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Aviation History
1915
1915 - 0366.PDF
(/ygBg MODELS. Edited by V. E. JOHNSON, M.A. Speed of Pusher v. Tractor. MR. W. E. EVANS, hon. sec. of the Paddington and Districts Aero Club, writes as follows:— " My plan for carrying out this test is as follows : One model only is being used, namely, an ordinary tractor monoplane, driven by a single skein of rubber. It must be batat in mind that it is unnecessary for the model to rise off ground for the purposes of this test. Nevertheless a chassis has been fitted in order to keep the e.g. as far forward as possible. No tail skid is fitted because it would serve no useful purpose. The rubber being below the fuselage, the rear hook acts as a skid, and as a matter of fact the model has risen off and flown for 30 sees, or more. Before describing the change over, a few details of construction must be explainer . The fuselage is a D section hollow spar of silver spruce 3 ft. 6 ins. long, 4 in. by k in. This, I find, is very rigid and fairly light. The tension of the rubber neither bends nor twists the spar. The tail is fixed entirely on the fusda^c, and does not extend beyond it as is often the case. The propeller bearing and the rubber hook at other end are soldered on to brats caps which are a firm fit on the ends of the D spar. Now all that is necessary to convert the tractor into a pusher is to remove the propeller bearing to the rear end of fuselage and the rear hook to the front. The same propeller is used, but with the hook reversed. The only other adjustment necessary is to move the main plane a little farther back to counteract the altered distribution of weight caused by having the propeller at the rear instead of at the front. The head resistance of the model when gliding will be the same in both cases. I did not mean that the head resistances would be the same in flight, because I contend that the slipstream of the tractor increases the head resistance, and therefore the tractor model should be slower than the pusher, whereas in full-size practice the pusher machine is slower than the tractor. Why is this? I should have pointed out that the model is not designed to rise off as a pusher and the propeller is unprotected, but I do not think this will affect the results aimed at. The model will be timed in calm weather) over a 100 ft. course, flights to be made both ways." Model Research Work. Mr. O. Hamilton, jun., of the Stony Stratford and District Kite and Model Aeroplane Club, writes as follows :— ""With reference to your remarks on model research work and the speed-loading table, I regret to state unfortunately that we cannot altogether claim a result from actual experiment, but we have carefully checked some figures we have collected with our formula, and find that the table gives very close results. " Regarding the source of information we obtained the table. Our contributor ' Thrust,' when he included the table in his notes, stated, ' I have discovered the following useful speed table, and I am including it in my notes for my readers' note books, the figures being taken from FLIGHT of January 15th, 1915, in answer to a query to Mr. J. Chapman.' '* I enclose a table of speeds and loadings. Table for loadings ranging between 3 and 8 ozs., calculated in miles per hour and feet per sec., as suggested to me by Mr. Evans." We hope to have some more interesting figures on the subject later. Aids to Scitntifu M,>d,! Building.—The following table shows the relationship between the loading of a model and its speed :— Loading. Speed. Loading. Speed. o*s. per sq. ft. m.p.h. ft. per sec. ozs. per sq. ft. m.p.h. ft. persec. 3 10-3 15-2 Sf 144 211 3$ i°"8 i5'9 6 J47 21*6 34 11*2 16-4 6i 15*0 22-0 3$ u-6 17-0 64 15-3 224 4 12 17-6 6$ iS"6 228 4i 124 181 7 15-9 23-3 44 127 187 7i io-ifr 237 4l '3"J '9'2 74 >6-45 24-' 5 »34 197 71 167 24-5 Si »375 20-2 8 17 24-9 54 141 20-6 1 ® ® ® & AFFILIATED MODEL CLUBS DIARY. Club reports of chief work done will be published monthly for the future. Secretaries' reports, to 1* included, must reach the Editor on the last Monday in each month. Paddlngtoo. and Districts (77. SWINDBRBY ROAD, WEMBLEY). WHIT MONPAY : Two print are offered for the best and next best exhibition of flying, with any type of model, including compressed air. The usual flying ground will afterwards be closed until first Saturday in July. MAY 2i, 1915. The Aero Committee S.M.M.T. AT the last meeting of the Aero Committee of the Society oi Motor Manufacturers and Traders, Mr. J. E. Hutton was unani mously re-elected chairman for the ensuing year, and Mr. Louis Coatalen, of the Sunbeam Motor Car Co., Ltd., was elected to the committee. At present the committee is not directly represented on the Council or Management Committee of the Society, and it was decided to endeavour to obtain such representation. Acetylene Welded Fittings and Propellers. CLAIMING to be the first firm to be established in this country for aviation work, Messrs. T. W. K. Clarke and Co. have, in the past nine years, had an unique experience in all kinds of aeroplane and glider work. It is gratifying to hear that the excellence of their workmanship is now being appreciated in high quarters, as is shown by the fact that they now have on hand contracts from the Admiralty and War Office for Acetylene Welded Fittings and Propellors. These are specialties of the firm, who have put in special plant for the purpose, and they are open to do any kind of welded work and to manufacture propellers in any sizes or quantities at their works, High Street, Hampton Wick, Middlesex, near Kingston Bridge. Oleo Plugs in Demand. WE understand from Messrs. Leo Ripault and Co., of Poland Street, that in spite of the ever-increasing demand for Oleo plugs they are able to keep pace with it owing to the considerable addi tions which have been made to the machinery at their works. The plant has in fact been almost doubled, so there need be no hesitation in sending along orders for Oleo plugs either for aeroplane or motor car work, as prompt delivery can be given. A War Time Catalogue. THERE is a distinctly war time air about the latest catalogue issued by Gamages of Holborn. Not only has it a khaki cover, but it contains particulars of all sorts of things for those on active service abroad, or those who are doing their " bit" at home. Clothing equipment and useful articles for officers and men of the flying services or the anti-aircraft corps are all set forth, and among them may be noted some special caps and boots for aviators. Not only is the book full of good things, but it is an excellent example of wel'- balanced make-up, the illustrations and details of the various articles being most attractively arranged. A copy can be had on application to Gamages, Holborn, London, E.C. ® ® ® ® PUBLICATION RECEIVED. "What are the Wild Waves Saying?" Miss A. E. Weston, Royal Sailors' Rest, Portsmouth. ® ® ® ® NEW COMPANY REGISTERED. T. W. K. Clarke and Co., Ltd., Hampton Wick Works, High Street, Hampton Wick.—Capital ,£3,000, in 1,000 5 per cent. cum. pref. and 2,000 ordinary shares of £1 each. To take over the business of aeronautical and general engineers carried on by A. C. Gibbons as T. W. K. Clarke and Co. First directors, A. C. Gibbons, A. E. Pettingell, and H. Myram. ® ® ® ® Aeronautical Patents Published. Applied rop in ion. Published May 20th, 1915. T 3i775. J- BUCHANAN. Aircraft. 21,7*50. E. J. CONILL AND G. BEbSiBRE. Aviation engines. FLIGHT. 44. ST. MARTIN'S LANE, LONDON, W.C. Telegraphic address: Truditur, London. Telephone: 1828 Gerrard. SUBSCRIPTION RATES. FLIGHT will be forwarded, post free, at the following raits :— UNITED KINGDOM. ABROAD s. d. s. d. 3 Months, Post Free... 39 3 Months, Post Free... 5 o 6 •» »> — 7 6 6 „ „ ._ 10 o 12 " »» •-• x5 o 12 „ „ .„. 20 o Cheques and Post Office Orders should be made payable to the Proprietors ^FLIGHT, 44, St. Martin's Lane, W.C., and crossed London County and Westminster Bank, otherwise no responsibility will be accepted. Should any difficulty be experienced in procuring FLIGHT from local ntwsvendors, intending readers can obtain each issue direct from the Publishing Office, by forwarding remittance as above. 366
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