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THIS ISSUE INCLUDES W. MUSCIANO’S C/L HAWKER HART · CYRIL SHAW’S ENVOY # BRITISH RECORD HOLDING A 7 SAILPLANE · A SPECIAL ARTICLE ON CHUCK GLIDERS WITH FULL SIZE PLANS · ALL OUR REGULAR FEATURES UT3 Digital Edition Magazines.

This issue magazine after the initial original scanning, has been digitally processing for better results and lower capacity Pdf file from me.

The plans and the articles that exist within, you can find published at full dimensions to build a model at the following websites.

All Plans and Articles can be found here:

Hlsat Blog Free Plans and Articles. http://www.rcgroups.com/forums/member.php?u=107085

AeroFred Gallery Free Plans.

http://aerofred.com/index.php

Hip Pocket Aeronautics Gallery Free Plans.

http://www.hippocketaeronautics.com/hpa_plans/index.php

Diligence Work by Hlsat.

PKJJENT THEIR^iATEST

3 ! b F , - 0 M £ * » Λ 4 * m . M i W i i

■THE GREATEST ADVANCES IN RADIO CONTROl

E.D. C O M PAC T E.D. REED U N IT ESCAPEMENT We offer this Unit separately, In response co many requests complete with circuit diagram of a suitable transmitter and receiver we can now offer the E.D. to enable the more technically- "Compact" Escapement minded to construct their own which has under half the tota equipment. This is in answer to area of previous escapements. many enquiries for such com­ The special features are : one ponents. hole fixing, redesigned magnet The reed unit can be supplied in system giving low current three different frequency ranges consumption and obviating which, when combined, will give up to nine channels. This should necessity for currency saving adequately meet the demands of the devices. multiple control enthusiast. Price £ 1 .2 .1 1 inch P.T. Price £5.0.0 inch Ρ.Γ

E.D. MK. II “ MINIATURE 3” RADIO CONTROL UNIT COMPRISING TRANSMITTER AND RECEIVER

The great success enjoyed by our famous Mk. I Radio Control Unit has now resulted in our chief back room boy. Mr. George Honnest Redlich. producing the " E.D. Mk. II Miniature 3 ” which still combines the three main features of range, reliability and safety against interference, but with reduced weight, size and battery consumption. A standard battery pack w ill give over 3 hours C O N T IN U O U S OPERATION with a receiver and batteries weight of only I0J ozs. We specially emphasize that deaf aid H A R D valves with a life of over 3.000 hours are used in the receiver. The transmitter is wired for dual purpose use and will operate either carrier or modulated receivers. Price—Complete, £18 . 10.0 inch P.T. Receiver, £11 . 10.0 inch P.T. Transmitter. £7.0.0 incl. P.T.

E.D. Mk. IV RADIO CONTROL UNIT, TUNED REED, 3 CHANNELS E.D. P O LA R IZE D RELAY Comprising transmitter, control box and receiver incorporating reed unit giv>ng o u tp u t fo r threo separate channels. The channel* can operate either Constant research into the design of relays for Radio Control has developed this new compact unit which is polarized by aticonal magnet escapements and o r e lectric motors. and employs a fully balanced leal armature. Convincing proof o f its stab ility and re lia b ility «as given when used in the Great stress has been laid on mechanical construction which eliminates recent cross-Channel success o f 9 hours duration under extrem ely adverse unreliable operation and h it and miss adiuetments. Unaffected by conditions. vibration, it stands up to rough usage. H A R O valves w ith a life o f over 3.000 hours are used throughout. In spite o f its robustness it is capable o f operating on current changes of P rice under I M A. The lig h t w eight o f the leaf armature enables it to Unit complete ...... Ω 5 . 0 . 0 in d . P.T. positively fo llo w signals o f up to 30 per second and is therefore ideally Receiver ...... £ 1 5 . 0 . 0 .. „ suitable for all types of pulse operation. Transmitter and Control Box £10.0.0 „ P rice 3 0 /-

ORDER THROUGH YOUR MODEL SHOP ¥1ELECTRONIC DEVELOPMENTS (SURREY) LTD raciTM m rnufs DEVELOPMENT ENGINEERS 1223 18, VILLIERS ROAD, KINGSTON-ON-THAMES. SURREY, ENGLAND. hi nit lit mention AKHOMODELLEH when replying to advertisers January, rg$2 Aeromode ller H ere’s proof* Mr. W. G. Piper of Tottenham and hit ton, Alan, are Monocoupe cnthunaitt. Mr. P. senior, flies a 40 (w ith Mills 0 75) and to date (20/II/S I) hat completed over 80 perfect flig h t· (no crashes o r major damage). Mr. P. junior, went for the 64 and w»th a M ills 1-3 fitte d has made over 120 perfect flights to date. Father and son are a fam iliar sight at Fairlop each Sunday, and w ill te ll you themselves just how highly they think of Mercury Kits, and why. Both Mr. Piper senior and ju n io r, have no special claims to aero- modelling beyond onthusiasm, which is Photo by but one moro proof that in the hands of E. Stoffcl average modellers. M ercury K its combine first-class performance with long working life.

MONOCOUPE 64 Builds in to 2 ' to I ft. scale m odel, fo r 1 4 -2 4 diesels. Ideal fo r E .O ., Radio Control equipment. 6 6 ' -

MONOCOUPE 40 Smaller version for O S to 0 87 c.c. diesels. 26 7 llli·/ «/ο it sh ou ld C H R IS L E A MERCURY MARTIN SAILPLANE SKYJEEP Mercury's latest, an intermediate pre­ choose M ERCU M A beautiful replica of contest 40" tow lin e sailplano, is fast a famous British light winning adherents everywhere. Specially The materials in Mercury Kits are so plane. 4 5 'wing span good, and so accurately and thoughtfully recommended as a follow-on from ft For 0 5 to 0-87 the Magpie. O / J prepared. diesels. Outstanding Mercury Models give " expert perlorm Ό the Mercury flying ance ” in the hands o f average m odelleis. scale senes, n n N ow V f . / Structurally. Mercury Models are ex­ ceptionally robust, so extra long flying life may be expected. Every Mercury Kit includes full-sited beautifully detailed plan and compre­ hensive building instructions. STINSON VOYAGER 42 For quality, performance, design and For 0-5 c.c. to 0-87 diesels. value. Mercury lead every tim e— and Came 1st and 2nd in All- there are models for all. Brits in R.A.F. F/F Scale Championships. I9SI N ow ★ni iu n iv %<<'i ssoim s slnuouncinfj another 28'8 MERCURY also manufacture a wide range of accessories fo r aeromodellmg. beautifully designed M e rc u ry su p er L it and finished. These include many C L accessories, special furl tanks, G P box spanner, etc Ask if Here >t the finest Kit yet to come from Ron MERCURY make it first Young's drawing board. M ercury's ace designer brings you a model with appearance and style great even by M ercury's classic standards o f design and quality. The photo shown here is of the actual model, not the original from which it is so faithfully scaled down. The M ercury Aeronca Sedan is a 6 6 ' job fo r 1-5 to 2-5 c.c. diesels and is perfect w.th radio co n tro l. W e have given this model terrific punishment before approving for kitting, and it has come o u t magnificently. Here indeed it the connoisseur's kit for all experienced builders. Price (me. P. Tax) 69 6. The Aeronca Sedan w ill be at your dealers from 31st lanuary. IT IS NOT TOO EARLY TO RESERVE Y O U R S N O W

n i i K c u n AERONCA SEDAN Ill l FANl |I1TK -JA \1 ΛΚ1 .Hast, IftW

TRADE DISTRIBUTORS r H. J. NICHOLLS LTD.. WHOLESALE. 308. HOLLOWAY AD.. N7. EXPORT : M E R C l IR\ (?ua£ct*f BUTLER. ROBERTS ft C O . LTD.. 4. DRAPERS GARDENS. E.C.2. Hi nil Iff mention AKROMODELLEH when replying to nilvvilim-rs Aeromodeller 2 January, 1952

THE IDEAL INTRODUCTION TO POWERED FLIGHT

“ vERorrs ** w LATEST " Span 37* Length 27* The “CARDIM I/ Λ grand little plane with a performance which it equal to any contest model in its class. Ideal for those who wish to make ii start in “ Powered Flight Easy construction from shaped parts and sta^e-by-stage working plan. Weight without engine 6/7 o r. Quality kit includes cut-out parts, ready-cut ribs, sponge rubber wheels, plan and all materials.

The “COIIOSETTE” K IT P R IC E A slick little lightweight version o f the larger “ VFRO SONIC 46*’. Of essentially simple design and K IT P R IC E const ruction, this appealing model is ideally suited for T h e “v i : k o m k \ h 4 « r the newcomer to modelling, and has an unmatched Λ graceful F.A.I. soaring sailplane with the “ Super- flight performance fo r its class. sonic” look ! Swcpi-buck wings and empennage not only gives supcib appearance but perfect towline stability and flight characteristics. Kit is complete with a ready-moulded plastic cockpit cover. Details VERON “ GOLD SEAL” STUNT TANKS given fo r “ A d a p ta tio n ” to Jetex 100 U n it Power. Stove enamelled and fuel proofed Large, 2J x 2 x l i ins. 6; f P.T. 1/4 Med., 2} x 1} x I in. 4/6 + P.T. lOd. N o. 3. Sm all. 30 e x . Class B. T .R . Tank. I f x l i x j i n . 3/6 + P.T. Xd No. 4. L a rg e Stunt, 21X 1} X { in. 4/6 + P.T. 1/ Small. IS c.c. Class A . T.R. 11 X11 X i >n. 3/6 + P.T. 9d. WHEELS The *KVSKOOTIK Lightweight unpuncturable Specially designed to suit ultra-lightweight R.K. 61 Radio Control systems Sorbo Balloon wheels with with the “ HIVAC” Thvratron Valves. Exceptional stability is due to the light alloy centres. Ideal for thick high lift w ing section. O n test the model lifte d 12 ozs. o f ballast w ith scale models. The most un E.D. Bee I c.c. after a straight take of! run o f approxim ately 20 yards. realistic balloon wheels ever The realistic take off. superb glide and life-like landing which can be utiributcd produced. Drilled for 16 to this Veron model make it completely revolutionary In the field of model and 14 S.W.G. Available aeronautics.______k i t in 3 sizes. Dla. { Price II ins. /. 3'8 Vue. P.T.) 2 ins .. 5/2 (Inc. P.T.) 2) ins. .. 7!\\ (Inc. P.T.)

Australian Distributors : Scientific Hobby Distributors. 350. Queen Street. BRISBANE.

(&ournemouth)ti.ve„ Noruiood Place.

Telephone i SOUTHBOURNE 2783 Kitt

★ BUD MORGAN Specialist THE BEST MAIL ORDER SERVICE. All orders for Balsa Wood and Kits packed with J 'x 3 ' hardwood plank to ensure good condition on arrival. Personal attention to all orders. Large stock enables quick delivery. All orders over £1 POST FREE, under, please add I/- to cover postace. C O D Orders welcome. OVERSEAS ORDERS FREE FROM PURCHASE TAX. My UP-TO-DATE PRICE LIST prke 3d., post free. * WHY NOT JOIN MY SAVINGS CLUB » SEND FOR FULL PARTICULARS *

J E T E X K IT S SECOND-HAND ENGINES FREE FLIGHT POWER For JETEX 50 M O TO R. A M C O 3-5 c . c ...... 5 5 /- Fro* Cirrus for 2·$ engines. 50* 29/6 ZY R A SPACE-SHIP— E.D. M k. IV ...... 4 5 /- Frog Fox. 4 2 ' 2 1 /- Complete with motor and fuel . 13/4 F ro* 100 .. 3 0 /- Powavan, 47* ...... • 2 S /- W ithout motor 7 / - E.D. Comp. 35/- Ladybird, 41* ...... 22/8 K.K. Grumman Panther 3/8 E.D. B e e ...... 3 5 /- Jnr. Mallard, 34' 14/4 K .K . H aw ker 1067 ...... 3/8 F ro* 500 ...... 5 0 /- Mallard. 48* ...... 2 2/4 K.K. MIG 15 ...... 3 8 Yulon 29 ... 50/- Skyskooter. 48' ...... 30/8 K.K. Sabre ...... 3 /8 Owat 5 c.c...... 35/- Frog Vixen ...... 1 5 /- K.K. Attacker ...... 3 /8 Bunch, G/P ... 45/- Veron Cardinal .. 17/8 A v ro 707b 7 / - 1 pay cosh or part cxchange for good second-hand fo r MY Flying Wing .v. 7 / - engines. W rite first fo r my offer. For FULL RANGE OF KITS send Price List, 3d., post free. Vam pire 50 7 / - THE CHALLENGER Jetcraft Hydroplane 7 / - The only ready-made control-line model RUBBER MODELS M eteor 50 ...... 10 Ί aircraft available, complete with Propeller. Frog Witch, 36' 1 2 1 0 H o t- d o g ...... 4 3 Lines. Handle, Spinner and nut spanner and 7 / - Frog Stardust. 40* 12/9 Jeticopter 50 E.D. BEE Engine, att fo r only 96/6 Post free. 4 11 M in-o-Jet 4 /3 Pixie, 23* PLANE and accessories, less engine 4 4 /- Gypsy. 42* 12/10 Fouga Cyclone ... * / l Veron Sea-hawk 8 /8 READY MADE PLANES fo r th e Senator, 32' 8 /9 Veron Thunder-jet 8 /8 Y o u n g s te r Ace. 3 0 * ...... 8/1 K .K . Skyjet 5 0 ...... 4 /7 Frog Interceptor Mk. V, complete with C ontestor ...... 28 8 PLASTIC RACE C A R ...... 18/11 geared winder in box -. ... 12/6 S e n tin e l...... 12/10 PLASTIC SPEED BOAT 15/3 Frog Raider, ready to fly , . 3/11 CONTROL LINE (both complete with JETEX 50 Motors) Frog Avenger, ready to fly ...... 2 /9 Frog Vanfiro for 5 c.c. motors 25/6 Frog Fury, ready to fly ...... 2/- Vandiver 15/- JETEX MOTORS Frog Aeroscout Glider ...... 74d. Mercury Monitor, 39* ... 22/4 13/4 JETEX 50—Complete outfit NEW Ml NIC NOVELTIES for XMAS Mercury M usketeer ...... 2 4/9 M o to r separate 9/2 Minic smallest Electric Railway, operates on Jnr. Musketeer...... 20/10 Jctex 100. com plete 27/5 2 U cell batteries, complete 39/6 Veron Kits. Jetex 200, com plete 38 9 Focke-W ulf ...... 23/10 52 9 Musical C lo ckw o rk Saloon Car, plays Jetex 350, com pleto Happy Birthday and other tunes 29/6 Panther, 41* 30/6 MR. PUFFIN, w ho walks and flaps his P hilibustcr, 28J* ...... 28/8 JETEX FUELS and SPARES wings (clockwork) ...... only 6 /6 Bee-Bug. 2 2 ' 1 4 /- Fuel for SO ... V-a pkt. M idget Mustang, 2 4 ' ...... 25/8 Fuel fo r 100 2 /8 a p kt. MODEL GALLEON KITS Minibuster ...... 18/4 Fuel for 200 2/9 a pkt. A rk Royal. 1 9 * ...... 62/6 Keilkraft Kite. Fuel for 350 3/3| a pkt. Golden Hind. 21* ... S8 6 Wick for the above ... 7}d. Scout Team Racer. 2 0 " ...... 27/6 Santa M aria. 19* ...... 49 6 Skystreak. 26' ... 11/7 Gauzos fo r 50 2 IJ fo r 36 The above Kits are complete with ready Skystreak. 4 0 * ...... 12/10 Discs fo r 50 6d. pe r doz. carved hull, silk screened coloured panel, Ranger ...... 12/10 W ashers fo r 50 ...... 8 )d . fo r 12 printed tails, rigging, paint, varnish and cement, anchor, and name plate. GLIDERS FULL RANGE OF FUEL A N D SPARES Mercury Martin, 40* 8/3 FOR JETEX MOTORS. X-ACTO KNIVES AND TOOLS No. I Knife, complete with No. 11 blade 3 / - Verosonic, 46' ...... 12/10 Coronette. 26* ... 4/3 KEIL KRAFT SCALE KITS N o . 2 Knife w ith N o . 22 blado 3/6 No. 5 Heavy Duty Knife 6 6 Norseman. 6 4 ' ...... 2 4 /9 Globe Swift. 20' ...... 3 /8 Chief. 64*...... 22/8 Erco Ercoupe. 20* ...... 3,8 No. 51 Sec with 6 blades 5 /8 N o. 52-Jarger Knife and 6 assorted blades 6 /9 Soarer Major. 60* 14/1 D. H. Chipmunk, 20* 3 8 ...... Soarer Minor. 48' 9/9 Fokker D-8. 1 6 *...... 3/8 W O O D C AR V IN G SET N o . 77 2 3 /- Soarer Baby. 36*. 6/1 Percival P.56. 19* ...... 3/8 SET N o . 78 includes N o . I and N o . 5 Invader. 40* 7/11 Luscombe Silvaire, 21' 3/8 knives, gouges, punches, ro u te rs and Cadet. 36' 4/11 Beechcraft Bonanza, 20* 3/8 an assortment of blades ... Price 37/6 Cub (also Jetex 50) 3/1 Piper Super Cruiser 3 /8 TOOL CHEST No. 82. A comprehen­ Frog Diana, 36* . . 9/- Fairey 17. 20* 3/8 sive kit in polished wooden cabinet. Pnnce, 60* ... 25/- Stinson Flying Station Wacon. I9J' 3/8 All three knives and a full range of Piper Family Cruiser ... 3/8 cutting blades ...... Price 3 0 /- SCALE POWER KITS Cessna. I 9 i* ...... 3/8 N o 86 X -A C T O T O O L CHEST. The K.K. P. Super C ruiser, K.K. Cessna 170, Auster Arrow. 2 Γ ...... 3/8 desk drawer workshop ... Price 84/- K.K. Luscombe Silvaire— all at 22, 8 post free. Fairey Junior, 18* 3/8 Monocoupe. 64* ... 66/- Scnd for Illustrated Price List for a full Monocoupe. 40' ... . 26/7 A small tube o f Balsa Cem ent w ill be description of these wonderful hobby tools. included with every 3/8 kit to cover Stinson Voyager ... 26/7 excess postafe. FULL RANGE OF SPARE BLADES IN STOCK. Chrislea Skyjeep ...... 26/7

ENGINES IF Y O U ARE W O R R IED A B O U T XM AS PRESENTS. E. D . Bee I c.c...... REMEMBER I STOCK THE FOLLOWING GOODS :— M ills -75 c.c...... TRIX TRAINS and CONSTRUCTIONAL KITS. M ills *75 c.c. w ith cut out GRAHAM FARISH TRAINS. MINIC CLOCKWORK E.D. Racer 2-46 c.c...... A E R O - TRAINS. HOBBIES FRETWORK SETS. F ro * IS O ...... MODELLER SEND FOR FREE ILLUSTRATED PRICE LISTS OF THE Elfin ·5 c.e. New A N N U A L ABOVE GOODS—and REMEMBER MY RETURN OF POST Elfin I -49 c.c...... 1 951 n o w SERVICE FULL RANGE OF ACCESSORIES FOR Elfin 2-49 c.c...... a v a i l a b l e AIRCRAFT IN STOCK, FUELS. CEMENTS. DOPES, E.D. Comp. 2 c.c. Price 10/6 WHEELS. BALSA W OOD. PROPELLERS, ETC. D. C. 350 ...... p o s t f r e e . New A M C O B.B. 3-5 c.c. SEND FOR MY PRICE LIST GIVING DETAILS OF ALL THE Fro* 5 0 0 ...... BEST FIRMS' PRODUCTS. Price 3d. E. D . M k. IV ...... SEND for NEW KEIL KRAFT ILLUSTRATED LEAFLET— FREE. Tel. 22and22a C astle A rcad e, C A R D IFF 8 0 8 5.

K in d ly m ention AEROMODELLER tchen replying to advertisers 4 r w ill teach you l^*U*e**™r '

;ιττ They said ------C O M h N “IT CANNOTΪ ε 1 J Λ® R A T ϋ L A T i ON S! τ/ ϋΤ ΙΤ WAS d JJ e E "

“* say that you arc keen to b « °8 * * mCSSagc 1 Wou,d and financially. γ ου «Γ_ * ** your P°siti°n, socially no., lf.h .,L j;r„ " d’'“ d0‘0” ,K"*·'»"'» VOH. ' ^r dsc ls Crossed and / can help

By post, in your own time, one of my specialist Tutors will Qualified by Πνο^;„ . mm r f i j . Profi-vijonal standi’,!! rh8tis 8 distinction that r yr r ubicct UP t0 DiP,oma ;Lh^ ? m a,‘ >·8 m an w ho H ,ne a,,d m o n e ta ry rew ard, immediate action id rhl*· Few who take g . I hat I personally guarantee. For your Tutor will I O ° u arc one o f th«- *£β1Γ d rfa m > in to re a lity , rather than later) jim lfu w^° will one day (sooner be a person with an understanding of human nature. He message of cncouraeem^r^' Ur .“ η^ ',ιυηχ' then read this — * u m o f promise. will be interested in YOU AND YOUR CAREER. WHICH SUBJECT FOR YOU? Accountancy Exams. ^ ou arc wondering if it can apply to you-what it costs Architecture Languages Aviation (ling. & Wire'ess) Mathematics and so on. Write to me personally. Send me that Coupon. Book-keeping M ining—A ll Subjects Mechanical Engineering Building, Architeaurc & C le rk o f W orks Plastics Carpentry & Joinery Police, Special Course C h e m is try Quantity Surveying Radio Service Eng. C ivil Engineering Salesmanship GOVERNOR Secretarial Exams. A ll Commercial Sunjccts S h ip b u ild e r g Commercial Art S horthand (P itm a n ’s) Diesel Engines S urveying Draughtsmanship Short Technical Courses Electrical Engineering Telecommunications Gen. Cert, of Education Exam Television and Wireless Heating and Ventilating Transport Exams. Inst, of Housing Viewers, Gaugers A Inspectors Jigs, Tools and Fixtures Works Management jSjfiS·) Journalism and many others

φ π τ τ τ π ι To the Governor, Dept. A H9> The Bennett College, Sheffield, England,

S ■ r i would like to have (at no cost) your prospectus and . .(subject) particulars of — — ‘ w r it s ' in ' b l o c k ' lit^ krs '

The BENNETT N A M E . . . ADDRESS

COLLEGE_ A G E { i f under 2 1 ) . . . . _ _ _ J

Y o u r 2 n d 0 PPort^ L ,.,.„, Hi mil if m e n i w n A h n · January, ig$2 5 Aeromodeller

J i’i nevex too Cate t o S l i n g — Cheap Rates at Public Call C O LN E 996 Boxes start at 5 p.m. We are available till 8 p.m. W e axe atwiup at i/oux Sewiee

FLYING SCALE GLIDERS CONTROL LINE ENGINES Co«b ACCESSORIES CONTROL LINE ' Price WHEELS ACCESSORIES RUBBER K.K. Chief 6 4 ' ... 22, 8 K K. Phantom Mite 16'14/1 Allbon D a rt -5 c.c. 65/2 K e ilk ra ft K.K. Invader 40’ . 7/11 S o lid W h e e l...... Mercury Adjust· K.K. Phantom 2 1 '... 22/8 M ills S ·75 c.c. 67/3 K.K. Streamlined alyne Handle 6/8 Li. scorn bo Silvairo 3 /8 K.K. Mlnimoa SO' 8/7 K.K. Scout Team K.K. Soarer Baby 36' 6/1 M ills P -75 c.c. 61/2 lidia. ... 1/6 "Verogrip" C/L Cessna 3 /8 Racer 20' 27/6 Beechcraft Bonanza 3/8 K.K. Soarer Minor 48' 9/9 E.D. Bee I c.c. 52 6 2’dia. ... 2^5 Handle ... 4/7 K.K. Soarer Major 60*14/1 K.K. Skystreak 26 26 H /7 Mills 1-3 c.c. 91/8 2J' dia. ... 3/8 K.K. ISO' lines 2 /6 Piper Fmy. Cruiser 3/8 layttrate : Piper Super Cruiser 3/8 K.K. Cadets 30* 4/11 K.K. Skystreak 40 40* 12/10 A llbon Javelin Sorbo Wheels (Stranded) 100' 6/- Globe Swift ... 3/8 K.K. Cub 20' 3/1 K.K. Stunt King 36* 22/8 I 49 c.c. . . 68/3 Mercury Gili Chopper IS/— 11' dia. ... 3 8 (Stranded) 70' 4 /3 Porc.val P.56 3/8 K.K. Stunt Queen 40* 25/8 Elfin I 49 c.c. ... 59/6 2* dia. ... 5/2 Lightw eight IOO'4/3 D. H. Chipmunk 3/8 M ercury Norseman 24 9 K.K. Ranger (Team M ercury Mae pic 24’ 4 11 Frog ISO 49/6 21* dia. .7/11 Lightweight 70' 3 /- Fairey Junior 3/8 Racer) 24* 12/10 Pilots fo r team Faircy 17 3 8 Mercury Martin 8 3 E.D. Mk. II 2 c.c. 57/6 M.S. A ir Wheels Fro* Prince 60* ... 25/- Mercury Jnr. Monitor 17/5 E.D. 2 c.c. Comp. racing 3 1 Auster Arrow . 3 /8 2 ' Superlite 8 6 6d. Veron Veroionic 46* 11/7 M ercury M on ito r 39* 22/4 Spec. 6 0 /- Large Bellcrank Fokker D-8 . 3 8 21* Supcrlite 11/3 Small Bellcrank 4d. Stinson Flying Veron Coronette 26' 3/11 M ercury Jnr. Mus- Elfin 2-49 c.c. 70/- 2 Standard 12/3 Frog Diana 36* ... 9 / - Speed Bellcrank 4,1. Station Wagon 3/8 kctcer 28' 20 10 E.D. Mk. Ill 2-S c.c. 2* Standard 17 5 Elevator Horn 4*d. 3/8 Erco Ercoupe . RUBBER-POWERED Mercury Midge 12* 6/5 Secjes II 72/6 3* Standard 22 7 Control Horn 3d. Piper Cub 7 /4 4 ' Standard . 27 6 K.K. Playboy 2 0 ' ... 4 / - M ercury M k. 1 Team E.T.A. 19 (G.P.) and A e ro m o d e ls Tanks (Stunt K.K. Orion 23" . 4/3 Racer 24* 22/4 3 18 c.c. 124/5 BALSA T.R.) Hawker Fury 6 8 K.K. Ach.llos 24' . . 4/11 Mercury Speedwagon 17/5 6 8 E.D. Mk. IV 3 46 KNIVES Team Race 30 c.c .3 /8 S.E.5A K.K. Eaglet 2 4 ' ... 5 /6 . 3 4 Miles Magiste· 6/1 Mercury Musketeer 24 9 c .c ...... 7 5 /- K.K. Knife Blades 6d. Team Race IS c.c K.K. Ajax 30' ... 7/4 6 1 Leopard Moth 6 1 Veron Focke - W u lf 23 10 D. C. 350 3 S Mercuryc.c. 66 8Handle 2 /- Baby Bat. K.K. Aco 30* ... 6/1 Veron M idget Mus- M ercury Blades 6d. Large Bat. 7 4 Proctor 20/9 K.K. Competitor 32* 8/7 Fro* 250 2-5 c.c. 7 6 /- Messenger . . tang 2 4 ' . Ragg Balsa Knife 3 /9 F.G. Stunt— 20/5 K.K. Senator 32' 6 9 25/8 Amco 3-5 c.c. 97/6 Small 4 /7 Auster 18 7 Veron Sea-Fury 251' 27 6 Amco 3-5 c.c. (G P)97/4 Veron Balsa Knife I 3 K.K. Gypsy 4 0 ' 12/10 Mulricraft 5 10 Medium 5 6 S kyleada K.K. C ontester 45{* 28. 8 Veron Wyvern 251 28,8 4 8 Amco ·87 c.c. . 72/6 Studiette Knife 2/6 Large Junior Series 2 / - Mercury Maybug 32* 9/6 Veron Philibustcr 28J 28 8 F ro* 500 . 78/9 MS.— 16' Series . . 2 /6 Fro* Goblin 24' 5/6 Veron Spitfire 271' 33/7 E.T.A. 29 149 5 GENERAL Larga 5 / - Veron Rascal 2 4 ' 5 /6 Veron Panther 4 Γ 30 6 Small 3 /6 Veron Goblin 20' 3/11 Amco 3-5 B.B. 115/- ACCESSORIES JETEX Veron Bcc-Bug 22* Mercury Press. Veron Sentinel 34' 12/2 1 4 /- Yulon 49 (GP) 124/5 G low Plugs ... 7 /4 Feed Vampire 50 7 / - Veron Fledclin* 24’ 8/3 Challenger (ready to Test Bench 16 1 Large 5 4 Vampire 100 10/7 Veron Skylark2l 5/6 fly) Ι 3 Γ ...... 4 4 /- Dope Spray .. 3 6 5 /6 M eteor 50 JETEX UNITS Medium 10/7 Fro* W itch 36 ‘ 12/9 Skyleada Curtiss Fuel Filter 2 /5 Free Flight Tanks K.K. Sabre (50) 3 8 F ro* Saturn “ 30 ” 12/10 Jetex 50. 13/4 U -bolts fo r Bee 1, 6 3 1 K.K. MIG 15 (50) 3 8 Hawk 24' 1 9 /- K .K ...... U-bolcs Amco M.S. (large) 3 6 Hawk 1067 3 8 M ercury M k. II Team Jetex 100 27/5 FREE-FLIGHT Jctox 200 38/9 3 5 ...... 1/6 M.S. (sm all) ... 2 '6 V e ro n (Jetex 50) Racer 17/4 Wheel Collets 8d. Sea Hawk 6 8 Veron Stentorian 72" 84/11 Jetex 350 52/9 Veron Minrbustor 18 4 E.D. T im er 12/6 RADIO UNITS Thunder-Jet ... 6 /8 Veron Skyskootcr 4 8 ' 30/6 Frog Vanfiro 29/6 Jetex 50 (m o to r Emdcc T im er 7 '4 E.D. Mk. I U n it A ttacker 6 /8 Veron Martinet 36‘ 25/8 on ly) 9/2 Emdec D/T 6/- Sabre 6 /8 Veron Streaker 37* 24/1 Elmic Diesel . 13/5 £17.19.9 Good Second-hand Eng.net ALL JETEX SPARES E.D. Mk. Ill Unit A v ro 70 B 7 / - Veron Cardinal 17/8 taken in part exchange. Elm.c D.T. 6 9 Frog Strato D. 42* 17,.'6 £9.17.11 K.K. Cut-Out 4 4 Trans- Frog Janus 4 4 ' 17/6 SECOND­ Kwickglow Adap­ E.D. Mk. 1 POWER m ittc r £6.1.0 Frog “ Powavan" 47* 25 6 J E T E X K IT S to r 1/18 FREE-FLIGHT FrogFirefly(BipJtne)36’ 22,6 HAND E.D. Mk. 1 Receiver Dursjet (for 350) . . 20/5 Undercarriage M e rc u ry E.D. Radio Queen 8 4 ' 85. - ENGINES Box.. 6d. £9.12.3 Mijet (for IOO) 7/9 E.D. Mk. 1 Escape- Monocoupe 40* 26/7 Halfax Javel.n SO 27/6 E.D. Bee 32/6 Undercarriage 2/5 Jet-Ho Hydroplane ment £2.18.11 Monocoupe 60" 6 6 /- K.K. Pirate 34' 14/8 E.D. Comp. Special 37/6 Fuel Funnels . 3 /3 Stinson 105 ... 26 7 KK. Bandit 44· 22/8 (fo r 100) 8/1 A lto n Fuel Cans 3 / - E.D. Mk. Ill Trans- Amco 3·5 (GP) 4 5 /- mitcer £5.14.9 K.K. O utlaw 50’ 27/6 Vampire 50 7 /- Dope Brush 6d. K e ilk r a ft Amco -87 32 E.D. Mk, III Receiver K.K. Slicker M ite 32* 11/7 Vampire 100 10/7 Finishing Brush I/- Piper Spr. C ruiser 22/6 K K. Slicker 4 2 ' 21/5 Elf.n 2 49 4 0 /- £1.14.5 Cessna I7D 22 8 Race Car (fo r 100 o r Fucl Tube 6d. E.D. M k. Ill K.K. Slicker 50’ 30 6 Elfin 1 49 35 (all sizes) Escape- Luscombc Silvaire 22 '8 200) 14/9 ment £1.2.11 K.K. Super Slicker 60' 42,9 Arden 099 c.C. 5 0 /- K.K. Southerner 60' 48/11 letcraft Hydroplane K.K. Spinners X F G I Valve £1.1.4 A e ro m o d e ls D.C. 350 4 5 /- Autocrat 42/9 K.K. Southerner M ite 12/10 (fo r 50) ...... 7 /- (screw-on)— Allbon Arrow 3 5 /- Proctor 42/9 K.K. Ladybird 41' 22/8 Flying W in g (fo r 50) 7 / - PROPS CONTROL LINE K.K. Junior 60 6 0 ' 48 3 Meteor 50 . 10/7 Elfin 2 49 (new) U '. 2 /9 ; I f . 3/1 : K.K. Truflex K.K. Falcon 96’ . 131/5 6 5 /- V e ro n H ot-D og (fo r 50) 4 /3 (radial mount) I f , 3/1 ; 2*. 3/8. (Plastic) Focke W u lf 190 23/10 Mercury Jnr. Mallard 14/4 E.D. Mk. IV 5 0 ' Jeticopter 50 7 / - S upersonic Dia. Pitch Spitfire 22 33/7 M ercury Mallard 48* 22, 4 Frog 250 57/6 8 ' x 4* ... 4 /3 Sea Fury X 27/6 Mercury Chrislea leticopter 100 10/7 Ι Γ . 3/1 ; I f . 3 8 ; Frog 100 3 0 /- 8 ' X 6 ' ... 4 7 W yvern 28 8 S k y je e p ...... 26/7 ^ota-K ite 10/- IJ *. 4 / - ; 2 '. 4 /- . Albon D a rt ... 4 0 /- 8 ' x 8 ' 4 /7 M idget Mustang 25 8 I/- postage and packing Skyjct 50 4 /7 A ls o — A ll Fuels. 9 l 'x 4J* 4 I I S kyleada fo r a ll o rd e rs u n d e r 3 0 /-. Skyjet 100 6 9 Every engine is care- Dopes, Cements. 9T x 8 ' 5 /2 Curtiss-Hawk 1 9 /- Send 3d. for full list. Skyiet 200 9/2 fully checked, tested. Props, etc. 10' x 8* . 6/1 7 ' x 8* ... 4 /3 E'ectric Motors. I I * x 51* ... 6/1 Electric Train Sets. 14* x 6 ' 12/10 MODEL Fretwork Sett. Col- E.D. Plastic SERVICE icon Kits. (Hobbies Dia. Pitch ,®ί and K.K.) and all 61* x 7 ' .. 2 /7 modelling goods 7 1 'x 6 ' 2 /7 always in stock. 8 1 'x 9* 3 / - 9 ARCADIA, COLNE, LANCS. 91* x 6 ' 3/3

Kind It/ mention AEROMOUELLEU when replying to advertisers January, ' 95s Aeromodeller 6 λ*ο® a ? ΐ ο ϊ

Britain's vital need today is for men to join the Royal Air Force for flying duties now. Hundreds have already come forward. Hundreds more are needed. If you arc keen, fit and ambitious there’s no reason why you shouldn’t be among them. Those selected for Pilot or Navigator under the new Aircrew Scheme will gain Commissions when they successfully complete their initial training. Good pay — good prospects Send for your copy N O W The new, higher rates of pay are specially attractive and there’s extra pay for those who fly. Your training is so comprehensive and thorough, and promotion TO: ROYAL AIR FORCE, (A.M.2JA.) V IC rO R Y HOUSE, LONDON, W .C .2 . Please prospects arc so good that you can be earning over send d e ta ils o f lif e in the R .A .F . {Tick which you reqwf*) £1,000 a year (including marriage allowance) in less (A) In th· A ir | j (B) On th· Ground | ^ than 8 years from joining. And, of course, all normal u

living expenses arc free, and there’s a full, pensionable * N A M E ...... career ahead of you. If you join for an 8 years (short service) engagement you qualify for a generous ADDRESS gratuity, £1,500 for Officers and up to £600 for N.C.O’s. Send the coupon today for full information. AGE.. (Applicant, from firilish h its only)

★ If you arc 14-17 — and keen — join the Air Training Corps ★ January. 1952 7 Aeromodeller

It is by «pvcialisinic that modellers become experts in their field of flying. As experts they become more ai d more exactinc in their choice of materials, and are therefore levs easily satisfied. Perhaps that is why so many world-famous names in the world of competitive model flying choose to deal with us exclusively. And if wo can please tiro experts we can equally well satisfy the demands of the average aeromodeller.

lauih lor it in I'lnay Hot. \n . 7 . MERCURY MARTIN Over 130 hits: over 400 item* o f materials MERCURY and accessories: 19 CHRISIEA SKYJEEP motor*: radio-control: η ο Ύ ο η s K.K. PIPER SUPER CRUISER • FLYING SCALE Now D.C. 350 (5 5 /-) 66 8 Useful information. (5 4 /-) 66 - Monocoupe, 64' Allborv D art (as available) (52 6)“ 65 7 • C/L TOP LINERS Well illustrated. Chrislea Skyjcep (24/3) 29 7 Send 3d. in stamps Mills S.75. 0 75 c.c. (55 - I 66 9 MERCURY Monocoupe, 40* (219) 26 7 (72 6) 72 6 and large S.A.E. E.D. Mk. III. 2 46 M k. II Team Racer (14,4) 17/6 Stinson. 105' (23 6 ) 28 8 E.D. 3 - 4 6 ...... (72 61 7 5 /- Musketeer. 48' <20 3) 24, 9 K.K. Elfin 1 - 4 9 ...... (47/6) 59/5 Piper Super Cruiser. Midge, 1 2 '...... (5 /3 ) 6 /5 ># ------· MATERIALS E.D. Bee I c.c...... (47/6) 52/6 K.K. Cessna, Luscombe, Frog I * S 0 ...... (40/ ) 4 9/6 m Large stocks el- Silvaire. each ... (18 6 ) 22/8 Stunt Queen ...... (21/-) 25/· m ways available In· All Rubber and Jetex at (3/-) 3/8 Γ s κ |> II Λ R €2 A I \ s Ranger T. Racer ...... (1 0 6 ) 12/10 eluding Solarbo. VERON Panther ... (25/-) 30/6 γλ Dunlop, Cellon. • RADIO CONTROL A good selection o f secondhand reconditioned M Fuels. Tissue, E.D. Equipment as advertised motors in first-class condition is always • FREE-FLICHTERS Plyw ood. Piano from stock. IVY Lightweight Hand available. It is best to buy personally where K.K. Super Slicker (35/-) 42/9 Wire. Cement. Transmitter (£3.10.0) £4.7.6 possible, although a representative range M ercury M ullard ... (18/3) 22/4 HIVAC XFGI 17/6 £1.1-4 αροears in No. 7 Easy Ref. Frog Powavan (21/-) 25/6 • HOME ORDERS • SAILPLANES Add I - postage and packing up to Mercury Norsemen A.2 (20/3) 24 9 10 - : 1/6 up to 4 0 /- ; over 4 0 /- HENRyj. NICHOLLS LTtt M ercury M artin, 40* (6 /9) 8 3 post free K.K. Chief A.? ... (18 6) 22 8 • OVERSEA ORDERS 308, HOLLOWAY R 0 A D, L 0 N D 0 N, N.7. AII goods free of P/Tox. Delivery Invader. 40' (6/6) 7/11 charges— add S'*,, on engine orders. · 0 P i N A U ° A Y . Two minutes from K.K. Soarer M inor 48* (8 - ) 9/9 NOWth 4272______S A T U R D A Y Holloway Road U**d 10% on lis t orders.

CL £igMuteigM

To obtain an accumulator of long life, yet light in weight and of very small size is longed for by all Model Engineers. The silver zinc Vcnner Lightweight Accumulator which combines all these qualities is now available. Note these essential features :—

• LONGER LIFE · GREATER STRENGTH • SMALLER SIZE · IMPROVED EFFICIENCY • LIGHTER WEIGHT · LESS M A IN T E N A N C E

Write now for Leaflet VA006 3 A

HALF THE SIZE AND THIRD THE WEIGHT WITHSTANDS |u TREATMENT OR oZ/g h tw eight m i s u s e . r ALKALINE ACCUMULATORS (Dittributor* for London and Home Counties : The Dart Trading Co. (Engineering) Ltd.. 173, Sloane S treet, S .W .I. Tel. : SLOanc 8522.

VENNER ACCUMULATORS LTD.. KINGSTON BY-PASS, NEW MALDEN. SURREY Telephone : MALdcn 2442 (6 line, Aeromodeller 8 January, 1952

VVOBLB J R u MI ORBW \llllrt V d g l S e r v i c e

W herever you live, if you ere not served by a Model Shop in your district, order with confidence from my Mail Order Dept. Return Pottage Guaranteed. Five Star Reason! why it is to the advantage of Overseas customers to use my Mail Order Service ;— i f I. Purchase Tax. AH Overseas orders, including ALL Forces Overseas, are FREE of Purchase Tax. i f 1. Despatch. All Orders are despatched on day of receipt and acknowledged per Air Mail. i f 3. P acking. Guaranteed to stand passage to any p a rt o f the W o rld . i f 4. N o D e la y. As a Licensed E xporter I can supply direct. i f S. Currency. Correct rates of exchange given to foreign currency.

INTERNATIONAL MODEL ENGINES Order in comfort—at home AIRCRAFT D ie se l P.T. MERCURY MODELS (cone.) M ills 0-75 c.c. 5 0 /0 + 10/9 G lid e rs P.T. Mills 0-75 c.c., with KEILKRAFT KITS R u b b e r P o w e re d M o d e ls P.T. Fairey ...... 7 /4 + 1/8 cutout 55/0 + II/» Chuck Gliders P.T. Maybug ...... 7 / t + 1/9 Vanda ...... » /4 + 2/1 E D. Bee I c.c. 4 8 / 0 + 4 /6 Prince ...... 20/4 + 4/6 Vega ...... 1/3 + 3d. Free Flight Power Mills 1-3 c.c. ... 75/0 + 16/1 Spook ...... 1/4 + 4d. Elfin I 49 c.c. 4 7/4 + 1 1 /1 0 Jr. Mallard ... I I / » -f- 2 /7 Rubber Powered Models Polaris ...... 2 /4 + 7d. Mallard ...... 11/3 + 4/1 Frog ISO I 5 c.c. 4 0 / 4 + 9 /0 G oblin ...... 4 /4 + 1/0 E.D. Mk. II 2 c.c. ... 45/0 + 12/6 G lid e rs Stinson ...... 21/» + 4/10 Venus ...... 1 4 / 4 + 3 / 2 2 /4 7d. Monocoupe 44* S4/0 + 12/0 E D. Comp. 2 c.c. 49/4 + 10/6 G ib ...... + Witch 10/4 + 2/4 Elfin 2 49 c.c 5 6/0 + 14/0 4 /0 lid . Monocoupe 40' ... 21/9 + 4 10 C adet ...... + Stratosphere 17/4 + nil E.D. 2 46 c.c. Racer 6 0 /0 + 12/6 Soarer Baby SO + l / l G.H.3. Skyjeep ... 21/» + 4/10 8 /0 1/9 Control Line Power Free Flight Power E.D. Mk. IV 3 46 c.c. 6 0 /4 + 14/6 Soarer Minor + D . C. 350 3 5 c.c. 7 0 /0 + 17/6 Soarer Major H /4 + 2 /7 Jr. Monitor ... 14/3 + 3/2 Frog 45 2 5/» + 5/» 4 /4 1/5 M o n ito r ...... 18/3 + 4/1 Strato D ... 14/4 3 /2 G lo Plug Invader ...... + Amco 3·5 c.c. ... 9 8/4 + 23/6 7 /0 1/7 Jr. Musketeer . 17/0 + 3/10 Janus •4 /4 3 /2 M inim oa ...... f E. T .A 19 9 9/4 -*-24/11 C hief ...... 18/4 + 4 /2 Musketeer ... 20/3 + 4/6 Vixen 12/4 + 2/8 Team Racer ... 18/3 + 4/1 Powavan ... 21/0 4 /6 Frog 500 64/4 + 14/3 Rubber Powered Models + Frog 500 Spark 6 9/9 4- 15/3 4 /0 + lid . Midge ...... S/3 + 1/2 Fox 17/0 + 4 /0 Pixie ...... Firefly 18/5 + AH above engines in stock and Playboy ...... 3/3 + 9d. Speed wagon 60 22/4 + nil 4/1 Mk. 11 Team Racer 14/4 + 3/2 available (or immediate delivery. Achilles ...... 4 /0 + lid . Control Line Power The following engines are stocked Ace ...... SO + Van fire ...... 24/2 5/4 l / l VERON MODEL AIRCRAFT when availsblo :— Senator ...... 5 /4 + 1/3 Dart 0.5 C.C. . 52/1 + Ι3Ί A jax ...... 6 0 + 1/4 G lid e rs LAWS B B- Amco 3 5 c.c. 92 4 + 2 2/6 C om petitor 7 0 + 1/7 Verosonic . »/6 + 2/1 Babette R.P...... 4 /4 Javelin I 49 c.c. ... 54/4 + 13/9 Gypsy ...... 10/6 + 2 /4 C oronetto 3 /3 + 8d. E.T.A. 29 ...... 119/4 + 29/6 C ontestor 23/6 + 5/2 BOOKS Piper Cub ... 4 /0 + I / 4 Rubber Powered Models Aeromodeller Annual 10/0 Je te x Goblin ...... 3/3 + 8d. letex 50 Motor ... 7/4 + 1/8 Flying Scale Jotex 50 O u tfit . 10/11 + 2 /5 A ll Models 3 /0 + 8d. Rascal ...... 4 /6 + 1/0 Sentinel ... 10/0 + 2/2 SKYLEADA KITS Jetex 100 O u tfit . 22/5 + 5 /0 Free Flight Power Hi Climber ... 25/0 + 5/6 G lid e rs Jetex 200 O u tfit . 3 1 .'8 + 7/1 Slicker Mite 9 /6 + 2/1 Midge 2d. Jetex 350 O u tfit 4 3/2 + 9 /7 2/4 Free Flight Power 1/3 - Southerner Mite ... 10 6 + W izard 3/0 8d. Fuels and Spares in stock. Pirate ...... 12/0 + 2 /8 S t r e a k e r ...... I»/» + 4/4 Kits for Jetex Sky Skooter 25/0 + 5/6 Three Footer 5 /0 - 1/0 Slicker 42' 17 6 + 3 /1 ! Fouga Cyclone 4 /4 + 1/0 Slicker 50* 25/0 + 5 /6 C a r d in a l...... 14/4 + 3 /2 Flying Scale Sea H a w k ...... 5 /4 + 1/2 Junior Scrios Slicker 60' 35 /0 + 7 /9 Control Line Power 1/8 Thunderjet ... 5/6 + 1/2 S outherner 4 0/0 + 8/11 16-inch Series 2/0 K.K. Cub 2/4 + 7d. See Bug 1 1 / 6 + 2 /6 Auster 2 6 ' Junior 60 4 0/0 + 8/11 Midget Mustang . 21/0 + 4/8 3/0 Flying Saucer . 2/4 + 7d. Grasshopper 3 /0 Bandit ...... 18/6 + 4 /2 Sea F u r y ...... 2 2/6 + 5 /0 Vampire 50 .. 5 /4 + j/ 3 Tiger Moth 3 /0 8d. O utlaw 22/6 + 5 /0 W yvern ...... 23/4 + 5 /2 Vam pire 100 ... 8 /8 + l / l I L a d y b ir d ...... 18/6 + 4/2 Philibuster .. 23/6 + 5/2 Control Line Power Flying Wing ... 5/6+ 1/3 Falcon R.C- ... 107/6 + 23/11 Spitfire ...... 2 7/6 + 6/1 A uster ...... 7 /4 + 1/6 MoteorSO ... 7/4 + 1/8 Flying Scale Power Panther ...... 2 5/0 + 5/6 Curtiss Hawk 15/4 + 3 /6 Jettlcopter 50 ... 5 /0 + l / l Piper Supei Cruiser 18/6 + 4 /2 G o s h a w k ...... 79/4 + 17/8 Thunderbird . . 14/0 + 3 /6 Jetticopter 100 8 /8 + l / l I Cessna 170 18 6 + 4 /2 Focke Wulf ... l»/6 + 4/6 Flying Wing ... 14/0 + 3 /6 Attacker ... 5,4 -- 1/2 Luscombe ...... 18 6 + 4 /2 Minibutter ... 15/0 + 3/4 C om et ... 11 '6 + nil Sabre ...... 5 /4 + 1/2 K.K. Sabre 3/0 + 8d. Control Line Models Orders over £\ Post Free in G.B.. minimum postage and packing charge — 9d. K.K. M I G. 15 ... 3 /0 + 8d Phantom Mite 11/4 + 2 /7 Delta Wing 5/9 -a. 1/3 Phantom ...... 18/6 + 4/2 TO RETAIL MODEL SHOPS ABROAD Zyra Space Ship ... 5 /9 ·· 1/3 Scout ...... 22/6 5/0 Radio Control Ranger 10/6 +■ 2/4 I AM NOW OPEN TO ACT AS YOUR OVERSEAS BUYER. E.D. M k. I complete £17/19/9 Stuntmastcr 19/6 + 4/4 Please write fo r fu ll particulars. E.D. M k. I ll £9/17/11 Skystreak 26 9/4 -t- 2/1 E.C.C. com pleto £13/4/1 2/4 Skystreak 40 10 6 + Hivac XFGI Valve 17/4 + 3/10 4/2 Stunt King 18 4 + Balsa. Obechi, Spruce Sheet Stunt Queen 21/0 + 4/8 and Strip at advertised prices. MERCURY MODELS A R I H U R MUIIIII Fuels Mercury. E.D., Mills, R.M., G lid e rs Shell. Rev. Magpie ... %.. 4 /0 + lid . Gil· Chopper 12/3 + 2/9 16 MEETING HOUSE LANE Dopes and Cement Cellon, Norseman 20/3 4 /6 Titanine. S.J.A., O ’ My, B ritfix . all M artin ...... 4 /9 + 1/6 B R IG H TO N - SUSSEX-ENG sizes.

Uitully mention AE/IOMODELLER when replying to advertisers January, 1952 Aeromodeller

ESTABLISHED 1935

VOLUME XVII NUMBER 1 9 2 JANUARY 1952

“ Coven the World m s u i ffi i s n ii of AeromodelUtig " S our older readers will know, we have always made it a policy of \ this magazine to periodically conduct a form of Gallup Foil as the Managing Editor: means oi obtaining direct information from our readers as to their .A.RUSSELL. Μ . · . M « c h E . current likes and dislikes, both in the fare we produce each month, and Editor : in connection with the particular class of model they arc directly S Η B R Ο Ο K E interested in. In the early days of the magazine it was a fairly easy matter for us Aaslttant Editor : personally to contact the majority of readers who influenced modelling H.G. HUNDLEBY opinion, but with the rapid growth of our Circulation and Model Public Rotationt O ffic e r : Movement in general, it is very obvious that a large body of opinion D.J.LAIDLAW DICKSON can only be contacted through our columns and the medium of correspondence. Publithcd monthly on the 15th o f the previous month by the Proprietors : It is some time since we conducted our last poll of " reader opinion THE MODEL AERONAUTICAL and this issue contains a specially printed sheet containing a series of PRESS LTD. vital questions on which we solicit the co-operation of our readers, Allen House, Newark· Street, Leicester. enabling us to prepare and formulate editorial policy for the immediate Subscription rate 21/- per annum prepaid future—which we feel will be to our mutual advantage. We would (including Christmas Double Number). stress that this sheet has been prepared in such a way that its removal from the magazine will in no way detract from the issue. Headers will note that, in the main, questions are grouped into two distinct sections ; the first of these being in connection with our regular Contents features and model design preferences ; the replies to these will enable SPECIAL FEATURES Page us to compile pome very valuable statistics for future reference. Trends ·· H A W K E R H A R T " . . 12 in modern acromodelling have changed so rapidly in recent years - VERONICA " ...... (and even months) that it is only too easy for presentation to lag behind " EN VO Y " ...... current tendencies. " DUO-MONOPLANE " We have done our best to present the questions in such forms that BEDBORNE MODELLING they can be easily answered, this applying particularly to the series on R /C SPLIT RUDDER model design and types. We arc only too well aware of the fact that JUST FOR FUN the vast majority of our readers arc non-contest minded, and prefer to CONTROL LINE DECK LANDING fly for fun. At the same time, we do not lose sight of the fact that it is WHY NOT A CHUCK GLIDER » through the keen contest-minded minority that the most rapid progress INFALLIBLE G LIDER ...... and development of any specific type of model is brought al>out. and RUBBER MOTORS ...... their activities are followed with keen interest by the large number THE F.A.I. REPORT ...... who do not enter a contest from one year s end to another. REGULAR FEATURES In addition to questions of a purely magazine nature, we solicit HANGAR DOORS ...... readers’ answers to a number of more ” personal "questions. Although IT’S DESIGNED FOR YOU—JETEX on the face of it some of these may appear irrelevant, we nevertheless M O DEL NEW S ... ask for their attention to the correct answering of these points, for we ENGINE ANALYSIS— D .C . 350 M K. anticipate being able to place a comprehensive dossier before our A N D 35 (G ) advertisers and other interested groups, this being- to the best of our GADGET REVIEW knowledge—the first time such statistics relative to the Acromodelling W O R L D N E W S ...... Movement have been secured. READERS’ LETTERS ...... YO UR M ODEL S H O P ...... In the past, polls have been well received by our readers, and the RADIO CONTROL NOTES ...... percentage of replies has l»een of great service to us, and in turn, our AIRCRAFT DESCRIBED — HAWKER readers. Wc ask for their full co-operation in completing the question­ W O O D C O C K ...... naire and returning it to our offices at Allen House. Newrarkc Street. C LU B NEW S ...... Leicester, at their very earliest convenience. By so doing, they will be helping both us and themselves in maintaining the standards of the Advertisement Office : magazine—a standard we aim to improve on each and every occasion. THE AERODROME. BILLINGTON ROAD. STANBRIDGE. NR. LEIGHTON BUZZARD BEDFORDSHIRE. Tel. : EATON BRAY 246 Editorial Off.ce : Qover °Picture .... ALLEN HOUSE. N EW AR KE STREET. LEICESTER. T e l.: LEICESTER 65322 C harles G a rd n e r, II.H.C. air correspondent, ic/ io opened a recent exhibition organised bp the Epson ι «1- District Model Flying flub, examines one of the muny flying models built by I I . Shepherd who is on the left in the picture. The m o d e l, which is Mills VUΊ c.c.c powered a μ pci ι rs to be based on tf ticipating in this most successful show. Aero modeller 10 January, 1Q52

completed without acrimony, and the majority of dis­ cussion was constructive and forthright — a distinct and pleasant change from some earlier functions of a like nature. With the Chairman. Mr. A. F. Houlberg, and the Hon. General Secretary, Mr. D. A. Gordon, returned to office unopposed, the only positions put to the ballot were those for Vice-chairman­ ship and Public Relations Officer. Messrs. R. F. L. Gosling and K. R. Brookos were returned to office with big majorities, thus bringing about no change in duties for the new season. We doubt the advisability A Η«·(*ί Good ‘ D o’ or even the constitutional correctness—of having The 1951 Annual Dinner and Prizegiving of the " Any Other Business ” on the Agenda for an A.G.M., S.M.A.E. took place at the " Horseshoe Hotel " on the for this portion of the meeting took some three 17th November, and in our opinion was the best hours 1 We would prefer to sec the ordinary business post-war effort to date, reflecting great credit on those meeting closed, followed by a general discussion responsible for the organisation of this important and exchange of opinions amongst those who can social function. rarely meet others in far distant parts of the country, rather than have official decisions taken on the Air Commodore Whitney Straight was the principal proposition of individuals before such matters have -guest, and made a concise and encouraging speech been taken back to clubs or areas for wider con­ during which he emphasised his appreciation of the sideration. This method would in no way handicap imjwrtance and benefits of aeromodelling. confirming those interested enough to attend an A.G.M., but it opinions published in the Report bearing his name. would prevent items being put through by a proposer He further expressed surprise at the imposing array being able to persuade a relatively small gathering, a of trophies displayed, later distributing the silverware practice that invariably results in second thoughts and to the successful titers during the 1951 season. rescindments when the matter has received more After-dinner activities were lively in the extreme, general consideration. including a cabaret which introduced Miss Joy O'Neil, the now (in)famous West Essex Singing Waiters, I 11 a Autsliell! and--surprise item of the evening—-an ” Arthur Wc arc indebted to a reader for the following English ” act by Phil Guilmant. who admitted he had quotation, which would put a tightly fitting cap on left his “ barrer " outside, from which he was conduct­ many aeromodcllcrs of our acquaintance ! ing a flourishing business by '* flogging Fairlop filched Frog 500's “ I hate the guys who criticise There was a wide representation from many parts of and minimise the country, and the demand for tickets created a sell-out. Early application for the 1952 function will the other guys, be necessary following the success of the last affair. whose enterprise has made them rise Delayed Action above the guys Mr. D. A. Gordon, Honorary General Secretary of the who criticise Γ* S.M.A.E. for the past four years, was awarded a Fellowship of the Society on a unanimous vote at the How now. Drown Cow ? Annual General Meeting which took place the day We learn that a well-known Surrey model club has following the Dinner. Readers will remember that the arranged to move its flying field as proximity to local Council’s recommendation was vetoed at the 1950 cows was affecting their milk yield. What is this puny A.G.M., but the absence of disruptive elements at the race of modern cow that is daunted by control-line 1951 function was very welcome. flying, where is the breed of bovine Churchills that braved the Battle of Britain and never faltered in their We extend our congratulations to Mr. Gordon on gallonagc ? Wc fear that the modern cow is not what tiis award, and ςουρίβ our appreciation of his good work she used to be ; Daisy and Buttercup must now be over the past few very difficult years. milked by machinery in. white-tiled magnificence, lulled by soothing “ music while you jerk ", no bebop And Peace lleigned thank you ! not casually by a camping modeller into For the first time in years we are pleased to be able an old fuel can ? But wc find it difficult to reconcile to report an orderly—albeit poorly attended—S.M.A.E. this seeming lack of stamina with the prodigious annual general meeting. Those in attendance were appetite that has only so recently manifested itself obviously keen on getting the business of the Society upon a staff R /C model. Our Bedfordshire milker wc January, ig$2 Aeromodeller are happy to say suffered no ill cflects from the con­ Acromotlellcr Aiinual I!).» I sumption of a complete tail unit and fin, and only That hardy annual is here again ! Your model shop baulked at the aluminium finish of the mainplane. or bookseller should for a few days at any rate- -be Our bulls, too, we can honestly say are full of . . . but bright with the gay jackets of ’ Aeromodeller Annual ” perhaps we had better leave it at that. 1951, now making its bow for the fourth year. Wiser It.A.F. Cliampi«»n*lii|>* at aeromodellcrs will already have placed their orders, or ensured that a copy is high on their present priority list, Contrary to our usual custom we grouped author others are urged to secure that casual copy without and photographer together as a team in our report of delay, or if their local shops have cleared out the the above meeting in a recent Aeromodeller. Bill initial supply, see that your copy is not forgotten in the Dean asks us to give him credit for the pictures : while “ repeat . Last year many home readers were dis­ Vic Smeed is of course the author. appointed in view of unexpectedly large—though welcome—export demands: this year again the Aeromodflling^M I.on* Dominions and America will be taking a good share, We learn with deep personal regret of the sudden so be advised, we cannot reprint, get your copy death on the 14th November, 1951, of J. W. (Joe) right away! Kenworthy, winner of the Wakefield Trophy in 1933, and one of the best model builders this country has If you have never seen an " Aeromodeller Annual”, produced. Founder of the Northern Model Aircraft Co. go along and thumb over a copy—we know you will in Manchester, Joe was cursed with very poor health be thrilled. following gassing in the first World War, and had to leave the North of England some years ago to take up I'rire#» ami Profit* residence in the South. Here he acted for some years On page 40 of this issue will be found a letter by a as Southern Counties representative for Model Aircraft Mr. Nctherclift first published in our contemporary (Bournemouth) Ltd., manufacturers of the” Veron” kits. " Model Aircraft ", which we have reprinted by their His many North country friends will remember his kind permission, together with a reply from Mr. helpful instruction to all acromodellers, and his pains­ Paterson of Plantation Wood (Fencing) Ltd. The taking attention to detail that made any Kenworthy subject under discussion, ” I*rices and Profits ”, is of model a masterpiece. Your Editor owes a great deal to considerable importance to the whole of the Aero- Joe's expert guidance, for it was mainly tlirough his modclling Movement and we ourselves feel that tuition—and candid criticism—that he was able to thorough ventilation of the subject will do much to engender the keen interest in model aviation that prevent such misinformed opinions as those expressed eventually led to his position on the staff of this by Mr. Nctherclift. magazine. In case any budding financiers amongst our readers With the passing o f" J. W. K.” British acroinodelling should still raise eyebrows at the apparent “ Alice in loses one of its best types, and an early enthusiast who Wonderland ” trading so aptly described by Mr. did so much to start the hobby on its present course. Paterson, we would point out that not only is balsa wood (and even for that fact the Aeromodeller itself) Index for 1051 exported at a virtual loss, but that many of our best Those farscctng readers who m .a k e a point of saving dollar earners, including the vast car export business their A e k o m o d k i . l k r s will b e glad to know that arc necessarily conducted in the same manner to obtain Indices for 1951 are now ready, and will b e sent free those vital dollars. of charge to those sending 2Jd. stamped and addressed Mr. Nctherclift must take comfort from the fact envelope to our Leighton Buzzard Offices. that in this way he is sharing a very necessary burden For those who have managed to save their copies from with every other inhabitant of these isles. the ravages of their friends, binding is the only way to ensure their future perman­ ence. Our covers are finished in gold foil lettering on a neat red cloth and will enhance the appearance of any bookshelf. Copies for binding should be sent securely packed together with remittance for 10 /0. which includes cost of return postage. Delivery is usually made in about 10/14 days after receipt. In the case of recent volumes an Index is automatically inserted.

( i'm m I of honour nt the Ν.Μ.Λ.Κ. Prixeglrlny tUnnor, Air Commo­ dore Whitnep Straight, C.II.U., Λ/ . C . , D .F .C a u t h o r o f th e W h it- m m Htmtght Report on p r toato fll/intl· proporen the toa*t to the Society. Soto the imposing arrau of prixtm. Aeromodeller 12 January, 1952

WALTER MUSCIANO’S TO I' SCALE HAWKER HART

Control-line Biplane fans will like this stunter which will take from 2*5 to 5 c.c.

ΠΤΗ slight deviations from true scale toenhance are added by sliding the outer panel spar stub its stunting abilities, this " Hawker Hart ” through the centre section ribs and cementing it by American designer Walter A. Musciano is a to the centre section spar. Centre panel ribs arc well model that will win top points both for stunting cemented to the leading edge. Add the leading- and appearance. edge surface covering and solid wing tips to With the current trend toward the scale model, complete the structure. this colourful subject should be a |x»pular choice AsM'inbl.v. Cut the wing struts from pine or for all scale-stunt fliers. other hardwood and sand to a streamline cross section. When cutting the struts to length make I iisrlage. Cut the sides from hard £ in. sheet certain they arc at least $ in. longer at each end. and join at rear while installing the 3/32 in. bulk­ This is necessary because they must be eniliedded heads. Now cement the engine mounts and formers into the wing ribs and fuselage side during the in place. The landing gear is then bent to shape and assembling. It is suggested that at least the lower the joints soldered before installation. Hind the surface of the upper wing centre section and the landing gear to the two £ in. plywood supports top of the fuselage forward of the cockpits be with strong thread and cement well. Then painted before assembly. Cut into the fuselage cement to the fuselage. Fit the fuel tank. When side for the lower wing spar stub and cement the installing the tank be sure the feed line is on the lower panels in place, to the correct dihedral and same level as the needle valve Ixnly on the engine incidence. Using a sharp tool, pierce holes into in order to ensure a continuous flow when flying the fuselage side and wing ribs where the struts inverted. Now the nose pieces can be carved and are to l>e inserted. Insert the struts into the hollowed. Cut away for the engine cylinder. fuselage and lower wing, using plenty of cement. Cement these blcx:ks in place. Attach the lead-out The upi>er wing is now added by inserting the struts wires to the bel 1-crank and install the latter into the holes previously provided. Cement well. sccuroly in the fuselage. Cut the tail surfaces from F in i*»l·. The model is coloured all silver with £ in. sheet and sand to a streamline cross section. black serial numbers and red, white and blue Hinge the elevator to the tailplanc and lx>lt the roundels. A very light sanding with finishing paper metal horn to the elevator. Cement the stabilizer should follow each coat after it is thoroughly dry. to the fuselage now. When dry. the control rod is The last coat can be rubbed briskly with a good bent to shape and connected. Add the fuselage grade of rubbing compound to obtain that bottom, using plenty of cement. The turtlcdcck " professional " look. strips and forward sheet covering are now added, followed by the landing gear fairings. F lying:. A point g in. behind the forward control wire is where the model should balance. Use IVing;*. Cut the ribs for the lower wings, and •012 in. dia. steel flying wire or heavier. Lines can slide onto the spar, attach the leading and trailing be from 30 to .50 feet long, the longer lines preferred edges and cement all joints well. Cover the leading tor stunting. Begin inside loops when flying surface with I /16 in. sheet and add the solid tip. downwind and outside loops into the wind. Figure Cut and sand to shape when dry. I>o not forget to eights, etc., are jierformed best with the wind on allow the spar to protrude as the plans indicate. your back. When flying inverted do not forget Begin the upper wing construction Oy assembling that your controls arc reversed, up is down and the leading edge (three pieces) to the correct down is up 1 dihedral and sweepback. While this dries, cut out The " Hart ” will go through the S.M.A.E. the ribs and slide on, and cement to the spar. Add Stunt schedule with the persuasion of a skilled the trailing edge. Assemble the centre section onto pilot, or be as docile as a trainer for any beginner. the leading edge and then the two outer panels Try one—you'll like it.

Aeromodeller January, 1952

BRITISH OPEN & A /2 RECORD HOLDER by MAURICE F. PETRIE

Sem U ry of Sutton Coldtirld M.A.C. . . aged 28 . . . . Export ealee manager with Tube Investments .... married, ha· one email daughter .... no time to «pare for other hobbit··, except an interest in model boat·.

ESIGNED as a " toughie" to stand up to T h e Wiiifir. The method of mounting the wing U British weather conditions, Veronica is as on the fuselage has been adopted as the most crash­ ladylike as her name ; but one of the roaming kind. proof arrangement which can be devised. The On her very first airing, with a trial tow on only holding down block is first cut to the rib contour 100 ft. of line, she decided to wander from the flying of the wing. It is then fitted carefully to cut away field and was finally recovered six miles away. portion of the fuselage and lightly cemented into After a repeat of that same performance on the position without the wing in place. It is then second test, Maurice Petrie decided it was high shaped to the exterior contour of the fuselage. If time to temper the roving instincts of his nomadic desired, the faces of the block butting onto the model, and fitted a tip-up tail dethennaliser. fuselage itself may be faced with thin celluloid, as Then club-mate H. L. G. Campbell-Kelly tried a also the corresponding faces on the fuselage. On duplicate version for hand-launched slope soaring, the original model the block was securely cemented and after a steady run of two to three minute in position, but subsequent models have shown flights, established the new British record for that the mounting is more resilient to shock if it H/L Open and A/2 on July 29th, 1951, with a is not attached, and the wing is held quite securely super flight lasting 24 minutes, 30 seconds. With by a separate block provided it is well fitted. its hollow-log type of fuselage, carved from block T h e T a il μ la in- a n d F in . Again the con­ balsa, this tough soarer is one of the kind that last struction is fairly straightforward, and needs no until lost. comment. It should be built as lightly as possible CONSTRUCTION although the leading edge should be sturdy. Diagonal ribs are completely warp resistant and T h e Fu*«*l afire. Two blocks of soft balsa no more difficult to assomblc. 4 x 1 x 30 ins. are cemented together lightly enough to enable the composite block to be carved to the Full-size copies of the J scale reproduction outline in one piece. The two halves are then opjxjsite, may be obtained, price 4/0 post free from carefully separated and hollowed out with small the Aeromodeller Plans Service. gouges as shown, to a $ in. wall thickness. Halves can now be cemented firmly together, fitting into their appropriate positions, the 1/16 in. ply keel former, and the ft in. balsa sheet fin. The designer’s original model was left natural colour and french polished. In this way it was found possible to keep the weight of the fuselage lower than by numerous coats of dope.

Ixmg flat centra section, foriturd fin and aquare tips a rc fr a here» o f th l· record-holding A/2. t'pper photo of clean - a harm Maurice la * an - internal * . . . th e h e a rd i com at right cor era a Chteken-por rash. VERONICA

- - - a 1 "··;'·

- :■ ■ s l·...... H?

- I J__ ■IT T -, r- f/, ~ =- Aeromodeller 16 J a n u a r y , 1 9 5 2

|1YRIL Shaw's Envoy is not new. It first the flying speed is fast, but because of the inherent Vi appeared as a kit early in 1950, and a number stability, is also very safe. of these kits were circulated by Shaw's of Large enough to accommodate any of the latest Norbury, London. Now, Cyril has emigrated to 1-5 diesels, and yet still not too large for the -5 c.c. Canada and the kit is no longer in production. Dart, we know that the Envoy will continue to be So attractive arc the lines of this high wing one of the most jxipular sport designs in the tricycle design that we feel the demand for full country. full size plans should not be neglected. All the printed parts, formers and ribs are now shown full Construction size on the drawing, and slight modifications here The fuselage is a simple box construction of and there have enabled us to present the Envoy in J x J in. and £ in. sheet balsa. Join the fuselage the popular A.P.S. scries. halves by formers 1, 2, .'1. and rear ply U /C former, First test flown over Epsom Downs in cold after the undercarriage has been sewn on to the windy weather, the prototype flew " straight off latter. Join fuselage at rear and complete basic the board *' with a steep power climb and im­ construction. Slip engine bearers through formers pressive glide. Using an E.D. flee diesel for power. 1 and 2, after pre-cementing. Mount motor and attach cowling blocks, which are then carved to shape, and finally sanded when the motor is removed. Now add formers 4-8, stringers, wing platform and dorsal fairing. The wing and tail construction is simple and needs no special instruction. Each wing-half is built on the plan, and when dry, the halves are joined by the dihedral brace so that there is 3} ins. dihedral under each tip. Cement the fin into the space between the tail- plane centre ribs after each part has been covered : . but before they have been doped. Use lightweight Modelspan, with at least two coats of clear and one coat of colour dope for decoration. Flying The Envoy flies perfectly without any thrust adjustment and has a natural climb to the left. Only the glide trim need be altered to tighten or open the radius of turn by adjustment of the rudder trim-tab.

Cyril Shatc'a flair for de*tfiiilri(j model* trith distinct ■ effc-appeal " in tcell exemplified in the Knroy. irith it* neat cabin, cotried engine, dorsal fin and tricycle undercarriage.

U3 SCALE DIHEDRAL V FRONT VIEW TAILPLANE 3/4 WING III t" SPAN

FIN. (MAKE 2)

FRONT WING PANEL (MAKE 2)

1/16 SHEET WINGS FIN & TAILPLANE

REAR WING PANEL (MAKE DUO-MONOPLANE January, 1Q52 19 2Aero modeller

LANCING through the f pages of a recent American aviation magazine, we came Bill Dean across an interesting article on Duo-Monoplanes—those presents .. unusual aircraft that are something like a DcBolt Bipe. AN INEXPENSIVE minus the tailplanc ! We had ALL-SHEET NOVELTY never seen a model based on the Dual-Mono layout, so the FOR JETEX 50 decision was made to build a Jctex 50 powered version and see if they really worked. All­ sheet construction was chosen for simplicity and the Jetex unit was shifted along the fuselage until the glide had been perfected. No alterations to the incidence settings were necessary and the model per­ formed just as well as other more conventional designs that we had previously built. We were pleased to find that if the model happened to be climbing vertically when the charge expired, the stall re­ covery was remarkably good. Building time should not be more than two hours, so you need only set aside a short evening for this 15-in. span Jetex model. C oiiK triictioii The plans on the adjoining page are given full size, so the patterns may be transferred directly on to the balsa sheet by means Monoplane of carbon paper. Choose light, strong 1/16 in. sheet for the flying surfaces and medium £ in. for Keeping the weight down is all important with the fuselage. Taper the leading and trailing edges a Jetex-powered model, so any decoration should of the wings (on top) and join the panels at the l>e applied sparingly. The cabin (see plan) may indicated dihedral angles—pinning the left hand be filled in with black dope, but on no account panels flat on the building board and cementing colour dope the entire fuselage. All-up weight the right ones to them (propping up the latter with should not be more than one ounce. books). Notch the fins on to the rear wing and check that they are quite vertical. T riiin n in c r Check the model to make certain Next cut the fuselage pieces from £ in. sheet and that there are no warps, then clip in the loaded join them flat on the plan. When dry, lift up and Jetex motor, launched on a gentle downward cement the 3/16 in. square hardwood motor mount path, the model should touch down some twenty in the notch provided. Carve away the front and feet away. Any suspicion of a stall must be upper comers of the motor mount so that it fairs trimmed out by adding weight to the nose or by into the fuselage. Hound off the edges of the twisting slight positive incidence into the rear wing fuselage* except at the wing positions. Screw the panels. Make the model turn in cither direction Jetex clip in position, making sure that it is lined by warping the fins. Avoid flying over damp grass up centrally. Attach the wings in the upper and as these all-sheet models are prone to warping lower notches, building up cement fairings on under these conditions—and this makes trimming either side. Before the cement lias had time to extremely difficult. set, see that the wings are aligned correctly in the Once the model is gliding well, light the fuse and top and front views. Give the entire model a coat as the thrust develops, launch at about the same of banana oil, then check that the model tialauccs speed as is usual with a rubber model. To get at the point indicated (1 in. behind the L.E. of maximum height, the model must be trimmed the front wing). A few drawing pins may be added into circling flight. Finally, put your name and to the nose to correct tail heaviness but if nose address on the fuselage, as these little jobs heavy'·, move the Jetex clip further back. frequently fly out of sight—even in the winter time. Aeromodeller 20 January, 1952

I t Ε Ι» H O l i f t * ] ΊΟΙΜΙ

ENCOURAGEMENT^ FOR HOSPITALISED MODELLERS Acromodelling

Occupational Therapy by R. A. WARD

A t le ft ; The author mdmtrea three of the control-line models he trill be able to test tchen fully recovered, and jterhaps he is reflection on his very active life before entering the sanatorium, shown in tint right-hand photo, tchere he is manhandling a competition Itanium at a l» ***t Country trial. RY to imagine what your feelings would be if ground for small chuck-gliders were immediately T you were suddenly told, as I was, that you apparent. 1 prevailed upon my wife to bring with were seriously ill and that you would have to spend her on her next visit a supply of balsa wood and the next nine or twelve months in bed, in a cement and commenced manufacture. By keeping sanatorium. You would probably react in exactly the size of the gliders down to 8 ins. span, many the same way as I did, by being plunged into the hours of flying were enjoyed by myself and several deepest gloom. I had led a particularly active life, other patients who became interested in my and I reflected bitterly: no more modelling, activities. There were numerous reasons for being football and motor cycling, for a year, anyhow. out of bed at different times of the day. and, by 1 low wrong I was I soon learned. I have now spent pure coincidence, of course, flying occurred at these nine months in bed, to date, and I expect to lx; times. on my feet once more within the next few weeks. However, I was not satisfied with chuck-gliders Reposing on the top of the ward-cupboard at the for long, and my wife soon found that she had not side of my bed, and hung on the walls, are five rid herself of the aura of aeromodelling, for at each control-line models, one powered free-flight model weekly visit, she was asked to supply dope, tissue, and many chuck gliders, all built within the last rubber, balsa and cement for her crazy husband, nine months whilst I was lying, in bed. I sincerely who had now decided to try to build rubber- hope none of you ever share my experience, but powered models while lying in bed. In this I was if by any chance you do, perhaps the following story helped by the more advanced patients, who were will lighten your hearts and make your hos­ allowed out of the building for walking and light pitalization (dreadful word! more cheerful. exercise. As soon as a model was finished it was I quickly settled down to hospital routine, and roughly trimmed in the ward and then taken immediately noticed that occupational therapy outside to the lawns to be flown. The accident played a very prominent part in the treatment of rate was quite high to begin with, as none of the my particular ailment—T.B. Fortunately, tuber­ up-patients had flown a model before and they had culosis in its milder forms docs not seriously to rely on my shouted instructions from the window' incapacitate the patient, and lying in bed, while of the w’ard. Nevertheless, plenty of amusement feeling perfectly fit and well, can lx; very irksome was provided by these budding Wakefield flyers. and wearying. And so most of the patients, during A hint to anyone follow-ing my example will not be their allotted working hours, were busy painting, out of place here ; don’t try to beat any British weaving, embroidering and making leathcrwork. records with your models. Be content with short- 1 was not particularly interested in any of these duration sport-flying. Hospital authorities do not pursuits, and being a rabid, almost fanatical take kindly to patients on light exercise tramping aeromodeller, began debating whether 1 could miles across the countryside after flyaway models ! possibly carry on modelling within the confines of a Logically, of course, the next step was powered hospital ward. flying. However, with this I could visualize a few The ward itself was a great bam-like room witli obstacles. Soldering, drilling and sawing are a very lofty ceiling and its possibilities as a flying inseparable from powered modelling : I decided January, 1952 21 Aaomodeller

luck) of the two beginners, when they found that, at the end of the afternoon’s flying, they could both make a reasonably good flight, and that, more important, the Phantom was still in one piece ! Returning to my experience, I quickly designed the Yale and commenced building. I had, by now, obtained almost all my modelling materials and tools from home, including a small twist drill and an electric soldering iron. My hobby attracted everyone's attention, including doctors and nurses, and the progress of the model was a daily topic of conversation throughout the sanatorium. It was eventually finished and, at the moment, is occu­ pying pride of place in a disabled men’s exhibition of work at the local Red Cross and British Legion Headquarters. I found that as I was in no hurry to finish the model, I had not skimped any detail. Now I have all my engines with me and have built one, and in some cases, two models for each motor. Apart from the Panther and a Ladybird free-flight model, all of them have been designed Doctors and nurses noon became Interested in on a drawing board measuring 27 x 19 ins. and M r. Ward's ucroimHtclUng. This lannle appears to Itacc been tcell instructed on tune and ic h e re built, down to the smallest part, whilst lying in bed. to h o ld a model correctly .’ I am now anxiously awaiting the happy day when that I would do well to go cautiously at first. To I can get out of bed and commence flying my stable that end, I started with a good prc-fabricated kit, of hospital-built models. the Vcron Panther. I had chosen control-line In conclusion, if any reader finding himself under flying for the simple reason that the grounds of the the same circumstances as myself, desires to hospital were dotted here and there with clumps continue modelling during the time he is in bed, the of trees, which would have proved disastrous to following hints may prove useful:—Do not attempt freeflight models. to carry out any work without first obtaining the The Panther kit proved ideal for its purpose permission of the medical supervisors. Do not and was quickly finished, but my ambitions were break any hospital rules while working or flying. still not realized. In my sparc(?) time I was You will find there are plenty. Try to keep dope painting and sketching and had been provided with and cement off the sheets if you wish to remain a drawing l>oard and tee-square. I decided, popular with Matron. Please do not test-run therefore, to design and attempt to build a scale engines in the wards until you are sure no-one else sports model I had long had in mind—the North is inconvenienced. Kitted models are more American Yale. suitable for building in bed, but if you think it can In the meantime, two of the up-patients had be done, by all means try designing and building been badly' bitten by the modelling bug and had your own. invested in a Keil Kraft Phantom and an Elfin Finally, any reader who does undergo my 1-49 c.c. engine. It was a great moment when the experience has my deepest sympathy and I wish model was finished and the two proud builders, him all the luck in the world. He will find that he neither of whom liad ever seen a control-line model can make his stay in hospital shorter and infinitely in flight before, sallied out on to the lawns to more happy and interesting by carrying on with commence flying. Once again, shouted instructions * our grand hobby. from the window were neces­ sary before the engine was started. When that happened they were well and truly on their own, for 1 could not hope to make myself heard above the whine of the Elfin at full revs. It speaks well for the Phantom and the skill (or

The realism of thin Sorth Am eri­ can Yale Hitcakn i cell for Mr. Ward’s patience. Unlit to one- hrelfth acale. It han an American Fortier 20 motor. J a n u a r y , 7352 Aeromodeller 22

It’s C>rt »LIOMl IA»fB ON Itasig'iiecl fo r YOU!

NUMBER SIXTEEN J l l l i X

n o m in a l c « ΪΕΤΕΧ is a most interesting form of power SUSTAINCO J unit, available as it is in four distinct — THRUST " motor ” sizes suitable for powering models of between 12 «and 45 ins. span. The Jctex motor has the singular advantage of being a completely self-contained power unit which is located by a simple clip. A single motor, in other words, can bo used in a number of different models. Servicing is reduced to a TIME OF BURNING minimum, since about the only attention the Jctcx needs is a regular cleaning and occasional replacement of the sealing washers and gauzes. There are no moving parts, and hence there is no wear. The power unit, too, is virtually indestructible. Thrust is produced directly by the ex­ panding gases of the burning charge and is almost a pure straight thrust, as well as being appreciably constant over the bulk of the power run. There is no torque as there would be with thrust developed by a propeller, whilst the actual power output is charac­ terised by the graph in Fig. I. It will be noticed from this that the thrust builds up slowly at first after the charge is WING AR6A ( SO ignited, reaching a peak value in a reasonably short time. It remains roughly at this peak value until the end of the burning time, when it tapers off. Although all the charges arc prepared to the same close specification there is, in practice, some variation in the actual thrust output from individual charges in the same motor. Thrust output may also be modified by such physical conditions as the cleanliness of the jet hole in the motor, the state of the interior gauze, and so on. All things considered, however, it is reason­ able to assume that the power output of the motor will remain substantially the same, flight by flight, without adjustment. The number of the Jetex motor is actually a designation of the thrust output it is intended to give. Thus the Jctcx “ 50 " gives a thrust of approximately 0-5 ounces ; January, rg$2 23 Aeromodeller a Jetex " 100 ” 1-0 ounces, and so on. These figures are a useful guide in the proportion­ ing of suitable models for maximum per­ formance. The leading physical charac­ teristics of the various sizes of Jetex units are summarized in Table I. The Jetcx-powered model designed for duration work is in a similar category to the power duration model. Power run is limited, in this case by the time of burning of the charge, and so the main object of design is to produce a model which will have a good flight ratio (total duration : duration of power run), which means in effect, a fast climb to a good height, followed by the best possible glide at minimum sinking speed. In this respect the Jetex motor is very well suited to duration work, for the weight of the complete motor is less than the sustained thrust it is capable of developing. It is not in the same category as some internal com­ bustion engines, however, where the thrust dcveloj)ed is so high, for the size and weight of the motor, that it is ]>ossible to produce a Inlng a ** 350 " unit. IUII llemlernoii (.V. Kent) iron the 'St S.M.A.E. Jetex Content irith the mint el nhoirn hi the upper complete model with a total weight less than photo. The irtng in mipporteit by a rotililerer mtructure. the thrust developed by the motor. Such a Innrer photo shows hit < arson's neint-nmle p o d a m t b o o m itenlgn, irith completely roulrtl Jetex unit. I’art of the jw

T A B L E 1. It would appear an almost ideal layout for Hying wings, for example. If we arc primarily concerned N o m in a l O v e r a l l O v e r a l l j E m p ty W e i g h t o l J«UX T h r u i t L e n g th D ia m e te r ; W e i g h t C h a r g e with duration, however, we arc more concerned (0 *».) (in * .) (In * .) ( o n . ) (OI*.) with finding the most efficient, or what is apparently the best layout. SO 0*5 If 21/64 j 1 t too 1 0 21 1 Both high and low thrust-line positions have been used successfully, and as a matter of fact the 200 2 0 2 - 13/16 1- 9/64 I 1* 5/ 16· I.C.I. Challenge Trophy has been won by each. 3S0 3 5 31 1- 25/64 j 21 13/ 32· After trying both, Dick Twomey prefers the * Single charge. high thrust-line layout, believing that such a model has less tendency to loop under high power, and T A B L E II. docs not waste power in down-thrust. A typical MODEL SPECIFICATIONS high thrust-line layout may in fact be rigged (taking the tailplane as the datum line) with wings at

Jetex W in j Area C hord Span Total W eight + 3° and thrust at -f 3° also, so making the most of (*<*. m*.) (in *.) (m *.) (ox*.) its available power. 50 50 3 18 However, both layouts have their supporters and 100 100-120 4 30 neither can be condemned. A happy medium may 1 I - U well be that used on the 44 Durajet" and Bill 200 140-160 4 | 34 2-3 Henderson's models where the thrust-line just 350 180-240 5 · 40 about coincides with the line of drag, see Fig. 3. 1 “ All these points are inseparable from considerations • Average chord on taper wing». of wing mounting, and lightness and simplicity may again prove the decisive factors. Model specifications for the various Jetex units Recommended practice is normally to fly Jetex are summarized in Table II. It is usual to work to models straight or nearly straight under power. empty weights for design purposes since we are Dick Twomey advises :— mainly concerned with weight as affecting glide 44 Granted a tight spiral climb is a good thing ; performance, and on the glide the charge has been but the ideal is a straight climb and a circling glide, consumed. ^ which can be achieved with a little juggling and a modicum of patience. With very high power (it Thrust-line ami trim will be shown how Jetex power can be increased) As to the layout of the design, here the Jetex nothing but this trim will stave off disaster. power unit opens up a range of possibilities. Being such a compact power unit it will fit almost any­ First mount the jet unit with built-in side-thrust. where into a conventional or unorthodoxToutline. This is quite effective, since our unit has already been mounted ahead of the model's C.G. However, since this distance is not great, one or two degrees of sidethrust would have little effect. On my models 10° has been found to be the best setting (Fig. 4). Rudder is balanced against side-thrust, and produces very satisfactory results. When the glide is a satisfactory circle, begin powered flights with small amounts of fuel, i.e., one charge halved. Increase to one full charge and so arrive gradually at full power. 44 350 " fuel is already gouged out at one end to ensure a good 44 change-over ", but on 44 200 44 pellets you must do this for yourself. It often hcljxs to insert a small coil of Jetex fuse in this "dug-out".. It is recommended that all adjoining faces of charges be scraped on the surface, and it is essential to press the charges hard down against each other." The principle of wing warping for turn is illus­ trated in Fig. 5. One wing is given wash-in and the other wash-out. On the glide, where the wing is operating at a high angle of attack the wing with greater incidence drags more and turns the model in that direction. Speed the model up, as under power, and this wing with greater incidence now tends to lift more and roll the model into a " .Vote boy ; '^Whittle, / hoi (eve him name in." turn in the opposite direction. January, 1932 25 Aeromodeller

A central thrust line Is favoured by the Surbiton Club, an .1. Hancock dem onstrates in this civic of his Jt entry at the l.C.l. Contest. At riyht : Peter Want and one of the Jctex “ 100 ” flyinfj boats tchich rouiul-the-pote over the tcater tank at the 1051 Model Engineer Exhibition. We can complete our summary of the basic should be possible to reduce the nose length to one layout requirements by reference to Fig. 6, which chord and still require little or no ballast to trim. summarises the main requirements of what should For competition performance the efficiency of be a good duration design. The Jctex motor itself the model design can be brought to the highest should be located with its centre of gravity slightly standard by improvements in the thrust obtained forward of the design C.G. of the completed model from the Jetex unit. Dick Twoiney offers his tips to add a slight stabilising nose-down or under- on this subject as follows :— elevated effect when loaded, i.e., under power. This will assist in promoting the acceleration into Increasing thrust fast climbing flight as the thrust builds up, for The power in a *' 200 " unit can be increased to in this flight attitude the wing angle of attack will about twice the thrust by the following method, have to decrease. not to be used without a great deal of caution. After this, the remainder of the design layout is When your model is well trimmed and climbing fairly non-critical. The one really important factor straight on normal " 200 ” fuel, try cutting down is the size and disposition of the fin or vertical the diameter of “ 350 ” pellets until they just fit tail surface(s), but this is just the one point on your “ 200 " unit. “ 350 " fuel is much more which no empirical rules can be given 1 A fin area concentrated, and performance is tremendously of around 7·5 per cent, of the wing area should be increased. Jet run will now be 10 to 15 seconds, more than adequate (up to 10 per cent, total fin depending on the closeness of the fit of the charges area on a twin-fin design) and would appear best inside the cylinder. The more the air gap between with at least two thirds of this area placed above the charges and the cylinder walls, the more the the tailplanc, assuming that the tailplane is power, and the shorter the “ engine run ”. This rouglily in line with the wings. method of fuelling may eventually cause the metal end cap to bum through, but it will last for many In the main it is best to design the wing and contests, and is ideal for ratio events, where the tailplane basically on structural considerations. actual engine run is timed. In the I.C.I. event, of Small wing chords should be avoided, as these will course, where jet run is measured on the makers' introduce inefficiency. Accepting a figure of assumed average figures, this charging system is 3 ins. as the minimum wing chord to be used, this not helpful, and orthodox burning should be immediately fixes the maximum aspect ratio of a retained. Jctex " 50 " wing as 6. Lower aspect ratios are There are ways and means of “ hotting up ” the not desirable in any case, and so 6 : 1 will serve as Jetex “ 350 ” also, but it will suffice to say that it a good minimum figure for all the other model can be done and leave the reader to sort out the sizes. Above an aspect ratio of about 8 : 1 the best and safest method for himself. A word of normal parallel wing chord ceases to be a good warning: modifications of this nature are very proposition, and if higher aspect ratios are to be satisfying when successful (the writer’s " 200 ” size used, tapered wings are called for. model produced ratios of 21 : 1 and 24 : 1 when thus The balance of the design data required can bo treated) but it needs a stable model and painstaking drawn from the heading illustration. Construction trimming. is normal lightweight practice, as exemplified by A final recommendation regarding trimming is current rubber model and glider practice. It is an to have positive fixing of all component parts, i.e., advantage as far as possible to reduce the nose wing, tailplanc, and jet mountings secure, and fin length as this will have a beneficial effect on and rudder attached preferably to the fuselage and stability during turning flight. This calls for light not to the tailplanc This is the only safe way to rear fuselage and tail unit construction, when it avoid undesirable changes of trim. Aeromodeller 26 January, 1952

SPLIT RUDDER For Radio Control

b y F. B. T H O M A S and E. D. CABLE

HE average R.C. model is over-ruddered under T power and under-ruddered on the glide. A little explanation of this statement is perhaps necessary for those with little experience of R.C. flying. When, a model is flying under power, a small deflection of the rudder produces a quick rate of turn because the speed of the slipstream past the tail is added to the airspeed of the model. by the trip-wire, against a light compression spring. If the small rudder deflection is held on, the model When the trip-line is pulled forward by the timer quickly gains excessive speed and loses height in arm, the wire is disengaged from the upper rudder, a spiralling dive. which is driven strongly downwards to the lower When the motor stops, or is cut off by a timer, portion. It may happen that the timer operates there is still the same small rudder deflection to when right or left rudder is being held on. The turn the model in gliding flight, and the slipstream inverted “ Y "-shaped tabs ensure that the is no longer present. The rudder is usually less upper and lower rudders engage correctly with effective, and has to be held on for many seconds one another. When the rudder is in the 44 up ” before a slow turn develops. (engine-on) state, it is held accurately in a neutral It occurred to the authors some time ago that position by the locating pin and looj>ed wire. the ideal method of overcoming all these snags When the rudder drops into the 44 down 44 (enginc- would be to increase the total rudder area the off, or glide) position, the locating pin is drawn out moment the motor stops. The soundness of this of the wire loop, leaving the rudder free. The wire idea cannot be denied ; but it took a long time to loop can be bent slightly to one side or the other solve a simple, light and foolproof method. to apply rudder bias, if necessary. The lower rudder is connected direct to the The device can be fitted to any single-fin model, actuator, and controls the model during the engine- and the weight increase is negligible. Some trial on phase of the flight. A timer is essential, and we and error experiments are necessary to discover use an " electric ” diesel type. When the timer the optimum rudder areas. As a rough guide, operates and cuts off the fuel supply to the motor, however, the lower rudder should be equal in area it also trips the upper rudder, which drops and to the entire area of the original single rudder on any engages the lower rudder. Thus at the moment given model. The upper rudder should be approxi­ the engine is stopped and for the remainder of the mately equal in area to the lower, though it may flight, the rudder area is doubled. be found necessary to make it even larger. Fishing Referring again to the diagram, it will be seen line should be used for the trip-line. A metal line that the upper rudder is held in the “ up ” position will interfere with the aerial. We have fitted the split rudder to our two-year- old 44 Rhdderbug ”, and the results have been extremely gratifying—almost spectacular. Under power an easy turn can be held on for 180° before any appreciable speed is picked up, or height lost. When tire motor cuts, the rate of turn on the glide is almost identical to the power-on turn. If rudder is held on for more than a 360° turn, some extra speed is picked up, and this can be 44 spilled-off " by alternate applications of right and left rudder, until the model has taken up its normal gliding angle and speed again. Gliding turns can be continued to within 10-15 feet of the ground.

Another ansirrr to atleuuale glide responae la Urtn ruddera out of the allpatroam. a* uaed on thla latest version of Eric Cable'a “ C al'· If 'M a h er ” . January, I

CONTEST CAPERS FROM DOWN-UNDER BY THAT GLOBE-TROTTING AUSTRALIAN Adrian Bryant RE English aeromodellers and Clubs too contest- minded ? Whilst waiting around in England recently prior to going on to the Wakefield in Finland, I had λ good look at some of your Clubs and contests. Every week there seemed to be at least two contests of the Area, Centralised or decentralised nature coming up ! This is alright for those of us who thrive on contest work, but what of the fellow who flies for fun ? Why not arrange a little fun for him. There arc many types of contest that you can run to fill in that odd weekend. Give the non­ competitive flier an airing, and have a lot of fun yourself. Back in Australia we call them “ fun contests ”, but for the most part they are pure nonsense ! ! The first of these is the Power Scramble, and for the life of me I cannot sec why this type of flying hasn’t caught on in England yet. When it does, A fte r iW n n fn f/ the (fucennland sailplane cham ­ it will be the biggest thing to hit free flight since pion* hip, Adrian donned footware and hitch­ the Zipper ! There is less luck, and more is left h ik e d h im tra y <1 round Aimlral/a before setting forth for Finland, irhcrc he proxy fine pal to the builder and flier than in any of the other Loncrfian'n Wakefield into lhth place. Cur­ free flight contests. r e n tly in London, A d ria n icrute. this article 1 rhllnt tcorklny a* an instructor at Janti Jarri. Rules for this type of contest are simple, and there is nothing to stop you from changing them the duck shooting season The idea is, as most to suit your own particular Club. The object is to people know, a New Zealand conception, and sec who can put up the highest total flying time in power scrambles have been included in the N.S.W. one hour; any type of power model can be used ; Championships on two occasions, proving to be and you are allowed one helper to help retrieve the most popular event. They are usually last the model. In no case is a duration of above event of the day, and anyone with a model enters. 2 minutes counted, there is no limit to the number Don't by-pass power scrambling—give it go ! of entrants, and the more the better. No special type of model has shown up yet, but the There must be one timekeeper for each com­ physical condition of the flier counts a lot. The petitor, and it is better that he does not know the small model is easier to run with than the 1 0 footer, entrant he is timing for. The Recorder has a sheet and there is less chance of it being hit in mid-air. of paper ruled into about 20 columns, and in these As there is no limit to the engine run, is a high are entered the competitors' flights. climbing model on a 10 second engine run better All competitors arrange themselves around a than a Frog 45 on a minute run ? Who is to say ? circle, or in some order picked by the judges, each Most power scrambles arc hand-launched these ” team ” consisting of the contestant, helper and days, but R.O.G. adds that little extra thrill for timekeeper. When the Recorder gives the signal, the crowd, providing there is a good take-off area it’s just fuel, flip, fly and retrieve—fuel, flip, fly and there are not too many competitors. Contest and retrieve until he gives the word to stop. You Committees will be doing the right thing to ii: dude start your model, send it up, you and your helper a scramble in their next Gala. run after it, grab it when it lands and tear back to Straight line racing can be fun, and a class for the starting point to repeat ;is before. Meanwhile this type is included in F.A.I. world records. your timer lias taken the watch to the Recorder, Races can be run with both power and rubber and is back ready for the next flight. models, and the old A-frame pusher is a great This goes on for one hour (or longer, but an hour model for this type of racing. Built all of wood, is quite long enough !). The first half hour is with twin high pitch props, and J-in. square terrific, but after that it slows down into a steady rubber, they really move. slaughter with prangs, mid-air crashes, aches, Don't dismiss all this as nonsense. If you think pains, sore feet, etc., all taking their toll. A your club is getting into a rut, try them out. de-thcrmaliser is a must. It's a real bind to have a Don't build special jobs, use just what you have plane up over the 2 minute mark. on hand. These contests are ** just for fun "— As one bod. put it—“ like the opening day of try them and sec if I'm not right. MODEL

6 NEWS

AUGHT alone in the den, and with the old "j round-the-polc rubber job just pleading for a spot of circulating, its motor hanging out at the mere mention of a wheelbrace, your pal Phil was at a loss for an extra pair of hands to help with the stretch-winding, when presto ! ! Straight out of the TV screen came a friend indeed, none other than that cheerful character, Terry Titmouse! Λ fairy story ? We e e e 111, it could happen by a stretch (li.nimm) of the imagination ! That gleaming scale Acronca Sedan, chosen as Model of the Month is certainly no figment of imagination. Hats off to designer Ron Young of the Mercury Models team who developed this perfect scale model for either free-flight or radio control. Spanning 65| ins., it has passed all flight tests using an Elfin 2-49, and is now Rakctema, is used to flying in sub-zero conditions. scheduled for kit production. Photography in the Take a look at No. 6 where his smart green bronze modern style is by Ronald A. Adams. biplane control-liner rests in the snow. Powered Seeing double ? That cannot be helped if you by D.C.350, the Bipe's fuselage is made of papier are studying pic. 1, of brothers F. and O. Fisher mach£, which gives a perfectly smooth finish. and their similar 6 ft. free-flying wings. O. Fisher’s The thought that a sailplane design, with wing has a D.C.350, whilst brother Frank uses a suitable engine attached, could l>e a good idea Yulon 30. Between them the Fisher Bros, have for duration contests, has apparently influenced made eight “ wings ”, so they should be ptcro- G. A. Sayce in building No. 7. 54 in. span and experts. No-tail to fish-tail in the next photo ! powered by the baby Alllxm Dart mounted up on There’s something finny about those tips, in No. 2, a pylon, this job has a shallow climb : but what a which is P. W. Hales' novel diversion from the otherwise very plain speed model design. Curved glide I The nose is also a handy prop-saver. tips help to straighten out turbulent airflow, as Another ” baby-engine ” fan, is Les Clarke of witness the 90 m.p.h. performance with Frog 500. Sunderland, seen in picture 8. The engine he Last month we published an action shot of a uses for this all-sheet " Golliwog ” bipe, is the model Stuka by G. V. Pottcrton, and now, in tiny -32 c.c. Kalper diesel. And how’s this for a photo 3, we have yet another Ju 87b, this time by record ; the Kalper is now in its fourth year of use. W. H. Smith. An additional feature of this blue and the model, originally built by Jim Robson, the and white camouflaged version is its delayed action club Chairman, is completing its third season. bomb release —really a case of Ware Stuka l ! It has been lost five times, had no major repairs, The very sleek red and silver twin Elfincd weighs 9 ozs. as a monoplane—14 ozs. as a bipe, stuntcr in picture 4 is the handiwork of J. B. and still stooges at a very slow flying sj>ced for Moorhouse (Lockwood M.A.C.). Careful construc­ 3 to 4 minutes under power ! Sounds like just the tion has kept the weight down to 30 ounces and job for beginners! Incidentally, the tail is allows a speed of 75-80 m.p.h. Wing area is nibbled for special trimming reasons. 300 sq. ins. Another ” twin ” comes in the next And so to number 9, another example of Ronald picture (5), only this time, it’s a free-flight job Adams' photography in the modem stylo, this time with two it.D. liee’s, designed, and built by G. W. of Phil Landray's new class B racer. The cowl Dodwell of Mitcham. A pendulum rudder of hides a McCoy 29 engine which tugs this neat model generous proportions is fitted as a safety measure around at 75 m.p.h. plus—very’ smart Phil, and in the event of unequal power. Area is 544 realistic too. sq. ins., span G2 ins., and weight, 18 ounces. At which Fliar Phil rests his pen and wishes one Brrrh I but it’s cold outside! And over in and all the very best of good fortune for the 1952 Sweden, Cecil Tomer of Modcllracerklubbcn (lying season. Aeromodeller 3° January,

CONTROL - 1, I X K DECK IAVIMV G

NE particularly interesting O feature of the State Jubilee Championships organ­ ised by the M.F.C. of Australia and East Coast Speed Club over 30th September-1st Oc- tot>er was the introduction of a Navy Carrier Deck event. Held in Erskineville Oval, Sidney, New South Wales, this new form of control-line contest did not attract a huge entry, but the fact that it was a great success with spectators and was very popular with the modellers augers well for this novelty at future meetings. The deck, made of marine plywood (and guaran­ teed to last for fifty years !), is 50 ft. long, 7 ft. wide and is curved to a circle of 60 ft. radius. It has a scale superstructure of a present-day aircraft carrier and the flight deck has downward sloping approach at each end to facilitate the landing. Six nylon lines with small sandbags attached arc stretched across the deck, and models arc fitted with arrestor hooks and motor control. Models are judged for appearance, take off and landing, and are timed for six laps fast, and then slow speed flying, gaining points for the difference between the two speeds. The carrier deck was very kindly donated by Mr. Ralph Symonds of Sydney. The event was won by Arthur Larritt flying a Frog 500 powered Foe ice Wulf 190, and Peter Sandford was second with his scale Hellcat. A strong wind made the landing approach par­ ticularly difficult for both the plane and pilot. Under favourable conditions and with plenty of suitable models, the event should prove to be a great boost to control-line flying. Top: Winning t'.W.IfiO gets the ‘nil clear' as It leave* the declt. Centre : Λ Hellcat and Spitfire, the sam e Hellcat Is seen in a glide landing which appears to hare overshot, in the Itottom left photo. Hcloir: Dummy superstructure adds realism to the Australian ('/I. carrier, tvhleh Is ti ft. longer and 2 ft. wider than those used in Ihe t'.S.A. J a n u a r y , 19 5 2 3i Aeromodeller

Yes! Why not? With everything in our modelling irorhl becoming more and more complicated it in a welcome change to return to one of the more simple form s of flying. And for those who derive pleasure from the shill of physical effort lies the satisfaction to be gained from the efforts of a first - class throw.

1II12 chuck glider is often regarded as the lowest form of life in the model world, and a very un­ 1worthy cousin of the more popular types of model. But those who deride the chuck glider because of its similarity to the 2s. beginner's model only show how little thought they have given to the matter. Regarded in the proper light, it will be seen that they possess exclusive advantages. To name just a few, they are inexpensive, their solidity and small wind resistance enable them to be flown in almost any weather, and almost any place, and a fly-away is by no means an impossible achievement, so put your name on even this small model. Few good chuck gliders are seen in this country, and this article has been written in the hope that it will arouse a greater interest in the model. Λ welcome step in the right direction was taken this year by the many clubs who introduced an event for chuck gliders at their galas. Demign When launched they are called upon to withstand loads often 3(i times in excess of those when in normal flight, due to the initially high velocity. Consequently, construction is usually solid. The high drag due to good sanding should be given, as it is obviously easier this speed tends to retard the model during the climb, to perform these preliminaries to each part individually. and for this reason the frontal area is reduced to a When assembling, give the wing fuselage junctions minimum, while the skin friction is reduced by a smooth three separate coats of cement, each being applied finish. after the preceding coat has had time to dry. The final gloss is obtained by giving one coat of grain-filler To guard against any looping tendency during the (a thick creamy mixture of clear dope ami l>or«acic climb, a low lift section at 0® incidence is usually powder), and thoroughly rubbing it off before applying employed. This, together with about 10° sweep back several generous coats of thick clear dope, sanding on each wing and about 3 ins. of dihedral per foot of down well between each coat. A useful tip is to mix a semi span ensures an efficient climb, and facilitates a few drops of castor oil with the dope, as this gives a quick pull out at the top before the model has had lime slightly better gloss. If the dope is thick, less co.ats to lose height. The best weight for a model of the size need be applied, and consequently (the writer blushes) illustrated is between 0*4 and 0*5 ozs. ami on no «account less hard work is needed in rubbing down. should it be heavier than 0*7 ozs. F ly in g Construction Trimming a chuck glider is the essence of simplicity, 'flic model described here is perhaps smaller than being performed by pressing small lead plugs into the that generally accepted as the optimum, although its reinforced nose, and cutting the plugs down until a consistent flight average of 45 secs, is proof of its long flat glide is achieved, after which they may be suitability. The fuselage is very similar to the American lightly riveted over. First see that the model is style and is made from 3 /32 in. sheet spruce sanded to a streamlined section. The wings are cut from $ in. (conlinutd ovttltnf) medium balsa and sanded to the section shown. When cutting the wings in half, the correct sweep-back is obtained by removing a triangular piece of wood with «an angle of 20 at its apex, which is on the leading edge. The wing roots are then chamfered carefully to give one wing 4 ins. tip rise {2 ins. dihedral on each wing). The tail surfaces are quite straightforward, being from 1 /32 in. very hard balsa sheet. Note the opposite-grain gusset let in at the leading edge of the fin. This is to strengthen the fuselage at its thinnest and weakest point. Before assembling, two coats of clear dope and a PLANS-

cewiewt

- section S H O ^ '“’NG-FU'

yjE'.GVVTS Μ ν

[Continued from previous page) flying in approximately 50 it. dia. and, for a right- handed person, anti-clock wise circles, by warping down the trailing edge of one half of the tailplanc. You may also find a little rudder adjustment necessary to get the model off the top cleanly before it lias lost much height. It is seldom that a chuck glider remains in trim for two successive outings, owing to changed wind and weather conditions, but even if the weather remains completely unchanged for a week, it is a rare occasion when the model docs not need slight alteration in trim. The diminutive and solid construction of the chuck glider leads one to believe that it could not alter its shape so quickly, and yet how else is this phenomenon to be explained ? It is a bouquet of the sensitiveness of the model that these slight warpings due to humidity changes make such a difference to the trim. To throw the model 40 or 50 feet into the air by the strength of the arm alone is energetic work, and until the knack has been acquired it seems a difficult feat, as the model will frequently fail to pull out. hurtling earthwards at its terminal velocity (another reason why construction is solid). It is futile to try and describe how to throw a chuck glider. Only practice makes perfect, so get chucking I

3/32' SPRUCE FUSELAGE # -SECTION 'a a '- SMOWING METHOO OF FIXING WEIGHT.

- FRONT VIEW. 1/4 S IZ E .-

1/32' HARO B A L S A T A IL Aeromodeller 34 J a n u a r y , 1Q52

K > 1 . 1 \ 1 ; rNOWN as the D.C. 350 Mk. II, the now diesel t i shows many improvements over the prototype analysed in this series in the Novel» ber, 1950. issue, particularly in its increased power output which now ranks highest in the 3*5 c.c. class. In its glowplug form, as the 35 (G), the peak output falls slightly short of the diesel figure, though in practice this difference will not be readily apparent. The small capacity diesel has always been recognised as an engine with greater power than its glowplugged equivalent, and we have no doubt that those who prefer glowplug operation will concede the superiority. Externally, the Mk. II diesel looks different only in its new “ Vee ” type compression screw, de­ creased fin area (there is one less fin, and the fin thickness is increased), and the spinner nut is replaced by a tougher hex. nut. Internally, there arc alterations to the porting and mode of assembly. By-pass channels in the cylinder liner are deeper though narrower, the carburettor bore is increased, and because of the revised assembly, it is now possible to ensure that two of the four exhaust ports register centrally with the slots in the cylinder jacket. This new “ plain ” liner is slightly heavier and still retains the unusual lack of contact with the cylinder finning. As before, the crankcase back-plug is left plain and screwed home tightly to discourage un­ warranted and often harmful dismantling. January, 1952 35 Aeromodeller

TEST D.C. 350 DIESEL, 3*5 c.c. Fuel : Mercury No. 8. Starting : Excellent. Running : Excellent at all speeds. Needle control flexible and easy to handle. B .H.P. : Flat curve to maximum of -281 b.h.p. N u m b e r 43 at 11,300 r.p.m. Fall-oil not so sudden as with the glowplug version. By Checked Weight : 5*71 ozs. (with fuel tank). L. H. SPAREY Power /Weight Ratio : *7808 b.h.p./lb. Remarks : The attractive grey finish to the clean cast­ ings 0/ this motor are well displayed by the contrasting amber coloured plastic fuel tank. Its robust construction should make it an ideal choice for the radio control en­ thusiasts. D.C. 35 (G) GLOWPLUG, 3-5 C.C. Fuel : Mercury No. 5. Starting : Excellent, facilit­ ated by priming through exhaust port. Retail Price: D.C. 350 Mark II. £3. 6s. 8d. Running : Very flexible needle D.C. 35 (G), £Z. 5s. Od. control, and smooth running are characteristics of Capacity : 3*44 c.c., -21 cu./in. D.C. motors and arc well evident in the 35 (G). Compression Ratio : 350 Mk. II, Variable. B .H.P. : A good flat curve is obtained, with 35 (G). 8-65 : 1. maximum output of -202 b.h.p. at 11,100 r.p.m. Mounting : Beam. Checked Weight : 5-4 ozs. (less tank). Recommended Airscrew : Free flight, 10x6 ins. Power/Weight Ratio : -776 b.h.p./lb. Control line. 9 x 8 ins. R em arks : There is very little difference in the per­ B ore: 11/16 in. S troke: 9/16 in. formance of these two motors, showing that there Cylinder : Nickel chrome steel. is considerable research in the glowplug version. Cylinder Head : Alloy, retained by six screws. Crankcase : Die-cast D.T.l). 424. GENERAL CONSTRUCTION I1ATA Piston : Mcchanite, ground and honed. Name : D.C. 300 Mark II, and D.C. 35 (G). Connecting Rod : Duralumin. M anufacturers : Davics-Charlton & Co., 13, Crankshaft : Nickel chrome, ground and honed. Kainhall Road, Barnoldswick, via Colne, Lancs. Induction : Rotary crankshaft valve. Aerotnodeller 3<> January, 1952

·ο·ο#ο·ο·ο·ο·ο·ο·ο·ο· for calling it a B-knop, which, we presume, is Ο Swedish for knot—thank you Mr. Bdrgesson. If wc had a pound with every request for gen on twin-engine control for free-fiight, we would have retired as millionaires long ago. Not that we § have been able to answer all the queries on the problems of the " multi ", but now we can at least refer to J. D. W. Croasdell's solution, shown as “ D Should one engine exert itself a trifle 2 more than the other, then the rudders will auto­ ο matically compensate for straight and level flight. • Then, if one engine cuts suddenly, it will admittedly NCE more, we clip into our bulging files of swing into a dangerous thrust angle ; but the O gadgetry to give yet nine more ideas submitted rudders can be arranged to correct the olfthrust by the ingenious in our ranks. There's something accordingly. Wc would advise a limitation of 6° for everyone this month, whether you 1*3 scale, movement each way on the main pivoted bar, as a rubber, power or control-line fan, so why not settle safety measure. back and digest these gems of usefulness and Reach for the salt, tip out the salt and keep the incorporate them in your future designs ? cellar! It's a useful substitute for a spinner Among the most useful of ideas introduced to (see 44 E ” ) says Mr. A. J. Munt. The plastic aeromodelling in recent years, and one which the variety are easy to cut in half, to file for the prop, A eromodeller has proudly introduced, is that and drill for the front bolt. Rear plate is made of classic safety device for all scale models or designs tin plate or brass, with nut soldered on to take the with doubtful stability characteristics . . . the bolt thread. Pendulum Rudder. The Belgians had their pet F. Stanton must have been watching Mum or version, our scale design contributors have other Sis in action washing their hair, and at the same ideas on the subject, and now, that well-known time noting the very useful transparent plastic Northerner, Vic Dubery, introduces the simplest container “ F ” they used to supply the necessary form wc have seen. "suds". Full of GLORIA shampoo liquid, and Claiming three distinct advantages, the Dubery to be seen in their thousands at departmental Pendulum Rudder “ A ” will (1) not flap in stores, chemists and the like, they are ideal for fuel slipstream, (2) not operate until the model banks tanks and unaffected by either diesel or glow-plug beyond a certain angle, and (3) applies correcting fuels. Just snip olf the corner to let out the rudder progressively. A simple balance arm shampoo, insert a fuel lead and you have a perfect pivots at R in the rudder, and rolls in a si>ecially flexible tank. shaped bulkhead to give the required corrections. 44 G *’ is another economic brainwave, cheap When straight and level, the rudder is safe and wheels made from sections of respirator tube. rigid, with the balance arm nestling in the base of M. R. Bromige uses a corrugation cut from old the curved bulkhead But when the fuselage gas mask tube to form a tyre over a balsa former. banks to right or left more than the pre-arranged A 12 g. bush, and ply facing discs on each side of 5° to 10° angle, the arm is free to swing, and the balsa core make a cheap but tough wheel that operate the rudder. Radius S should be at is much lighter than the solid rubber type. least 1£ ins. And so to “ H M which is R. W. Checseman's That age-old problem, how to transfer wing-ribs, simplified free-fiight " shut-off " tank, which is so bulkheads, formers and other specially shaped easy to make, that it should be within the parts from plan to balsa wood, has been answered capabilities of any modeller. The sketch is self- many times in this Gadget Review series. But explanatory, the only additional spot of advice wc the introduction of the now very popular bail-point would offer, is that the stop spring be made of type of pen, using a form of printers’ ink, has really springy brass. This is connected to any added a new slant to building from plans, as type of timer, and when pulled free of the nut on J. Spain suggests in 44 B *\ Just trace the part the shaft, the internal single coil return spring you want to cut out on to thin, or tracing, paper, pushes the shaft to cover the fuel outlet. reverse the paper, rub the lines with the other end Radial or Beam ? . . . that is a question that of the pen, lift the paper, and presto! An exact crops up with great regularity in jx>wer circles, reprint of the required part is transferred to and idea 441 ** which we saw in a recent copy of the wood. Air Trails provides the answer for all who wish to 44 C ’* is a B-knop. Well, that is what it is mount their " beam " motors radially. Coming known as in Sweden where many a Wakefield originally from Charles Atkinson of Jennings, motor is held tight and secure by this reef knot Louisiana, this simple device should meet with with a little bit extra. And we really must worldwide approval, and, in fact, we would not be apologize for having dropped the " p ” out of surprised if these mounting converters were put " Special ” in the sketch ; but we are quite correct into production by an enterprising manufacturer. J a n u a r y , 1 9 5 2 37 Aeromodeller

AF/U4N ffXWC.

mowtmg oar Aeromodeller 38 January, 1952

WORLD NEWS by ARIEL

OMPLIMENTS of the Season and good wishes hill of Man Summit, Kenya, is right on top, C for your activities in 1952, to the contributors (8,400 ft.), they are among the highest. and readers of this international feature, from its Mussoorie is 6,000 feet above sea level and it lias compiler, who looks forward to keeping the world’s been noticed that the power of their motors leaves acroinodcllcrs ” in touch ” during the coming year. much to be desired. There is very little that can Item of interest from 1951 A /2 Champion Oskar be done alxmt it in such rarefied air, for even at Czepa, is that the 1952 Contest will he held at Graz, peak revs, the power is greatly reduced. near Vienna. These modellers, also, have their nearest model Italy. The XIVth Italian Nationals were held shop in Calcutta. 980 miles away, and supplies take at Bresso Airfield, Milan, on the 25th, 26th and over eight days to reach them. Unfortunately, the 27tli of October, and we thank Ing. Nino Frachetti, balsa is often damaged beyond recognition by the Contest Director of C.A.M., Italy's largest aero- time it has completed its journey. modelling organisation, for his rejx>rt and photo. Contests in all classes were flown and all clubs were South Africa. A correspondent who writes represented in strength. With ideal weather some in as the result of a previous letter in “ World excellent performances were recorded. News ” is Gerald Matchett, Hon. Sec. of the Pretoria Acromodellcrs Club, and one of the National Champions were as follows:—Sail­ Union’s leading Stunt fliers. planes : Cassio Pisani, Pisa Club...2 flight, agg. .391 secs. Rubber: Alberto Lcardi, Milan Club— This is what lie lias to say :— 3 flight, agg. 843 secs. F /F Power: Giorgio, " I noticed in your July issue an interesting letter Genoa—3 flight, agg. 663 secs. Junior National from R. v. d. Mcrwe from Grahamstown. I know Champion: G. Vinccnti, Bologna. C/L Stunt: Roux very well, but his letter somehow gave the Pierluigi Gncsi, Pisa—305 points. Champion Club impression that the only flying done in the Union of 1951 : Aero Club of Pisa. was by the East London, Port Elizabeth and The heading photo shows, from left to right. Capetown coastal areas. Personally, I think that Kdgardo Sadorin, Wakefield specialist, Ing. more flying is done near Pretoria than by any Frachetti, Col. Jacopani, Sec. the Aero Club of other two clubs put together. This is proved at Milan and General Leoni, who flew the Atlantic every S.A. National Championship, when Pretoria with General Balbo in 1933. has won more than half the country’s hardware !” I ml in. Of the many “ lone wolf” modellers We pass on, without comment. with whom we correspond in all parts of the world, Matchett goes on to tell us of some of his Club’s 1). Hardaker of Shimshapura,- Mysore State, 1951 activities, including demonstration flying at Southern India, must be one of the most isolated. the Benoni Air Club (full scale) Rally. The four He estimates tliat the nearest enthusiasts to him Stunt Kings of the Club, who gained the first arc in Calcutta, some 900 miles away, where is his four places in the S.A. Nationals, namely Gerald nearest model shop also. His flying field is eighty Matchett, Cliff Culverwell, Monty Malherbe and miles from home, and as he is a keen Power modeller Bill Kotzc, flew four “ Chiefs ” in a circle, followed this must be somewhat of a hardship. by synchronised aerobatics and dog fights, in pairs. In his last hitter to us his main worry was about They have practised the latter to a point where the rubber in a newly-built Wakefield ; tem­ they fly one inverted and one right way up, and peratures at that time were 133°F. in the sun, can manage the ” opposite directions ” act with though, as he puts it, but 100VF in the shade. three in a circle. Despite these inconveniences, modeller Hardaker Not to be outdone by a full-scale demonstration carries on with most commendable keenness. of balloon bursting, they promptly tethered a Also in India, although some distance from balloon and proceeded to burst it. Mysore, are Messrs. Gilmour and Gottlieb at St. Pretoria is another place where they go in for George's College, Mussoorie, United Provinces, who the ” marathon ” free flight business ; maximum feel that, if they are not the second highest time in the air during a two hour period, with modellers in the World, assuming that Mr. Hemp­ flights of three minutes and under only counting. January, 1952 39 Aeromodeller

Due to two flyaways (32 and 35 minutes) our this occasion the R.A.F. carried off eleven of the correspondent made second place in the last of first twelve places in the Sailplane event, the these events. * exception being sixth place. Cowley made his On Sundays at the Club flying field at Waverly ” hat trick " with another first. Carter came top) there is always plenty of activity, including three in Rubber for the R.A.F., but Bill Heckler and his or four members with R/C jobs. They have " Sailplane ” repeated the Power success. The really progressed in this direction and perfectly l.atter flier obtained second place also in the Power, controlled flights are the order of the day. flying a ” Playboy ”, while third and fifth places went to the R.A.F., Parker taking both of these. Member Carl von Ahleveldt came out with a Flying at 5,000 feet altitude, Bill Heckler raised new twist one Sunday ; he tied a chuck glider to his own speed record to 107 m.p.h. with a McCoy an arrow and then shot the arrow with a proper powered deBolt design. bow- some flights! At the Empire Air Show at R.A.F. Heany, the In closing, reader Matchett mentions “ dog­ Club put on a static and a flying display. During fighting in Stunt **. This comprises four or five this display four members built a ” Nord ” which jobs in a circle with 6 feet long papier windsocks was raffled, raising ten guineas for the R.A.F. tied to the tailskids ; the chap with the most paper Benevolent Fund. left is the winner ! We believe that this has been tried elsewhere, but the Pretoria boys do it as a The next big date was in October—the Rhodesian regular thing. Nationals, at which visitors were expected from South Africa to increase the competition, and we Southern llliodesia Flight Lieutenant \V. G. look to F/Lt. Drinkcll for a report of this meeting. Drinkcll, R.A.F. Ileany, Bulawayo, has written us He tells us that the Club is a member of the R.A.F. an interesting letter about aeromodelling at 4,500 Model Association, and that its members are all feet and higher, for that is the height above sea insured. They are all firm believers in dether- level at which one finds R.A.F. Heany. maliscrs and, except in contests, no model flying The Station Club, formed just about eighteen is carried on between 10 a.m. and 3 p.m., due to the months ago, lias overcome its initial set-back of strength of the thermals. F/Lt. Drinkcll asks us shortage of supplies with the aid of one of to add a footnote for the benefit of R.A.F. modellers Bulawayo's leading Sports’ shops, and is now posted to Rfnxlesia - pack your modelling equip­ making healthy progress. Free Flight, English ment, for a warm welcome awaits you at Heany. diesel powered, has led the field, gliders and C/L Local prices are about the same as in the U.K.— Stunt collecting their following during 1951. The less the Purchase Tax ! Club hopes to tackle C/L Speed seriously. The only other club in Rhodesia is the Mashona- land Model Engineering Society, at Salisbury, among whose members is Bill Heckler. National Champion of Southern Rhodesia for two years running. His eleven-year-old son is being brought up to a high standard of aeromodelling and should enhance the family reputation. Three contests have been held during the past eighteen months ; the first, in October, 1950, was at Salisbury, and the Heany contingent travelled the two hundred miles in four Harvards. L.A.C. Cowley returned with first place in the Sailplane event. A return contest was held on Easter Monday in which over eighty* models were entered. Cowley «again won the Sailplane event, F/Lt. Drinkcll taking second place with a newly-finished “ Nord ". The Power contest was won by Bill Heckler with an Ohllson powered " Sailplane " and he put up a speed of 101 m.p.h. in the Class V Speed event. The last contest reported, at Salisbury last Whitsun, was attended with the aid of a well-loaded Anson, for model transport, one car and eight Harvards. The Club members piloting the latter aircraft were, of course, on training flights. On

Officer Cadet tioddord ( H .4 .F .) w ith h i» ** Stunt Queen ” at S. Hhodeaian Air Force station, Cranhoume, Salisbury. Lunch inUn-cat at Contest explains the Inch of ** Inals ” . Aeromodeller 40 J a n u a r y , 19 5 2

Readers’ Letters Price» and Profit» to force many firms into liquidation if Customs In riew of the importance of the subject m atter, tee reproduce and Excise can ultimately demand full payment. below a letter and editorial comment reprinted from our contemporary “ Model Aircraft ", followed Int a reply to Xlr. May I inform Mr. Netherclift that my own Netherclift from Xlr. Paterson of Plantation Wood. Our own business showed a trading loss of ,£7,000 for the comments on the. subject will be found In “ H e a rd a t th e Hangar Doors year ending April 1950 as the result of our en­ D e a r S i r , deavours to get balsa wood out of Trinidad. This could only have been avoided by increasing our I would like to point out a fallacy in your prices which, on a long-term policy, we had decided ” Here and There ” paragraph entitled “ Hard and to be bad for the trade as a whole, but which, in Heavy—Light and Strong ”, September, 1951. the long run, was nearly our undoing. 11 was these You point out that the price of balsa wood in Trinidad supplies which literally kept the trade U.S.A., in spite of being nearer to the source, is the going for some two years. same price as here, whereas in fact it is cheaper than here to the actual user, for both wages and It is so easy to make the suggestions contained in prices arc higher in the U.S.A. Mr. Netherclift’s letter, so much of which we have heard during the last Election campaign. It is The advent of purchase tax must have made it only those of us who have to run businesses in clear to all those who can put two and two together these present very difficult times who know' the that profit levels on aeromodelling supplies are not risks and difficulties which have to be overcome. by any means meagre at the present time. On one hand, Mr. Netherclift says that the As a club treasurer I know only too well the increased cost of the hobby should be shared by all difficulty of members, especially juniors, to keep up interests and, on the other liand, in liis second with club subscriptions, increased cost of their paragraph, implies tliat because, with the advent of hobby, and associated activities and I would Purchase Tax, full Purchase Tax has not been put respectfully suggest to the trade that our interests on, there must have been more than adequate are their interests and tluit all increases should be margins to absorb the difference. He really shared by all, not borne by the modeller alone. cannot have it both ways. j y p ATERSo n . It would no doubt be very interesting if the leading firms concerned published their audited annual Plantation Wood (Lancing) Limited. accounts in the journals. G j N e t h e r c l i f t . The Junior <|ue»iion Hon. Treasurer, Ilford & Dist. M.A.C. D e a r S i r , Our corresponiient's implication that profit margins in th e With reference to the article on page 713 of mode! aircraft trade are. higher tlum those in other Irattes is very far from fact. In few Industries is competition so keen your December issue, I should like to put in my and only by large scale production hare the prices of most "two cents” on the Junior question. Just so products been kept down to their present leerl in spite of greatly increased costs of raw material*, laltour, and the that you know without delay which side I take, let Imposition of purchase tajr.—The Editor, ·· Model A ircraft.” me state tliat in my opinion Juniors are the bane of Model Clubs—the greater majority of them are, D e a r S i r , as your correspondent says, unduly noisy and I invite Mr. Netherclift to visit me here at these utterly unproductive. They arc useless as far as Works, when 1 could very clearly give him a contests are concerned, will not take building or picture of the difficulties of maintaining supplies of flying tips from Seniors, and arc apt to cause balsa wood at reasonable prices. The only reason discredit to clubs by their generally low' standard that there are supplies of balsa wood for aero- of construction of what models they do produce. modellers in this country is because of the There are, of course, notable examples of this, as stupendous efforts that manufacturers have made there arc equally notable exceptions (two of our on export sales. This Company has to maintain four Juniors got awards at the M.K. Exhibitors !). higher prices for sheet and strip in retail shops in And my answer to those who try to palm off the this country so that we can sell sheet and strip platitude tliat ” the future contest men are now abroad at lower prices and keep down the price of Juniors ”, I say this : A lot of now good contest balsa wood to manufacturers in order that their men started aeromodelling at ail adult age. kits will sell abroad. Keenness is what counts. Aeromodelling is a Mr. Netherclift little knows the risks that the sport which cannot be identified as a game, as with majority of manufacturers took in endeavouring to toys. It is a serious, scientific and great hobby, as avoid the imposition of Purchase Tax on Model adult as any you can think of, and the difference of Aircraft materials, and how desperate a fight has the opinion of the public will be determined by the been carried on for two years to keep the majority attitude, behaviour, and performance of those of the trade in being. Every manufacturer has people seen on the flying field 1 demands for Purchase Tax uncollected from the I wish to specify quite clearly that I have aeromodelling fraternity for a period of eighteen stated my own personal opinions throughout. months, and the size of the figures are such as West Middlesex M.F.C. J . C. P lank. January, ig$2 41 Aeromodeller

IVIAIIIItll

g l i d e r JU LIAN YALLEN

(Reprinted by courtesy o f ·· F lig h t” ) A N engineer (who in his youth had been a A " bug-hunter ") stood on a mountain cicst in Malaya, prospecting for a road. Below him was a little valley, where grew tree-ferns like palms and yellow rhododendrons. His attention was fastened on what seemed to be an unfamiliar butterfly down in the valley ; it was not its colouring that was striking but its curious, lilting flight. As he watched lie saw that it was meandering up the hillside and would cross the ridge nearby. He ran to get a closer view; and as it passed twenty feet overhead, he threw his hat at it. By great good luck he brought it down and discovered it was not a butterfly at all, but an extraordinary gliding seed. of the tailless or pterodactyl type. The flexible Many seeds are great aeronauts. They balloon, wing-tips act as automatic stabilizers. parachute, rocket and auto-rotate ; but only this In performance this glider is infallible. Nothing one actually glides. The specimen caught by the one can do prevents it from automatically re­ engineer on the mountain at an altitude of six suming its flying attitude. Its progress is as thousand feet was still rising. Being a glider of follows : a nose-dive flattening out into a gentle perfect performance, at such an altitude it might glide, then a climb to a stall (a tail-slide is prevented well have covered hundreds of miles. These seeds by the flexible trailing-edges): the nose dips, and have, in fact, been seen flying over ships six the process repeats itself. hundred miles from land. It can be released from the hand head-first, Its botanical name is Macrozanonia Macrocarpa. tail-first or with wing-tips pointing vertically It is a kind of climbing gourd that grows in the down—in fact, released anyhow—and immediately jungles of the Malayan Archipelago and is about it becomes stable and goes sedately on its way. as large as a football. Each seed, very flattened Sounds almost too good to be true, doesn’t it ? and approximately the size of a shilling, is em­ Nature's own design for an automatically stable bedded at the centre of a diaphanous filament of tailless might be the basis for a good model design. half-moon shape ; these filaments lie within axial The flexible edges could be difficult to reproduce : planes, like the pips of an orange. When the fruit but doubtless some enterprising modeller will find decays, it falls apart and the hot sun dries the the solution to that problem. Inquisitive readers filaments, which then float away on the breeze. may care to visit No. 3 museum at Kew Gardens Each filament is semi-transparent and has a where they may find a specimen and form their own silky sheen, which glimmers silver and gold in the opinions. Kc-clissificd as Alsomilra Macrocarpa, sunlight. Its wing-thickness is delicately graded the remarkable fruit and its seeds arc exhibited for so that the margins, including that of the leading all to see and admire, though not in action we edge, are flexible. About six inches in span, it is regret to say.

READERS’ LETTERS {continued) Sportsmanship motor, and played heck when he was told he would Dear Sir, have to be disqualified for that round.” I have been an aeromodeller for some 18 years, and 2. Indoors at Manchester (p. 60Λ). " The incident when although my activities have been reduced recently Maxwell’s model was r written off' through lack of because of family ties, still keep as closely in touch with consideration on someone’^ part.” the movement as I can. For some time I have noted 3. All Herts. Rally (p. 067). “ The poor sport who with regret the decline, particularly since the war, continued to operate his equipment on the hangar in the sportsmanship and general atmosphere of friend­ apron during the contest, and was probably ship that 1 have always associated with our hobby. responsible for the destruction of Roger Clark’s With the November issue of the Aeromodeller enlarged Gipsy.” it seems matters are going from bad to worse—a few On the whole a pretty poor show, and strangely quotations will serve to make my point enough, covering most of the aspects of our hobby, 1. The Yorkshire Evening News Festival (p. 063). i.e., Power, Indoor and Radio Control. '* Λ brickbat for the individual who spent no less Surely we can do better than this ? than seven minutes trying to get a spark out of his T. N. S i m p s o n . Aeromodeller 42 January, 1952

\ GLANCE at the window left no doubt that Messrs. YOUR MODEL Jones Bros. of Chiswick was a model shop, and inside there was a warm friendly atmosphere enriched SHOP by the pleasing odour of fresh cut timber. Established some forty years ago by two brothers the N o . 2. business originally catered for the needs of the amateur wood­ worker and handyman, and started selling A-frame Warnc- ford pushers directly after the first World War. One of the oldest, if not the oldest Model shop still in business, it is now run by Mr. Λ. 1>. Jones, following the sad loss of his brother " G. W." live years ago. Mr. Jones is ably assisted by Messrs. Tolley and Frye who have been with the shop for twenty *and ten years respectively, surely a record in Model shop service ? We were not altogether surprised at this, as there is an air of homely efficiency surrounding the proprietor and his premises which evidently inspires cus­ tomers’ confidence as well as Still smiling in spite that of his staff. Both assist­ of serving itertjtnoiifi­ ants are practical modellers, le rn for I treaty years ! M r . T o lle y o p en in g up not only in the aeromodclling a hit for a customer. sense, for Mr. Frye is Chairman Belotr, “ the shop of the local Model Railway with the stock ” is no idle boast as can be Club, and besides building over seen from this in­ 100 aircraft, even finds time terior shot. Behind for model boats. the counter arc, left, Mr. Λ. D. Jones, and We were told that the right, Mr. Frye. aeromodclling side of the business had grown tre­ mendously during the past fifteen years. Due. according to Mr. Jones, to their untiring efforts to maintain an up-to-date and compre­ hensive stock, plus attention to the speedy dispatch of home and overseas mail orders. We noted witli pleasure that customers purchasing engines were invited to a test rig at the rear of the shop where the engine was demonstrated to their satisfaction. Apparently this is carried a stage further with begin­ ners, who ate shown how to start their engine, and who leave, confident in their ability to operate it. This is an excellent scheme as so many newcomers are dis­ couraged through what is, in actual fact, their own inexperience, with the unhappy result that they blame the motor, and their subsequent disillusionment loses acromodelling another recruit. It is Messrs. Jones Bros, boast that their stock is as comprehensive as can be found in the modelling trade and we can well believe it. The well-lit interior was the most orderly example of a quart in a pint pot as we have ever seen ; with kit boxes stretching from the floor to the ceiling ; with shelves groaning under the weight of dope jars ; and with balsa of all shapes and sizes in neat racks along the counters and walls. The way the staff managed to remember the home of each individual item, as customer after customer received his require­ ments with unfailing promptitude, was a source of amazement to us. Possibly the answer lay in the firm's motto handed to us by Mr. Jones as we were taking our leave :— " Don’t dabble with dozens and dwindle, Dul grapple with grosses and grow.” January, 1952 43 Aeromo deller

(HVTItOI WOTKS BY HOWARD BOYS

Author lloirtirit tings dlxphtg* out· a/ hlti rmdio-eont rolled /Iging icings irhlch he Jtric irlicit on a recent rlult to Eaton Hrag. Full h;»ound to have similar ex­ read your radio articles avidly in the hope of learning periences. Let us start with the tuning lever, as something, but this month’s notes really lost me. It that is the most easily disposed of. In some looks like knitting instructions ! receivers, such as the K.D. and E.C.C., the tuning Anyway, / have at long last installed my li.D. is by screwing a dust iron core in and out of the Mk. I l l receiver in a boat. Then came the great coil, and the screw has to rotate a few times to moment. I switched on and adjusted the resistance make very much difference. This helps to tune-in until l got 1-5 m.a. Keyed the transmitter and got a exactly to a weak signal. With the transmitter drop O.K. but nothing from the actuator. Switched close by, the receiver is swamped with the signal. off again and fooled about blowing imaginary dust The answer is to take the receiver some distance out oj everything and tried again. The actuator spun away, \ mile at least. With the receiver in tune round about six times ! The transmitter wasn’t even the current will be low, and out of tunc, with the switched on. On closer examination the actuator lever rotated either way, the current will rise. The contacts were closed and the only way to unlock them lever may rotate three or four times between the was to switch off! More blowing down things. two out of tunc positions but the centre position Tried again. ’Click/’ went the actuator and should be found by counting the number of turns. remained locked, the meter needle being almost zero. A rod of insulating material (three or four match- So I waded through about six months’ Radio sticks long) should be used to rotate the lever to Control Notes, found no help and finally upended keep the hand well away, as the hand held close the receiver and peered into it. Well, by this time I can alter the tuning. was ready to take a chance, so I messed about touching Now for relay adjustment. Fig. 1 shows two a brass spring with a matchstick and the contacts different types of relay. The screw A adjusts the opened. Curiouser ami curiouser! Breathing width of the gap when current is flowing through heavily and thinking hard, I decided that the small the relay coil. There must always be a gap or screw opposite the spring wanted unscrewing. I now there will be a danger of the relay sticking, though call this piece of equipment the relay, by the way, the gap may be so small that it needs a light behind rightly or wrongly. “ The thing was sent out with to see it. The smaller the gap, the more pressure the contacts out of adjustment ’’. Eventually, by will be applied to the contacts, which makes for trial and error, I got the thing to work. Following reliability, but this also means a greater current the maker’s instructions I set the receiver at 1*3 m.a., change to oj»erate the relay. Screw B determines keyed and attempted to tune. Huh /—dead loss ! the amount the armature moves. The greater the For a kick off the needle was about as low as it could movement, the greater the current change required. go without bursting the side out, and secondly I There must however be an appreciable opening of couldn’t get anywhere near the coil lever without it the contacts. Sometimes both screws A and B are going still lower. But even then that lever didn’t used as contacts, but sometimes only one screw is make any difference that I could see. In the end I used, according to the actuating system. When had turned it about so much that / didn’t know where the current through the coil is reduced, a spring the original setting was. At the moment range is pulls the armature to close contact B, and the more than I shall need at about 1*3 m.a. and the drop strength of this spring is usually adjusted by a Aeromodeller 44 January, 1952

i m.a. below the idling value, and the contact should close with the current about £ m.a. below this. There will usually be a difference of about ^ m.a. between the opening and closing positions. When adjusting a relay then, start with a small gap, and small movement, about 2 to 4 thousandths of an inch if you have means such as " feelers " to measure with. A piece of newspaper will be tight in this gap. Then adjust the spring to try to get the movement at the right values of current. Relays are a bit delicate to adjust, but it is well worth while being patient. The next item is from Mr. F. Sale of Oldham, who has one of those ideas that makes you wonder why no one has thought of it before. A four-position (not self-centering) type actuator has been converted to self-centering in such a way that current is only used to change from one position to the next. Turn is held on so long as the transmitter button is kept pressed, but the escapement battery is not being used all the time. Fig. 2 shows how a washer is riveted to the paxolin base concentric with the escapement shaft, and saw-cut to form the commutator. Note that countersunk rivets must be used and the surface made smooth. Brush holders, fig. 3, arc soldered to the escapement arms as shown in fig. 4. The carbon for the brushes can be obtained from the centre rod of an old dry cell. Fig. 5 is to explain the working. Take relay contact A to be closed with no signal. The brushes will then be across B.B. and the rudder will be at neutral. On receipt of a signal, relay contact B will close, and cause current to flow’ through the escapement across the segments B.B. energising the coil. This releases the escapement, and the brushes move from A.A. to B.B. As soon as the brushes have passed the cuts, current is cut off, and the pawl catches the next escapement arm. This moves the rudder over. When the signal ceases the relay makes contact A, and current then flows across A.A. and the escapement makes another step to give neutral rudder, and so on. Another scheme from Mr. Sale is shown in fig. 6, ACTUATOR WITH A A T C M tr TO ΙΤ Ο » for keeping the actuator near the c.g. of the model. VM TIKftlNO Enquiries are received at times about the use of ex-government equipment. There is a little useful screw C. The strcngtli of the magnet depends on stuff about suitable for transmitters, but not much the current flowing through the coil. When the for receivers. Hard valves for receivers are the current rises above a certain value the armature 1S4 and 3S4 at 9 /- or 10/- each, also Aladdin coil is pulled against the spring and closes against formers with dust iron cores at 4d.. though the screw A. When the current is reduced below a newr price is only 8d. Small tuning condensers can certain value the spring pulls the armature to close also be obtained, but here again the saving is only against the screw B. This screw is used as the a few coppers. Transmitters can, however, be contact for ordinary working with an escapement. made up economically, chiefly by using accumu­ The best current values for operating the relay lators that can be recharged, for the low tension, depends on the receiver, with the XFGl valve, and at the same time drive a motor generator, or the current usually drops from about 1*3 m.a. to vibrator pack to provide high tension. Two-volt about zero right up to the limit of its range, but accumulators are available at 5 /- to 7/— each, and with some hard valve receivers the current drop three of them will drive a 20-w'att motor generator gets less as the range is extended. With the rated at 11 or 12 volts. With β volts in, up to XFG1 type, then, it is best to operate the relay at 7 watts H.T. is available, and the M.G. costs 10/-. about the ’7 m.a. position, and with the other type With 12 volts input it gives 480 volts at 40 m.a. the contact B should open with the current about H.T. A 6-volt vibrator pack delivering 180 volts January, 1952 45 Aeromodeller at 40 m.a. can be obtained for 16/6. Suitable The circuit constants used for the XFG1 are 6-volt valves are : 6C4, 7 /-; 6J 6, 12/6, 7193. 2/6 ; (as per present-day arrangements) quite wrong RK 34. 7/-; 6V6, 7/6 ; all of which will handle and the reason for the short life of this valve is the the full 5 watts we are allowed. Other suitable heavy peak current during the quenching period. valves that can be used two at a time to handle The circuit constants for the self quench condition 5 watts arc : EF 60. 5/-; SP 61. 4/- ; P 61, 4/-; are such as to allow the valve to pass very high 956, 5/- ; RL 18, 5/-. The 6J 6, 965. RL 18, and current during the positive going half cycle of the perhaps the RK 34, could be used for the 465 mc/s. quench frequency which is generally of an ampli­ band. For a battery transmitter two 1S4 or 3S4 tude far too high and at too low frequency. The could be used. There arc some H.T. batteries at optimum frequency for quenching at 27 mc/s. is 8/11 for two 60 volts, and 3-volt cycle lamp between 30 and 60 k/cs. The amplitude being batteries at 6d. each. Aerial rods, about one foot determined by the value of the grid leak and the sections, that plug into each other at 2/ - per dozen anode decoupling condenser and to some extent just about completes the list. the grid condenser. The tuned circuit must have The writer's present transmitter was built over a high Q (quality factor) which means high capacity 18 months ago and uses 6-volt accumulator, to low inductance ratio. 20 watt motor generator, and 6C4 valve. The Some tests have been made on XFG1 valves circuit is given in fig. 7. There is a central partition taken at random from stock, and a new valve in a to the box with the accumulators one side, and suitable circuit ran for 60 hours at a standing everything else the other side. A small gearbox is current of 2 milli-amps with 45 volts H.T. The built on the end of the M.G. coupled to its shaft to current drop obtained from a command signal drive an automatic “ mark-space " control switch from the transmitter is approx. 1-8 m.a. for proportional rudder control, the operating A further test was made on an XFG1 valve lever being brought on top. Counting up the cost which had been used and thrown out after a few of this transmitter we g et:—accumulator, 16/-, hours’ life in a . . . popular? present day circuit. m.g., 10/-T·, valve, 7/-, the rest, say, 6/-,—a total When used in the special test circuit it gave a of 37/-. The upkeep cost is only that of charging further life of 20 hours and was run during this the accumulator, which with a home-made trickle period at a standing current of 3 milli-amps. charger is minute. Another test conducted on an XFG1 valve was as After giving such a list of valves it would perhaps follows. The test receiver was set with a type 73 be best to quote preferences. First, 6C4 or 6J 6. relay in the anode of the valve, a new XFGl. The Although the writer likes the 6C4, the 6J 6 should anode current was set a t 2 milli-amps at 45 volts be better. Next, the EF 50 and 6V6. The others H.T (actual measured H.T. at the anode would of are not much favoured, although satisfactory, course be lower due to tbe drop by the resistance of except for the 955 for use on 465 mc/s. the relay and the decoupling resister (variable) for Finally here is an interesting letter from controlling the standing current. A transmitter F. C. Judd of Messrs. Flight Control concerning was set running, keyed every half second thus allow­ the X.F.G.l. valve. ing the receiver relay to operate at the same speed. ** May I settle this business of the ' life ’ hours of The test set up ran for over 60 hours without the XFG1 valve once and for all. It has been adjustment. At the end of the test the standing discussed in Mr. Howard Boys' Radio notes many current was measured at 1-9 m/a. The aerial, times and so far no one has given a worthwhile approximately 30 ins. long remained unaltered. explanation as to why the life of this valve is 'The current drop on signal was approximately 1*8 limited when used for self quench receivers for milli-amps. The circuit I am afraid is not for Radio Control. All this nonsense of alteration to publication at the moment, but I can tell you that aerial lengths, tuned circuit. H.T. supply, etc., etc., it involves no more components or weight.” will do nothing to increase the life of a valve operating in a circuit not designed for it. Few people realize that with a normal valve (hard type) it is impossible to obtain a reduction in anode current due to an incoming signal from the transmitter if the circuit is correctly operated as a self quench receiver; that is, oscillating at both fundamental (27 mc/s.) and at the quench frequency, which should be around 30 to 60 kc/s. and at an amplitude determined by the value of either the quench frequency inductance's and grid circuit components, or in the case of self quench receivers, as those using the XFG1, by the values of the grid condenser, decoupling (H.T.) condenser and the grid resistor, the Q factor of the 27 mc/s. tuned circuit also plays a great part in the general stability of the circuit as a whole. Aeromodeller 46 January, ig52

AI tore left, a flight of So. 17 Squadron shot ring HIS month’s subject forms a comparison with squadron marks and streamers on the flight lead­ T the currently sensational Hawker P.1007 er’s machine, and above right, " dtOrge" Itulman b a n k s a II ooilcock over Itrooklands. (Photos fighter for, while this is the latest, the Woodcock courtesy of “ A e r o p la n e " a n d “ F lig h t * '.) was the very first of the long line of Hawker fighters. mounted on the fuselage sides, well clear of the When the old Sopwith Co. dissolved in 1920 the cockpit to shield the pilot from muzzle-flash at Hawker Engineering Co. was formed to provide night. The usual four 20 lb. bombs could be employment for the Sopwith employees who built carried on racks below the bottom wings and an motor cycles until new aircraft work came along. 18-gallon centre-section tank could be fitted for In 1922 the “ Duiker ** monoplane was produced, and in the next year a new single scat interceptor extra range. took shape and two differing prototypes appeared. Entered in the 1925 King's Cup Race was the One had single-bay wings, and its ancestry was “ civvy ” Woodcock G-KBMA, but during the obvious, for the fin and rudder shape of the war­ race fog caused Bulman to hit a hedge and a tree, time Sopwith scouts was preserved, together with and so completely write-off MA while attempting a the humped fuselage. Each cylinder of the forced landing near Luton. 300 h.p. Jupiter engine was enclosed in a streamline The Woodcock was retired in 1929, by which helmet with a controllable shutter. The other time the new all-metal Hawker Heron, Hawfinch machine had two-bay wings, horn-balanced rudder and Hombill fighters were on the scene. and an A.S. “ Jaguar ” engine was fitted, but this C olour. Matt -silver dope with usual R.A.F. roundel·, strings and version was not continued and it was the Jupiter «•rials. No. 3 Squadron marking was a green band along fuselage prototvjie J6988 which made the first public sides and on top wine, and No. 17 Squadron had double black zig-zag appearauce at the Hendon Air Pageant in 1924. in similar position. Cowling and cockpit coaming was dark grey. Construction. All wood. Fuselage had ash longerons and spruce Here, the Woodcock was flown by (then) F/Lt. Struts with tic-rod bracing. Wings had two spruce spars with built Bulman who had become Hawker test pilot, and up ribs and internal bracing. Tail surfaces had steel tube spars and later the usual trials at Martlesham convinced the outlines with wooden ribs. Specification. Span : 32 ft. (I ins.; Length : 20 ft. 3 Ins. ; Air Ministry that the R.A.F. should have the Loaded W eig h t : 3.040 lbs. ; M a xim u m Speed : 143 in.p.h. a t sea- Woodcock. level, 115 tn.p.h. a t 20,000 ft. ; C lim b to 15,000 ft. in 10 m ins. Service The first R.A.F. machine to be specifically ceiling : 21,500 ft.; Duration : 3) hrs. designated as a night fighter, the Woodcock was issued to No. 3 Squadron at Upavon and to No. 17 at Hawkinge in mid-1925, and gained popularity because of its comfortable cockpit and good manoeuvrability, despite its clumsy looks. This service version was the Woodcock II with 380 h.p. Jupiter IV, and had two machine guns

A 1■Voodrurk 1/ expertmentally fitted icith leading edge slain on hath iri'iif/a nnd connected to the ailerons by ex­ ternal punh-pall rods. (Photo by courtesy of Ilatcker.) January, 1952 47 Aeromodeller Aeromodeller 48 January, 1952

ESPITE the revival of interest in geared motors D during the last two years, I have been unable to find any published work which compares the s iiumii! MOTORS beliaviour of tensioned motors with that of un­ tensioned ones. Several authorities have stated s that “ they were sure that the untensioned motor gave more torque ", and that is all. It has always \ TENSIONED OR seemed sense to me to try to find the answers in these cases, and the answers here presented are so surprising that I feel them to be of interest to all UNTENSIONED? serious rubber enthusiasts.

IPaJrr/lffd /on* the world orrr are fared trilh The tests were made on a motor of ten strands three altenuitires tin· 1952. Some trill use the of J x 1/30 Dunlop rubber, ten inches long. neu· long fuselage idea to accommodate lengthy un tensioned motors. Others will enter the Rubber is chancy stuff to handle when looking for realm of gears, and the rest trill be using longer accurate results—the graphs shown here are the but tensioned m otors. W hich of these trill μη»re superior rem ains to be seen In the field. average of a large number of separate runs, any FRANK BETH WAITE one of which may have varied quite appreciably offers a practical comparison of tensioned and from the final average result shown. One thing is untensioned rtibber motors which should serre as a guide for thoso who arc not contemplating sure, however—the variation was not due to gears. The upper graph shows the greater fatigue, for I was very naturally on guard against output of tensioned oct'r the untensioned motor. In the lotrer graph. this, and detected no sign of it. The first test was to wind the motor to about half turns, and then take torques every twenty turns unwinding. This was repeated several times

gPMEftfflSQN, o f , with the rubber stretched between hooks 10, 9, * UNTENSIONEP MOTORS. 8, 7, 6, 5 and 4 ins. apart. It was instantly IO JTBANDS 114% UX>* 0W410P. lO'lONQ apparent that there was precious little difference between the various " hook lengths ", except for the increasing number of turns lost as the slack / was increased. As the graphs needed considerable ... / smoothing even after a large number of repetitions, I felt that the most accurate way of comparing the various tests was to compute the actual stored energy of each group of runs : that is, to multiply 1 turns by the average torque. These figures are sTOBCD CNCRGr. presented as a percentage of the energy stored in IO* - IOOe/o the untensioned motor. 9* - 99JeA> β* - IOI o % TOBQUl 6* Finally, the tests were made at high turns- - (INCH 02» ) * 7 * - 97·4β/ο 6* - 98 J°/o j about 80 per cent, of the calculated breaking point. y v $* - 977J°/o Here again, a number of repetitions indicated no '■'4* 4* - 41 OOe/o ! noticeable fatigue, and again the stored energy 1 * - 1 figure gives the most accurate result. Here, (BOOKING POINT however, the shape of the graphs is of interest. Notice particularly that as the slack is increased, the slope of the graph is reduced through the i " cruising climb " range, in other words, a longer and more powerful climb is gained with the slacker j - motor. Obviously, the turns " lost ", as the slack is increased, have a much smaller effect at near maximum turns, and it is this condition which is of paramount interest—contests arc not won on half turns. It is not claimed that these few tests, concen­

TOOQUC trated as they arc on one size of motor, necessarily (in c h 0 2 ») Τ' give the whole story. As far as they go they are 7 * JTOBCD fNIB or accurate and consistent. And the conclusion is 7 IO' IO* - too°/o j that for the best climb, a rubber motor should be / 7 * - IOJ3°/o 4* 4* - 474J°/o! stretched between hooks some 60 to 70 per cent, i I ί r of its unstretched length apart, and obviously some —------b — v tensioning device will have to be used. Gears 20 40 60 60 IOO 120 «40 160 1*0 200 220 240 260 appear at best to be an undesirable complication, IUONS------(lACAKING POINT JOO APPROX.) and at worst merely dead weight. January, ι952 49 Aeromodeller

It.A .I·'. M f i t t Mailing Model ·C lub T h e re ’s n place* fo r YO U! lute* this enterprising publicitg bill.

I SUPPOSE it had to happen, but I trust ail <>ur the finals ln*ing Croydon and Northern Heights. As I readers will have an immediate check up on their usual, the weather was unco-operativc, but both teams insurance to ensure that it is valid and up-to-date ! achieved a high standard, Croydon winning the Trophy The recent serious accident at Fairlop, when a spectator for the third time in their history. Though the Heights was struck in the face by a jet-propelled control line boys were better in rubber, the well-known Croydon model, has made a number of " insurance shirkers ” ability with gliders gave them their win, full times being wake up to the dangers of such negligence, and I can as follows:— only stress the utter stupidity of trying to dodge the C ro y d o n — issue of undertaking this very necessary safeguard. (R u b b e r) R. P a lm e r 11 : 06 J. N o r th 5 : 14 Don’t waste any time- -check up now. ft's no good (Glider) R.Gilroy 11:07 D. Yeabsley 8 : 55 saying to yourself, " Oh, it can wait until the start of N. Haights— (R u b b e r) R. G a m b lin 7 : 51 R. C o p la n d 10 : 50 the Hying season ”—you are just as liable to have a ( G lid e r) G . F e v e r 8 : 55 R. T e a s e ll 4 : 09 claim made against you whilst test Hying on that odd Bob Bcnnet of the Leicester M.A.C. takes over Sunday as at any other time. secretaryship of the MIDLAND AREA following the Who lost a Halfax Rapier model at the British resignation of Mr. C. S. Rushbrooke, the recent Λ.Ο.Μ. Championships at Digby r The Secretary of the again showing good working on the previous season, Lincoln & D.M.A.S. informs us that the fuselage of such with a substantial cash balance forward. Numerous a job has been found at l.ongwood Quarries, Blankney, successes went to the Midland Area last season, near Lincoln, and as there is an E.D. engine, Truflex culminating in Birmingham winning thb honour of prop, and Snip timer on l>oard. 1 presume the owner Champion Club by a very small margin from Croydon. will be anxious to collect! EVESHAM & D.M.A.C. are fortunate in having As a result of the ” Yorkshire Evening News " Hall)· one of the best fields in the midlands for Hying, i.o., at Shcrburn, the NORTHERN AREA are some £100 Pcrshore Aerodrome, where the local boys have been better off. and plans are already under weigh for next hosts to the Area twice during the 1951 season. The year’s event. Certain capital equipment will be main theme with this club is to fly for fun, but some purchased for the Area, which should benefit all and nevertheless manage to get very creditable times, sundry at future meetings. I note with interest that M. Bird getting into the Λ/2 Trials. this Area is another to adopt pre-entry requirements for Area contests... a practice followed in my own The WIGAN M.A.C. held its 5th annual “ Club district for some years. It is only logical to take this Comp.” on the 30th September when high winds were step, for only by this means can the comp. sec. and tlie order of the day. R. Baldwin proved to t>e Senior other organisers have any idea of the anticipated entry, Champ., and R. Chisnall took junior honours. The and cope accordingly. club has had a successful year, three meml>ers getting into the Area teams and the Championships at Digby, The final round of the LONDON AREA inter-club also good placings in the various Area events. Indoor challenge contest was flown off at Fairlop on October 21st. Thirty-two entries were originally received, meetings will commence as soon as a clubroom is necessitating a five round affair, the two clubs reaching found, members being anxious to swell their numbers. In an endeavour to promote interest throughout the PLYMOUTH M.F.G., club championships were instituted on a points basis spreading over seven rounds. / In 1950 five rounds were flown, two having to be The ‘ outsiders * cancelled on account of bad weather. Winner of the impression of a Rubber class was P. J. Ash with 147 points out of a possible 150, he also being runner-up iu the Glider model racing section with 138 points against the winner's—Mr. K. m otor ! Slocombe— 147. The power class was more open, and was finally won by a junior A. Thomas. On September 30th the Plymouth club entertained the Exeter and Torquay groups to a triangular match which went to Plymouth at the finish. During flying for the " Flight Aeromodeller 50 January, 1952

Cup ” Mr. Richards put up a flight of 4 : 47 with his spite of a nasty wind, good flying was seen at the end " Trump Card ”, only to have this club record broken of season contest staged at Lulsgate 'Drome, G. Mills a little later by Mr. Robins, who scored a maximum winning the j>owcr event with a ratio of 14 6, J. Mayes (actual time 5:13) on his third flight. did 54 secs, with a chuck glider, and D. Ramsay clocked By courtesy of a local cinema, the CRYSTAL 1 : 38 to win the rubber class. PALACE M.A.C. staged a comprehensive exhibition Plans for next year's All Herts Rally are already of model aircraft, which proved a huge success. Several under weigh, the provisional date being August 24th. new members havo been enrolled as a result of this They arc naturally hoping that this date will not again show, and with the standard of construction and flying clash with any other affair, and are all out to make improving all the time, the club is optimistic for the their ” do ” the biggest event in the calendar. October future. 14th saw a three cornered contest with the Luton and The CONGLETON M.A.C. held their third annual Icarian clubs, run in conjunction with the '* Flight rally on the 28th October, the event being well sup­ Cup ”, when St. Albans took top place in three of the ported by four neighbouring clubs. Gig Eilflander of four events, Eric Smith of Icarians being the only one Macclesfield put in the outstanding performance of the to break their progress, (Last year’s All Herts Rally day in the speed event. Flying a Class II model of his recovery service worked well. They brought back own design, and powered with one of his own P.A.W. many models during the day. but there’s many a 2 46 diesels he clocked 98*5 m.p.h. to win first place in modeller who has not removed the aerodrome phone the contest. Standard of flying in the free flight events number from his model, and the organisers arc still was also very high, and of eighty officially timed flights, getting many phone calls from all over the country. only three resulted in crack-ups in spite of a fresh wind It's not too bad until someone from up North reverses that blew throughout the day. Results :— the charges ') Power : J. Cooke (Congleton) 4 s 07 Lack of support has brought about a near demise of G. Eifflander (Macclesfield) 3 : 38 the FALCON M.A.C., chief cause probably being the E. C lu tto n (Five Towns) 2 :SS ill health of the chief organiser cum club secretary. Glider : N. Bradford (C h e a d le ) 5 129 Mr. Brown would now like to contact the members J. Sharpies (C h e a d le ) 4 : 41 G . R o b e rts (Five Towns) 4 : 34 once more with a view to reviving the club, so what about it lads ? Address is Λ. Brown, 4, Sclston Road, After an enjoyable season's flying, the members of Jacksdale, Notts. the STREATHAM & D.M.A.C. held their annual club contest on Epsom Downs when, despite lack of Who said CHINGFORD M.F.C. are a model flying lift, times were good and the glider boys proved club ? A few weeks ago " some clot " took a microfilm victorious. In spite of the calm conditions, Churchcr job along ; now there are flimsies floating around in towed his nine-footer into first place with an aggregate dozens, and the bods that do not fly such machines of 10 : 41. followed by D. Swale 9 :1 1 and K. Morgan have to sit around the canteen because the fliers arc- 8 : 57. Indoor flying, with the accent on r.t.p.. is afraid they will knock tile models out of the air I At starting again with comps, for paper covered jobs every floor level, Jctcx-powcred cars and an electric r.t.p. Friday at 8.15 p.m., and there is a rumour that certain car are causing risks to ankles and anything that lands members are thinking of regaining Iheir former records in their path, so things are lively down Ciungford way I ! now that interest is being revived. The contest season being over, the LANARK M.F.C. Ix>cal modellers are asked to note that meetings of the is getting down to an intensive construction programme, LAMBETH M.F.C. now take place on Friday and winter activities will include an inter-club contest evenings instead of Mondays. Venue is still the with the Motherwell M.F.C. and film shows. Free Bcaufoy Institute, Black Prince Road, S.E.ll. where flight Power has proved the most popular class, and a there is full use of metal and woodwork shops, play­ number of club records have been broken. A. Taylor ground and hall. made a ratio of 43 7 whilst the duration record of 8 : 17 is held by A. Wallace. A junior member has the credit The BRIGHTON M.F.C. followed up its fourth for a time of 15 : 00 o.o.s. with a glider, this being an place in the " M.E. C up" by winning the club improvement on a 13-minute flip by the same model. championship at the S.E. Rally with an aggregate of At the club's recent gala, a strong” wind made flying 32 : 04 out of a possible 45 : 00. F. H. Boxall was top difficult and the flight times of the top three in each man in the glider contest, one flight being a maximum class are evidence of this. Results :— in a heavy shower ! He has also produced liis 1952 Power ratio : J. McMaster (P a isle y) 23-31 Wakefield- -an American influenced “ longer and G . B la ir (Edinburgh) 2167 lighter ” model which is averaging 3 : 45 in evening air. R. H. Murdoch (G la sg o w ) 15 03 Things seem to be improving in the SOUTH Open Glider : T . C la rk (G la sg o w ) 4 : 49 V . W a n n o p (Bucksburn) 3 : 43 BRISTOL M.A.C., many members turning up on W . McConnachie (G la s g o w ) 2 : 35 Sundays for a spot of flying- -those without models busy telling those with the best way to fly ’em I In The comp. sec. of the SOUTHERN CROSS M.A.C. has had a busy time getting out the statistics for the 1951 season, the clubs most successful and busiest. Senior Champ, proved to be Grahamc Gates, an aeronautical stressman by profession, who started I altered the the season well by winning the Pilcher Cup~-followcd by Bill Gravett, now known as the man who had the compression Lady Shelley Cup ! Many of the club's records have a little for easier been brokeu recently ; K. Donald now holds the A/2 starting ! ILL. record of 2 : 44, and the tow launch figure goes to Bill Gravett. M. Bristow put up the Class Λ light­ weight power duration record to 7 : 07, and the club is Eleased to hold a British Record, that of 5 : 18 put up y Grahamc Gates with his 12-it. span sailplane. J a n u a r y , i g j 2 5 1 Aeromodeller

First club report from the WELLINGBOROUGH M.A.C. reports an inter-club contest staged with the Northampton boys. Leicester were invited, but the notice was too short, though support is promised for next year. Arrangements were helped by the finest flying day for months, and some good flying resulted, as follows :— P o w e r i P. S n o d in (Northampton) 4 : 58 B. B a ile y (W ellingborough) 4 : 42 C. Longstaff d o . 3 : SO G lid e r > P. W ic k s (Northampton) 4 : 23 At the end of the 1951 season, the REGENTS P. W ilk in s o n d o . 5 : 00 PARK M .F.C. are pleased to report that five “ A ” B. B a ile y (W ellingborough) 4 : 21 and two " B ” Merit Certificates have been gained by R u b b e r : T . O u n k le y (Northampton) 5 : 31 H. W . Revell d o . 5 : 04 their members, four of these being juniors. This C / L S tu n t B. R avine (W ellingborough) 177 p o in ts proves that a little time spent on the junior element C. Boddington do. 140 pays dividends ! It was noticed that several times K. W a r d d o . 142 during the year juniors did not turn up because they Another club to make its first appearance in Club could not afford a new rubl>cr motor or some other News is the HENLEV M.A.C. with results of their article, so a Savings Bank has been started where 1951 contest. The Aston Challenge Shield for rubber- members pay in any odd coppers they can spare, and powered model was won by K. F. Sandy, with A. W M. draw out any time they require a new motor, etc. The Cooke a close second—both flying Wakefields. Club idea was greeted with great enthusiasm—and not by Sec. J. G. Waldron won the glider class with his o.d. the juniors alone ! 10-footcr, and power honours went to Mr. Cook. Following a control-line demonstration at the local Membership has fallen to a mere dozen, with four more Drill Hall, practically every model owned by the in the Forces, but all are dead keen types and eagerly OLDHAM & D.M.A.C. is out of action ! Models got awaiting the 1952 season when they hope to better hung up in the rafters, jobs dropping out into the middle even their 1951 record. of team racing, etc., and a hectic time was had by all. Scale flying and speed (the latter on 30 ft. lines) rounded Faced with an ever decreasing flying field, owing to off the show, the speed job reaching 70 m.p.h. and the encroachment of housing estates, interest of the leaving the flier proper spin-dizzy. The club under­ CHEADLE & D.M.A.S. is turning to team-racing. stands that other groups have put on similar demon­ Held at Tilstock on October 14th the club champion­ strations and made them pay- -suggestions and advice ships were blessed with perfect weather, a new 56-inch will be welcomed. span Nordic club design sweeping the board. I . Harrison won the rubber event with a fairly standard type With two members already successful, members of Wakefield, getting flights of 3 : 20, 3 : 41 and 2 : 40, but the ISLE OF ΤΗΛΝΕΤ M.A.C. arc going to have a W. Nield eclipsed these times with two maxiinums and crack at obtaining their Class A Merit Certificates. a 2 : 07 in the glider class. A new glider record was set J. Devereaux, J. Martin and H. Barker were successful up by N. Bradford, flying a modified " Walthcw ” for in the club’s end of season comps, for the Club Trophies, 15 : 00. and a new club power duration record has been set up by junior member W. J. McEvoy’s Elfin-powered job, For the second year in succession the SHEFFIELD time being 3 : 23*7 from a 10-second engine run. S.A.M. have won the coveted Rootc’s Trophy, this rounding off a very successful season. Club Champion The Club Championship Cup of the SOLIHULL for 1951 is W. Nelson, with last year’s champ. G. H. M.F.C. has been won by Maurice Hanson, scorirg Wilkins as runner-up. Junior champ, is K. Emmett. being on a points system throughout the year. An extensive programme of indoor interests has been Successes have been gained in the final National drawn up, and any club wishing to attend will be very contests, and Ken Lloyd proved to be top man at the welcome. last Area Rally at Loughlwrough with a first in rubber and second in glider. WHITEFIELD M.A.C. report the highlight of the ast month as H. O’Donnell’s winning of the " Frog Ancnt my remarks on clubs who hibernate through unior Cup ” with the only treble maximum to be the winter months, the SLOUGH M.A.C. have sent secured during the whole of the national programme in in a list of their future activities. They will definitely 1961. He capped this three maximums with a 12 : 23 not go rusty, for a full list of various activities will take just to round matters off ! Good times were made in some getting through. the “ Flight C up”, J. O’Donnell scoring 12 : 10, 1951 was the most successful season of the FO R­ followed by A. Wrigley with II : 05, both flying ESTERS (N ottingham ) M .F.C., to which the use diamond pylon Wakefields. Ten-year-old Wendy of Tollcrton Aerodrome, with its clubhouse facilities Bennett clocked 10 : 40 with a “ Raff V' ", whilst her has largely contributed. In the competition sphere brother aggregated 9 : 38 with a replica of Stark's the best achievement was second place in the Taplin Wakefield. The club visited the Five Towns M.A.C. Trophy by Jim Weston and Duggie Bolton ; Mike open day and were met with a 30 m.p.h. wind and Crawforth placed second in the Midland Area Rally continuous rain all day ! H. O'D won the rubber event Class A team race event—in spite of an overheating with a three-flight aggregate of 2 : 42 flying a light­ engine ; and at Pershore the club did reasonably well weight. closely followed by A. Wrigley who had the in the glider event. In spite of this, one member (who misfortune to wreck his Wakefield on the third flight. shall be nameless) left his model so long in its coffin With four clubs now in existence it seems that that it was covered in mildew ! Northern Ireland can become an S.M.A.E. Area. The We arc advised of an incorrect statement that BELFAST M .F.C. report plenty of Wakefields and appeared in our last issue in connection with the Nordics under construction, and it is hoped to send a Northern Area knock-out competition. It appears really strong team for the U.K. Championships in 1952. that our informant got his figures crossed, for the comp. Aeromodeller 52 January, 1952

sec. of the HALIFAX M.A.C. reports that it was in NEW CLU11S fact his club that won this closely contested affair ! ILMIN8TER & D.M.A.O. The surprising part of this contest was that on the first A. It. Pepplt. 10, lllnckdown View, Ilminuter, Somerset·. meeting on October 21st both teams scored 11 : 50- · R .A.F. DALCROSS M.A.C. Hon. See., S et. Uanulgan, Sgts. Mcstf, 8 A .F .T .9., It.A .F. thin at Baildon a week later both tied again with M crog». LnvernoRs. 19 : 50. Almost impossible you’ll say. but true never­ WEST H ARTLEPOOL & D.M.A.O. theless. Representatives from each club then flew off Miss .1. Kingston. 2.1, Torquay Avenue, OwLon Manor. West Hartlepool. Co. Durham. the decider, and David Haley of Halifax scored 3 : 25 W EST BIRMINGHAM M.A.C. against York’s Ron Firth, who could only manage C. Harris. 112. World’s End Lone, Quinton, Birmingham. 2 : 24, thus giving Halifax the win by only 1:01. Pity W R E K iN COLLEGE M.O. W. B. Marlev, Norman House. Wreklii College, Woffington. all such comps cannot be so exciting ! Salop. The CLUBMAN. SECRETARIAL CHANGES Ν.Ν.Λ.Κ. ('oiliest lte«iilt« SEATON (Devon) M.F.C. FLIGHT CUP L. W. G. Notheott. 28, Fore Street, Seaton, Devon. 1. D u b o ry , V . R. (Leeds) 14 i 12 OUTLAW S (Cannock) M.A.C. 2. Knight, J. B (Kentish Nomads) 13 i 51 It. Harper. Dirt, Stafford Road, Cannock. Staff*. 3. R o yle , J. (Littleover) 13 : 47 W OLVES M.A.C. 4. G o rh a m . J. A. (Ip s w ic h ) 13 : 40 J. 8. Richmond. 151. liushbury Road. Wolverhampton. 5. P a lm e r, J. (C ro y d o n ) 13 : 30 ROCHDALE Sc 1).M.F.C. 6. S m ith , E. (Ic a ria n s ) 12 : 31 W. Llnguard, 2. Warren Street, Rochdale, banco. ZOMBIES M.A.C. FROG JUNIOR CUP It. 11. Warring. 10a. Hoync Road. Beckenham. Kent. 1. O’Donnell, H. (Whitefield;. IS : 00 DEI FO RD M.A.C. 2. K e ile y , W . (Regents Park) 12 : 18 R. A. Daniels, M.O.S, .Station, Defford, Wore». 3. M a rs h , C. ( Ilfo rd ) 12 : 12 EDMONTON A.C. 4. Farrancc, K. (West Yorks) I I : 25 A. W. Dance, Sfifl. Hertford Road. Lower Edmonton, N.9. 5. F a rra n c e , B. (W est Yorks.) 1 1 :0 3 ESTUARY POWER MODELLERS. 6. Rumley, D. H. (Kentish Nomads) I I : 00 G. Medhurst, 10, Hylands Road. Southchurch, Southend- HAMLEY TROPHY on-Sea. Collins, E. (Port Talbot) 14 : 17 GLASGOW M.A.C. 2. Buskcll. P. (S u rb ito n ) 13 : 27 It. F. K. Taylor, 2, Hfflkirk Street. Sprinirbuni. 1. Averill, R. (S o lih u ll) 13 : 18 Glasgow, N. 4. B y r d .G . (Loughborough Coll.) 12 : 31 CR AN WELL A PPRENTIC ES M.A.C. S. W y a tt. P. (Ip s w ic h ) I I : 54 580811 A. \. Newman. K Fliftht, O Squadron. Block 125. 6. Spraton, E. (S o lih u ll) I I :4S Λρρβ Wing. R.A.F. Ornnwcll, Lines.

T II K F . A . 1 It I] I» O It T N presenting the accompanying report of the F.A.I. questionnaire on the subject of international and world meeting at Brussels, we do so in the knowledge that records, and we have no doubt the Council of the itI will greatly interest the many hundreds of aero- S.M.A.F.. will strongly recommend the imj>osition of a modellers in this country who are keen competition standard 20-second motor run for all power classes. fans, and at the same time those who whilst not It has long been apparent that the Wakefield rules, necessarily competition minded are nevertheless amended and modified as they have been from time to influenced in their flying by the various rules and time, now require a thorough vetting to bring them regulations introduced into the hobby from time to fully into line with International requirements. We time. understand . a special sub committee is currently It is gratifying to note that the F.A.I. Models considering this very important requirement. Commission is demonstrating a better approach to the subject these days, for much of the criticism levelled Item 17 is of interest, particularly in view of the in the past has been that they seemed to have little present indecisive state of officials timing in this appreciation of the modeller’s real requirements. country, and it will be interesting to see in wha. form anti manner the list of official Timekeepers for Great As stated in an earlier editorial, we are of the opinion Britain is prepared. This will, we hope, 1h; the thin that the sooner our National rules are brought more end of the wedge by the S.M.A.E. to bring this very into line with those in the International Code the better, vexed question under proper discussion, for we regret for we have seen it clearly demonstrated at various to say that the general standard of timekeeping in thus meetings, both at home and abroad, that individuals country leaves a lot to be desired. In our opinion a can become sorely perplexed and indeed handicapped first-class timekeeper should be able to operate and -when operating under a code of regulations with read a chronometer properly, be fully conversant with which they are not familiar. the requirements of all classes of contest, and be One very vital modification to earlier rules is that strong-minded enough to rej>ort breaches of regulations mentioned in (9). for the old regulation relative to the and to further ignore remarks of overkccn bystanders maximum weight of model has been amended and the whilst undertaking his duties. The possession of good new requirements arc much more reasonable. eyesight is hardly necessary to mention ! We particularly welcome the unification of conditions The new Code Sport if and Annex set things out very for contest and merit certificates, and strongly uphold explicitly, but unfortunately is far too extensive to the opinion that it is time world records came in for a comment upon in detail. An improvement we would general reshuffle. We in this country are severely like to see is in regard to the characteristics of model handicapped when it comes to making unlimited engine aircraft for the Championship classes, for whilst a run flights, and we are certain that a much better indi­ complete specification is given for the rubber driven cation of model ability will become apparent at such class (Wakefield) and gliders (A/2), models with time as a series of records using the 20 second maximum mechanical motors are limited solely to an upper run are instituted. The F.A.I. are putting out a cylinder capacity limit of 2*5 c.c. and a minimum J a n u a r y , 19 5 2 53 Aeromodeller weight <>f 200 grammes per c.c. We feel it would be and then allow a competitor a further attempt if he much better were definite surface areas to be laid down exceeds this time. Surely if the breaking of a glider as in the other two-classes. line is the responsibility of the competitor, the proper Our one other criticism is relative to the definition regulation of an engine run comes under the same of an attem pt (false start) ; in our opinion it is am­ category ! We would like to hear our readers’ opinions biguous to fix a maximum engine run of 20 seconds on this particular point. ★ i i m i t v n o v Λ Κ ΐιοχΛ ΐ T iQ tι<: ι \ τ ε ι γ \ λ τ ι ο \ λ i ,e Commision Internationale des \1 adrift Rrduits. Report oi Meeting held at Brussel*, June 5th and flth, 1951. Delegate* p re s e n t: — Belgium proposed that the method of releasing a rubber-driven A . 1'. H o u lb crg (President), A. Degen, Switzerland. model be changed and replaced by the propeller ami wing-tip United Kingdom. J. Guillcmard, France. rule. T here were objections to Ibis : one being that with light G. D rrantx (Vice-President), A. HcUemans, Belgium. and fragile models it may cause damage ami it was decided to Sweden. A. Roussel, Belgium. leave Article 4.2 a* it stands. J. van llattum (Secretary), The Belgian proposal that in international championship con­ Netherlands. tests one of two timekeepers should l»e of a different nationality than the organising country was adopted as a strong recom­ 1. Immediately prior to the meeting proposals were received from mendation. The difficulty of ensuring the presence of suitable the Academy of Model Aeronautics of the United States ami timekeepers on all occasions make* insistence impossible how ­ from the Danish Royal Aero Club indicating their views concern­ ever. ing various points arising from the present regulations. 15. It was also recommended that in contral-line flying one of the 2. The minutes of the meetings held at Stockholm and Brussels three judges should be of a different nationality. during 1950 were approved as published without amendment. 16. The Belgian proposals to correct Articles 1.1.3. and 1.1.2. by 3. The secretary read his report of the activities of the Commission the inclusion Of ‘ Ar.C.N. " were adopted. during the past year which was approved and w ill be published 17. The attention of national aero clubs is drawn to the fact that the as a separate document. new Codc-Sportif calls for a list of official timekeepers and 4. It is hoped that national aero clubs will give more attention to judges from the clubs. Compbancc with this request w ill greatly the points raised in this during the coming year, particularly in facilitate the organisation of international contest*. view of the present rapid growth of the hmhIcI aeroplane move­ m ent. 13. The proposal from Denmark that control-line model certificate* should be established was again considered. It is the opinion of 6. The chief work of the Commision this year has been the pre the Commision that in the case of certificates issued for aerobatic paration of the Coit-Sporlif de ΓAeromodelisme. It ha* been performances the quality of the manoeuvres should not be taken evident for some time that the General Code-Sportil of the into consideration ; the only requirement being that the P.A.I. was not applicable to models in many instances, and that applicant should have executed them. As the certificates for many special features concerning models were not dealt with at the various classes of models recognised by the F.A.I. are a ll. interrelated, the subject was considered too involved for dis­ 0. A separate Codc-Sportif for Aeroinodeb has therefore been cussion at this meeting. Mr. van llattum was charged, therefore, prepared together with an “ Annex ” dealing with the control with the study of this matter ami asked to prepare a report for and organisation of model aircraft sporting events, which should the next meeting of the committee. It was decided that this place the conduct of contests on a sounder basis. meeting w ill take place at T he Hague on December Sth ami 9th, 7. In the course of this, one important point dismissed was Article 1951. 2.2.3 of the Code dealing with the lime period of the notices of 19. Britain proposal that Olympic meetings shall be held where all events which national aero clubs must give to the F.A.I. and lour World's Championships are flown. For various practical other national aero clubs. At the moment it stands at one reasons, such as the time a full stall must be in attendance ami month in the ** Codc-Sportif General " and we find this period the difficulty for countries far away from the place of the contest far too short to enable an aero club to organise and send a team to travel with a large team, the proposal was not adopted. A at such short notice. The C.I.M.E. would like to extend the vote showed that there were four in favour and five against. period to three months, as decided in Stockholm, for models 20. As a result o( a Belgian proposal, the limits of line lengths for and it is thought that the present time period in the “ Code- control-line aerobatics are changed to 15 metres minimum ami Sportif General " must also be too short lor the other committees. 20 metres maximum. 3. Article 2.2.3. 4d. It was decided in Geneva iu 1943 that no cash 21. Ttie Belgian proposal to lim it the engine size for model» in frre- prizes should be given. The text is amended by introducing the flight to 5 c.c. was considered to be worthy of further study in word “ or their value ”, In the same article (/) the word view of modem developments. “ application *’ in the English text is changed to " entries **. The French text was considered correct. 22. A Swiss proposal to use the best speed of three flight* to deter­ 9. The use o f reaction models has already been restricted to control- mine the placing of models in speed contests was adopted. line living and recent experience has indicated that the method originally adopted to lunil their possible size and weight is A nnex to the Code Spot it/ de I'Aeromodelisme. capable of improvement. As suggested by tlie Λ.Μ.Α., Article 23. Various corrections and changes were discussed and adopted and 3.8.5. concerning the rule that tnc " total weight of the model w ill be found in a new text to bo published shortly. must not be less than four times the weight of the re action m otor ” has been amended and the maximum total weight of the 24. A new ruling has been established defining attempted flights in model has now been fixed at 1 kg. The maximum weight of the contest.» a» the previous definition ha* not been considered re-action motor remaining at 500 grammes. satisfactory lot some time past. 10. In order to unify the conditions for certificates and contests the 25. It was deckled that in international aerobatic control line lim it placed on the motor run in Article 5.3. lias been fixed at contests, the flight is ended when the competitor has landed his 20 seconds making the conditions identical for both. For model. A re-start is not ‘allowed and the time lim it allowed for records the motor run is still unlimited although it is the general completing the manoeuvres is abolished. opinion of the Commision that the time has come for the imposition of a lim it in the case of records. Election of Hureatt. 11. This, however, raises the point that the whole of the list of The new Bureau is composed as follows r - records are in need of revision m view of developments in recent A. F. Houlberg, President (Great Britain). years and it was decided to ask the co-operation of the national G. Dcrantz, Vice-President (Sweden). aero clubs in establishing a revised list for the proposed December J. Guillcmard, Sccrctapt (France). meeting of the C.I.M.E. through the medium of a questionnaire. A. Roussel, Assistant-Secretary (Belgium). 12. Belgium had proposed re considering the introduction of the 26. In conclusion the President on behalf of the Commision expressed ratio-method for judging model* in power contests, but it was its sincere thanks to Mr. Gillinan, the general secretary, for the pointed Out that the subj.. i lulu dealt With in Stockholm tremendous amount of work he has carried out for the committee and such results are unreliable. (See Doc. ΜΚΛ50/9.) A and to Mr. Guillcmard, the new secretary of the committee, for discussion on the present Wakefield Rules shows that they are good work he has done on the new Code-Sportif and its Annexe not fully correspondent with the F.A.I. rules. The President Many thanks were also due to Mr. van Hattum, the secretary of explained that they have bccu amended and the alterations the committee for 1950, who had carried cut some valuable work nude known in Finland. for the committee during his term o( office. Aeromodeller 54 J a n u a r y , ig 5 2

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KKSinn iM ilttl i f kk *»>*«i# it)· .τ» xr isooi ir ’ ho» SumS^i >Γ KKHk^SfM· <»>♦’« »>q| K’.kl. Η’ V.fen M ^ » : Oil i r KK rut W Vw> r.w | «η SIAM R ACTUS tm Vtr*tf 11 CKn *· «·*»·»·»») KK s.^1 iV r·.». (c u - at rr«. kk a* ·* t .n .« A) i i i j »'<*KK Λ."Λ.*4· u—n < U m v r ML I ;CUm Al . I?* U iO ill· W V*m MD»< Μ νιηιΐΠ ΐΗ All* 1 w i.. m.->k»wi'Ow> a· . :·« KKUotwa^n \«ι >ί WmIuucmiImi ΛΙ . IS< I" Ιμ»<ιΛ taiwu —r ·**«..

As M ercury and Frog agents As K t ilk raft stock ins we we hold good stocks of can supply all K .K . k its and these firm s products and accessories. If it's K .K . we can supply most items from have it. so watch the K.K. stock. Raylite are 100% ad. and send to Raylite. Model Aircraft Suppliers and as such, deliver tho Send SΛ.£. for Keilkraft's goods. All orders dis­ latest list. patched per return post.

K.K'·. 3 8 Range :—Globe Swift. Erco Ercoupe. Percival. Chipmunk. Piper Super Cruiser, Fairy 17. Cessna. Stinson. Luscombe K.K. Bandit. 22 · . K .K . Junior 60. 48 3. Silvaire. Fokker 0 .8 , Beechcraft Bonanza. K.K. Ladybird. 22 8. K.K. Outlaw, 27/4. W e regret, due to increased postage and K.K. Slicker Mite. H /7 . K.K. Pirate. 14.8. packing costs we are compelled lor the first Frog Firefly. 22/4. Frog Strato. D.. 15/- time to charge nominal postage as follows Frog Fox. 2 1 /— fro g Janus. 17/4. Frog AUSTER ARROW 3/8 All orders under S/-, id. ; I·/-. 9d., and Powavan. 25/4. Frog Vixen. 15/— Mercury above I · / - , I / — O rders o ver £1 are stiH Junior Mallard. 12/7. Mercury Monocoupe «0. CONTROL LINE p o s t free. 24/7. M ercury Stinson 105. 24 7. Mercury Chrislea Sky Jeep. 24 7. K.K. Phantom Mite, 14/1. K.K. Phantom. 22/8. K.K. Stunt King. 22 8. K.K. Stunt Queen, 25 8. K.K. Skystreak 26. 11/7. D . C. 3SO. £3 -4.8. Frog 500. £3-15-0. Elfin Veron Midget Mustang. 25/8. Veron Phil·- I 49. £2-19*4. Elfin 2-49. £3-10-0. M ills -75. b u tte r. 23/4. M ercury Mk. I Team Racer. £3-0-9. M ills I 3. £4-11-1. E.D. Bee. £2-12-4. K.K. Playboy. 4/-. K.K. Achilles. 4/11. 22/4. Veron Spitfire. 33/4. Frog Vandiver. E. D. M k. Ill Series II, £3-12-4. E.D. Mk. IV.. K.K. Eaglet. 5/4. K.X Ajax. 7/4. K.K. 15/-. K.K. Ranger. 12/10. Veron F.W. 190. £3-15-0. Eta 19. £4 ^-5 . Frog 150. £2-9-6. Acc. 4/1. K.K. Competitor. 8/7. K.K. 24/-. Mercury Musketeer. 24/9. Mercury Frog 250. £3-12-4. Senator. 4/9. K.K. Gypsy. 12/10. K.K. Junior Monitor, 17/5. Mercury Junior Pixie. 4/11. Mercury Maybug. 7/4. Veron Musketeer, 20/10. Mercury Midge. 6/5. Rascal. 4/4 . Frog Stardust. 12/9. Frog Vanflre. 29/4.

LTD. · 21 ARKWRIGHT STREET, NOTTINGHAM TELEPHONE : 89216

. · · not just because the Mills saves you money from the moment you buy it ; though to-day the economic P.75 c.c. 60 9 S.75 c.c. 66 9 advantage of this trouble-free engine is reason enough for 1.3 c.c. 99/1 Throttle 8 3 the steadily growing demand. The Mills, being built to Inc. Tax. last, also offers longer service at peak performance . . . with quick and easier starting to give you more flights per hour. Wherever there's Jloilul Jhiinii ιμιιι will fin ti II»; .H i l l s

Australia : Model Aircraft», I Bond Street, Sydney. New Zealand : Collinson & Son Ltd., The Square, Palmerston North. Argentina : G.S. King-Prime. Reconquista 692, Buenos Aires. South Africa : A. W. Yardley Ltd., P.O. Box 814, Johannesburg. C h in a : Eastern M odel Airplane Co., Nathan Road. K ow loon, Hong Kong. Jack Lemkus Ltd., 49A St. Georges Street, Capetown. India : Traders & Distributors Corp., I2B Park Street, Calcutta. Kenya : Model Engineering (East Africa), York Streot, Nairobi. Swoden : Eskader, Gumshornsgatan 8, Stockholm. M a la ya : Robinson & C o.. Raffles Place. Singapore. U.S.A. : Polk's Model Craft Hobbies, 3l4„Fifth^Avenue. New York.

MILLS BROS.(™L,,) LTD 143 GOLDSWORTH ROAD · WOKING · SURREY

Kindly mention AEKOMODELLH7t trhen replying to advertisers Aeromodeller January, igg2 1 0 'BUYS3I'6B00K

GENUINE OFFER! ALL YOU PAY FOR DELUXE EDITION & FREE GIFT!

• T H IS B O O K published at 31 6 is beautifully bound in blue buckram cloth with gold foil titles. Printed on white art paper with over 150 photo-pictures and 80super 3-view aircraft drawings, '^ s v/***'*^ \ many opening to 2 or 3 pages ||\ (sire 23' *· I r ). Each book r contains about 300 pages ( I I '. · 8$'), weighs over 2 | lbs., and has approx. 100,000 words of text—weeks of exciting reading ! φ THE CONTENTS will thrill every British reader with descriptions of British. Allied and Enemy Bombers. Fighters, Reconnaissance and Naval Aircraft that defended us, attacked in their turn, or prepared the way for saturation raids. Needs no technical knowledge to enjoy. φ Y O U R FREE G IFT— 16 grand full colour plates (I Iy x 8 ^') ofW o rld Wars I and II Aircraft in Dogfights, Bombing or other historic scenes. Wonderful decorations for your den or a permanent record in book form. Published at O ne Guinea now FREE TO YOU w ith all orders. Send name and address with 10/- note to-day for Post Free by Return Delivery. DEPT E.B.S. The Aerodrome, Billington Rd., Stanbridge, N r. Leighton Buzzard, Beds.

Compare the Price / / r s / t ψ with any other make of engine!

D.C. 350 M k.ll. D.C. 35 (G)

(DIESEL) 3*5 c.c. GP engine EXPORT (INCLUDING AGENTS £3.6 .8 TAX) BUTLER. £3.5 .0 ROBERTS & CO. «. Draper’s Garde ns. London. E.C.2-

Quality, ~Perjormance amI Service llnecjuatled η i v ■ i . € ■■ i ic ■ i o % & c o RAINHALL ROAD, BARNOLDSWICK via COLNE, LANCS. Tel. : Barnoldswick 3310

Hhnlltf mention .1 HHILLEH when tvplyiny to advertitiers Ja n u a ry , ig $ 2 57 Aeromodeller

H o r l h E o l i t h ■ efe«et OVERSEAS CUSTOMERS We despatch to al‘ part, of the world direct to you. Goods can be sent C.O.D. if your country under­ takes the service, otherwise sond mm monoy order, cheque, postal notes M - i m c i : ■ i i f a* advised by your postal officials. YOU DO NOT PAY ENGINES CONTROL LINE KITS PURCHASE TAX W ith present conditions beginning ( S T U N T ) P.T. NEW VERON CARDINAL to bring shortages back to the acro- K.K. Skystreak. 26* 9/6+ 2/1 Another food value kit by Veron. Span 3 5 ' and designed (o r the small modelling trade, the large stock we K.K. Skystreak. 40* 10/6 2/4 X ACTO TOOLS hold is your safeguard. Only those K.K. Stunt King. 36 18/6 + 4/2 m o to r. -5 c.c. to I c.c. Ready engines actually in stock at the K.K. Stunt Queen. 41* 21 0 + 4 8 cut-out ribs, sorbo rubber wheels, N o . 84. T ool Chest. 64 0 ; N o. 82. insertion of this advertisement are Veron Panther, 4 Γ 25 0 + 5 /6 ready-cut sides, ample printed T ool Chest. 30 0 ; N o. 78. W ood advertised. P.T. Veron Boo-Bug, 22* 12/0-4 2 8 w ood, d e a r plan w ith E.D. Bee Carving Set (illustrated). 37/4 : Allbon Arrow 55/0 4- nil Mercury Musketeer, 40* 20/3 · 4 6 mounting details. Ideal for first No. 77, Wood Carving Set 23/0 : D. C.350 S3'4 f-13/4 Frog Vanflre, 4 0 ' 24. 2 + 5/4 pow er m odel. 14/4 + 3/2 P.T. No. I, Knife (with No. II blade). E. D. Bee 4 2 /0 + 1 0 /4 Mercury Monitor, 39' 16/3+4/1 3/0 ; No. 2. Knife (with No. 22 58/0 + 14/6 FREE FLIGHT FLYING SCALE E.D. III. Ser. II FREE FLIGHT FLYING SCALE blade), 3 /4 : N o . 5. Knife (w ith N o. E.D. Mk. IV 3 46 4 0/0 + 15/0 B Y M E R C U R Y 19 blade). 4, 6 : N o. 51. Knife Set 4 7 /4 + 1 2 /0 BY KEILKRAFT Elfin 1-49 The Piper Super Cruiser (below) is P.T. (No. I knife and 6 blades), 5/6 ; 9 2 /0 + 2 3 /0 Stinson I0S Voyager. 42*21 /9 f-4 'ΊΟ N o . 52, Knife Set (N o . 2 knife and Am co B.B. 3-5 one o f three Super Scale Free Flight 4 0 /4 + 9 /0 Chrislea Sky leop. 40” 21/9+4/10 4 blades), 4 /9 ; N o . 62, Knife Set Frog I50D Power Kits containing moulded M ills P.7S 50/0+ 10'9 Monocoupe. 40’ 21/9+4/10 (N o . I and 2 knives w ith 12 assorted plastic engine cowling, crash-proof M ills S.75 5 5 / 0 + 11/9 Monocoupe, 64’ . 54/0+ li/0 blades), 12/3. Spare Blades avail­ 7 5 /0 + 1 6 /1 one-piece wings and usual Keil M ills 13 M k. II value for money. Other kits are able. Sond S.A.E. fe r illustrated E.T.A. 19 G.P. 99/4+24/11 TEAM RACERS P.T. X-Acto leaflet. Cessna 170 and Luscombo Silva ire. K.K. Ranger A 10/4 + 2/4 A LL O N E PRICE— 18/4 4-4/2 P.T. K.K. Scout B 22/4 + 5/0 FREE FLIGHT POWER KITS Veron Minibuster A 15 0+3/4 P.T. 25 0 + 5/6 V eron P hilibustcr B23/6 + 5/2 Veron Skyskooter, 48' Mercury Mk. I B 18/3 + 4/1 2 1 /0 + 4 /6 Frog Cirrus, 48* M ercury Mk. II A 14/3 + 3/3 Frog Fox, 40* 1 7 /2 + 3 /1 0 Frog Vixen. 36" 1 2 /4 + 2 /8 M ercury M allard. 48* 1 8 /3 + 4/1 Postal Instructions, — In and Order value under K.K. Junior *' 60 ” 4 0 /0 + 8 /1 1 15/-, add 9d.: 25/-. add 6d.; K.K. Ladybird. 41* 18 6 | 4 .’ over, post free. K .K . O u tla w . 50* Oversees ^ — A ccording to K.K. Pirate. 34* 12/ 0 + 2 /8 postal servico requested and destination. Apply (or details of overseas I*. E . Iiiri^ o ry «& Son (A lton) L td . Fuel Desoatch. SEND FOR LISTS. JUST A L T O N . . ™ : A l t o n 8376 . . HANTS. O U T .— S.A.E.

Overseas customers can have confidence that, because o f our varied experience with the Balsa wood in many industries, they will obtain the best possible selection in every trade by using Solarbo. This is only one of many reasons for our success in 22 overseas countries.

SUPPLIED TO WHOLESALERS AND MANUFACTURERS ONLY

lei : LANCING 2090-2099.PLANTATION WOOD(Lancing) LTD,COMMERCE WAY. LANCING.SUSSEX Grams: SOLARBO WORTHING

Kindly mention AJEROJtODELLEIl irhen replying to advertisers Aeromodeller 58 J a n u a r y , 1 9 5 2 R .S . FOR RETURN SERVICE FIRST * * * SECOND-HAND ENGINES* * * MY OWN POST OFFICE DEALS WITH ALL I always have at least 50 different second-hand MAIL PROMPTLY A N D EFFICIENTLY engines to choose from. All carry my money- A G A IN ! back guarantee. * * + CASH ON DELIVERY * * * OK Cubs. 049—074—099 cu. in. 50/- Many modellers find it oasier to pay the postman The New Frog 160’s. 1-6 c.c. G low plug 12/6 on receipt ofgoodt. Just list your requirement» Frog ISO’s. 1-6 c.c. Diesel 17/6 and ask for C.O.D. Service. I will do the rest. ELFIN SO M ills 13 c.c. M k. U s. Diesel 42/6 Allbon Arrow*. I S c.c. Glowplug 35/- * * * STOCK LISTS * * * Elfin 249's, Radial Mount . 42/6 I am now distributing my New Stodc Lists. •S C.C. E.D. C om p. Specials. 2 c.c. D ioscl 31/6 If you havon’t got yours— send a large S.A.E. Am co 3-S’s, Diesel...... S7/6 today. DIESEL Am co 3-S’s, Redhead G low plug . 47 6 * * * HIRE PURCHASE * * * Supplies of this long-awaited masterpiece are Mills 2·48'ι. Diesel...... 47/6 Yulon 29's, S c.c. Glowplug 47/6 All goods value £2 or over are available on my at last available. See Elfin advert, for details. self financed Hiro Purchase terms. Send for Price 47 6 Vulture 5 c.c. Diesel 35/- McCoy I9’s. 3-2 c.c Glowplug 45/- full lists and simplified Agreement Form. * * * NEW ENGINES * * * M cCoy I9 ’s. Redhead M odel 75.''- * * * BOLTON MODELLERS * * * A llbon D a rt, -5 c.c. Diosel 65/2 Micron 10 c.c. Racing Engine 190/— M ills P.75. -75 c.c. Diesel 40 9 My shop at 397, Chorley Old Road will be E.D. Bee. 1 c.c. Diesel 52,6 * * * SECOND-HAND 'RADIO * * * happy to serve you with all your modelling Elfln 149. 1-49 c.c. Diesel 59/6 E.C.C. 2 valve Receiver ...... 4 0 /- requirements. Frog 150. 1-5 c.c. Diesel 49 4 E.D. Mk. Ill Receiver ...... 5 5 '- * * * OVERSEAS CUSTOMERS * * * Elfin 249, 2 49 c.c. Diesel 7 0 /- Teletrol Miniature Transmitter 40/— I supply all goods to Overseas Customers free E.D. 246 Racer. 2-46 c.c. 72/6 * * * NEW KITS * * * o f P urchase T a x . A irm a il Postage Rates are E.D. M k. IV. 3 46 c.c. Diesel . 7 5 /- K .K . Pacer. Class " B ” Team Racer 17/6 now 40. per half ounce. D.C. 350. 3-5 c.c. Diesel 46/8 K.K. Piper Super Cruiser, for ·5 engine 22/8 * * * JAP SILK * * * D.C. 350. 3 5 c.c. G low plug M ercury Chrislea Skyjeep. fo r -5 engine 26, 7 4 5 /- Stocks of this superior covering material are ETA 19, 3-2 c.c. Racing G low plug 124 5 Veron C ardinal F.F., lo r ·5 -Ί c c . 17/8 ETA 29. 5 c.c. Racing G low plug still available. 149/5 * * * POPULAR KITS * * * Panels containing 11 sq. yds. ... 4 / - * * * RADIO CONTROL * * * K.K. Ladybird F.F.. fo r 5-1 c.c. 22 8 Complete 'chute of 16 panels 60/— E.D. Mk. Ill Complete R/C Unit 197/11 K .K . Ranger, Class ” A " T.R., 1-2 S c.c. 12/10 Comet Mk. 1 Complete R/C Unit 179/6 Veron Panther Stunt C/L, 5 c.c. ... 30/6 E.C.C. 950A Receiver 67 6 M ercury Mk. I. Class ’ ’ 8 " T.R.. 2-5-5 c.c. 22/4 E.D. Mk. Ill Recgiver . . . . 7 5 /- Veron M inibustcr. Class " A ’ ’ T.R .. I c.c.- Comet Mk. 1 Receiver . 7 5 /- 2-5 c.c. 18/4 E.D. Mk. 1 Receiver 192/3 Elf King C/L Stunt. I c.c.-2’5 c.c. 12/6 ROLAND SCOTT Comet Mk. 1 Transmitter, complete 87/6 Frog Diana Sailplane ...... 9 / - E.D. Mk. Ill Transmitter, complete 114/9 Frog C irrus F.F., fo r I ·5-2·5 c.c. 25/6 JHE MODEL SPECIALIST D.C .C . 90 Valves ...... 35 10 Veron F.W. 190. Scale Stunt. 2 S-S c.c. 23 10 X F G I Valves ...... 21/4 Mercury Mk. II Team Racor, Clast “ A ” 17/6 185, CAMBRIDGE RD., ST. HELENS

...... B A R O N s THE BARON RANGE Baron Quality Products, each RADIO CONTROL EQUIPMENT BLUE LABEL 1/9 a finely balanced formulation, ETHER 579 3' are rigorously tried and YOU CAN BUILD YOURSELF Π RED LABEL I '9 DESIGNED FOR— SUPERGLO 2 tested before being Intro­ NITRO-SUPERGLO 3 /6 ★ EASY C O N STR U C TIO N From fu lly detailed plans and duced for the approval of instructions. l o t . 2 ox. the discerning modeller and L O W C O S T ...... W# can supply all the com­ Balsa Cement 7d */l to be acclaimed as the finest ponents. valves, relay, etc. Perspex Cement lOd. + R E LIA B ILITY ...... Just check up on the R /C and most comprehensive contests won with FLIGHT Small 4 ox. I p '· range of its class available. CONTROL equipment ! Clear Shrink- ing Dope ·/- 1/ - 4 / Banana O il... 1/3 3/- 4 / ★ W RITE FOR O U R LATEST PRICE LISTS A N D FULL DETAILS OF:— Coloured " The Mk. 4 Transmitter for 27 mc/$.” . Manual 3/6 Dopes ... 1/3 2 /4 4 /4 One Quality— ’’ A Home Built Radio Control System for Models ” 4 /- Grain Filler 1 3 2 /6 4 / - “ The Type I Frequency Meter for 27 mc/s." 18/6 Cellulose (Complete with full instructions and ready to use.) Thinner» 1/4 The Finest — (P.C. w ill do.) (O r see last month's advert, for prices of all components for above.) Fuel Proof Dopes ★ Clear 1 3 2 6 5 Full stock ofVALVES. RELAYS. COILS. VALVEHOLDERS, CON­ Colours 1/6 V- 6/- Sole Makers for E.D. of Fuel Proof the renowned E.D. Diesel DENSERS. RESISTORS. COIL FORMERS. MICRO-SW ITCHES, etc. Thinners — 1/3 — Fuels. BUY THESE NOW . SUPPLIES ARE GETTING SHORT. T h e re is * • B A R O N ’ A e ro - 0-5 M O V IN G C O IL MILLI-AM P METERS 0-5 (brand new modelling Speciality f o r e v e ry No Mail Order— e x-G ovt.) ...... 7 /4 each irixewinning and record break- Typo 73 and Type 85 SIEMENS RELAYS (3,400 ohms), fng occasion. Buy through your Model Shop. brand new ...... 27/6 each

WATCH THIS ADVERT. FOR ANNOUNCEMENT OF Manufactured and guaranteed by :— A NEW R/C RECEIVER BARRON INDUSTRIES FLIGHT CONTROL (A) (CHESTERFIELD) :: LIMITED 783, Romford Road, Manor Park, London, E.2 WHEATBRIDGE ROAD, CHESTERFIELD (or phone ILFord 2066)

liitullif mention AEROMODELLER irhrn rvphfini/ to oiliwftiset s January, rg5s 59 Aeromodeller

W e DO NOT offer Competition Winner !

THE ELFIN •Sc.c. DIESEL

With finish, endurance, reliability and performance com parable to previous klfin designs But we DO offer you ★ SOME 1951 COMPETITION WINNERS: C o ld T ro p h y — 1st : Alan H e w itt. S h e lle y C u p — 1st : Pete W ya tt. The best H IR E P U R C H A S E TERMS on Engines, Bowden International Trophy—1st : R. Ward. Aeromodeller R/C K it and Radio C ontrol Units. Trophy— 1st: W. H. Taylor. Knokke sur Mor Open Stunt—1st : Alan H e w itt. ·· S c h ip o l ” A m s te rd a m — 1st : Class III— Speed : N O D E P O S IT S C H E M E for all customers who have E. K. Rculin and L. K. Suit. Swedish Contest Record—3rd May— completed a purchase in a satisfactory manner. Λ v ^ Model Race C ar '· Alfa R o m e o " pow ered by Elfin 2-49. Speed 104 km ./hr. THE MODEL STADIUM Made by AEROL ENGINEERING, LIVERPOOL 3 HIRE PURCHASE SPECIALISTS Home Trade distribution through 5, Village Way East, Rayners Lane, Harrow, Middlesex (2 m im . Raynen Lone Station.) Jel. PIN-nr A4S9 E. KEIL & C O M P A N Y LTD . S.A.E. lo r enquiries please. Engines r u tfio r Personal Callers. London E.2

M»d» by modcilers for modollort I Flamboyant Finish. The new finish for ^ SUPPLIERS TO THE TRADE joy- M odel Planet. Imparts a metallic sheen in colour, : a n d adds great plane strength to tissue : can be clear Fuel Proofed ALL FIRST CLASS whon dry. Made in all popular colours. Sizes BALSA 1/6 , 7 /9 and 4 '. MODELLING C e l l u l o s e W ing Dopes. 2i oz. t*n 13, 5 01. tin 2 /-.} pint 4/-, Φ + TIMBERS — WOOD Extra strong for petrol models, } pint 5/-. BALSA. OBECHE. Cellulose Banana O il. No. I Thick. No. ^ ^ MAHOGANY, CEMENT 2 Thin. 2} 01. tin 1/3, 5 oz. 2 / - , J p in t 4 /- . SPRUCE, ETC· is produced in Plastic Wood for three different Balsa, i lb. tins 1/9, types of tubes : tubes lO d. N O R M A L Model Dopes (cellu­ N O Z Z L E . lose). 2$ oz. tin 1/4, PRICE LIST ^ LONG NOZZLE S oz. tin 2 /9 , j p in t 4/4. for applying in All popular colours. awkward spots. Tissue Paste. Jars or AND TRADE SCREW CAP tubes 7Jd. for occasional Silver Dope. 2} oz. TERMS ON uso. A ll o f course tin 1/4, 5 oz. tin 2/9, contain the strong­ 4 pint 4/4. est. lightest and Crain Filler (W hite REQUEST \ highest quality. and Grev). 2J oz. tin Display boxes of 1/4 , } p in t 4/4 . % 3 dor. tubes. Ad. Rubber Lubricant9d. and I04d. Extra W aterproof finish large tube 1/4. (Goldbeater Skin E'fect) 9d. Fuel Proof Finish. E. LAW & SON (TIMBER) LTD. Turnbridge Mfg. 24 oz. tin 1/4, 5 oz. A S u p p ly C o . L td . tin 2/9, J pint 4/4. 272-274, HIGH ST., SUTTON, $2a-42a, Longley Clear and in colours Red. Blue, Golden SURREY. Tel: VIGILANT 8291/2 · R oad, Yellow. Croam. London. S.W.I7. Orange and Black.

H i it ill if inrntion A E ltO M O D E LLE Il trh rn replying to odrertism s Aeromodeller 60 ‘January, 1952

customer» old and new are advised that the well-known "DIRE rC ellulose T A P E will in future be known ns «SCOTCH BOY” TAPE ★ ★ ★ the name of the nuinuf acturing compinv DUREX ARRASIVES LTD. has been changed to MINNESOTA MINING & MANUFACTURING CO. LTD. to which nil future communications should Ideal for Modelling be addressed. etc., and quite safe when not in use / Λ COMPLETE WITH THREE BLADES 3Ό OF DIFFERENT SHAPES Spar a b la d e * 6d. each. MINNESOTA MINING * MANUFACTURING COMPANY LTD. Order from your usual suppliers and not the sole makers— John & Wm. Ragg, Ltd. Arden llqnd. Adder ley Park, Itirmingham, 8.

THE EE-ZE-BILO Maut-ta-da-it p la n e d \ Alaywzine af, ‘US. GLIDER Aladetdom

A popular easy Read FLYING MODELS, to make model, the only American magazine ex ceptionally ALSO AVAILABLE: K.K. Cadet 30' glider 4 devoted exclusively to durable and K.K. Soarer Minor 48’ capable of out· glider 1 model aviation ! Every issue includes how-to- standing flights. K.K. Chief 64· glider 23 Mercury Maybug 32" rubber 1 build data on new model airplanes of various K.K. Scale flying series 3 IF YOUR DEALER K.K. Acc 30' rubber < types (with full-size plans wherever possible) DOES NOT K .K .S enator 32* rubber < . . . worth-while hints .. . photographs . . . how- STOCK THIS Vcron Minibuster 19* CL ...... If MODEL A 3/- K.K Ladybird 40' F F 23 to-do-lt information . . . and features for sport POSTAL ORDER E.D. Bec I c.C- Diesel S3 WILL BRING IT Jete* * 53 ’ Unit .. 13 aplenty ! TOYOURDOOR A ll the latest kits and accessories Published every other month. Annual (6-issue) subscription : 12/6. SEND STAMPS FOR ORDERS OVER £1.0.0 FULL LISTS OF POWER, A POST FREE. UNDER DURATION. CONTROL W η4Γ>ΛΙ/ LINE MODELS. ETC. £1.0.0 ADD I/- Mall your order and remittance to-day to : WOODSIDE MODEL SUPPLIES ATLAS PUBLISHING & DISTRIBUTING C 0.t LTD. 72. SHIRLEY RD.. CROYDON. SURREY. (D ept. A), 18 Bride Lane, Fleet Street. London, E.C.4

Kimllft mention AEROMODELLER when reply In y to a

PRICE Presents the N O R D IC A 2 S A IL P L A N E FUELS 226 SHELL dovoto Postage ! / - t t u e n g w ” much care and re­ search to producing fuels for model air­ craft as to the evolu­ tion of specialised grades for giant aero Designed exclusively for Contest engines. Two new specially developed Kits by ). A. GORHAM (1950 PLANS AND CUT RIBS O N L Y : 1 0 /- Shell fuels are now available — the National Champion). result of close co-operation with the Look at these unique features : Contents t Ample quantity of Knock-off nose ; swept-back wing- selected "Solarbo" balsa, including Frog engineers of International tips and tail ; Sheeted box con­ shaped trailing edges. Pre-shaped Model Aircraft Ltd.:—- stru ctio n fusolage fo r easo o f fuselage parts and printed sheet. building and strength ; Auto rud­ D ow el. Modelspan. Plan com plete der ; Contest winning airfoil with illustrated step-by-step build­ SHELL POWA-MIX for model dlesei section. ing instructions. ACCESSORIES FOR CONTEST MODELLERS aircraft enginos. GEARS. Designed and used by DOPES. " Contest " Full Strength. J. A. Gorham. From 2 /- each. Clear. 4 /- half pint. Used with lor hot coil en- 16 S.W .G . Ball Races 8d. each. 50 per cont. thinnors, gives a SHELL RED GLOW Bobbins—Large lOJd. Med. ?d. wonderful glossy finish. ginoa and for spark ignition engines with too SOLARBO BALSA at advertised prices, specially selected for contest THINNERS. 2/6 per half pint. high a compression ratio for gasoline mixtures. building. Minimum order S/-. Post and carriage extra. Sold in half-pint pressure fuel packs for easier, swifter re­ h:\SV Λ\<«Ι,1Λ\ YIOIMI, 8UPFLIKS fuelling, by International Model Aircraft Ltd., Tri-Ang 3 7, UPPER ORWELL STREET. IPSWICH W o rks. M orden Road. S.W .I9. Telephone : 51195

THE FLUXITE QUINS A T W O R K . ALLBON ·· At soldering i t ’s FLUXITE. that serves. it DART Our cute little tram is mended again. But gosh I it's too fast for φ THE IDEAL POWER the curvesI" UNIT FOR SMALL See that FLU X IT E is always by you—in the house— FREE FLIGHT MODELS garage — workshop — wherever speedy soldering is • EXCEPTIONAL POWER needed- Used for over 40 years in Government WEIGHT RATIO works and by leading Engineers and manufacturers. OF ALL IRONMONGERS IN TINS I/- upwards φ EASY STARTING TO CYCLISTS ! Your wheels w ill • PRICE 65/2 not keep round and true unless the spokes are tied w ith fine wire M e t D IE S E L at the crossing AN D SOLDERED. This makes a much stronger wheel. It’ssimple—w ith FLUXITE —but IMPORTANT · L.S.A.R.A. Report ALL MECHANICS •■Our test report (o f the O ort) gives o peek power o f 0 0 5 3 h.p. ot 14.500 r.p.m. W e first got results o f this THE order some months ago. but hare checked them by three ·· FLUXITE different methods os we found them unbelievable, and GUN " putt recheckmg has been the cause o f the delay.” FLUXITE w here you FLUXITE want it by a sim ple i ΓΓ SIMPLIFIES ALL SOLDERING pressure. • W rite fo r book on the a rt of “ SOFT " SOLDERING and ALLBON ENGINEERING CO., LTD. 5 fo r I 'o fh t on CASE HARDENING STEEL and TEMPERING Pric· 2/4 or • TOOLS with FLUXITE Price / jd . coch. THE FORGE, COPLE, BEDFORD fille d 3 /6 FLUXITE LTD., (Dept M.A.), Bermondsey S t, 8.E.1

lit ml Itf m ention AEKO.VIODBUJSft trlwn replying to tnl fertise is Aeromodeller 62 J a n u a ry , 195 2

CLASSIFIED ADVIIRTISKMEATS- PRESS D A T E fo r F e b ru a ry , 1952 issue D e c e m b e r 2 0 th , 1951. • The NEW MODEL ADVERTISEMENT RATES t MAKER cater* for all Private Minimum 18 words 4s·, and 4. Mk. I Transmitter, unused, £4. thing there each month Unused Frog 500 G.P., £2. 10s. Wildcat 5 o.c., £1. 10e. fo r you. O th e r aspects Box. No. 349. include photographic Now Redhead Dynajet. New Hasead Bluestrenk. £9 gadgets you can make— each or offore. Oyster, '* Warrcndale Uckfiold, Sussex. modellers are nearly all J scale Austor. 10 c.c. Nordoc engine, radio-controlled, photographers I — im- packs in box. Cost £75, Rood condition, to clear, £30. provements to your 14. Lucerne Road, Thornton llcath, Surrey. home workshop, in fact Poi ter 29 with «oil. unused, £4. Yulon 89 bendb ran, any and everything to with 3 plug*, accumulator and fuel, £3. 10a. Knowlson. YOUR COPY " waiting for w hich the man — o r ScKsuy, Thlrsk, Yorks. you ot your woman — with the urge Junior 00 with E.D. Mk. Ill, £5. 10s. Pkyskooter, with usual model shop or newsagent. I f In any to make models w ill turn Elfin 1*8, £5. Two 1000 ear ciutwds with 2 5 Mills and 5 c.c. a hand. Above all, Wildest. £4 each or offers to tlio above. Byrne, Poolspi ingo, difficulty tend P.0. fo r 2/- and secure the current rem em ber MODEL Much Birch, Hereford. ” .ikystreok 40 ” powered by Wildcat 5 c.c. diesel, very number direct from the publishers. MODEL MAKER is a companion journal to AEROMODEL­ good condition, 8 0 /- or olTere. Ayres, 12, Tho Uroon, MAKER is the same size as AEROMODELLER and LER w ith the same b rig h t Tetbnry, Gloucester. contains 68 fact-packed pages for your fireside or approach, the same fine EXCHANGE diagrams and halftone E. D. comp, spocliil In semi-finished. “ Sea-fury ”, Tor any nrorkshop reading! illustrations. 2 c.c. engine. L>. Johnson, 19, Willoughby Road, Bourne, Lines. TRADE MONEY IN MODELS. Earn cash making Bonnott MODEL MAKER. Dept. AM 2, The Aerodrome Model Bungalow·» at home. Wo show you how and buy your work at guaranteed prices. Send stamped addressed BILUNGTON ROAD, STANBRIOGE, Nr. LEIGHTON BUZZARD, BEDS. onvelopo for free details. Bennett Models, Human Road. Richmond, Surrey. American Magazine*, one yoar's supply. poRt free. ·· Model Airpluno News”, 25/-; ” Popular Mechanics ”, 32/-; ” Flying ”, 28/9. For full list wind stamp to Wlllen Ltd. (Dept. 1). 101, Fleet Street, London. E.C.4. Now machinery from stock. Half-inch Motorised Drilling Machines, £19 ; Wood Pinning Machine* from €9 ; Sanding Machines from £7 ; Forgo Blower*. Paint Spray Plants, Your Aeromodeller Electric Motors, Grinder*, etc. Doferrod terme available. Catalogue* from manufacturers, John Λ. Stool, Dept. 74, on time. . Every time Blngley. Yorks. Any where GREAT WEST MODELS 474, GREAT WEST ROAD. HOUNSLOW, MIDDLESEX MAIL ORDER. Order from Great West fo r speedy and efficient service Modellers in 60 countries use the subscrip RADIO EQUIPMENT KITS—CONTROL LINE tion method to ensure the arrival of their E.D. M k. Ill com plete R /C K e il K ra ft Ranger...... 12/10 £ 9 . 1 7 . I I Mercury Musketeer ... 24/9 monthly copy regularly on the earliest E.D. Mk. I complete R/C Skyleada Auster . . 9/- £17 . 19.9 Veron Focke-Wull 190 ... 2J/I0 possible date. There are Aeromodeller Minimiter Transmitter £4.7.6 IVY Receiver ... £4.7.6 KITS—F/F POWER Agents in 28 countries through whom ENGINES Kell Kraft Ladybird 22 8 subscriptions can be arranged, or you can Amco -87 Diesel 72/6 K.K. Piper Super Cruiser 22/8 E.D. Bco I c.c. Diesel . . . 5 2 '6 K.K. Cessna 170 22 8 take yours direct with us. E.D. 2 c.c. Comp. Spec. 6 0 /- •Mercury Monocoupe L7A 64/- E.D. 2 46 Racer 7 2'6 Mercury Monocoupe 40 . 24/7 Sole American Agent: Gull Model Airplane Co., E.D. Mk. IV 3 46 Diesel 7 5 /- Halfax Javelin ...... 27 6 E lft* I 49—59/4 ; 2 49—7 0 /- •E.D. Radio Queen . 85/- 10, East Overlea Avc., Baltimore, Md., U.S.A. ETA · 19 — 124 5 : ‘ 29 — 149 5 •Veron Skyskooter . 3 0'4 M ills S.7S—6 6 /9 ; I 3—91/1 •K.K. Junior 60 48/3 S u b s c rip tio n R ate t $4:50. DC 350—87 4 ; Reeve* I 8-62 6 •Ke.l Kraft Fakon 131/5 Frog 150—49 '4 : 500 GP— 7 5 /- • Suitable to r R /C . Sole Australian Agent: George Mason, 4, Princes Walk, Melbourne, C.l, Australia For the name of your nearest Agent, send a postcard to Conditions of Sale . . . . This periodica· is sold subject to the following conditions :— Thai it shall not, without the written consent of the publish­ AEROMODELLER, ers. be lent, resold, hired-out, or otherwise disposed o l by way ol Trade cxcopt at the full retail price of 1/6 and that ALLEN HOUSE, NEWARKE STREET, it shall not be lent, resold, hired-out. or otherwise disposed of in mutilated condition or in any unauthorised cover by LEICESTER, ENGLAND. way of Trade; or affixed to or as part of any publication or advertising, literary or pictorial matter whatsoever.

Kindly mention AEROMODKLLKH trhen replying to adrertisers ( ljd . stam p) hoforo hoforo e p p) lo e v stam n e . an ljd in d ( it le a e s slip n u perforated and line the on along (in ind m our y page you change case in first next pencil the favourite future the shaping In otn t te Edi­ the Offices. to torial posting out tear ·), m ite any and this ues­ q on the tionnaire plete om C s t n e t n o c co­ Roador r. M you* operation Incite We i 2 $ ig , y r a u n a J

□□□□□□□□□□□ PREFERENCE OF ORDER IN 22 1to FROM NUMBER PLEASE HEARD at the HANGAR DOORS HANGAR the at HEARD AIRCRAFT DESCRIBED DESCRIBED AIRCRAFT TRADE REVIEW REVIEW TRADE REVIEW GADGET YOUR MODEL SHOP SHOP MODEL YOUR YOU FOR DESIGNED IT’S DESIGNS & PLANS EDITORIAL AI CNRL NOTES CONTROL RADIO ANALYSIS ENGINE BEGINNER the ESPECIALLY for agazine. m o f f o * u o y edr’ Survey Readers’ AE Mrs...... NAME ADDRESS Miss Mr. LC LnR PLEASE LEnERS BLOCK | CLUB U L -C | RLD O S-W EW I N | | T” H 1 CONTEST REPORTS(lnternational) RIG W FIXIT 1 “ | | | OSRCINL ARTICLES CONSTRUCTIONAL | ARTICLES ODEL -M | THEORETICAL | | | I (Home) REPORTS CONTEST | | | UOOS ARTICLES HUMOROUS | LETTERS | READERS’ I | CARTOONS ...... AGE ...... Aeromodeller Aeromodeller January, 1952

M y favourite class of model is We would appreciate answers to these questions on your COMPETITION □ Z modelling habits c 2 How many Engines do you own ?...... SPORTS (GENERAL) o □ ...... Diesel ...... Gloplug 9 FLYING SCALE ...... Ignition ...... Jctcx □ n * NON-FLYING SCALE Do you build from Kits ?...... □ Published plans i...... Own designs i......

Have you a flying field ?...... □ RUBBER POWERED By arrangement with the Local Council ?...... □ ENGINE POWERED How do you normally travel to your flying ground ! SAILPLANES & GLIDERS □ z By motor car...... By motor cycle...... c By cycle...... By public transport...... □ JETEX POWERED ®2 JO Do you regularly read any other aeromodelling CONTROL LINE (STUNT) □ ξ magazines besides the AEROMODELLER ?...... 0D □ CONTROL LINE (SPEED) Do you have any other regular hobbies besides aeromodelling ?...... □ RADIO CONTROL (Name of hobbies) □ UNORTHODOX Do you pass on your AEROMODELLER to your friends ?...... 1 am a member of the If so, how many read it ?...... CLUB How long have you been reading AERO­ MODELLER ?...... Years 1 am a lone hand We thank you for your help in completing this questionnaire which will greatly assist the 1 usually fly with friends j Editor in providing you with an even better AEROMODELLER.

Should you care to send any further opinions 1 obtain my copy of | 1 Newsagent and suggestions not covered by the question­ the AEROMODELLER Q ] Local Model Shop naire on a separate sheet of paper they will be much appreciated. (You must, however, in from ~ j | Direct Subscription this event affix a 2£d. stamp and seal envelope.) We repeat, that the questionnaire only, can be slipped into an unsealed envelope (i£d. 1 purchase my modelling materials from postage).

[ 1 Local Model Shop By Mail Order Post as early as possible to: " READERS’ SURVEY ”, MY LOCAL MODEL DEALER IS THE “ AEROMODELLER^, ALLEN HOUSE, NAME NEWARKE STREET, ADDRESS ...... LEICESTER. TO ARRIVE NOT LATER THAN DECEMBER 31st 1951 TheShopwiththeStock

K e i l K r a f t K it s GLIDERS Vega. 12'. 1/4 : Spook. 12*. I 10 : Polaris, 2 0 \ 1/1 : Cadet. 30*. 4 I I ; Com et, 24*. 4 /3 ; Cub. 20*. 3 I . Soarer Baby. 36*. 6 I ; Invader, 40v, 7/11. RUBBER DRIVEN Pixie, 23*. 4 ; Playboy. 20". 4/- ; Strato Baby. 20“, 5 / - ; Ace. 30*. 4/1. POWER MODELS Slicker M.te, 32*. 11.7 ; Ranger. 24" Team Racer. 12/10. Every o th e r k it. Every accessory. Please add postage. 6 ) & β η ΙΟ- I I ’ 12* 13' 14* Ο ΙΑ . JONES BROS of CHISWICK ΓΙΟ I II 21* 2 4 2 9 3Όι 37 £ϊ.τ (4 min. from Turnham Grocn Station.) 4.12' 4-12’ 4-12* 4-12’ 4-8* 4 -9 ' 6* P IT C H 56· Turnham (*rec*n Terrace, W. l PROGRESS AERO WORKS, CHESTER ROAD, MACCLESFIELD l* h im e I'll I IPH&N E a t. I IP II.

WATCH THIS SPACE "C A L E Y ” Super Diesel fuel, J pint. 2/4 , post 6d (First in 1946. still best.) •‘CALEY EASIFLO" Dopes, no brush marks, one coat ‘ covers, 2 ο ι I / - , cols. I 3, l pt. 4 /- & 4/4. post extra I FOR ANNOUNCEMENTS "CLYDE " Yacht and Cruiser kits, finishod metal hull, etc. List 3 penny stamps. Largest stock in Scotland of all makes oi Diesel OF OUR 1952 and Petrol engines. E.D radio control units £9 17 6. Plans, books, castings, kits 'o r aircraft, ships race cars. etc. Everything tor the model enthusiast. RANGE OF ENGINES Ports mode to order ENGINE REPAIRS OTHERS CAN T TACKLE.

Ca l e d o n ia M o d e l Co . REEVES MODEL POW ER IM I S STREET GLASGOW C2 VICTORIA ROAD, SHIFNAL, SAI.OP IT’S IN! SILVERWING Yes, all wise model shops and booksellers received their AEROMODELLER ANNUAL ,'.-SCALE SOLIDS 1951 orders on December 1st ! There may still be one for you if you look sharp and hurry round at once : or jog the memory of whoever promised you one for Christmas ! It’s another grand “ gen” book to add to your library no matter what your aeromodelling speciality is. Over sixty plans of every kind of model, articles on all aspects of the hobby, international and national contest records, potted φ O ver 60 plans from all engine analysis—but go and have over the world. φ Articles a look at a copy for yourself ! on Radio Control. φ Jetox Scale Models. · W akefield 160 pages. Size 81x51 ins., Gears. φ M ulti - engined bound in c/oth and card with gilt title. Three colour cover of model Control Line. £ Team Brobozonat the Racing. φ Flying Wings. Festival. Price | Λ f The initial rattle consists of Six authentic Jet Fighters C Contests. φ Records, (Or 10, 9 post free I I I ^ m M l / IT MKTKOHMU ATTALKEH φ Engines, φ Championships. from the publishers.) I n iV M IE IU E T SA It HE M IG -Ι,Ϊ Srllintf price iluchuling l*.T.) - - 2 '6 MODEL AERONAUTICAL PRESS LTD. THE AERODROME. BILUNGTON ROAD. STANBRIDGE, HALFAX MODELS LIMITED NR. LEIGHTON BUZZARD. BEDS. GREEN MOUNT WORKS, HALIFAX, YORKS.

Made and printed in Great Britain by Alabaster, Viwmore Λ Sons, l.td ., London amt Maidstone, for the Proprietors, The Model Aeronautical Press, Ltd., Allen House. Newark/· Street. Ι. γ ρ τ*Ι γ Τ. Published by the Argus Pro>9, L td ., 42 44 Hoptoo Street, London. S .E .l, to whom all trade enquiries should be addressed. Registered nt the G.P.O, for transmission by Canadian Magazine Post. ! Hurt* a jolly, intvrvstiny Xmas Hi is yvur i\ ilh

0 5 We present this Christmas Shopping Guide the more simple kits in the Keilkraft range. You will find endless pleasure in the X building of these models. Of course, if you fancy something more advanced—ask y^ur dealer to show you the unrivalled KeilkrA(t^ f I .·:. USAfT 3ΑΓ2Τ. control line and free flight power models.' '

B y lor I he least expensive Jetcxpow ered fly ini· scale 3 8 hits on the m arket latlav. i n c . t a x Kits contain—full Sire Plan. Budding anfl O rio n 23 span flying Instructions, ample Building ant? P ix ie 23 span Covering Materials and Bubble Canopies P layboy 20 spar A ja x 30 span A> I p ric e s in c lu d e nut

RUBBER POWER PLYING SCALP This series contains 14 popular light planes Ask your dealer to show you Kit» luritom full-t'/e plan, building and flying rr>* true (ions. p.'nstu. propeller. ptosuc wheels and note plug, ample building materials. ALL ONE PRICE 3 8d. INC. TAX Choose one of these to build during the holidays

Keilkraft sends the season's greetings to friends and SEND s t a m p e d , a d d r e s s e d ENVELOPE FOR OUR NEW customers everywhere. Happy Landings in H)52 illustrated f o l d e r