like to know when to hold their prizegiving dinner. D ear Sir, The latter system could well turn Into a As a result of the large and unsatisfactory retrieving contest and is liable to be won by (too late in the day) fly-offs in the 1959 the competitor with most helpers. Landing Wakefield and A 2 contests, the F.A.I. has a model in a tree (or similar happening) decided to change the “ Fly-off Rule.” In could easily eliminate a competitor. Relations future, at the conclusion of five rounds with neighbouring landowners are unlikely competitors (who have achieved all maxs) to be improved by frantic retrieving. will continue flying with a 3:00 max until Whilst it is difficult to have decisions not more than one competitor is left with a reversed. I consider that 5 flights and an perfect score. unlimited fly-off are quite satisfactory if That there are several difficulties with this flown under suitable conditions. system does not seem to have been realised. If the free flight World Championships are It appears that under the current rules and in regarded of sufficient importance to put the reasonable weather conditions. Wakefields contest requirements (and purpose) above can just, and F.A.I. Power Models can easily, organisational convenience, flights could he exceed 3:00 without thermal assistance. made under conditions where wind and This implies that more than one fly-off thermals arc least likely to be prevalent. with a 3:00 max. may be needed. There are The contest could be commenced early (as two systems of holding such fly-offs that the soon as sufficient light is available) one Contest Organisations could use. both morning and about 3 rounds flown. The continuing until a max. is not recorded:— contest would then be adjourned till evening ( 1) Fly-offs In rounds as per the contest e.g. when the last rounds would be held. The a flv-off every hour. fly-off if required should be scheduled for (2) Fly-offs without rounds l.e. as many early the following morning and should maxs as possible. 0 consist of a single flight timed toitsconclusion. “ Well — I guess the The former system puts a definite limit to A model doing 5 maxs in early morning the number of fly-offs possible before dark, and late evening conditions has demonstrated name ‘Piano W ire’ was and may need continuing the following its consistency. An unlimited fly-off held very day(s). (It should be remembered that 10 early seems the best way to show its per an inspiration” consecutive maxs have been recorded in forma nee. contests to F.A.I. Rules). This is not likely Pendleton J. O ’D onnell to be popular with Contest Organisers who Salford 6 ~V v------BASIC S/S CIRCUIT ENGINE CONTROL CIRCUIT

M any readers have asked us for details of the American application of engine speed control to the Simp11 Simul system, known in this country as Galloping Ghost. Incidentally, Simpl / Simul is a much more appropriate name for this system now that the “gallop’’ is disappearing from flying characteristics and it is high time that the original pioneers of the system received due credit in these columns. Bill Sydnor was the originator, and two flne flyers named Don Brown and Bill Gilkey did the air proving, Nathan Rambo and John Worth did their part with publicity in the Model Airplane News and A erom odeller as well as adding their own refinements. John Worth was particularly keen to obtain a system of engine speed control without compromising the reliability of the Simpl I Simul system and after running through the obvious approaches of mechanical triggering, time delay relays, etc., came up with the following which is very successful and widely used. The only disadvantage, if one may call it such, is that the half-second time delay with control surfaces held at an extreme position can result in violent reaction with, for example. Rattler. The Americans use very narrow chord elevators to minimise gallop and such disturbing reactions. Over now to John Worth : “The conventional approach to engine control with pulse systems is almost always involved with a delay relay arrangement. The idea is that so long as we pulse continuously, the delay relay contacts maintain power to the control surface actuator, but upon interruption of pulsing the relay disconnects power from the surfaces and operates an engine control device. The general assumption is that this set-up is necessary to neutralise the control surfaces during the engine change. “But the engine control can be changed with hardly any delay, either by escapement action or by initiating the action of an only slightly slower servo type of actuator. Note that the emphasis is on a trigger type of action — we need only to send the briefest signal to start the engine change going. There is no need to wait around until the change is completed. Therefore, the time interval involved can be so short as to make any neutralising of control surfaces superfluous. Many do not seem to realise that during the time delay period necessary to operate a delay relay the controls arc held full over. Since this is so, why not resume pulsing immediately upon triggering the engine control? Control surface neutralising would be so brief as to be unnecessary. “Being stuck with control surfaces that momentarily deflect full over in this type of control system, we minimise the effect by cutting the time interval to the bone — we interrupt pulsing long enough to assure that normal system operation docs not trigger the engine control, but not one bit longer. In practice, this turns out to be about half-second, since our lowest normal pulse rate is about 3 cps. If we could use a minimum pulse rate of 6 cps, the time delay coyld be cut to quarter-second, but the difference has not proved to be worth the effort. “The engine control circuit is a product of the same thinking behind the basic control system — a minimum Radio,Control glider kits arc popular in Germany. Top picture shows the Graupner "Trabant” as built and tested by the Editor. Kit tailplanc is of components to do the job desired. Usually, this type replaced by one with constant chord to avoid warps and nose is Fibreglass of circuit has used a valve normally held cut off by the reinforced pack to towhook position. A fine fast glider for towline or pulses into the grid, plus a relay which is energised when slope-soaring. Above is the Condor of A/2 site designed by Saaman with the tube conducts so as to operate the engine control Metz receiver and transmitter. New lightweight tone equipment makes possible a radio controlled !4$-©z. A/2 actuator. Frequently, the valve has been replaced by a a V2* RieM thrust The"DICE" Multi R/C m m m by R Chapman 6*dih*drol

I\>w H p p o h I

We;«W 7 M2 lbs Our advance news on the F.A.S.T. Club meeting Po*r*r K B · 45 which produced fantastic speeds at Bakersfield in California was slightly adrift, Don Mathes established an average of 110*4 m.p.h. with a McCoy 60 fitted to a standard 19 size pylon model. On a downwind pass he was actually clocked at 120 m.p.h. Five modellers beat the existing record speed. This new record now gives LARK Club members the R/C Endurance Record, the R/C Distance Record, and the new R/C Speed Record. Cnnadiin Championship low-wing multi/channel winner The only thing left for them is the altitude record! has a semi-symmetrical airfoil. Is said to be very smooth in manoeuvres with good wind penetration balances at 0 50 per cent, chord for quick response scale approx I '32 transistor. With one step further, we provide another transistor to replace the relay. Now wc are able to operate the engine control actuator directly. “The circuit evolved has several good features : it simply adds on to the basic system — nothing is changed to compromise the system’s reliability, no current is drawn except during the momentary triggering of an engine actuator, exceptional component tolerance — a wide variety of diodes, capacitors and transistors have been used. The main requirement is that the second stage transistor has a rating sufficient to drive the actuator. Practically any power transistor will do; a minimum collector rating of 6 v. and I amp is common in the cheapest of these and this is ample for practically any actuator. “As shown, the circuit uses PNP transistors and it is necessary that all polarities be correct. To tailor the circuit to any system it is only necessary to vary the values of C and R to obtain the time delay desired. Starting with R at about 25K and with an ammeter in the circuit at X2, vary R to get the desired current through the escapement or other actuator. Then, with the circuit pulsing at its lowest normal rate and the pulse width at its normal maximum on the signal oif side (stick full back and over), vary C to just hold the actuator inactive. These instructions arc brief — but for those who care to get the full procedure, complete details were published in the M ay-June, 1959, issue of Grid Leaks by Ace Radio Control, Box 301, Higginsville, Missouri, U.S.A.”

Drawing at left is of the German Pusher Delta by Gunther Schmidt, known as the '•Titan". Radio equipment is Tcko, made locally in Bremen and the young lady is known as Mrs. Radio Control of Bremen ! Above are pictures of P. E. Norman's remarkable ducted fan R,C models mentioned last month in “ Model News” . Top view shows the Fox IS installation with the receiver below cockpit (6 volt by Norman Kite) and pack of Deac 100 cells behind the cockpit canopy. Actuat-r in all cases is rubber-driven F. Rising with miniature pencells mounted in fin. Models are ap pro xi­ mately 36-in. span, 350 sq. in ., Fox version weighs 31 ox. February, I960

lie* lo drnuinu; ► UtUMb kOJt c

, 7 2 n d M r t l f d r l i i l U

A superb one-tvelfth scale free-fliglil model S o p w illi 1*1111

T mc Sopwvth Pup has been described as the "perfect the increasingly popular -5 to -8 CC. engine t i n fills the flvtng machine" and its simple clawxal lines tear eloquent APS range admirably. Construction clorel) follows that desig ed for ·5 - ·8 c.c. testimony to its outstanding qualities. During ...... - of the actual aircraft and Ken MvDcrough's own career as a lighting scout on the Western hronl both in cutaway drawing is a grard aid lo asscirhly. by K nneth McDonough (who alto painted the cover) the R.N..A.S. and R.F.C. ilxr Pup proved its worth in * Fuselage side frame» are constructed o'er the plan should he bound only to the bamboo connecting; rod variety o f duties. fust and the ftont ihtoe hays then blltd in with 4 in. and at th e n s re and oditiued fore and afi before rcrm arcniiv No less than 1,720 Pups were built and interesting 1)16 in. sheet together with Ihe very hard halta j in. sheet cementing when ihe aiifraire is complete The addition variants included some uung skid undercarriages with leel pieces uuh slois (or the lower wing tor-rie*- TH: o f fom cis c.'s uruix, stringers, undercarriage lute* and an arrester hook for evirh carrier dsck operation. Its 1 in. mj. I ardweed erg ire hearers arc next well sen ented sheet hsiKa fairings completes the fuselage. Metal name was never Olivia I and was said to have derived from to the frame* Particular care must he taken to ensure cowlings cut from light alloy. 20 cigarette tins and reference to it as an offspring o f Ihe bopwuh I) Strutter that the heaters are cemented at the correct downthruM attached in the appropriate locations with impact or (•inch It auMobU sit APS. pkm Ci,'651 /o r a Ί8 in. angle. Bulkheads I and I are then laminated item contact adhesive give an authentic touch. orrotvlic model, prtee I t. 6sf.) 1/16in. balsa e rd 1/16 in. ply. Bulkhead 2 is then ro u h ed The mainplanes are Quite orthodox but hard halva Another free flight power model o f the Pup to Jth and sen ented over the bearer» ard trues up ihe frrire* must be used for the leading edges und the front main- full sire scale, end suitable fer 1-1-5 c c . engine already while the crowplcee* are added. The mounting plate is spats of the lower wings. exists in Plans Service « /iSP.dOJ piice is. tel. plus 6* then eememied to the hearers and secured with cotiMcr- Keep the tail unit as light as possible, the lailplanc is post. surk screw*. Cement per.dulcm spindle hegtets in place, made integral with the elevators. These are separated Sopwitb aircraft always have been popular scale model the ferdutum avrcnhly should row he astern hied and after assembly and secured to the lailplanc with linen subjects, and this I,'l2ib scale 2*4 In. spun version for installed in ihe fuselage, the 20 SWO elevator link thread after covering. The undercarriage chassis frame sW riD unai» r»p 6»lor» m S atnr Mw rhr. (fMUvrllts lim it txttows it If salts tut is carefully soldered and faired with hard balsa. Paper «· Itw lt»«e vsslt <Π»Κ| I tiii ItsvMsss »»» ι>ι<«»; o m u l t> »«*«■" in »t« tube for the shock absorbing rubber bends should be c««*tr«Ihd m U j imfc i|

K m · d*Uil rm tli tS* 0 . v>»vO—O n fart din·I U t a d t a tft# P -v imdit (nmiKM ttrww nuH rc· will* Ih# fiitKn* fin ,-· **··!! <—»<»»»— le fNlnwl *H t 1h* lar«t. icili d i t r n f .t r j f i p « n l w » t »W«»t I»·* tlrU

Full-size copies of this I 7th scale reproduction 'of the APS Drawing are available price 6s. 6d. from Acromodeller Plans Service. Quote plan No. FSP 7S0 when ordering, and add 6d. to ccvir pest and packing February, I960

HELICOPTER DEVELOPMENTS by F. G. Boreham

R o t a r y - w in g fans may recall the last helicopter All these models had 2 bladcd rotors with hinged article in December 1958, when mention was made, and blades at a skew angle in order to obtain auto-rotation illustrations provided of experimental models powered under power off conditions. by diesel motors mounted on beams similar to jetieoptcr With the single engined powered beam, a balance practice. Fig. 1 shows the basic principle and layout. weight is essential, and in order to obtain this with less weight, I have found it advantageous to increase the distance from the rotor pivot. Mr. K. Norris a keen helicopter enthusiast from U.S.A. Denver, Colorado who has made several success­ ful P.B.R.S. models uses two Cox .020 Pee Wee engines with a 66 in. diam. 2 bladed rotor (photo above). His latest uses a 4 bladed rotor with blades and beam displaced at 60 deg., and gives promising results lifting a clockwork timer, to operate a change in the C.G., and so controls the model's flight pattern. There is no doubt, with the superior lift of the P.B.R.S. that a radio controlled model helicopter could be realised, without the complexity of clutches and gearing. On my jetticopter designs, the required blade pitch change is achieved by hinging the blades at 60 deg. usually with an initial setting of 7 deg. to 10 deg. with the blade horizontal. However, with the engine driven beam the rotor revolutions are considerably lower so the initial The powered beam rotor system (P B R.S for short) has blade pitch must be set higher 10 deg. to 15 deg. Under an advantage over the reaction type, in giving greater these conditions, a skew angle setting of 45 deg. to 50 deg. lift, and also has better auto-rotation qualities with a secures good autorotation and brings down the coning slower sinking speed due to the lower disc loading. It angle when the model descends. Fig. 2. A tapered blade will be appreciated that the rotor diam. on the P.B.R.S. is beneficial and if a parallel chord is used, some 6 deg. is much larger than the reaction type as the engine is of wash out will help to evenly distribute the lift and driving the rotor system by the beam. Also by varying prevent “sailing” of the blades due to excess tip lift. the distance of the engine unit from the rotor pivot; the gear ratio or mechanical advantage is altered. Having ReaHion type completed and tried many experimental P.B.R.S. model To revert to the reaction type model, the sketch shows the following data is submitted as a guide. an improved type hub for 3 or 4 blades which I have No. of been using with success on my Sycamore model. Figs. She o f Engine Engines Rotor Diam. Blade Chord 3 and 4. This is quite easily made, the main item is a .75 to .8 c.c. I 50 in. 3 in. .5 c.c. 2 64 in. 3 in. taper 2 in. motor oil bottle top easily obtainable from any garage. 1.46 c.c. t 60 in. 4 in. tapering 3 jn. The elastic bands of equal tension ensure good phasing Beam 1/5 to } rotor diameter. of the blades, acting as dampers under fluctuating loads and also have the advantage of preventing damage as the blades move readily on impact. It is hoped the foregoing will be helpful to spur on others to success with helicopter models. jjaaoM D 88 February, I960

ietex or even Jetex powered paper Skyhawk Bambi or Pee sits on plaster moulds with ori- 'inal plastic in Joreground Wee powered “plastics” are

possible with

this method

of papier mache

modelling by

Capt L.G.G.Smith

Paper scale models for R.T.P.

P a p i e r m a c h e acromodelling has, up to the present, paste soaked newsprint torn into small pieces, or six had a very small following. With the advent of the plastic layers of the better quality toilet paper soaked in cellulose model, the situation might change, for here in the plastic wallpaper paste can be used, giving a very light smooth kit we have the basis for powered indoor R.T.P. scale surfaced shell. For best results, the mould is first coated models. Jetcx is perhaps the best form of power for such with paste and then the shaped paper pressed into same models, due to its light weight for relatively high power. with a rolling motion of the finger-tips until the paste The great advantage of papier mache shells over soaks through and the paper is hard against the surface conventional built-up structures is in the smooth scale- of the mould. Whichever method is used the paste must like shape and surface that can be obtained, this being be given 12 hours to dty, after which the shells are removed essential with scale models of current fighters and and clear doped inside and out, the amount applied airliners. being governed by the strength/weighl requirements of Actual construction of papier mache models is partly the particular model. similar to that of plastics, having moulded shells for After trimming the shells to fit, some form of internal wings, fuselage, etc. structure, similar to that used in Jetcx “tailored” kits, General building sequence for such a model would should be designed. This need only take the form of a be as follows. Firstly, study the chosen kit with regard simple wing spar, formers, engine mount, and a keel to the amount of model to be moulded and the amount forward of the mount to brace the nose against landing to be carved from solid balsa (thin tailplanes, fins, and shocks. To obtain accurate sections for formers and solid perhaps wings). balsa wings, soft warm plasticine is pressed into the The parts selected for moulding are prepared by plastic shells and allowed to cool. Plasticine is removed removing “flash'’ and feed-marks as usual, and by and sliced vertically enabling one to draw round this filling in exhausts, intakes, cockpits, wheel-wells and shape and make templates. holes at wing and tailplane junctions with plasticine to Assemble the completed parts, fitting a cut down prevent the mould-making material (plaster of Paris) aluminium cigar tube or cooking foil rolled into a tube from Mowing into the plastic shell. to the rear fuselage, to heatproof same, assuming Jetcx Prepared shells are placed into fairly shallow boxes power is used. The assembled papier mache components (kit boxes), after having first greased the box interiors should not be sanded, but simply colour doped. with furniture polish, and balsa-cemented the edges of Cockpit canopies can be made by drawing round the the shells. Balsa cement is used as it will not affect the original on a piece of ply, removing the drawn shape, surfaces of the shells but seal them against the plaster. healing a square of acetate, mounted on the ply, in Plaster is mixed up and a sufficient amount is poured front of an electric fire, and pressing this over the original, over the shells to make the finished moulds strong enough which has been pre-greased with soap. After cooling, to withstand handling. Give the plaster 24 hours to dry. the canopy can be trimmed and cemented in place. Removal of the moulds from the boxes, and the With Jetcx power the cockpit is best left “filled in”, plastic shells from the moulds must be done with great painted matt black, as the gases can cloud the canopy. care. Interiors of moulds are greased with furniture The above form of construction is of course not polish prior to applying papier mache. The general confined to Jetcx power; Bambis and Cox Pec Wees method of making papier mache is well known but a few can power large l/48ih scale models, such as the Lindbcrg notes arc necessary for this particular application. Corsair, Sluka, Hellcat, Thunderbolt, and Winnie Pieces of paper as large as the mould are best, producing Mae, with rather stronger internal structure than that a constant smooth surface. Three layers of wallpaper described above. f

^ B m i i

The Hart prototype show* fabric wheel covers, different engine cowling at its Brook- lands test 'drome. Note race track banking in background. Bottom photo shows fuselage section at rear cockpit

Famous

B i p l a n e s No. 23

by G.A.G. COX

J u s t as the fortunes of the Dc Havilland company may the Fury a year later, this light bomber was faster than be attributed to the success of the Moth, so was the any single-seat fighter, beating the Bulldog by 12 miles Hawker aircraft company established as one of the per hour, and was highly manoeuvrable, even with its great Briiish firms on the prosperity brought by the 500 lb. bomb load. More than 500 Harts were built by Hart. This great aircraft, in company with the Fury several contractors, and it equipped 20 squadrons was the subject of unprecedented orders in the early including the famous No. 12, which was the only unit ’thirties, in fact in 1933-4 Hawkers delivered to the to fly the Faircy Fox and has ever since used the fox's services more machines than had any other company head as its emblem. since the war, and had eight types in production. In The Hart's potentialities as a fighter soon became the following year no fewer than seventeen Royal Air apparent, for as early as May 1931 an experimental Force squadrons flew Hawker types and there were more flight of"l lart Fighters" was attached to No. 23 squadron, Flawker machines in use by the Fleet Air Arm than any then flying Bulldogs. Identical with the prototype J9933, other make. Such were the qualities of the Fury, Hart these fighters had a cutaway rear cockpit to incline the and their derivatives in their heyday. Lewis gun ring and therefore improve the field of fire, These two famous aeroplanes had much in common. a long exhaust pipe on each side, and many minor They were powered by the same engine—the new Rolls changes but retained the single forward firing Vickers Royce Kestrel; the construction technique was the same gun. The experiment was a success, and the type put into in both cases, the fuselage being a steel tube structure production under the new name Demon, with two with all bolted or riveted joints; both were major com­ synchronised guns. Thus was revived the two-seat ponents of Royal Air Force strength and efficiency fighter classification which had lain dormant since the during the years preceding the expansion of 1935. Of demise of the Bristol Fighter. Early Demons mounted the two craft the Hart was the earlier by about a year, the 485 h.p. Kestrel IIS engine, but this was later replaced being designed to Spec. 12/26 and being first delivered by the 580 h.p. Kestrel V and again by the 640 h.p. to 33 squadron in 1930. Just as the Fury competed Kestrel VI. with the Faircy Firefly II in acceptance trials, so was In 1935 production of Demons was transferred to the Hart chosen in preference to the Faircy Fox ll after the new Boulton Paul factory at Wolverhampton, where comparative tests. 106 machines were built, many of them with the Frazer The Hart's performance was such an improvement on Nash hydraulic turret with its peculiar "lobster back" that of previous aircraft in its classification that it became shield for the gunner. The first airframe to be adapted the outstanding aircraft of its day. Until the arrival of to take the turret was J9933, by this time approaching veteran status. Altogether 190 Demons w'erc produced, r $ bringing the total of Harts and Demons to around the 700 mark. This took no account of the multitude of variants which followed. The second adaptation of the trusty Hart was an Army Co-operation version designed to specification 7/31, the prototype flying the same year. Named Audax, it was very similar to the Hart, retaining the horizontal gun mounting but carrying a message hook attached to the spreader bar of the undercarriage and Demon type exhaust pipes. Production of the Audax continued until 1937, when 510 had been built. With so many Hart type aeroplanes reaching the squadrons there arose the inevitable need for a trainer version. The need was supplied by Vickers and Armstrong Whitworth who between them built more than 400 machines. They (>continued on page 92) ° u «KIN I b Uh ΓΗ13 DRAW ING * ° ARE AVAILABLE PRICE I/- AND 2/- RESPECTIVELY ^ r o FROM AEROMODELLER U. - — ° -z PLANS SERVICE. PLEASE f- o ADD 6d. POSTAGt AND a: 2 QUOTE PLAN N o. 2729 < UJ X O — \\\ _.—^

[ J L io

DEM ON, 41 SQDN

KART

HART

1 I J i l i l i i k ώ ' l 1 1 x _ l j L_i r n l

HAWKER^HABfAND^ HAWKER HART {continued from page 89) HAWKER QUARTET—The Demon prototype, J9933 (compare with Hangar Doors photograph) shows long exhausts, like those on the facing Audax had a normal cockpit with windscreen for the instructor, K3079 of 4 Squadron which displays its message hook gear behind the and all but the earliest batches had long exhaust pipes undercarriage. Bottom left is a fully armed Hart, complete with reaching down below the lower leading edge as on the bombs, and for comparison. Hinds of <0 Squadron with the angled rear cockpit and “ rams horn" exhausts for the blown motor. (A e ro p .. n« Osprey. The last version of the Han trainer was fitted photograph) with a tailwhccl. Trainers were doped yellow overall but retained the polished aluminium cowlings. They were exhausts. Designed from the outset to have a tailwhccl, used by many Flying Training Schools all over the its rear cockpit was the same as the Demon's, and it country and were well liked for their good handling had slightly fatter tyres than all others except the Hardy. qualities and aerobatic performance. There were of course many internal dilferenccs which Work on the Fleet Air Arm version, the Osprey, was made the Hind a superior aeroplane to the Hart, but it carried on in parallel with production of Royal Air would be interesting to compare this biplane with light Force types. The Hart prototype, J9052 was converted bomber developments abroad at that time. The final in 1930 to meet naval requirements and was the forerunner Hart variant was the Hind Trainer, similar to the bomber of 110 seaborne fighter-reconnaissance aircraft. Although in most respects but with an instructor’s cockpit instead very similar to the land-based types, the Osprey was of a gunner’s position. extensively changed. It had a redesigned tin and rudder, Although obsolete by contemporary standards, some low swept exhausts and folding wings. It could be fitted of these biplanes were pressed into service during the with cither wheels or floats and because of the extra early years of the second war, and there are records of weight of equipment it carried, was appreciably slower such service as late as 1941. with a maximum speed of 176 m.p.h. Today one example still exists, maintained in flying In 1935 there were issued to Royal Air Force squadrons condition by its makers. This, the 13th production Hart, two more Hart adaptations. The Hardy was a general- was at one time silver with the civilian registration purpose aircraft intended for use in the Middle East. G-ABMR. Later doped dark blue with gold registration Liken Hart with Demon-type exhausts and low-pressure letters, it was used as a single-scat racing machine. “doughnut** tyres for operations from rough desert Today it is again silver with service markings and the landing grounds, the Hardy carried a great amount of historical serial J9933. It is a great pity that apari from extra equipment for its diverse duties, bringing its minor differences in the covering (the deletion of remov­ loaded weight up to 4.971 lb. Even with a 585 h.p. able panels) and engine type, the gun troughs have been Kestrel X its maximum speed was only 164 m.p.h. The faired over and the wing roundels are the wrong si/c. Hind was a day bomber replacement for the Hart. With Nevertheless, every avaiation enthusiast will he gladdened a fully supercharged Kestrel V giving 640 h.p. it was by the sight of this fine old aeroplane restored to its only 2 m.p.h. faster than the earlier machine because former glory. They are all too few. additional equipment brought the loaded weight up to The writer wishes to convey his sincere thanks to the ftawker Aircraft 5,298 lb. The Hind too. had its distinguishing features. Company and In particular to M r. Hill Bedford fo r their kind help in It was the only one of the family to have “ ram’s horn* the preparation o f this article. KEY TO DRAWING AND SKETCHPAGE 1. Radiator fully extended 15. Two Vickers guns on K 2905, there­ 2. Radiator fully retracted fore starboard panels as port . 32. Fuel gauge I 33. Priming pump 3. Metal panels on both sides on Demon 16. Red tailplane to K 2905 4. Ply. then fabric covering around 34. Starting switch 17. Solid black **12” cockpits 35. Boost pressure 5. K 2905 has red fm. Squadron badge 18. O il tank is red cross of Lorraine outlined in 19. T a il trim wheel 36. Brake pedal white, also gold crown. XLI in 20. Throttle and mixture controls 37. Radiator retracting whee black on cross 21. Petrol cock, main tank I 38. Seat adjusting lever 6. K 2905 markings shown on Hart 22. Magneto switch 39. Pyrene fire extinguisher 7. No lights on Hart 23. Altimeter 40. Mounting lugs for Vickers guns 8. Spring flap to step holes 24. A. S.l. 41. Petrol cock operating rod 9. Rudder tab on Demon only 25. Turn and bank indicator 42. D ra in plug 10. Trailing aerial lead-out tube 26. Oil pressure 43. Variable "Venetian blind" shutters 11. O il fille r cap 27. R .P .M . 44. Elastic cord to radiator counterbalance 12. Petrol filler cap 28. Petrol tank 45. Water drain pioe 13. Pilot's headrest on tubular mounting 29. Radiator temperature . 46. Universal couplings 14. Number of oil cooler elements varies 30. Oil temperature , 47. Hexagonal honeycomb all over with engine 31. Radiator retraction indicator . 48. Fabric Seam lines m February, I960 93 RUT

UAKTa^ Fiwy

FRONT

fitR Y [ΑΓίϊΓο t I I 94 February, I960

GADGET REVIEW

5 NOVEL IDEAS TO HELP the “Pole Point*’ method of enlarging drawings, the illustration shows how one can obtain three times / YOUR AREOMODELLING original fuselage proportions. A datum line is drawn through the fuselage and lines drawn from the central N e a t attachment of cowlings on certain scale models, point (“ Pole Point”) to intersect the drawing outline. has always been a problem and in past “reviews” we Distance from Pole Point to the outline is multiplied by have illustrated methods of attachment for individual the factor of enlargement, in this example, 3 (three times). types of cowl. Here is another shown in A for in-line This distance, is enlarged along the line projection, and cowlings with cylinder fairings, such as on late-mark the appropriate point marked. By drawing many such Spitfires. With this method from D. Addey of Brighton lines, compound curves etc. can be enlarged accurately the cowl is one-piece with only one vertical break line, through joining up the enlargement points. The sketch giving a neat, scale-like appearance. Use Dad's old shows a Proctor. cigar tubes (Xmas salvage!) to enter runner slots and so Mills *75 owners desiring a tank of different capacity key the nose cowl with scale realism. can make themselves one from R. Farcbrothcr’s informa­ Sketch II shows an adjustable tow hook from H. F. tion in II. A stopper from a tube of “Tyrozets" throat Wilde of Chester for small gliders. The adjustment is tablets is all that is required, the sides of which are effected by forcing the wound-on hook along a I6G pressed to eject the small blue cap. The old Mills tank wire guide. As can be seen from the sketch, an auto is removed and the new one pushed onto the tank rudder line is attached, movement being obtained by mounting, not forgetting to bend the retaining tags back pivoting the wire so that the crank acts as a limit in place. stop. Alternatively one can use the normal method of An external earth connection for fully-cowlcd glow pulling the auto-rudder line into the towing hook by motors is something that speed, scale, and team-race means of the towing ring. Also from Mr. Wilde comes a fans will appreciate. «I illustrates the simple use of a self-winding winch. Paying out the line automatically 6BA bolt, an old glow plug top soldered to it, and a hole tensions rubber strip, which in turn winds in the line in cowl wall to take bolt. Inside cowl, washers and nuts after release of the glider, the winch being planted in the retain bolt and a wire from the crankcase. This idea was ground enabling one to pursue the model immediately. sent in by R. Woodhead of Nottingham. Constructionwisc in V an old bicycle pump can form the P. S. Hurst of Edinburgh writes that summer flying tube, and the drum has a balsa core with 1/32 in. ply in the past has induced flying insects and pieces of grass sides. The winch is held under the drum, with one’s etc. into the air intake of his engine, with dire consequences. thumb controlling the speed of paying out the line. To prevent further trouble he has fitted the small device Note the little line guide detail in the sketch. A similar shown in |{ . A small piece of tinplate is bent round a idea was employed by West Essex clubman Cyril Mayes suitable object to obtain a cylinder that will fit onto the back in the early ’5()s. intake of the engine. Before fitting this cylinder, its Fitting screws and bolts into awkward corners should seam is soldered, a hole of same diameter as spraybar now be easier if one uses the simple device thought up is drilled into the cylinder wall. A small gauze of slightly by J. Roy of Edinburgh, illustrated in the self-explanatory larger diameter than intake (Jetcx 35 or 50 gauze) is sketch II. soldered onto the top, and device is then fitted to the Something for stunt control-line fliers is a sleeve intake, clamped in place by the needle valve assembly. valve vent for fuel tanks, in B. This gimmick from J. Bullock of Halifax, consists of a short length of 18 s.w.g. tube, with two drilled holes on one side to form venting holes. A sleeve of 16 s.w.g. tube slides over this, to expose only one hole at a time. The sleeve should be solder- weighted for maximum efficiency, making it slide up and down readily under gravity. Tank should be filled through a screw cap or ball-valve. A simple reservoir for a foot-pump operated Celspray unit can be made from an old circular quart size oil or Gnnk (ideal for washing down dirty models) tin. Tin should be circular for strength and safety. Convert the screw top by soldering two connections as show in B ; seams of the tin arc also soldered for extra strength. The adaptor connection goes to the sprayhead and plain connection to the footpump. When a reserve of air pressure is built up in the can, »hc Ccllspray works off a constant rather than a pulsing flow. D. A. Rattle of Brock worth, Glostcr, who provided us with this idea, also offers that shown in Ci. Called

Cyril Mayes, now in Canada, used his self-winding winch back in the early ’50s at Fairlop meetings. Goes to show there’s nothing new in Aeromodelling when H. F. Wilde submits idea “ C" in the sketch opposite! February, I960 m m 95 c a a B a o iM )

Old glow plug top 96 February, I960

Engine Analysis No. 68 by r. h . warring 1960

model MERCO

Propeller—R.P.M . Figures P ropeller dia. pilch r.p.m. 10 x 6 Frog nylon I 9 x 6 Frog nylon 8 x 4 Frog nylon 9 x 4 Frog nylon 13.500 12x4 Trucul 9.000 11x4 T rucut 11 .(XX) M aterial Specification 11x6 Trucut 9.400 D a t a Crankcase: I..M .6 light alloy die casting 10x6 Trucut 11,000 Cylinder Finer: Leaded mild steel, 10x4 Trucut 11,500 Displacement: 5*794 c.c. (*353 cu. in.) unhardened 9 x 6 Trucut 12.000 Bore: -800 in. Piston: Mcehanite 9x4 Trucul 14.200 Stroke: *703 in. Con rod: R.R.56 light alloy forging 9 x 5 Slant 13.200 Bore.· Stroke ratio: 1*14 Crankshaft: Hardened steel 9 x 4 Stunt 14.000 Bare Weight: 7| o r . Main Bearing: Phosphor-bronze bush 8 x 4 Stant 16.000 Max. Power: *55 B.H.P. at 13.400 r.p.m. Spraybar assembly: Brass 10x4 Stant 13,200 Max. Torque: 47 ounce-inches at Head: Light alloy die casting (stove 10.400 r.p.m. enamelled» Fuel used: 32J per cent. Castor 52J per Power rating: 095 B.H.P. per c.c. Propeller driver: Dural cent. Mclhanol/15 percent. Nitromcthane Power/Weight ratio: *073 B.H.P. per 02. Propeller nut: |-in. B.S.F.

B r i t i s h engine development over the past ten years or and probably beat them all as regards standard of more has been concentrated on the smaller sizes of workmanship. motors—with the notable exception of the Eta series and Of course the Merco borrows design features from the the Frog “500”, plus a strictly limited number of large top American glow motors. Some twenty years of capacity diesels. As a result the acromodcllcr who wants development work in the States has resulted in a more to fly big models—and the radio enthusiast, for whom a or less standardised layout which every new engine has 5 c.c. plus glow motor is a logical choice of power plant to follow, more or less, to stay in the top class. Trying —has cast envious eyes on overseas production models, something else just for the sake of being different must and gone to considerable length and often paid fancy almost invariably carry a performance penalty. But prices to acquire one. even following an established layout still leaves plenty Good as these foreign motors may be, they have of bugs to be ironed out and many a headache on the perhaps enjoyed a reputation of being better than they way before the design can be finalised for production. really are because of lack of “home” competition in The Merco team have come up with their own answers this field. The Merco should do much to bring the picture to these individual problems, and a fine job they appear into proper perspective by showing that a large British to have done throughout, still without having reached glow motor can be just as good as any in performance, finality. A number of modifications have been introduced February, I960 97

since the first production model, aimed to lower running —in time and reducing the vibration level to please the radio control boys, and specifically for the latter field there is a version coming with a highly developed speed control, combining a barrel throttle and exhaust slide with an airblecd setting for very slow idling. Main differences between the 1959 Merco and the I960 model are that the new model incorporates a leaded steel liner, the piston is very much lighter and slightly relieved around the top edge, and the crankshaft web has been increased in thickness to provide a heavier counterbalance. The Allen Mercury Type “C” glow plug is also recommended as standard, as giving a slightly superior performance. The 1959 Merco did, undoubtedly, need a lot of running-in time to free up properly and develop maximum performance. The I960 model should be easier in this respect. Initial stiffness of the test engine was removed in A hour's preliminary running followed by a series of diminishing propeller size runs ranging from 13x5 down to 10 x 5 and involved the eventual New accessory packs for Merco spares provide quick replacement service consumption of 30 fluid ounces of fuel. When ready for rich. The difference in performance between “minimum test report, the engine was quite free and would hold lean” and “optimum” needle settings is quite appreciable 16,000 plus r.p.m. consistently with the bearing remaining —about 1,000 r.p.m. at a load-speed circa 11,000 r.p.m. cool. or the static r.p.m. at which the Merco would most Starting characteristics arc first class. The Merco probably be operated in a model. does not like being too wet and, in fact, if generously Running was very consistent at all low speeds and primed it was found best to flick over two or three times articularly sweet at the higher speeds. The vibration before connecting the plug. Then starting was more or P*vel was inclined to be excessive at speeds of over less instantaneous. It should never give any troubles 14,000 r.p.m. This, however, is well above what would be unless there is something definitely wrong, like a burnt the normal operating speed in practice, and above the out plug. Although it has a healthy “kick”, too, it was peak r.p.m. Apart from this there was nothing that could never a vicious engine to hand start, even on small be faulted in the running characteristics. diameter propellers. A beginner could quickly learn to Performance was checked at a number of different handle the “ Merco” with confidence—if not complacency! load speeds using the A-M Type “C” plug and the old- The needle valve control is non-critical o\cr a turn or type KLG glow plug, with no measurable difference. The so but has a definite characteristic of requiring a specific manufacturers state, however, that on some engines setting for maximum performance with any propeller there is a noticeable increase in performance with the size. If the mixture is leaned right out. running still A-M plug amounting to as much as 500 r.p.m. with the remains consistent but there is a definite loss of power. same size of propeller. The A-M plug on the test engine Opening the needle from minimum lean setting progres­ was finally burnt out after a prolonged run at 17,000 sively increases the r.p.m. up to about half a turn. r.p.m. and on the basis of its time in use should provide From this optimum setting, further opening of the needle a long, useful life under all reasonable operating condi­ causes a fall in r.p.m. again as the mixture becomes too tions. {continued on page 98) 98 February, I960

Engine Analysis (com. from page 97) Maximum power, as measured with the test engine, was *55 B.H.P. at 13,400 r.p.m. using a standard methanol- castor mixture with 15 per cent, nitromcthanc. This can be regarded as an extremely good figure for a plain bearing engine'of this size, with peak power developed at a very usable r.p.m. A 12 x 3 or 11 x 4 propeller would appear the best size for free flight. Mcrco recommend a 10 x 5 propeller with wide blades for stunt and a 8 x 8 or 9 x 6 for general control line. The Merco is assembled around a very clean, beauti­ fully produced die-cast crankcase unit of substantial proportions and strength. The transfer passage is cast in on the left hand side of the cylinder with exhaust stack diametrically opposed. The unhardened steel liner is of substantial wall thickness (-9062 in. o/d for a bore of -8 in.), ground all over, except the ends. Rectangular transfer and exhaust ports, diametrically opposed, arc cut through the liner walls. The transfer overlaps the by C. Forman exhaust some 75 per cent, of its depth. The liner is an extremely good plug fit in the casting, “ S i r o d ” is a solid balsa glider designed for high held by the head fastening with six Phillips head screws. speed catapult launch to heights of 200 to 300 ft. ter­ A groove recessed in the head carries a gasket for scaling m inating w ith a long glide. against the top of the liner. Locating the gasket in this A canard layout was chosen for its excellent “arrow” manner minimises the chances of it “ blowing'’ although stability, in addition to which variable incidence of the this can still occur should the head screws work loose. foreplanc in flight was easy to arrange. This is achieved The head is completely formed as a casting and external by mounting the foreplanc on a pivot and providing it surfaces stove enamelled bright orange. with a boom which also limits its travel, the front and The piston is of cast iron, machined away to a minimum rear ends contacting the top of the fuselage to form stops wall thickness, and the lower \ in. of the piston (in a in the launch and glide positions respectively. length of *72 in.) is relieved *002 in., whilst the top edge The foreplanc is held in the glide position by a lightly is also slightly relieved. The 3/16 in. diameter floating tensioned “spring” of ·020 in. rubber shown at A on gudgeon pin is hollow and fitted with brass end pads, the plan. A lifting surface of 1/32 in. balsa is cemented while the connecting rod is a light alloy forging with to the rear end of the boom and acts as a servo elevator, plain big and little bearings. the lift from which tilts the foreplane to z.ero incidence The crankshaft is of substantial diameter (-437 in.) as the model is launched. This overcomes the spring but with a large hole through the centre (5/16 in. dia.) tension at A and as its speed falls, lift is reduced and connecting to the rectangular intake port. The shaft incidence restored by the spring. steps down abruptly to a nominal J in. diameter immedi­ Use hard straight grained stock for the fuselage and ately in front of the bearing and the front end is tapped flying surfaces, pre-cement all joints, l oreplane assembly } in. BSf for the propeller nut. A dural propeller driver must be free on its pivot and should be ballasted to is drilled with a plain hole and merely forced over the balance at the pivot point shown before finally fitting. splined length of the shaft to butt against the shoulder of Sand-paper finish the model and apply two coats of the “step”. clear dope. Prototype weighed a full A-oz. Crank web thickness is 3/16 in. and the top of the web T r i m m i n g ; cut away to provide counterbalance. The degree of With “spring” A just taut, launch fairly fast at about balance provided, incidentally, roughly counters the 60 deg. elevation using a loop of \ in. flat rubber. Climb weight of the connecting rod, leaving the piston weight should be straight until the speed falls when forcplane (i! ounce) theoretically unbalanced at T.D.C. Crank pin should change to glide position denoted by sudden diameter is 7/32 in. The shaft is hardened and ground climb. If model dives, increase tension at A by pulling over the journal surfaces and the crankpin. It runs in a ends of rubber further through. drawn bronze bush, cast integral with the crankcase, Adjust glide trim by sanding rear end of boom to drilled, reamed and honed to size. The bearing fit and increase angle of attack to decrease it cement packing hearing surface were very tine indeed. to top of fuselage. Both the spraybar and the needle thimble arc of brass, the latter large in size and convenient to handle. As Pivoting "pick-a-back" plane controls STR0D, here in climb setting supplied, the needle is mounted on the right hand of the choke tube—the “hot” side of the engine since the exhaust stack faces this way. It is more convenient— and certainly more comfortable to reassemble the spraybar with the needle on the left, unless the model layout makes this too awkward. Summarising, the Merco “35” looks a good engine (with its cleanly finished, vapour-blasted crankcase), and it is a good engine; powerful, consistent and easy to handle. It is also remarkably good value for money for the workmanship throughout is really first class in the best British tradition. Perhaps, as it proves its worth on the flying field, we shall hear less enthusiasm for the “superiority” of big foreign glow motors. This is a British engine with the potential to show otherwise! JLiJS *K* * K * B ■EKT1NG SLOTSINTO IN THREAP h s u b CN PIVOT BEFORE CEM- S FORE PLANE P1YCT 13 S.W- 0. PIANO f OPTIONAL f TRIM ο TAB.IN. f Βλψ< FORE PLANE P1YCT13 S.W-0. PIANO titch (2 OFF)MOUNT(2 GROOVEFUSELAGE

FORE PLANE th it w

thread

1 ilN

. cement to FIT PLUSH FIT ANJ)

E Z I S - F L A H : E L A C S TILLER MADE FROM PIN- on

side FOREPLANE IDENTICAL F L A T B O T T O M N O D I H E D R A L ED OSD FR6D TURN 6UDB FOR TOSIDE BEND

cheeks *· CI ETN! GIE SETTING) (GLIDE SETTING! B (CLIM IOTN FORE PLANE N A L P E R O F TING PIVO ON MAIN PI ANE CANARD . SPRINGLOAFED FOR GLIDE TRIM ------IG PRE TAP$ P A T (PARCEL HINGE 9 ■ $ IN. CATAPULT

I in SERVO BOOM TWO LAMINAIIOHS >/)2lN BILK ORTISSUE. FORE PLANE N i2 IN BALSA. IN i2 N FOREPLANE SERVO ELEVATOR. SERVO MAM MAM PLANE BALSAP/Si IN HOLE FILLED WITH ClM EMI AND KITH s/ltoIN-BALSA FUSELAGE TIP FIN?.VJZ IN. BALSA. BALSA H BALLAST. COVER WITH SILK. VlioIN PIVOT SLOTS COVERPIVOT SLOTS WITH SILK OR TISSVE PIN. VitoJN BALSA. COVERED WITH SILK. ook A o lo $ elevator ide TENSION fPRING s

cheeks . w . o

. mass .

balance C OVERWITH

PS ED OF END PASS ELASTIC2 THRO' PASS NEEDLE1 THROUGH HOLE

SAME TO FORMLOOP. LOOP AND TAUGHT. PULL A

d n

n r u t e r

through LEAVE FOR DIUSTMENT Ttf 2>

100 February, I960

Κ ι · γ : η Ι \ 1V » k < ‘li<‘M motor hooks. Sixteen strands of 6 by 1 mm. Pirelli give a 40-sec. I t t a k e s a t o p quality model/ modeller combination to consistently motor run. The front fuselage is place so high in Wakefield events as built up with eight ^ in. by * in. has Stanislaw Zurad of Poland with balsa planks, cleverly overlapped his hinged fuselage designs. In 1958 and sanded to provide an elliptical he came through the tough fifth section with thin but strong walls. round to place second in the World The rear fuselage is carved from soft Championship. Last year in France balsa and hollowed as much as he was one of the fly-οίΤ men at possible for lightness and it is equal First placing, but eventually arranged to hinge downwards for wound up fourth on a sixth flight motor access. At the nose, the shaft time of 3 : 50. runs in a double ball race assembly Zurad does not confine his and a fabricated yoke carries the abilities to a high standard of bobbin with rubber flanges. modelling, using many unique and Two-piece wings join at the centre ingenious ideas in the process; but section on an alloy longue, and are he also reg ilarly contributes finely then fitted to a bamboo and wire produced sketches for the Polish cradle, parasol mounting on the model press as example at right. fuselage. In this respect and in the The plan for his Wakefield reveals fuselage, perhaps Zurad has been its enormous tail moment, and influenced by Bond Baker's fine relatively short distance between model which beat him in 1958.

Who said it was an “Inexpensive” hobby February, I960 ΙΟΙ a CLUB NEWS d o n’t received. They would like to air one grievance — since no properly organised FORGET! competition for the Area Centralised Indoor Nationals Control/Line competition was arranged by Corn Exchange, the London Area they ran a competition Manchester. at our local flying ground and hopefully Feb. 13/14. submitted times — they were returned, of course. They do not blame the S.M.A.E. Comp. See., he wus only tloing his job; but had times been accepted wc would have had a 1st and 2nd place in the F.A.I. team race Members of Napier/ and a 1st and 2nd in the £A. This club did English Electric Club attempt to find a suitable flying ground and at Luton with sam­ organise a competition, but could not do ples of their Indoor the impossible within the time. They do flying activity. Docs feel most strongly that it is not good enough your club have regu­ for an area as large as London to be lar meetings for dependent upon competitions organised by round the pole flying ? other Areas. Sidcup are quite willing to lend a hand. On Monday, December 6th, KENTON M.A.C.'. had a combat comp, with North- Who would like a trip by air, with to Davidstowe. Cornwall, if this is not wood club at Northwick Park as mentioned .1 seven-day stop-over in Switzerland for a suitable, it will be held at Winklcleigh as above. Both clubs arc improving, combat hotel and fare cost provisionally set at £30? will be the June meeting, July. September, techniques and flying skill. Together with That's the ‘‘feeler” I’ve received from one October meetings will be held at the new site Northwood they hope next season to very ardent R,C enthusiast who would like near Totncs. Devon, whilst the August venue organise a rally for combat only, probably to fix a chartered trip for those who want to will be the Devon Rally at Woodbury Com­ at Northwick Park — unless anyone has sec the World Radio Control Championships mon. near Exeter. any better ideas? A. Ciipstonc has just in late July. Scheme depends entirely on the Enquiries for membership should be made acquired a 3-ft. pulse jet much to the annoy­ acceptance of the party by Swiss authorities to Mr. H. Stillings. Hon, Sec.. 5 Woolsery ance of the unappreciative neighbourhood. — for the ‘drome to be used for the contest Grove. Whipton. Exeter. Devon. Team-race enthusiasm is growing fast, two is likely to be military. Still, there's nothing Eta 29 Mk. Vis arc already howling and like preparing early, and interested parties W e s te rn some others are on order, not to mention arc advised to contact Ed Johnson at Owing to the customary’ lack of flying the dozens of Olivers. The Stores. Larkhill, Wilts. space in and around Bristol, the majority NORTHWOOD M.A.C. held a very of SOUTH BRISTOL M.A.C.’s activities successful exhibition on November 27th North Westons arc centred on control line in particular which prompted a full page report in the Area A.G.M. and Dinner in Bolton on Team Race and Stunt. F-F Comp. Sec. has local newspapers. To climax a successful November 28th found a dearth of volunteers organised a number of contests suitable for season, the combat boys just beat Kenton for the post of Contest Secretary and only •8 c.c. sport models, these include a scramble, M.A.C. three to two in a friendly competition. Sid Lawton offering his services for a C L nomination, and scale contest. Both clubs would like to accept challenges Committee. Joe Chadwick has retired from Bob Bishop set a new club speed record from other clubs in the area. New club being Comp. Sec. over the past four years of 103 m.p.h. using a P. A.W.-powered F.A.I. combat champion is Pete Perry. and deserves a break, but where, oh where, team racer. All weather stunt model con­ Owing to CRYSTAL PALACE’S rapid is the enthusiasm we once admired in this structed by Brian Hopkins, incorporates a rise in new members negotiations arc in area? Without a committee, C/Liners cannot diamond wing section and adjustable engine progress for larger premises. (Local council expect to have any events organised for them offset, showed great promise. are most helpful). Weekend flying takes this season, and to have the dinner in Bolton M id la n d place at Epsom and Mitcham. Winter with NO Bolton clubsters to enjoy the fun programme contains plastic kit comps, for and games, seems more than disloyal. BRIDGNORTH M.C. is a newly-formed juniors and an AI comp, for early new year. WIGAN M.A.C. should be represented in club meeting in the canteen of a local Scale models arc already in evidence for the Radio C ontrol sphere this season. The laundry. Membership is increasing so quickly next years Nats, and a substantial number Rootes trophy as well as the English Electric that they plan to move to larger premises. of models have been entered for the M.E. arc on their shelf for the second year running. Many local fields suitable for control line exhibition. The club wishes to express that New year is to open with the club comp, in flying, particularly Highgate Common for it exists for the benefit of ‘‘Sport Fliers” January, to provide contests for club members free flight. rather than the ardent, over enthusiast only. A film show is also planned for the OUTLAWS (CANNOCK) M.A.C.’» “pot-hunter” . early part of the year, and from tliesc and second Annual Dinner held recently was other activities it in hoped to awaken more again very successful. Trophies lor the year’s N o r t h e r n of the club to the effort that the free flight champions were awarded. Combat J. men have indulged in to bring off a really Burkc:Stunt—E. Burke: Glider- R. Locklcy. EAST LANCS M.A.C.’* Rally is now great year. Winter activities arc well in hand, a knock­ postponed until February 28th, due to very 11ESWALL M.A.C. has a new interest out darts tournament being decided at the poor conditions experienced on the December with R. Angcll flying rubber-powered speed moment. Monthly combat comp, are also date. J. Horry made one flight on that day job in the clubroom. D. Stewart has provided well under way but interest is declining due before the fog in rubber, only to lose his a diversion from this thing with colour slides to new stunt und team race. model 1.39 O.O.S. New meeting will be at of Nats and Farnborough which was very Walton Spire Nelson. All F F classes 3 min. successful. Recent Triangular comp with L o n d o n max. 3 flights. Entry fee for December 6th Wallasey and Liverpool was literally a The first CROYDON D.M.A.C. winter w ill be held over and returned to contestants washout — it poured ! ! contest was for Λ/2 at Chobham. December who cannot attend on the new date. Pre LIVERPOOL AND D.M.A.C. has com­ 13th. Twenty lads turned up and braved fog entries Is. 6d. and Is. to Mr. L. Clorhin, menced Us winter programme of indoor and rain to put up some fair times. John 19. Fair View Road, Burnley. activities, starting with u film show at their Blount came out top flying a Nebula — WHARFEDALE Club members are at last meeting. They intend to have round the 10 :03 for live flights, closely followed by present engaged in design and construction pole flying, and next meeting a lecture by Messrs. North and Wisher; in spite of poor of next season’s T R and F F entries. Many a C L expert from Australia, Bernie Shanks. conditions first ten all scored over nine new ideas under development, including Italian member Joe Savini is welcomed back minutes. The club wishes to thank all who delta and flying wing F.A.I. team racers. from his annual holiday in Italy. Whilst there helped. Next contest planned is Wakefield A new club room of greater vdlume and he entered F.A.I. contests and gained a on January 31st at Chobham. Five 3's, bring unlimited curfew hours has been secured for couple of places. your own timekeepers; 2s. 6d. entry; winner club use; members will now have the added takes the lot. pleasure of indoor flying and film shows. Mouth HVsteru Interest in all aspects of model flying has Club now meets at The Salem School SOUTH WESTERN RADIO CONTROL increased in SIDCUP A.C. during recent rooms Bumley-in-Wharfcdale, Nr. Ilklcy, M. E.S. draws its members from all over weeks and even the Team Race enthusiasts (behind the Queens Hotel) on the first Friday Devon, Cornwall and Somerset. Proposes are building gliders and power jobs to take of each month. to hold R C Rallies each month, commencing to Chobham and fly. Club meetings arc well Six members attended the Northern Area April, the first being at Winklcleigh, attended and the various talks, film shows S.M.A.E. Annual Dinner and Prizegiving N. Devon, the May venue is tentatively fixed and indoor flying comps, have been well Continued overleaf ΰ0ΒΟΜ2 102 February, I960

CLUB NEWS (continued) the only club in the country to have their scoring 1,615 points. Second was C. G. on November !4th last, where the S.M.A.E. club house on a railway platform (No. 6). Campbell, also of Montrose, with 986 D C results were announced, Richard Place Current models being built arc the A.P.S. points. taking 1st place in $A. Brian Turner, 2nd in Gamecock. Pokker, Elcctra. Turbulent, The contest results for 1959 were:— JA. John Horton 2nd in Class A and Don Dart Kitten. Austcr Λ.Ο.Ρ.9, S.E.5. Mamzelie Is/ UJR Glider. Howorth 1st in Class B, altogether 6 prizes. Elf-cat. Club is very fortunate in being able 1. A. McCallum (Arbroath) 6 min. 12 sec. to use its large Nissen Hut at any time. 2. I. Wheeler (Montrose) 5 min. 38 see. JKa«tf l n ^ l i a 2nd UIR Glider. Sitiiitli K astprn 1. D. L. Petrie (Montrose) 4 min. 12 sec. November 29th saw twenty NORWICH NORTH KENT NOMADS M.C. member­ 2. D. D. Edward (Arbroath) 3 min. 55 see. M.A.C.. members at wind and rain swept ship has continued to increase at a steady 3rd UIR Glider. R.A.F. station Marham where the R.A.F. rate. Chairman, Ray Parker, is once again 1. D. L. Petrie (Montrose) 7 min. 4 sec. modellers laid on a get together for local club champion, with Ivor Bittle. potential 2. A. McCallum (Arbroath) 7 min. fliers. Cambridge. Kings Lynn and R.A.F. number one next year. Club prizegiving and A\ Glider. Bircham Newton were well represented. dinner was well attended. President Col. 1. H. Fairweather (Arbroath) 3 min. 35 sec. Conditions which did not permit F/F and Taplin’s presence was missed but the local 2. D. D. Edward (Arbroath) 3 min. 33 see. combat restricted team race to time basis in J.P. Mr. L.iddington, and his wife kindly U R Rubber 8. a hangar. Highlight of the day was U.S.A.F. presented the prizes. 1. C. M. Christie (Bucksbown) 9 min. Capt. T. Rogenski's eight channel “Explorer” At the A.G.M. of the EASTBOURNE 2. D. L. Petrie (Montrose) 8 min. 8 sec. which flew the book from takc-otT to spot M.F.C. the Chairman stated that the club Next year, control-line events will be run landing. had a good year and had doubled its strength, on Saturday and Sundays throughout the and although lew Comps, were entered in season if enough interest can be aroused. S o u t h e r n the past year R. Moss (Haggis) gained F/F contests will be much the same as for REIGATE AND D.M.A.C. has now 3rd in Knokkc Trophy at Nats. Marked 1959, only more so. completed its first year of existence; and swing now is to F, F. New members welcomed its main interest lies in R C. Amongst the at Kings Drive Tennis Club rooms. Kings most successful fliers has been Frank Knowles P e n P a h whose 31 lb. low wing model, has logged Drive, Eastbourne, 7.30 p.m. Friday nights. Pen pals are required in U.S.A. by:— over 200 flights, collecting a 3rd at Cranfield Colin Miller. 20, Fanshaws Lane. Brickcndcn. and a 1st at Tangmcrc. Tim Coward flying W a le * Nr. Hertford. Herts. Age 15 (C L, all classes), a Heatwave and his O D. Mazurka won the An M.A.C. is trying to be formed at and for Michael C. Warren, 53, Tawny Surbiton Gala power event after having ΜΕΝΛΙ BRIDGE, for Anglesey modellers Avenue, Upminstcr, Essex, someone in placed 4th in the fly-off at Northern Heights. and anyone that cares to join. Amateur Europe. English speaking required, (F/F). More recent activities have included the rocketry is hoped to be a strong subject. For M. J. Wood house, 33 William Street, International Wakefield event. CARDIFF M.A.C. has hail an active Norwich, Norfolk a pen pal in Scandinavia, A member of CLACTON D.M.A.C. has season, but new members arc still welcome, corresponding in English (A 2). For William recently been experimenting with a Pec-Wee and all local enthusiasts arc invited to the Γ. Temple, 5834 S. Whipple Street, Chicago powered F/F helicopter, in his shed, and of A.G.M. at 8 p.m. on January 15th—at the 29. Illinois. U.S.A.. wants a pen pal in course the inevitable happened, but the central Y.M.C.A. (opposite Queens St. England for (speed C L). For Augustin Pec-Wee is probably still in one piece. Station). Jonnaert. Schiplackcn I. Grimbergen, Another experimenter in this club has fitted Belgium is keen on rocketry wishes to be a u ’c on both top and bottom of his C L S p o tl a m l put in touch with someone interested in model. (Gives one the pleasant choice of MONTROSE M.A.C. were the top club rocket experiments. French if possible. crash landing in either direction when in a in the Angus and District League “Strathmore Vladimir Krotii, Moskevska 48. Prague 13, vertical dive at three feet). Trophy” contests for 1959. They scored Czechoslovakia wants to contact British The first report from the BASINGSTOKE 3.828 points against Arbroath's 2,927 and modellers for exchange of Czech, Polish, A.C. has appeared. They have ten members, the Bucksburn score of 898. Top man for Russian model mags. are affiliated to the S.M.A.E. and must be the year was D. L. Petrie of Montrose T he CLUBMAN.

PROMPT MAIL ORDER SERVICE S.A.E. for Price Lists and information RADIO & ELECTRONIC PRODUCTS Trade enquiries invited. G. HONNEST-REDLICH, 44 SHEEN LANE, M0RTLAKE, S.W.I4. Telephone PROspect 9375 1 j R.E.P. TI B C O M P I BTB HANGK OF R.C. EQUIPMENT * STAR POINTS * KITS pre-tuned 20/6. "MODULA­ Complete Equipment "AEROTONE” Receiver. TOR" tone generator 38/8. Combining RANGE, RELI­ Άτ "Tone stability” Single or multi-channel "tone” "P.C." and "Modulator" com­ ABILITY, DURABILITY, achieved by use of tuned 83/-. "AEROMODELLER" bined are suitable for the achieved by up-to-date "TONE high Q chokes in all Receiver. Single channel "Aerotone". All kits are pre­ SYSTEMS". transmitters. "carrier" 64/-. "PRINTED assembled and contain all Άτ "Receivers" totally CIRCUIT" Carrier transmitter finished components. Full 12 months' guarantee enclosed. protected "UNITONE” single channel from dust and exhaust Telescopic aerials, A FULL RANGE of switches, condensers, ACCESSORIES tone. Hand held transmitter fumes. resistors, valvos. tran­ £9/3/0.2|-oz. Receiver £7/7/6. i t "Tern p e ra tu r e ” sistors. equipment R.E.P. - |oz. Relay 24/- eases, etc. 3-Reed unit ... 35/- "TRITONE" 3-channel reeds. stability ensured by ** 6-Reed unit ... 50/— Hand held transmitter £9/6/6. choice of high stability 8-Reed unit ... 60,- 5-oz. Receiver £11/6/6. components. ACTUATORS "OCTONE" 8-channel reeds. Ά: “Sextone and Oc- "UNIAC" motorised Simultaneous operation. Crys­ tone” fitted with % 44/-. “MINI UNIAC” tal controlled Transmitter and original "neon flasher” motorised 52/-. “SO­ matched 10-oz. receiver £50. battery voltage indi­ LENOID" for light­ weight multi models, "SEXTONE" 6-channel reeds. cator. V rudder control 30/— Crystal controlled trans­ "Pretuned”, no ad­ "OMNIAC” motorised for single or multi mitter with "Joystick". 8-oz. justments or tuning 60/- receiver £31 17/3. required.

★ 27 M e*. TRANSISTORS * ★ 27 M ie s . CRYSTALS ★ Complete with Circuits and Com­ Complete with Circuits and Com­ ponent Values for "Tore” Singlc- ponent Values for "Carrier" and and Multi-Receivers 44 - “Tone” Transmitters 40/- SEXTONE EXTENDED PAYMENTS REED RELAY ASSEM BLIES. Complete in Light Alloy Cate The super hand-held multi-channel outfit — best value in R/C today I ! AVAILABLE ON EQUIPMENT FROM £15 6 R.U. & 6 R.E.P. Relays £9/0/0 8 R.U. & 8 R.E.P. Relays £11/0/0 February, I960 103 m su m

t i i k m o n i l 147 DERBY STREET ROLAND SCOTT SPECIALIST BOLTON, LANCS. ★ ★ ★ e n g i n e s ★ ★ * CONTROL LINE KITS * * RADIO EQUIPMENT * * * * TO ORDER * * * Fox .099 1.6 c.c. Glow 60'- K.K. Demon "A" T.R. 29 2 * R E C E IV E R S * H o m e : List you- reauirements Fox 15 2.5 c.c. Glow 70'- K.K. Talon Combat 24 8 E.D. Boomerang and Escapement and forward P/O or Cheque. Fox 35 6 c.c. Glow 175/- K.K. Spectre 2.5 c.c. Stunt 37/4 Ready Wired ...... 126 2 I WILL DO THE REST Cox Pcc Wee .3 c.c. 50/- Frog Condor 1.5 c.c. Stunt 29 3 E.D. Airtrol 144 C.O.D. service available Vcco 19 3.2 c.c. Glow 135 - Mercury Lightning 58 9 E.D. Mk.IV 3-Rccd 238 O v e rs e a s : Orders arc forwarded Vcco 29 5 c.c. Glcw 175/- Lightning De Luxe 7 5'6 E.D. Everest 6 -Reed 354 - Free of British Tax and payment Veco 35 6 c.c. Glow 175/- Mercury Monarch Stunt . 36/- Ripmax Pathfinder 119 6 can be made by cheque. Notes, Cox Thermal Hopper 80/ - Mercury Toreador Combat 26'9 R.E.P. Unitono ...... 142 - Money Order, Dollar Draft, or Cox Olympic 2.5 c.c. Glow 135'- K.K. Firefly 20" .5-1 c.c. 15/9 R.E.P. Tritonc ...... 226 - Exchanges for Modelling Equip­ Enya 19 3.2 c.c. Glow 88 8 Frog Gladiator Combat ... 28 9 * TRANSMITTERS ★ ment from your country. Enya 35 6 c.c. Glow . . 145'- * FREE FLIGHT POWER * E.D. P C.1 ...... 118 ★ POPULAR ACCESSORIES* O.S. Pet 1.6 c.c. Glow 57/- K.K. Halo 42' .5-1.5 c.c. . .. 19 10 Ripmax Pathfinder 99 6 Celspray Airsprays ... 9/6 O S. 15 2.5 c.c. Glow 109/3 Acronca Sedan 65' 70'- E.D. Mk. IV Complete 193 7 Thimbledrome Handy Reels 38/4 O. S. 35 6 c.c. Glow 130/- New Junior 60' ...... 52'6 E.D. Everest Complete 238 D. C. Test Stands... 12/11 Enya 60 10 c.c. Glow 209 - Calypso 50' Contest 21/- R.E.P. Unitono ...... 177 6 E. D. 246 and 346 Jet Assembls. 6,'- Rivers Silver Arrow 3.5 c.c. 125 8 Veron Dea OT 52' 33 4 R.E.P. Tritone ...... 183 5 Fuel Filters ... 2/6 P. A.W. Special 1.5 c.c. 88 6 K.K. Gaucho 44' 1-1.5 c.c. 21/6 Octcne Unit Complete £50 - - Class "A" Pilots 2/5 "B” 3/1 P.A.W, Special 2.5 c.c. ... 125/8 Frog Tutor 38' 1 c.c. 24 6 * R C ACCESSORIES * Elmic Limitanks ··■ 7/9 Eta 19 3.2 c.c. Glcw 1 35 5 * REBORING SERVICE * E.D. Mk. Ill Escapement ... 23 8 Finest Jap Silk . . sq. yd. 6/- Eta 29 5 c.c. Glow 142'- 1 can now supply works rc-:ondi- E.D. Clockwork Escapement 56 8 10 c.c. and 15 c.c. T.R. Tanks 3/3 Taplin Twin 7 c.c. Diesel 172'- tioned cylinder units for the F.R. Clockwork Escapement 47 A Merrnry Pressure Tanks 5/3 Mills P .75 c.c. Diesel 63Ί0 following engines FROM STOCK: F. R. Compound Escapement 49 II K.L.G. Miniglow Plugs ... 7/7 Mills S .75 c.c. Diesel 70 7 E.D. Bee Serios 1 and 2; E.D. 246; Ripmax Mactuator 23 10 K.K. 3'Airwheels ... 25/- E.D. Bee I c.c. Diesel 52'6 Mills .75; Allbon Dart; Merlin; Mini Uniac Actuator 52- K.K. 4" Airwheels ... 29/2 E.D. Fury 1.46 c.c. Diesel... 75'3 Spitfire; Sabre; Allen Mercury 10, Standard Uniac Actuator 44 - Varipitch Prop ...... 6/11 E.D. Racer 2.46 c.c. Diesel 76/9 15, 25. 35. Total Charge 15 ■- plus F.R. Lightweight Escapement 25 3 Altmaster Altimeter ... 25/- E.D. Hunter 3.46 c.c. Diesel 77/11 the return of your cylinder unit. R.E.P. i-oz. Relay 2 4 - Spccdmastcr Speedometer 32/6 Allbon Bambi .15 c.c. Diesel 75'6 SECOND-HAND ENGINES Ripmax A30 Relay 18 6 Xacto Burlington Chest ... 103/— Allbon Dart .5 c.c. Diesel 62 8 Allbon Dart .5 c.c. 37/6 E.D. Polarised Relay 30 Wood Carving Sets 27/6 & 46/3 Super Merlin .76 c.c. Diesel 51/2 Elfin 2.49 PB ...... 40/- 0-5 M'A Meter ...... 2 0 ,- Balsa Stripper 5/9 Plane 7/9 Allbon Sabre 1.49 c.c. Diese1 51/2 Allen Mercury 3.5 c.c. 45 - 6-Recd Tuned Relay 6 0 - Engine Bolts ... pe· packet 5d. 1 77 9 E.D. Racer 2.46 c.c. 47 6 Also: Venner and Exide Accs. Ever Ready Electric Motor I0 '3 Alton Mercury I c.c. Diesel 56 8 E. D. Hornet 1.46 c.c. 35 - All Batteries, Wire, Switches. Light Laystrate C/L Wire 3/4. 4/9 Allen Mercury 1.5 c.c. Diesel 57/10 E.D. Hunter 3.46 c.c. ... 45/- Valves. Plugs, Reed Banks, Elmic Universal Timer ... 15/- Allen Mercury 2.5 c.c. Diesel 66 5 Miles 5 c.c. Diesel ... 90- Potentiometers and All Spares. Solarbo Balsa. Truflex, P.A.W., Allen Mercury 3.5 c.c. Diesel 69/6 ETA 29 Senes VI ...... 90/- * AMERICAN R/C * Frog and Stant Props. Spinners, Frog 150 R 1.5 c.c. Diesel 53/6 E.D. Comp. Special 2 c.c. 35/— EQUIPMENT Wheels, Dope, Cements, Tissue, Frog 249 Modif.ed ... 92/- Full List forwarded on request. I can now obtain most American Fuel, Transfers. B-ushcs. etc., etc. Frog 349 BB 3.5 c.c. Diesel 79, 2 Second-hand Engines, if in good Units including Orbit, Babcock, I can supply spares for all Allbon, Frog 500 5 c.c. Glow 72 9 condition, will be taken in part Citizenship, Bramco, C.G.. Deltron. Elfin, E.D.. Mills, A.M. and Frog Webra Piccolo .8 c.c. Diesel 75/ exchange for any modelling goods. Details upon request. Engines from stock. * HIRE PURCHASE TERMS are available on all purchases over £2. Send for lists and simplified agreement form * * * m m 104 February, I960

The Ultimate in 5c.c. Racing Engines The ETA 29 MK. 6C. Send for £ 5 . 1 9 . 6 plus £1.2.5 P/T this book

The B EST in the WORLD

ETA ENGINES Worry and upsets between husbands and wives so frequently arise through lack of knowledge of modern family planning. “ Planned Families are Happy Families” deals frankly with many of the questions which too often have to go unanswered, and can help to resolve one of the commonest ETA 19 MK. 2 problems in married life. Every £ 5 . 1 4 . 0 plus £1.1.5 P/T married couple should have a copy. You can get yours now—absolutely free. and now we proudly announce the “ ETA 15” Diesel Engine FREE! POST COUPON NOW This motor has been developed over months of research, and is in an entirely re-worked condition when purchased, AT NO ADDITIONAL COST. S^^^To^Planned Families Publications, 2 Every unit is given the specialised care and 12 Oval Road, London, N.W.i. 2 attention that is necessary to make the 29 and 19 ! Please send me, under PLAIN COVER, 5 the top of their class. : a free copy of “ Planned Families are ■ LOOK AT THE PRICE ! ! Happy Families.” I am an adult. £ 5.19.10 inc. P/T Send to us for full details. This motor will be ; N A M E ...... S available in April. ■ ADDRESS...... ■ E. T. A. INSTRUMENTS LTD. 289 HIGH STREET · WATFORD · HERTS 105 I960 February, I960 mm

Argentine ·

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

AUSTRALIA 272-274 HIGH STREET · SUTTON · ElAWi S0N"LTD SURREY · VlGilant8291*2

B R IT A IN ’S OLDEST, LA RG EST AND REST KNOWN MAIL ORDER SUPPLIERS ENGINES ENGINES FLYING MODELS RADIO - CONTROL g D. Boo I c.c. 44 6 + 81- ★ CONTEST including ★ D.C. Kits Complete E.D. Outfits GLO-MOTORS E.O. Fury . 63/9+11/6 Spitfire C/L 12/- + 2/- ★ JASCO KITS Boomerang £10/7/0 + 37/6 Merco 29 £5/0/0 + 19/6 P D. Hornet . 46/-+ 8/4 Calypso 50 18/—r 3/— ★ KEIL including Mk. IV Senior £18/4/0 + 65/9 Merco 35 £5/0/0 + 19/6 E D. 2.46 c.c. . 65/-+ 11/9 Inchworm I8/- + 3/- Demon ... 24/9 + 4/3 Everest ... £25 0/0 + 90/3 A.M. 0.49 33/6+ 61- e'.D. Hunter 66 - III/11 Voodoo ... 18/-+3/- Gazelle ... 16/6+3/4 Transitrol £11/0/0 + 39/9 Fox 15 2.5 c.c. ... 70/6 F D. Comp. Spec. 52/-+ 9/S Combat King 2I/-+3/6 Talon 21/3 · 3/7 Airtrol ... £12/1/6 + 43/7 Frog 0.49 RG ... 42/6+ 71- 6D.Mk.IV ... .65/- >11/9 Empress 24/11+4/- Spectre 28 9 · 4/10 E.D. Receivers Frog 0.49 PG ... 49/6 + 8/- Eu Mk. II £5/14/0* 21/5 ★ MERCURY including Halo 17 6 2/9 Airtol ... £6/2/0 + 22/- Eta Mk. VI C £5/19/6 + 22/5 Frog 0-29 c.c. .. 37/5+ 6/1 Lightning 50/- r 7/6 Caprice 13 6 2 Everest ... £15/0/0+54/2 Swan Glider , 10/1 +1/5 Firefly Stunt 126 2/3 Boomerang £5/7/6+ 18/8 DIESELS Fr0Mfod49BB· .. . 79/-H 3/6 Agressor... 24/-+4/- Marquis 28/3 + 4/3 Mk. IV Mini £16/16/8 + 72/11 Rivers Silver Frog 1.49 Vib. . 45/9 + 7/2 Junior Monitor. 19/3 + 3/3 Gaucho ... 18/3 + 2/9 E.D. Transmitters Arrow... I08/- + I7/8 Frog ISO R. .. . 46/-+ 7/2 Marauder 14/6 +2/5 Bandit ... 18 i P.C.I. £5,0/0+18/- Rivers Silver Frog 80 ...... 39/- + SI- Marquis 27/9 + 4/9 Cessna 170 18/4+3/1 Mk. IV Mini £10/0/0 + 38/- Streak 122/-+21/3 Frog 3.49 B.B. 67 10 - 11/4 Marvin ... 16/-f 2/8 Pacer C/L 15 Hand Trans £4/4/0+ 15/2 Rivers Silver Frog 100 Mk. II .. . 46/-+ 7/6 M.E. 109 24/3 + 4/3 Jnr. 60 ... 45/- +7/6 Everest ... £10/0/0 + 38/1 Streak untuned 108/- + 17/8 Mills .75...... 48/- + 9/- Monocoupe 40 28/6 + 4/9 Pacer C/L 15/--*- 2/6 E.D. Components TaplinTwin £7/7/0+25/- SpitfireMW.il ...44/1 7/2 Monarch 30/- + 5/- Piper 18/4 3/1 Esc. Mk. II or III 20/-f 3/8 Taplin Twin Picador ... 16/-+ 2/8 Southerner 60 40/- - 6/8 Clockwork Esc. Watercooled £8/10/0+28/- Skyjeep ... 28 6 M 9 ★ YEOMAN Sclf-Cent. A M. 2.5... 56/—+10/5 Jetex. Solarbo, Fuels. 31/3 +5/3 ★ VERON including Rudder Mech. 62/6 + 11/4 A.M. 3.5... 58/6 +I l/l Cepients. Dopes. Tissue Spitfire ... ■Hardware'. Props. Air- Thunderbird 24/3 + 4/3 Colt 23/6 +4/- All other E.D. items available A.M. 10.1 c.c. . 49/-+ 7/8 Tiger Moth 28/6 + 4/9 Deltaceptor ’ Imp’' 31/3 + 5/3 TRI-ANG A.M. 15 ... 50/—+7/10 wheels. etc., bv leading 22/6 + 3/8 15/6+2/7 Crystal Cont. Trans. £6/10/0 65/- + 10/- makers. Also Books. Tri-ang Toreador Cardinal... D.C. Bambi Train equipment, etc. etc. ★ FROG including Deacon ... 289 4/10 FRED RISING R/C Equipment D.C. Manxman . 65/-+10/- Condor...... 25/—M/2 Fairy D ... 41'3 * 6/10 stocked. DC. Sabre 16.'-+ 71- Focke Wulfe 22/-+ 3/8 All R.E.P. equipment stocked D.C. S. Merlin . 46/- I- 7/- PLASTICS Frog 45 ...... 25/-+4«2 by Airfix. Aurora, Eagle, Gladiator Combat 24/6 ( 4/3 Lavochkin 26/-+ 4/4 D.C. Merlin 38/-+ 6/7 Tempest ... 41/—+7/2 Minibuster 15/9 * 2/8 AEROMODELLER ANNUAL D.C. Dart Mk. II 56/-+ 8/7 Frog. Kitmaster. Lind- 1959-60 Post Free 11/6 D.C. Rapier 67/- . 10/9 berg. Revel, etc. Tutor ...... 20/6 + 3/5 Panther ... 26/—r 4/4 ARTHUR MULLET 9-POINT PURCHASING GUIDE ic I. No P/Tax on overseas ordors. 6. Parcels sent by air at cost to order· ★ 2. Orders over 40/- from abroad 7. Orders despatched by return. acknowledged by airmail. 8. SPECIAL ATTENTION TO ★ 3. Full official rates allowed on REQUIREMENTS OF H.M. foreign currency SERVICES. WRITE FOR DETAILS. ★ 4. Goods sent C.O.D. where opera­ 9. Home Buyors-Orders over 30/— tive. post free. Under, please add 1/6 for ★ 5. Goods insured in transit. P./P· Kindly mention AEROMODELLER when replying to advertisers ιιχτ: j^j m m m 106 February, I960

AIR PICTORIAL /6d Contrary to conflicting model press reports

the monthly magazine LEIGH MODEL CENTRE AIR PICTORIAL for the air enthusiast. stillremains main suppliersand importers of all Scores o f vivid GRAUPNER EQUIPMENT photographs, drawings o f the new — including model kits, accessories and radio equipment. Please be assured that we are the only firm carrying and older — a ircra ft. the whole range of Graupner equipment and representing See the world air this leading German manufacturer in this country. view in pictures and features. LEIGH MODEL CENTRE 97 Railway Road, Leigh, Lancs. Phone: Leigh 72673 I f you w o u ld lik e a F R E E C O P Y Galloping Ghost

NEW AIRCRAFT TO MODEL f ill in and pulse proportional data ALL THE LATEST GEN! All published information on single channel proportional radio control To Rolls House Publishing Co. Ltd., 2 Breams Buildings, London, E.C.A summarised in a special booklet to cover the fascinating subject. Includes topline U.S.A. and British expert advice with installation Please send me a BLOCK LETTERS PLEASE circuits for pulsed rudder, Galloping Ghost Rudder/Elcvator with or without engine control and simple dual proportional. A reference specimen copy of NAME book “must” for R/C fans. Eleven contributors include world's top. AJR PICTORIAL Pulse Proportional experts:— ADDRESS Pulso Box for rudder only by Dave McQue. Transistor pulsing by for which I enclose Tommy Ives, Chas. Riall and Nat Rambo’s practical data. Harry Cuck- son’s Tx, all are in this booklet. RC735 for only 3 /0 (Rh* 6d. post) 6d. for postage and packing. AEROMODELLER PLANS SERVICE A/MoD. 38 CLARENDON ROAD, WATFORD, HERTS } * PLANELY THE BEST!

Joy-plane Regd. PRODUCTS JOY-PLANE BALSA CEMENT is very quick and hard setting, penetrates deeply ΤφΜ PLASTIC ENAMEL and is oil, fuel and heat resisting. In Regd. long nozzle tubes: 6d., I0jd. and PLASTIC ENAMEL PACK Is. 6d. Long nozzle tube is ideal for Contains six bottles of applying in awkward places. Plastic Enamel : White, JOY-PLANE QUALITY PRODUCTS IN­ Blue, Yellow, Red, Black; CLUDE: CELLULOSE-DOPES. Glossy, all and Brush Cleaner. Com­ colours. Also Matt, Black, White, Grey, plete with brushs Ϊ / Duck Egg Blue, Green, Brown. Tins and two palette * / I0id., 1.8, 3/-; J-pt. 5/-. CLEAR DOPE. (Does not bloom.) Tins All colours inter-mix 9d.. I 3, 2/-; j-pt. 4 -. Extra Strong Ideal for use on: POLY­ Quality J-pt. 5/- STYRENE. WOOD. GLASS, RUBBER LUBRICANT, bottle, 9d. METAL, CHINA, PLASTER, PAPER, CARDBOARD, etc. PLASTIC WOOD, tubes, I/-. Dries with a mirror-like GOLD FINISH (Cellulose and Non-Cellu­ finish lose quality), tins I/·,2:·, 3 6; i-pt.8/- SILVER FINISH (Cellulose and Non-Ccllu- lose quality) tins lOJd., I 6, 2/9; J-pt. 4 6. Cellulose Finish can be fuel-proofed i Very Quick' Specialists in own label packing. BANANA OIL No. I Thick; No. 2 Thin. And ~ Tins 9d., 1/3, 2 ·; J-pt. 4/-. Why not send your packing problems to us ? HIGH GLOSS WATERPROOF FINISH, Hard Setting bottles 9d. QUALITY PRODUCTS TURNBRIDGE LTD., LONGLEY ROAD. LONDON, S.W.I7 Kindly mention AEROMODELLER when replying to advertisers I

February, I960 107

11 KITMASTER MODELS OUT NOW! NO. 1 Stephenson’s Rocket 4 6d. m w m No. 2 Diesel Electric Shunter A 6d. NO. 3 Early American General 6,6d. No. 4 Coronation Class 10 6d. Kitmaster’s latest No. 5 Schools Class Harrow 7/6d. Battle of Britain Class

If you collect world-famous locomotives, here’s one you must not miss: Battle of B ritain Class ‘Big-gin HilP. I t ’s No. 11 in Kitmaster’s authentic series of plastic scale model loco kits, actually made from British Railways blueprints. Build it to­ day—to run on OO and HO gauge tracks. Price 10/6d.

NO. 6 Saddle Tank AIM. No. 7 Prairie Tank 6 6d. NO. 8 Italian Tank 4 6d. NO. 9 Stirling 8 ft. Single 7 6d. NO. 10 Deltic Diesel 10 6d. KCII NO. 11 Battle of Britain Class 10 6d.

ROSEBUD KITMASTER LIMITED AT MODEL AND TOY SHOPS EVERYWHERE firm RIVERS 3*5c.c. THE MODEL SHOP SILVER ARROW MANCHESTER Displacement 3.49 c.c. Bore and stroke PROMPT MAIL ORDER SERVICE .647 in. Over .4 B.H.P. at peak r.p.m.! PLEASE INCLUDE POSTAGE THE MOST POWERFUL 3.5 c.c. D IE S E L IN T H E W O R L D ENGINES only £ 6 .5 .8 (inc/· ρ/Ό DIESEL FOX 1 9 ...... 135/2 A.M. 10 ...... 56 8 FOX 35 R.C...... 200 - Easy starting, smooth running, the A.M. 15 ... 57/10 FUJI .099 ...... 44 9 engine that gives extra power or A.M. 25 ...... 66 5 FUJI 19 ...... SSI- Combat. R.'C, Stunt, Free flight, etc. A.M. 35 ...... 69 6 ENYA 09 ...... 60 6 Special accessories include throttle A.S. 55 ...... 556 ENYA 15 ...... 81/7 unit and tank pressurisation nozzle. D.C. DART Q/S 64 7 ENYA 29 ...... 100 10 D.C. MERLIN Q S 44 7 ETA 29 ...... 141/11 D.C. SPITFIRE Q/S . 53/- MERCO 29 ...... 119 6 E.D. PEP .8 38 4 O S. P£T ...... 57/6 E D. RACER 76 9 O.S. 35 R.C. · ... 158/4 SILVER STREAK 2*5 c.c. E.D. RACER W'C 94 5 Displacement 2.49 c.c. Bore and stroke .5782 in. E.D. HUNTER W/C 103 10 R,C GEAR Max. B.H.P. .28 to .30 at 15.000 - 16.000 r.p.m. FROG 100 Mk. II ... 53 4 R.E.P. | oz. RELAY 24/- FROG 150 R. 53 4 R.E.P. P.C. Tx 20/6 The engine that has set new standards for pre­ FROG 2.49 76 10 AEROMODELLER Tx KIT 64 - cision workmanship and dependable per­ FROG 2.49 MOD 91 10 MINIUNIAC ...... 52/- formance — and fast becoming the popular MILLS .75...... 63 10 ALL R.E.P. SETS IN STOCK ! choice for contest work. P.A.W. 1.49 . 86 - P.A.W. 2 49 126 Only a few months in production, but RIVERS 2.5 125 8 MERCURY M.E. 109 ... 28 6 already in the winning circle! (Both RIVERS 2.5 MOD. 155 - K K GAUCHO...... 21/6 Standard and Tuned versions.) RIVERS ARROW 3.5 ... 125 8 K/< FJREFLY ...... 15/9 K/K CAPRICE ...... 15/9 TUNED TAPLIN TWIN W C 196 - Individually reworked I C O FABULOUS! DRABANT 2.5 127/2 K/K MARQUIS...... 32/6 VERSION and fully works tuned I f · IO.U K/K GAZELLE 19/10 GLOW FROG TEMPEST 48 2 A.M. .049 396 FROG TUTOR 23 II COX SPORTSMAN 9S FROG *A RACER 24 6 THE BEST IS ALWAYS RIVERS! COX OLYMPIC 1536 VERON COLT 27 6 Rivers diesels are built to the highest engineeringstandards FOX ROCKET .09 45 6 CONTEST INCHWORM 21/6 —patented roller-race main bearing—high-speed porting— FOX ROCKET 35 ... 110 2 PLASTIC KITS by Rcvcll Lind- manufactured from aircraft specification materials through­ borg, Monogram, Aurora Frog, out—individually inspected and ccsted—precision built man, Veron, Contest and Frog Klecware and Airfix in stock for SMOOTH power. Kits in stock. Send S.A.E. for K.S.B. TIMERS NOW 27/6 Lists Thimbledrome Handyreels 38/4 A E.RIVERS 15 M aswcll Park Road ?■ 13 BOOTLE ST., MANCHESTER 2. BLA 3972 (SALES) LIMITED HOUNSLOW MIDDLESEX Kindly mention AE R O MO D ELLER when reply ini· to advertisers βΙ am m 108 February, I960

Cambridge University Gliding Club AN N O U N C IN G — A sensational new GLIDING HOLIDAYS ALL TRANSISTOR receiver by EssVee at Cambridge All welcome for six courses during July and August. Training to solo and soaring in a week in best aircraft. Instructors fully qua ified. Fixed The 64 ΜII ” fee 15 gns. fully inclusive, flying and board. If you have ever been All Transistor—from Aerial to Actuator interested in gliding this is your opportunity. Designed by electronic engineers to the following specification, which Details:— Secretary, 3 Pembroke Street, Cambridge is unmatched by any other receiver. •ft Ho valves or relays—will last a lifetime. •ft Current rise on signal of 500 ma. will operate any λ .υ . m i t o m v L s ii t v ic i: actuator direct. Auto Vaporisers, New Road, Lymm, Cheshire •ft Fully Temperature Stabilised. R e b o re s : E.D. Bees and Elfins 14/-, o t h e rs 16/-. Under ·46 c.c. 20/-· •ft Uraffected by vibration. C.W.O. or C.O.D. 2/- extra. S p a re s stocked, plus Fuel Filters and •jlf Economical — works off miniature 9-v. battery at Carbs. Enquiries S.A.E. please. Prompt service and sixty-day less than 3ma. drain. guarantee. Send for price list for other services. (Trade enquiries invited) •ft Operates with any carrier transmitter. Ά Built-in Auto Gain Stabilisa­ tion — ensures maximum performance with only one EIFFLAENDER REBORING SERVICE simple tuning adjustment. FIELD BANK, CHESTER ROAD, MACCLESFIELD •ft “ Out-of-sight” range — GIG inspires confidence. -ft Complete receiver weighs REBORES: BEES Series I and PB ELFINS, 14/-, HALF •ft Size: 2 in. y I J in. x 11 in. only 1} oz. c.c.s, 20/-, OTHERS 18/-, except those under .46 c.c., which are 22/·. Prices cash with order. Return postage free The EssVee “ Microdync-One” enables an all-up weight of under C.O.D. service 2/- extra. SPARES stocked and fitted. 5-oz., including batteries and actuator, to be easily obtained. ENQUIRIES S.A.E. please for immediate attention. Price: plus £ 1 . 1 8 .0 P . T . PROM PT SERVICE with 30 days* guarantee. W e do not bore (No. P.T. on overseas orders) ______rin g e d m o to rs .______The EssVee "Microdyne-One” is fully guaranteed for 12 months. Term s: Cash with order—money refunded if returned within seven days. THE BETTA MODEL AEROPLANE SUPPLY CO.. Trade enquiries invited NEW PLYMOUTH, NEW ZEALAND Obtainable direct from: wish to thank all their friends in all parts of the world for the kind thoughts and good wishes received since the death of Ess VeeELECTIlOilllCS their principal, Mr. Gordon Smith. Contrary to rumour, MARKET CROSS, MALMESBURY, WILTS. the business is N O T being closed down, but is being carried on under the same name, and we look forward to many more S.A.E. with enquiries plcose. years of pleasure in serving the modelling public of many N a tio n s .

Every model, technical reference GRAUPNER ULTRATON or historical book on aviation, plus plans, photographs. All Transistor Single Channel Tone. I1- stamp for catalogue. Beaumont Aviation Literature Small: Photographist actual size 2a Ridge Avenue Ij xljx It Winch more Hill. London. N21 Lightweight: 2 ozs. complete with relay. Bookshop open Saturday only Crashproof: All parts except relay embedded in resin. A e r ia l: Coupled to receiver, position not critical. MODEL AIRCRAFT ENGINEERING SERVICE P o w e r Supply: 6v battery only. REPAIRS, etc ...... On foreign motors a speciality. (ENYA, O.S., Weight I oz. FUJI. FOX. VECO. K. & B., etc.) Current Change: Idle 1.5mA. R E B O R E S ...... All Diesel, 1 4 /-;all Glow over I c.c.. from 14/-; with signal 22rrA. K/C two-speed conversions from 18 6. Send for T u n in g : Rotate one control until full lists of repairs. relay operates. ACCESSORIES, etc. S.A.E. please. Special work done to your R e la y : Latest, lightest, Gruner 957 requirements. Send for details of the recon­ (available separately for home ditioned engine servic e, part excha tge or cash. constructor.) Guarantee: Six months. DAVE M ORGAN, 4a, 6& 8 Loch St.. O rrell, N r. W itan, Lancs. Connections: Simple, you can't go wrong!! Frequency: 27.12 mes—modula­ tion 400 cps. £11/19 incl. Tax.

SUITABLE NEW TRANSMITTERS.—Non-crystal. £8/17/6; Crystal, £10/10/0; or modulation kit (£1/18/8) for your “Carrier” type Tx. ΑΊ Graupner products and All makes of Radio Control equipment advertised in British magazines available. Orbit R/C Equipment. (4, 6 , 8, 10 Channel) to order - Bonner Duramite Servos — Siemens ioz. relays 5,800 ohm .— Typhoon R/C Vacuum euipment. — Graupner 10 Charnel Simultaneous and Proportional as available HIRE PURCHASE FACILITIES AVAILABLE ED JOHNSON (Radio Control) Larkhill, Amesbury, Wilt* Phone No.: Durrington Walls 366, 9. am.- 9 p.m. Ring before you come

Kindly mention A ER O M O D E LLER when replying to advertisers February, I960 109 n m m a

E.D. Racer and Bee. both reworked, £2 each. Bench run only. Apply: ___CLASSIFIED ADVEIKTISEtlEATS ____ Bowry, 28 Celandine Road. Hcrsham, Surrey. PRESS DATE for issue March, I960, January 18. I960 Brand new unused E.D. Boomerang Rx £5. Box 609. ADVERTISEMENT RATES Mills *75 20s.; Bee 22s. 6d.; Mach 1 55s.; Ohlsson 23 S.P. with coil 45s.; Rollcicord camera, light-meter, tripod etc. cheap. S.A.H. Goddcn. 32 North Private Minimum 18 words 6s. and 4d. per word for Bank Road. Batlcy, Yorks. each subsequent word. Frog 3·49 BB 65s.: Babe Bee 35s.; 6 E.D. Standard relays 12s. 6d. each; Trade Minimum 18 words 12s., and 8d. per word for R. E.P. 3 reed unit 25s.; E.D. 3 reed unit 20s.; All as new. Ohlsson 60 80s.; each subsequent word. KK Krackcr coil 20s,; Frog 500 40s.; E.D. Transitrol receiver £5 or offers. Box numbers are perm issible, to count as 6 words when costing Donaldson. 13 Bury Avenue. Newport Pagncll. Bucks. the advertisement. Most Μ.Λ.Ρ. books, excellent condition. Offers? Aeromodcllcrs. plans, S. A.H. for list to D. Williams 46 The Avenue, St. Paul’s Cray, Orpington. CO PY and Box No. replies should be sent to the Classified Kent. Advertisement Department, The "Aeromodeller", Oliver Tiger Mk. Ill, K.B. Torpedo 19, 14 10s. each; E.D. Racer 45s.; 38 Clarendon Road, W atford, Herts. Ellin 2'49. A M. 35 40s. each; Frog I 49. Hlfin 1-49 30s. each: Mills -75 25s. Albon Dart 11. Howie, 55 Oaimhill Circus, Glasgow, S.W.2. F O R S A L E Cox Peewee, plastic aircraft and all accessories all unused 15. Samuel Well stocked Model. Handicrafts. Art Materials. In Country town. Suit Tanner, 2 Astley Avenue, Cricklewood. London. Model enthusiast, or make good branch for Firm. Good living accommoda­ R (' Bargains HD IV 3-channcl Tx 14 Rx 15 Dean reed 85s. all new, tion. Well modernised. Freehold. £2,800. S.A.V.- Elder, Auctioneer, unused. Other receivers from 12 S.A.H. for list. Box 610. Hcanor, Derbyshire. McCoy 29 (spark) 15; AM 10 12: Frog 80 30s. all bench run only. Other TRADE engines from II. Write for list. Box 611. Model Boxes Made to Order 6 ft. x I ft. x I ft. 35s.; painted. Send S.A.H. Hnyas Ί9, 15 £3 each; Banibi 30s.; Mills ·75 Marine £2; A.M.35 II; for full price list. Shipman & Johnson. 2 Deighton Lane, Healey, Batley, A. M.I5 £2; Built “Spectre” 25s.; McCarthy, 13 Durham Road, London, Yorks. F..I2. Ilf 5953. Tatonc Clockwork Timers. Fuel shut offs (0—20 secs.) and D-Ts. (0—6 A.M.25 £2: Tri-ang transistor Receiver 12 10s.; I ransmitter £4.; Conquest mins.). Weight only J *»/. 30s. each post free from Dave Posner, 61b Canfield escapement, £1; Fox 19 £4; Frog Modified £3. Racer, broken shaft, ofTers to Gardens, London. N.W.6. B. Wilson. The Old Parsonage. Swanland, Yorks. Radio controlled Junior 60 complete with F..D Racer. Tri-ang equipment, Microfilm and indoor model supplies and kits. I 100-in. sheet balsa, and batteries 112. Morris. 15 Greshficld Road. Heaton Mersey. Stockport. tungsten, nichromc and Karma wire. Teflon and metal washers. Complete Oliver liger III works modified, little used. £5 10s.; Λ.Μ.35 30s.; Fuller. catalogue available. Include postage. Micro-Dyne Precision Products, 129 Firs Drive, Cranford. Middlesex. 238 West H St., Ontario, California. U.S.A. Tuned A.M.35 50s.; Hlfin I 49 30s.; Mills L3 new 50s.; Mills 75 30s.; G.20V Super Tigre. just arrived from Italy, £6 10s. Od. Leigh Model Centre, Hobbies Champion kit 10s. S.A.E. Dins, 21 Orchard Close, Fctcham, Surrey. 97 Railway Road. Leigh, Lancs. H.D. Green, reed induction. Racer as new 55s.; Hornet, new, unused 40s.; Ex-Government Stop Watches, 45s. Illustrated leaflet on request. Charles Barley. 112 Moor Lane, Rick mans worth. Herts. Frank, 67-73 Saltmarkct, Glasgow, C.l. Allbon Bambi 12 15s.; 2 H.D. Babies 30s.; each. 2 L.D. Bees 15s. pair; Catalogue No. 14 Government Surplus and model radio control. Over Merlin £1.; H.D. Hornet 12; Hlfin I X II; I D. Racer 12; A.M. 10 12. Details 500 illustrated items, 2s. (refunded on purchase), P P 6d. Arthur Sallis S.A.H. Λ. I Baker, Kings Arms Hotel, Cookham. Berks. Radio Control Ltd., 93 (A) North Road, Brighton. Best offer secures my unwanted At romodri i i r’s 80 issues 1949-58 and two annuals. Wanted small fourstrokc engine. A. Womack. Manor House, Ex-Services stop watches (wrist and pocket). Split action Stop watches, Bawtry, Yorkshire. time-of trip clocks, wrist chronometers and watches, etc. All with 12 G.20V (unrun) speed pan, speed spinner, spares—exchange for unrun months’ guarantee. From 52s. 6d. Binoculars, telescopes. Send S.A.E. Oliver Mk. Ill; G.30 diesel (and spares) guaranteed just run-in 14. S. Savini, for list. United Technical Supplies Ltd., Dept. A. 3 Harrow Road. London. W.2. 243 Edge Lane. Liverpool, 7. Continued on page 111

V g r a u p n e r e q u i p m e n t ★ ★ ★ ★ ★ ★ r ' n e w ! RECEIVERS. SINGLE CHANNEL E N G IN E S : MIKROTON tone, 3 07. 1 30 v. and Fox 29 x £ 9 0 ( 6 Graupnrr Equipment available at last SPECIAL | 1 6 V. £11 100 Cox Olympic £7 12 9 TAIFUN HURRIKAN 1.5 c.c Diesel at a price you can afford. Send I 6 P.O . O . < ULTRATON tone 2 σ» Veco 29 £7 IS 0 .21 B.H.P. Absolutely terrific standard for Illustrated List transistor, crashproof £11 190 K & B 19 £7 10 0 As Reviewed m Decem ber. 1959. version £3 17 0. R.C version with exhaust MIKROKOMBI tone 4 ox. 16 v. all Fox 29 £7 IS 0 AEROMODELLER pipes and Butterfly intake £6 2 6. As used transistor, crashproof, complete with Fox 5 9 ...... £ IS 10 0 by Hans Schuni.iclWr.Kmg of the Belgians i ___Servo ..______ω______£13 15 0 E n ya 09 £3 0 6 Cup ., 1959 GRAUPNER KITS and Accessories TRANSMITTERS. CARRIER AND Enya 29 £5 0 10 Please note that most of the items are in F F R C TONE, all CRYSTAL CONTROL- F u ji 099 £2 4 9 stock now and we only need your cash to Kadett 48-m. spun Sport F F RC Kit LED AND STABLE Fuji 19 ...... £2 13,0 send some to you By-Return. Where an 1-15 c.c. includes Wheels, Dope Bellaphon "A " 5 watt output. 1 6 v. Fuji 29 £3 14 0 item is out of stock your name will be Cement, etc. 36,- acc. . £24 0 0 Rivers Silver Streak £6 5 8 added to the list and immediately wc get Tourist 48-in. span Low Wing F/F R/C Bellaphon "B” .4 watt output. 1 6 v. Rivers Silver Arrow 3.5 £6 5 8 it. it will be despatched to You. Kit, high performance. l-I.Sc.c , Wheels. batt. and 2 67.5 v £20 O . S . P e t £2 17 6 We also do a repair service on all the Dope. etc. . £2 2,8 SERVOS. Etc. P. A .W . 249 £6 10 0 Bellaphon senes including Mikroton. Kapitan 43-in. span Biplane F/F R C. I c.c. Telematic 3 v. working •eft or right at P.A.W . 149 £4 6 0 Ultraton. Bellaphon. Tx, etc. power. Wheels, Dope. Cement, etc. w ill . £3 Fox 35 R/C Special £10 18 0 Gruner 957 Relays in stock Plastic Case 12 2,8 Servo-Relay 3-6 v. working 'eft and right. O .S. 35 R/C .. £7 18 4 for Mikroton 2,6. SPARE Relays for C essna 180 Scale F F R C . 46-m span. an engine control escapement £2 10 0 A full Engine Repair Service on all Motors. Mikroton 37,-6. Spare Cate for Ultraton I c.c. power. Wheels, Dope. Cement Kinematic 4 controls on s c. for large R C Conversions 15 - to 30- 5/-. £2 10 0 aircraft or boats, 3 v £3 17 6 * * * * * * SPECIAL S a t e llit 48-ln. span R C for 1.5 power. Micromax Electee Motor for Electric Dural Undercart. Wheels. Dope. F L Y IN G .41 IS I ratios £2 18 9 (see Cement. Very Good Performance. Fast for the Control Line Flyer OecemDer Aeromodeller). O r Servo 60-1 £4 16 6 P.6 M ew G u ll. 27-in. span Scale for 2.S ratio * £2/18,9 T ra b a n t 86 span R/C G LID ER . Excellent c.c. motors. Wheels, Cement. Dope. 8c first in your Area to Co Hecfrrc. Performance. ONLY kit of Its Type. _ etc. Whcelspats £2 2 6 MAGNA CELLS CAN BE SUPPLIED Limited Quantity £4Ί9 6 Dornicr DO 27. Scale 32-m. span super Mustang PROFILE KIT. 30-in. span for T O SUIT at 3, ~ each post extra. A tla s F F Power 52-m. span. 1-1.5 c.c. scale kit with Plastic Cowl spats. Wing- 2.5 c.c. Can be built in an evening Very Good K its and w orth £1 14/0 of SPECIAL DEAC 6 v. Cells for Ultraton strips. Cockpit detail, etc Dope. Dope. Wheels, etc included £2 5/0 MIKROTON Servos, etc . £2 Anyone's Money. Cem ent. W heels, e tc., for 1.5 c.c. U lt r a S tu n te r. 36-in span Stunt fo r. Donald Duck 4-ft. Glider Kit A. I per­ Can be re-charged.. motors £3/10 0 1.5 c.c. Dope. Cement. Wheels, etc.. Don'c forget we supply all the Leading formances £1/10 0 F o ck e w u lf 190. Super Scale 39-m. span included £115/0 Makes of B ritish . Am erican. German and for 2.5 c c. motor. Moulded Plastic Cowl. Cougar. 46-m. span Stunt for 5-6 c.c. Foreign Kits. Engines and Accessories. STOP PRESS.—Booking Orders on the undercart, Wmgstrip and Cockpit detail, motors. German Nationals Winner Don't forget L.M.C. PAVES THE WAY New All Transistor simultaneous and fully with Dope. Cement. Wheels, etc. 1958. Super kit. Wheels. Dope. etc. TO EASIER MODELLING. Hurry, write proportional on all channels. Graupner's £3/19/4 £30/0 today for the FASTEST MAIL ORDER latest and best, the fabulous Bellaphon “ 10", M E. I09H 26-m. Span Scale. Wheels. Champion. Stunt 56-in. span for 2.5-3.S. SERVICE IN THE BUSINESS. 10 channels from 600-3,500 C.P.S. £54 Cement, etc., for 2.5 c.c. motors. Includes Wheels. Dope. Cement, etc Polyton "1 0 ". 24 Transistors, all sealed and including wing tanks (dummy) £2/2/6 ______£2,2/6 Post Cash, Cheque. M.O. Temp, compensated £74 Phone: ttIC M 72*73 SPECIA L PRICE FOR BO TH £125 All O.M.U. R/C Gear available. American Bcllamatic Servo, mechanical return and Foreign motors bought and sold. LEIGH MODEL CENTRE to neutral, with the Micromax Motor, ALL the latest kits and British R/C GEAR. 1-3 v. £4 IS,0 97 RAILWAY ROAD, LEIGH, LANCS.

Kindly mention AERO M O D ELLER when replying to advertisers 91 Xjcnjqaj 'X 0961 = J||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||I i •juatudinba .jaudnrjQ,, 3'y SDN ‘HOI VI J u i / J M S • qr ap n ος poi|ddns‘qsra atp sn Μομς Juiqi/uy , *,™ a « o J j U P u Z ‘ «w,™ o i j y j o j i s q o 4 i u •pn •pn y i h o h y j x •aja u 3Ay ‘0|qc|itAc 93iApyou ta^Ajas Ιυιυηχ TS IT u ina. ni«ot uig a‘3 auiiug *nti|«podt iunsaj.put C 0 8 H O I T O M V A w o v a ‘ N I SH Ν Η Λ ί N I D H O I I S 3 Μ 'aVOM ΓΜ o Sziu udd ψχαι uddxd dSpzpiouq fo o o j i o u ons d to sxojppoy^ two dq fo pounssv jvuosxod doiaJLds pojdnoo nduxid SuijppoiuojZO snidiudxvibdj 9 nt Βυφοοη’not Suiaw jjof jjof Suiaw X jvwv i o$ ψι ut ι ιψ ψ dov$s si ojqvjwdv d vf i/ f 2%υηωαρΌ fo sii/j ivdf ‘dm -ΟΛ SlOWVd .SV 3 ‘ανΟΗ ‘ανΟΗ I O H M i o a a l SV » »qt V»q s n d d n a s n a ■ 4 > o sovj b'uijppoiu suopvuj oi ψ>ι ± q 9 D J J 9 y o / D i ( 3 p LM Y H

"J*»Jaqi op sanaaiw ‘auodXNSue ‘auodXNSue sanaaiw « 9 r u p a u X i u o 3113 *S)l)f ai iia iH ia O H . s 'X i / v n 3 AansaHYa Y H a s n a tA S J o oi-uq dliciux opif-vuoq Ό XVDX s d j i s 9 M 33 P 3 D D Y 9 U 3 S OH m d HOIH AS 1 o J o n U O 311 S N X H Μ ί μ ι

T OVOU AVMTIVU

3 1 © u / A /y a/qnojj //y 3 3 / SSOJDAt ty A D J O S IS y D l j M p A S • i / i a paqsi/qojsa 9 XVW 1 2 XSVTD Cl 9 3 M SJO/fO^ M i o a a l

3

S -591 N || i(i fo fo i(i HVM OJ aaiAja$ · 00 p M IM O a 31 im iuoijjjauo 3 3 3 j ) N 9 X % Q O O J W ixpu w divxopoui ossaaao

M X 7300 AI j k s i i f i s m w D D «gftfelgM o j ιΙ Α ΐιΙΙΕ Φ Γ ^ β * 3 i n r ^ i u 003

JOI V puc

s>pojs a Homans W j o j 3

η ο υ ρ ο υ ± q 9 o / p o s i 3 6 M » COC « j n o / s o u p T 3

UI N 3 uo sjuoXy ^ -sdoqs HI X H ^,y ^,y

3 ‘

3 J J I X joq Η L jo 6

i 1

1 1

6 «WWBiffi 1 ilfffii B W W « 66W jsoisnqjua puo auiJua s o n s *SWD 'SiVOe 'DNIAU 'SIIX 'SIIX 'DNIAU ujnjej Xq tjapjQ aja|t*w 'S y n u Aj S9Ul f J U )fO 9 S 9 u lS U 9 ■S j A O j A D 3 3 9 $ S jO 'A y / j • i u l o j 'SO J0J *iuaJy

5 s NOXON

A

J OTO 's VS NISX VHS 'msx NOOTMOX

m o d O H s a a a o iA i i iA o a a a s H O d

j / / a p o t u o a a o S v9 t> tm < iv 9 u x J K j/fjDjiy j/fjDjiy H Y Q Y H Ο Ό τ χ α nuaJy 9 -a / Vd AdOXVAd OVOd [ o p i j D u p J J 9 3 I S I 0 U J u 2 l U 9 9 J t 3

LDOV ONV SLMDIONVH j o i ilDW HP°W AJ9S 9 J IA 3 9 " X aaoiAi A i o a la s H O d J 9 q o J 9 S o u p j o q n p p s

S H Y N Q D H Y d X S 3 j o jo wvHana wvHana ‘X ID 33 X « d o 3 O Y i a a o m Y — J xno a o n ix H i s s 9 (tUJaUIQ J iY a S X O N doqs ano aas 33 ai iaaiw n*n n*n UXS ONV ' JDj ua SVOO 1C ‘SXVOONOe nuva 3 o o j s s o j a i o o

UAS NOI««

‘ i x C j u J U D j p u i o p i i / j j oama oama /oajuoa s aqj o J /OJiOd X« 1 M iM o a a a J O J 33 JWDXIV JO

m — sjooq — j q o t i u u o j $ 0 / 9 j/aojs ajj/du/oa Oil

|; X XI S UXS XXId A o n j -3 lSl OV OllOS ONV DllSVld v i u 3 V SPU»S ^

9 }U9UJ4inb9 b n i 4 J U 9 U '} S 0 W 9 p o A

o u p j p p i o axnood NOxsanv |»po^ ‘ticog shx MOJ. *Jf« Pu*> j A 9 j A i q i u S j O J sai/ddns Xqqoq 13 o u p

S A

jo o j 3 3 *!jl!Jti 6 ‘sj/odaa 1/03 31 73 7300 3 J S W 8S y i j 3 j o J 30

j A 9 j A i q i u i c 0

S 4 M M O j y s IS' D

3/0 1 V ΊΊΓΗNVX ) l O x h s sauilua jsouj

W

y 3 ς ο / o j q o ‘

'VSTV

uo M M

/apojy

4 aq^ q p j a ^ // o u p

Aq 9

O

a 1 o u p 1 X ,>i ueosvi S9ut2u9 lufpoof f o o p f u l 9 u 2 t u 9 'S j o p i o S \ o p 9 i y t J O J D j j (|«jpaq>*D »H> g o n j u a u i o n j q / u/ao ijy o /os jsaJao/ )/aojs aqjfu///apouiojay jo A jnox }U9)I ) 9 U } x o n j t A s i l ‘» n o ' ηοφίΜ 3 3 3 IUOSS jia/^ jia/^ aaoiAi A i o a la s n d d n a s XDOIS Η Ο Ί Υ Ν Ο S D O X X ΙΑ

; 3 9 ’ : 7»5 Y ΊΥΗΧΝ Χ Η Υ Ί IY H O H Y •upig iao pucjQ riuauo ‘•Xuipiing o j 'avow 'avow ν». J ..a*>|oty '..■'a//aPou/0-'eV,. /apo^.. j a 3 Si /OJSOd Q i t i u q n i o j 3 H H A S 9 X 3 DNVM Α ‘dOHSΊ S 9 I'D 'SNdOOeiSH 'SNdOOeiSH I'D * ( DiA g o n j u a i u o n j q D « S DDV « 'XT VAA S I H N 33 3 3 3 si aoy ^ q a /apo^y s d a p o i/ js

‘X 3 fojsod y ·Jupojpy joa /apo Ο Ό ‘ d X A a a iA ja ^ ^ ja iA a a h o AuneaaxNVD AuneaaxNVD NdnexDvig NdnexDvig HX HXIM dOHS //oy a UXS ASU 33 S y o b m j o j u o u j s 7300 xdow n SXIX IdVdDdIV 9M I9 3 0 J U 9 P y A - J » m J U u; 9 » MXS NflS 0 1 $ q t p o M o / nwmsiM s m w tn A m aavM 3 H Y V A O n 3 r j u

i o u

ETii ES l SE SE iliE T «E uioyy s.oi/oijsny j u 3 3 i q o i J y i o u s SHX V W o j 3 d 3 ΥΜ 8C ΠΥΗΜ αθΝ αθΝ It 03 S X a / 9 ) J DN Idd S NIDN 3 w m v 6U v m w aa

j h u n s o q / i J o j t o u q A doqs 3 0 03 3 1 'peoy a/oey ZH a V 110 a i s j j j b m q u i o u j t u ) 3 X H 3 3 w a a a s 01 09 *MJ J*Pun) o q A t o n s HX AV o j w

i 3 u o j J H /

3 1 sjualy j o u j j o M q X 1 0 3 aow aow SI

aqj

i i February, I960 III a a a i m a a

Continued from page 109 DESIGN for BOOKS MODEL AVIA—the monthly magazine for model flying in Belgium. AEROMODELLERS Send for free specimen copy and subscription details. Model Avia, 67 Avenue Written in language that the average modeller Victor Emmanuel III. Ucclc, Belgium. can understand, this comprehensive book SAILPLANE AND GLIDING Published every month. Send stamped contains no tedious formulae, no intricate graphs, addressed envelope for descriptive leaflet; or 2s. lOd. for current copy; or but good honest practical facts which really give 17s. for a year’s subscription to British Gliding Association, Dept. A, 19 Park the low-down on model design. The experience Lane, London. W.l. of all the experts is assembled for the reader by American magazines. Year’s subscription. Mode/ Airplane News, 39s. an expert—Ron Warring, well-known for his Full catalogue free. Willen Ltd. (Dept. I), 9 Drapers Gardens, London, F..C.2. regular articles in AEROMODELLER. Bound in EDUCATION stiff card with a two-colour photo cover DESIGN FOR AEROMODELLERS contains 96 pages, LEARN RADIO AND ELECTRONICS the new Practical Way! Hosts size 8| x 5j in., profusely illustrated of absorbing experiments carried out at home under expert guidance to teach with line drawings, eight pages of art you Radio in a new, enjoyable and interesting way. Construction, servicing plates showing tne principal kinds of and fault finding on equipment made easy for the first time. No previous models, useful aooendires and index. experience needed. No mathematics used. FREE brochure from: Dept. Add 11- to cover Post and Packing P r ic e AE II, Radiostructor, 46 Market Place, Reading, Berks. WANTED M O D E L AERONAUTICAL PRESS LTD., Strongly built R.6.B or other good R/C plane, preferably suitable for multi. Neither radio nor engine required, but considered if necessary. Box 608. 38 CLARENDON ROAD, WATFORD, HERTS

BATTERIES for the MODEL MAKER Conditions of Sale M in ia tu re — S ilv e r Z in c V e n n e r T y p e H .IO S 1.5 volts 1.5 amp hour This Periodical is sold subject to the following conditions—That it shall not, without the written consent of the publishers, be lent, Size: Height...... 2 inches D · resold, hired-out or otherwise disposed of by way of Trade except W id th ...... 1.13 inches ΓΓΚΟ at the full retail price of 2 /-and that it shall not be lent, resold, hired- Depth . .63 inches 17/6 Post o n , or otherwise disposed of in a mutilated condition or in any Weight 1.25 oz. //- unauthorised cover by way of Trade; or affixed to or as part of any WILKINSON (Croydon) Ltd. publication of advertising, literary or pictorial matter whatsoever. T H E "AEROMODELLEfT 19 Lansdowne Road, Croydon, Surrey Phone: CRO 0839 38 CLARENDON ROAD. WATFORD, HERTS.

Tel.: VAN 7962 Tel.: 42407 Tel.: Stevenage 1713 r e l g l S M g l hhehibw» J. G. S. CLARKE HOWES MODEL SHOP HERTS HOBBYSHOP 4 PARK PLACE, 46 BROOKW OOD ROAD, 9-10 BROAD STREET, STEVENAGE NEW TOWN SO UTH FIELDS, S.W .I9 OXFORD New shop, new stock, keen service to meet MODEL ENGINEER AND STOCKISTS OF Everything for the Modeller. your demands. If it’s advertised, we have it, KEIL KRAFT, VERON, FROG, ETC. Mail Orders over 10s. carriage paid. Full range of all kits, accessories, engines.

Tel.: BLA 6159 Tel.: Reading 51558 Tel.: 22806 ΒΗΜΙΜ» k & M K » MODEL SUPPLY MODEL SUPPLIES R E D G AT E S STORES M O O R H E A D . 17 BRAZENNOSE STREET, MANCHESTER 2 I Hosier Street, St. Mary’s Butts, SHEFFIELD I /Vlonchcstcr's Main “Mecca” for every READING. BERKS make of KIT. ENGINE & ACCESSORIES. The North’s Largest Model Dept. BALSA. RADIO CONTROL EQUIPMENT, etc. Berkshire’s Modelling Centre Whatever the Model—W E STO CK IT

Tel.: BLA 3972 Tel : 420 THE MODEL SHOP LE-CORE BROS. JOHN W. BAGNALL 13 BOOTLE STREET. The Model Mecca of Kent MODEL CRAFTSMEN’S SUPPLIES MANCHESTER 2 264 HIGH STREET, SOUTH WALLS (ROAD) THE UP-TO-DATE SHOP WITH THE ROCHESTER, KENT Full range of Aircraft Kits—Engines— The 100 per cent. Model Shop since 1936 is COMPREHENSIVE STOCK well worth a visit. Sales and Service with R/C and Accessories. Mail Orders over 10s. Satisfaction. Mail Orders by Return carriage paid.

Tel.: 65591 Tel.: Shirley 5854 Telj 3382 a n E g g » SOLIH p h * KEN’S MODEL SHOP HOWBEL MODELS S. H. GRAINGER (N. Littler) NEWBOROUGH ROAD, SHIRLEY, SOLIHULL CALDMORE POST OFFICE. 57 RAILW AY STREET, Agents for all leading Kits, Trains, Engines NELSON, LANCASHIRE and Radio Control 108 CALDMORE ROAD We have a "FREE” model advice and Aircraft — Boats — Engines — Kits — Spares Advice without obligation — We w ill put instruction class every Thursday 6.30 you on the right track with aircraft, boats Accessories — Model Railways — Plastic Kits to 8 o’clock to all purchasers of Kits Model Racing Cars or railways. over 15/- in value.

Tel.: 42959 Halifax Tel.: 23522 NOTTINGHAM SOWERBY BRIDGE 81378 M ik t is L · ! * GEE DEE LIMITED RYBURN H. G. CRAMER LTD. MODEL SHOP 172A and B HIGH STREET 40 GOOSE GATE, 28 W est St., Sowerby Bridge, Halifax (Near High Street Station) NOTTINGHAM Model Aircraft and Boat Kits. Plastic Kits. Radio Control. Four shops in one. Everything for the aeromodeller at Everything for the Modeller. Model Railway, Model Aircraft, Fishing Nottingham's leading model shop H.P. Tetms on Goods over £ 10. S.A.E. for list. Tackle, Toys. IBBBQJBfla 112 February, I960

How-to-do-it SUPER GLOWPLUG ENGINES ETA "29" Mk.6 4.7 c.c. £7/1/11 FUJI "099" 1.6 c.c. £2/2/9 D.C. Bantam 049 0.8c.c. £1/14/10 FUJI *Ί5Μ 2.5 c.c. £2/7/3 Magazine of U.S. AM 049 0.8 c.c. £1/19/6 FUJI •‘19 * 3.25 c.c. £2/13/0 O.S. 29 R.C. 4.7 c.c. £8/3/4 FUJI ,,29*’ 5 c.c. £3/14/0 O.S. 29 4.7 c.c. £6/10/8 Glowchief 29 & 35 £6/8/9 Modeldom ENYA "IS*· 2.47 c.c. £3/9/9 COX Babe Bee 0.8 c.c. £2/11/3 ENYA “29" 4.8 c.c. £5/0/9 COX Peewee 0.3 c.c. £2/11/3 Read FLYING MODELS, ENYA 35 R.C. 5.7 c.c. £8/3/4 Thermal Hopper 0.8 c.c. £4/5/2 the only American magazine Send S.A.E. for LISTS of over 350 PLASTIC KITS devoted exclusively to JONES BROS, of CHISWICK model aviation! Every issue includes how-to- 56 TURNHAM GREEN TERRACE. CHISW ICK. W.4 Phone CH I 0858 (I min. from Turnham Green Station E s t . 1911. build data on new model airplanes of various types (with full-size plans wherever possible) . . . worth-while hints . . . photographs . . . how- to-do-it information . . . and features for sport a-plenty! Now published every month CARDIFF Annual subscription: (12 copies) £19 6 The Model Specialist Tel. : Cardiff 29065 including postage I PAY CASH FOR GOOD SECOND HAND ENGINES. SEND FOR LATEST PRICE LIST AND LEAFLETS :: :: 6d. postfree SPECIAL COMBINATION OFFERl Mail your order and remittance today to: K.K. FIREFLY. WITH D.C. BANTAM .049 G.P. ENGINE AND SUITABLE PROPELLER :: :: 0/10/0 post free ATLAS PUBLISHING & DISTRIBUTING Co., Ltd. NEW RANGE OF "MARINECRAFT" MINIATURE (Dept. A) MODEL POWER BOAT KITS IN STOCK 18 Bride Lane, Fleet Street, London, E.C.4 THE NEWEST KITS SILVER STREAK... . 125/8 FROG F/F TUTOR 3 9 ' ... 23/11 FROG 3.49 Ball Race . 79/2 FROG GLADIATOR ... 28/9 FROG 3.49 Plain... . 73 3 MERCURY M.E.109 ... 28/6 MERC0 29 . 119/6 FROG SCALE TEMPEST 48 2 MERC0 35 119/6 FROG C/L CHIMP 22' ... 14/6 A.M.IS ...... 57/10 FROG C/L HORNET 21* 24,6 A.M.25 ...... 66/5 S T A M P R O P S K.K. HALO 42' 19/9 A.M.35 ...... 69/6 K.K. CAPRICE GLIDER 15/9 NEW A.M. *049G.P. 39/6 TO OUR FRIENDS IN THE U.S.A. K.K. SPECTRE 41* Stunt 37/6 E.D. Bee I c.c. ... . 52/6 K.K. TALON 32' Combat 24/6 E.D. Hornet 1.46 . 54/4 contact K.K. GAZELLE 28' Stunt 19/10 E.D. Racer 2.46 . 76/9 K.K. DEMON 30* T/R ... 29/6 ROBERT ELIES NEW ALLBON QUICK START 435 EUCLID AVE.. APT. 24. SAN FRANCISCO 18 CONTROL LINE KITS CALIFORNIA ______CHAMP ...... 12/5 ENGINES IN STOCK JOKER ...... H / l PICADOR ...... 19/- LIGHTWEIGHT K.L.G.G.P.5/9. MARLIN...... 19/- Check your R.P.M. “ spot-on” with a MERCURY Lightning ... 5 / 3 SECOND-HAND ENGINES FROG A crobat...... 26/10 ED. Bee, S. Merlin. Frog 80— CONDOR (Frog) 29/3 a ll at 35/— each. E.D. Hornet, REV SPOT ENGINES Sabre, Spitfire at 37/6 each. r.p.m. indicator, 3/6d. post free TAPLIN TWIN 7 c.c. ... 168/- A.M.25 Frog 2.49, Frog S00 at FOX 2 9 ...... 120/- 42 6 each. E.D. Racer at 45/-. Order from FROG 0.49 G.P...... <49/6| Mile* Special 5 c.c. 105/-. KENLAND R E S E A R C H 22 CASTLE ARCADE CARDIFF 11, Butts End, Gadebridge, Hcmel Hempstead, Herts. THE NEW LOOK IN BATTERIES SPECIAL All R/C fans will welcome the reliability which is now possible when using D.E.A.C. low tension cells. POWERFUL :: :t STURDY :: » LIGHT For servo and actuator use these rechargeable cells arc without equal. IP DESIGNED BY GIG EIFFLAENDER Used by all the top line American and Continental Stars. RETAIL PRICE .... £6 6s. Od. including P/Tax 225 M.A. Cell is I in. x 11/32 in. and weighs *44 ozs. ... 4s. 7d. each 450 M.A. is I 11/16 x | in. and weighs 1*16 ozs. ... 6s. 6s. each All of these batteries arc the same voltage, 1*2 v, and will deliver this under load over long periods because of the very flat discharge curve A P A W 1 4 9 TRY A SET! RETAIL PRICE - - £4 6s. Od. including P/Tax YOU WILL NEVER USE SUBSTITUTES w Peter Chinn writes "the most powerful IS yet tested" j . ) . BRADBURN ALL ENQUIRIES TO: 76 MARKET STREET · WIGAN ?π Γ.ορςς" a f r d w o r k s t h f s t f r r o a d MACCLFSFIELD. ENGLAND Trade Enquiries Invited

Kindly mention AER O MODELLER when replying to advertisers new type multi-channel

fitttlflJu C U tX i D RADIO CONTROL UNITS Ψ TRADE MARK

Black Prince 6 This entirely new transmitter has been produced after months of exhaustive flying tests. The Standard Transmitter, the first of a new series, may be supplied up to 8 channels or as a single channel tone or carrier transmitter. Housed in identical cabinets, they are hand held using a 5 ft. detachable aerial. The self-biased switches fitted are easily accessible by both hands. Many unique features have been incorporated, including a neon voltage indicator. Complete tone stabilization due to feroxcube pot cores. Each potentiometer will only cover 100 cycles, and having set up, the transmitter will operate without further adjustment. Battery consumption has been cut to a minimum and many months of use are assured. Balanced weight distribution makes perfect handling. A detachable compartment enables batteries to be inserted without disturbing the transmitter. Size: 9 | in. x 6± in. x 3£ in. Weight Complete 5 lbs. Less Batteries 2£ lbs.

TRANSMITTER BLACK KNIGHT /1 Single Channel (Carrier) Transmitter. Price £6 18s. 9d. *r.c. P. Tot BLACK PRINCE /I Single Channel (Tone) Transmitter. Gi< e £11 Is. 4d. 1 Tut BLACK PRINCE I Four Channel (Tone) Transmitter. Black Arrow 6 Price £14 3». 4d. fete. P. T(J> BLACK PRINCE 6 Six Channel (Tone) Transmitter. The 4 and 6 Channel receiver is completely revolutionized with a new and absolutely reliable Price £15 9». lOd. ,r<. P. Tot relay and a super sensitive reed unit capable of operating with an input of only 2 volts R.M.S. R E C E IV E R S Using the new high gain Mullard transistors, transformer coupled and temperature stabilized, BLACK ARROW I developing 20 volts R.M.S. into the reed unit. Both reed unit and relays are fitted with fixed Single Channel (Tone) Receiver. contacts no adjustment being required. A low voltage supply of 22J volts for HT and IJ volts Pr.ce £7 lls.Bd. inc.P. Tox BLACK ARROW 4 LT at extremely low consumption resulting that quite small batteries may be used. The complete Four Channel (Tone) Receiver. receiver is mounted in virtually a crash-proof container. Price £14 12». 2d. iflC. P. Tat Size: 32 in. x 2J in. x 11 in. BLACK ARROW 6 Six Channel (Tone) Receiver. Weight: 8 ozs. Price £16 19». 5d. inc. P. Tot Illustrated Folders giving full technical details of all E.D. products are free on request. OCTAVE— Eight Reed Tuned Relay £3 Os Od.

BLEEP— Relay £1 4s. Od.

Multi Channel Servo Unit— £3 10s. I0d. Inc P. TAX Black Arrow /1

•ELECTRONIC DEVELOPMENTS (SURREY) LTD DEVELOPMENT ENGINEERS c a m . ϊ& Η ά ϊ is l a n d FARM RD. WEST MOLESEY.I SURREY) ENGLAND.

Made and printed in Great Britain by the Croydon Times Ltd.. 104 High Street, Croydon, for the Proprietors. I he Model Aeronautical Press Ltd.. 38 Clarendon Road, Watford. Herts. Published by the Argus Press ltd.. 8-10 Temple Avenue. London. L.C.4. to whom all trade enquiries should be addressed. Registered at the G.P.O. for transmission by Canadian Magazine Post. FOR THE KEEN YOUNG CRAFTSMAN These kits offer you the most for your money!

This tinrvAouv.hed phoiuffraph ... proves that these inexpensive kits build up into really beautiful models

The plane shown is a 21# Piper Family Cruiser made from a K K Junior F/S kit

sm m

i JUNIOR FLYING SCALE SERIES

There are 37 different models in this wonderful range including jets, fighters, light planes, and 1914 18 veterans

ALL PRICED AT 4/2 EACH except STUKA and SEA WITCH at 4 6 each The four models illustrated here are typical examples. The Keilkraft Junior Flying Scale Series contains many other equally attractive planes.

T H E RANGE IN C L U D E S Auster Arrow Lysander Attacker Beech croft Bonanza Globe Swift Avro 707A Cessna 140 Mustang Fiat GOO O H . Chipmunk Nieuport (1914 1918) Hawker Hunter Erco Ercoupe S.E.S (1914 1918) Gloster Javelin Fairey Gonnet Sop with Camel Mig IS Fairey Junior (1914 1918) Panther Messerschmitt ΛΛ.Ε.Ι09 Fokker 0-8 (1914 1918) N.A. Sabre Focke-Wulf 190 Percival Provost Skyray Spitfire Piper Family Cruiser Supermarine Swift Hawker Hurricane Piper Super Cruiser D.H. Venom Ju 87b Stuka Stinson Flying Station D.H. Sea Witch Lutcombe Silvaire Wagon Kirby Prefect (Glider)

SEE THEM AT YOUR NEAREST MODEL SHOP

THE GREATEST NAME

IN MODEL KITS r m m m

TRADE ENQUIRIES ONLY