M A Y I9S8 The W orld’s smallest production S o r e — .218' Price £3 . 5 . 0 diesel engine. This has been deve­ S t r o k e — .250- loped for the experienced Modeller C a p a c it y — .15 c.c. — .00? cu. ins. P. Tax 12. 6 and is ideal for small scale models. Weight— i or. Com plete with metal propeller blank. P r o p e lle r — 4$ d ia . Total £3 . 17 . 6 . ■ B o r e — .350- Undisputed champion of the ‘point Stroke— .350' fives’, it is built like a watch and C a p a c it y — .5 c.c. — .03 cu. in. j l DAR has a performance that would not W eight— 1± ozs. disgrace many larger engines. Propeller— C/L 6" x 4 — F F V x 4 “ For those with a tight budget this B o r e — .375- S t r o k e — .420- is the ideal engine. All the virtues Price £1 . 16 . 9 C a p a c it y — .76 c.c. of the Super Merlin, but without the — .46 cu. ins. P. Tax 7 . 1 W eight— li ozs. extra fittings. Positive lock needle Propeller— C/L 6*x6 v a lv e . — F /F V X 4- Total £2 . 3 . 10 B o r e — .375- Performance is as good as it looks, Stroke— .420' C a p a c it y — .76 c.c. and it really is easy to start and SUPER — .046 cu. ins. operate. Complete with propeller, W eight— IJ ozs. Propeller— C/L 6' x 6 spinner and tommy bar. 12 Im^^/HERII/If — F /F V x 4' B o r e — .425 The perfect engine for the beginner. S t r o k e — .420 Combines easy starting, flexibility Capacity— I c.c. Price £2 . 4 . m m s p it f ir e and long life with sparkling perfor­ — .06 cu. ins. mance. A limit stop ensures that W e i g h t — 3 o z s. P. Tax 8 . 6 Propeller— C/L 7" x ' the com pression setting can be found -F F 8" x 4 Total £2 . 12 . 7 without difficulty. This powerful m otor is ideal for the B o r e — .525 Stroke— .420- sm aller radio control model as well as C a p a c it y — 1.49 c.c. free-flight and control line. Com plete — .09 cu. ins. W eight— 3^ ozs. SABRE with propeller, spinner, tommy bar Propeller— C/L 7" x 6 an·! plastic fuel tank. — F ;F 8 ' X 4 A high performance engine with B o r e — .580 twin ball races, downdraught car­ Stroke— .575" Price £3 . 7 . 0 Capacity— 2.49 c.c. burettor and rear rotary valve. — .15 cu. ins. P. Tax 12 . II ■j R A PIER Provision for a two-speed fitting or W e i g h t — 5| o z s. choke assembly makes it ideal for Propeller— C/L 9" x 6 Total £3.19.11 . M i} contest work and radio control. — F F 9' x 4- A powerful, rugged motor suitable B o r e — .687' S t r o k e — .562 Price £3 . S . 0 for the larger model especially for C a p a c it y — 1.5 c.c. radio control work. Complete with — .21 cu. ins. P. Tax 12 . 6 ψ MANXMAN W eight— 5} ozs. spinner, tommy bar. and integral Propeller— C/L 9‘ x 8" plastic tank. — F /F I0~ x 6 Total £3 . 17 . 6 Engineered to last a DAVIES CHARLTON LTD. modelling lifetime by h il l ’s m e a d o w s d o u g l a s , is l e of m a n May, 1958 225 ISSBOMD One of a series of articles written by John Paterson, Managing Director of Solarbo Ltd. After all my talk about Balsa trees, I thought it would be more complete if readers could see a section of a Balsa tree, so I have specially imported some logs from Ecuador and by the time this goes to print most of our Accredited Dealers should have a section of these logs to show you. photo B If you will look at the photograph taken of a pile of these logs you will notice the very great variation in shape and size. If you look carefully you will be able to see the pith heart of the tree and how it put in my office. You can judge from the gap varies in position in the different logs. between the steel strapping and the wood just how In the other two pictures, I have drawn in ink much it has shrunk and you will also see what big the growth rings on a section of a Balsa log and also cracks can occur. indicated on photo B, by dotted lines, the kind of You can also realise why it is necessary to cut planks of wood that might be cut from a tree like relatively small pieces of Balsawood when the logs this. are sawn, otherwise they would just split in the I have deliberately chosen a log with the pith drying process. core, which is the growth centre of the tree, very much to one side. You will notice how year by year You will, no doubt, wonder why this particular the tree has put on much more wood on one side tree has grown so lop-sided. I cannot, of course, give than the other and, as you would expect, the wood an exact reason, but it would probably' be because it on this side is much lighter than on the other. had a more effective root run on one side than the You will, therefore, see that pieces of lumber cut other. It might have been a tree on the edge of a from this tree must have a great variation in the clump with less competition on one side than the density of the wood, both in the different pieces other, or there might have been a big rock on the and from side to side of the individual piece. side which has grown less. The reason I have shown two pictures of this The feed system of a tree, that is from root to section of a log is so that you can see how a log branches, is relatively localised in a vertical plane. splits as it dries and why, therefore, we cannot If you put a dye by the roots on one side of a tree it import Balsawood in log form. Photo B was taken will colour the branches immediately above it. If you twelve days after photo A. ring-bark a tree, leaving a gap on one side, the The section had been cut off a log which was still branches on that side will continue growing whilst green and banded tightly with steel strapping and the others die. THE BEST BALSA YOU CAN BUY COMES FROM COMMERCE WAY · LANCING ' SUSSEX SOLARBO TD Telephone: LANCING 2866-7-8 Telegrams: SOLARBO, WORTHING Kindly mention AEROM ODELLER when replying to advertisers m OBMB 226 May, 1958 L i i A Rubber Duration Tubular Stick Model capable of outstanding flight performances. Designed to withstand hard handling. The kit contains many ready-made and stamped-out parts, including READY-HOLLOWED BALSA FUSE­ LAGE- DIE-CUT RIBS, HAND-CARVED BALSA P R O P E L L E R , and with an easy to follow step-by-step instruction leaflet, the " N IM R O D " is quickly assembled W ing span 28 in. K IT P R IC E 18/9 (IncludingjTax) Over 100 other VERO N construction kits available from 14 different ranges including: TRU-FLITES - CONTROL-LINE SOLIDS - POWER DURATION GLIDERS - ‘QUICKIES’ (Rubber POLICE LAUNCH and Jetex) also a wide selection of DIESEL & ELECTRIC MOTOR LAUNCHES, TUGS & COASTERS, YACHTS & HYDROPLANES Sole Distributors of the famous ‘TAYCOL’ Electric Motors and a complete range of Flight and FUEL Marine accessories TANKS -SORBO' RUBBER WHEELS Ask your dealer for FREE Illustrated "V E R O N " Pocket Folder or send to us. o M O D E L A I R C RAF T (Boumemouth)LTD. NORWOOD PLACE · BOURNEMOUTH · HANTS Telephone: SOUTHBOURNE 43061 -WHOLESALE ONLY Kindly mention A E ROMO DULLER when replying to advertisers May, 1958 kits... accessories A.A.HALES l t d FLYING RADIO CONTROL UNITS SCALE P A T H F I N D E R receiver £5.19.6 High stability single-valve circuit, giving reliable operation over a wide range of battery voltages and operating conditions. A current change of SO EASY TO ASSEMBLE! 3.5 to 4 milliamps ensures faultless relay operation. A sealed unit with simple tuning PRE-FABRICATED, PRE-DECORATED! controls— tested by your local dealer and fully EVERY ONE A FLYER! guaranteed. O nly V u AERONCA SEDAN PACER S&fr PUSS MOTH Sk-AUSTER ' ^ + m D D Q G PATHEINDER transmitter £4.19.6 High overall efficiency radiating adequate NEW MODELS COMING IN THIS SERIES! power for all normal requirements. The rugged - steel case is finished in stove-enamelled grey m y ' / t c COLOUR c o d ed / "hammertone". Economy and signalling push­ TANKS buttons conveniently located for easy operation. Lightweight aerial. Tested by your local dealer and fully guaranteed. Turquoise (llxlixi) Maroon (7 *5 c.c.) Blue ( U x 11x2) Brown (14*5 c.c.) Red (lj x 1 j x S) Grey (29-8 c.c.) Yellow (2J x 1J x 5) Green (21 x 2 x 5) INSIGNIA Dress up that model M A C T U A T O R ...