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Aviation History
1914
1914 - 1203.PDF
DECEMBER n, IQI4. We have received, the following from Mr H A l„i,. u model sec. K. and M.A.A. We still hone ,h.,' ,t: >Che' hon' will not fall through:- P' tbat thls «*>P«>tw«i " Regarding Wind Tunnel Experiment. "With reference to a paragraph which appeared in your last week but one . issue, I would like to point out that 1, looks as if we shall have to abandon the Laboratory Competition altogether this year, as Mr. Cooper, who undertook to hold the competition/for unavoidable reasons is unable to arrange matters. It is further pointed out 10 us that the Aeronautical Society is unable to'eive the prizes as stated in our programme. Should, however, any com petition be possible, all particulars will be published in good time " Mr. W. H. Akehurst's Olympla model. Reply to Query, p. 1148. By CLEMENT J. GANDY. In reply to your correspondent, who asks for the size of propeller and lifting p6wer of a model of 10 ft. span, I should like to suggest a method by which such a question might be answered. The method I refer to is by the use of the following well-known formulae used for estimating the power and speed of steamships. (i) Let-— = r, where L and Li are the lengths (or linear dimen-L) sions) of some chosen full size aeroplane and the model it is desired to construct respectively. Then (2) af2 where A and A, = areas in sq. ft. w£ (4) W w,' V and V, = speeds in ft. per sec. W and Wi = weights in lbs. (5) HZ 0r' „ HPandHP,= horsepowers. If one of these factors is fixed upon for the model, the others can be calculated from the particulars of any full-sized aeroplane by first finding r, and then using the above formula;. For approximate re sults the type of the model need not be the same as that of the full- sized machine. The machine chosen to work from should have a good speed range or plenty of plane area, and power should be allowed in the model to make up for less efficient plane sections and greater head resistance; although there is no reason why the efficiency of a well-made model should mot be nearly equal to that ot its pioto- ty?he figure thus obtained, if not accurate, will give a good idea of what the proportions, weight and power of the model should be In the case of the propeller, the diameter and pitch should be made to scale, and the speed of the tip in ft. per sec. should correspond to that of the prototype, or y, = -J-. V and V, m speed of tips in ft. per fee. I think that if direct drive is employed the engine speed will be 'TmTySound best to find the size and speed of propeller by "TbSng a power-driven model, it is best to first obtain the engine find gits power and the total weight of the po™ Pam, including fuel, because from these particulars it can be seen whether \j\M\ « is possible to make the model light enough, In conclusion, I nope that this letter may be of Interest to some of your readers. If required, I shall be pleased to work out an example to illustrate this method, and should be glad of any criticisms. Aeromodellists Serving with the Colours, Mr. G. H. Kilshaw (Hoe. Sec., Liverpool Aero Research Club) writes ; " I am sorry I could not lei you know before with respect to our members serving with the Colours, but up to now I have been unable to get to know definitely what regiment, &c, the last- named given in the list below is in. This is the cause of the delay. As soon, however, as I learn I will let you know. " IJverpool Mm Research CM. "J. F. Connolly, R.G.A., Lancashire and Cheshire Territorials. " Private A. G. Pugh, 6th Cavalry Field Ambulance, 3rd Cavalry Division (British Expeditionary Force). " M. Payne." " Hovt Aero Club. " 1-ance-Corporal Henry Hamilton, 8th Royal Sussex Cyclists. "Gunner H. Knowles, I.H.C. Sussex Regiment, T.R.F.A., Foreign Service." "Seeing in FLIGHT," writes Mr. George Englefield, " that you would be pleased to have names and details of aeromodellisu serving with the colours, I am sending in mine. I have been a reader of your excellent paper for some years, and I am a keen builder of model aeroplanes, having made and sold a large number. I had also a model in the 1013 Olympia Show. It was a scale Martinsyde monoplane. I sent you photos, and details. I am building, or rather I was building before I joined, a 46-inch tractor with a 14-inch propeller, Bleriot fuselage and Nieuport chassis, with main planes of my own design, tail planes and rudder of Bleriot pattern. "G. Englefield, 6th Reserve Cycling Corps, Royal Sussex Regiment. D Company." A racing monoplane model of the "early oav»," by Mr. Dean.—It was made tn America lo 1911, la 33 Ins. long (main plane 24 ins. by 1\ ins., elevator 12 las. by U tns.) and a fast filer, has 8-in. propellers, steam bent- wood planes (white wood). 600 turns give 15 sees, duration only Fuselage made of J-tn. square American poplar- Weight, 6 o*. Best flight with 500 turns, 180 yds. The Paddington Club and Research Work. We shall be pleased to hear the views of club secretaries and of others in connection with Mr. W. E. Evans' communication in our last week's issue before referring further to the matter. With respect to the " wind tunnel," we have already replied by letter, but this does not in any way affect any other remarks or information bearing on the subject. ® ® ® ® AFFILIATED MODEL CLUBS DIARY. Club reports of chief work done will be published monthly for the future. Secretaries' reports, to be included, must reach the Editor on the last Monday in each month. LeytonstoneandDlstrtctAeC(i4.LEYTONSTONERi).,STRATFOSt)) Due. 13TH, flying as usual, Waostead Flats, at 10 a.m. If w*t> meet at clubroom, ait, Dames Road, Forest Gate. Haddington and Districts <77» SWINDEKBY ROAD, WKMBLEY). DEC. 12TH, twin-icrew competition, postponed from la«t week. Meet, after flying, at secretary's bouse. 1203
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