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Aviation History
1911
1911 - 0041.PDF
JANUARY 14, 1911. TESTING MODEL PROPELLERS. [1019] I enclose a sketch of an apparatus that may easily be constructed in half an hour, and should, I think, be useful for testing model propellers. I should be glad to have your opinion of the same. The device consists essentially of a long bocm, mounted on a Divot bearing, free to revolve horizontally. On one extremity of this boom is mounted an elastic motor, in a similar manner to that generally in use on model aeroplanes, to which the propeller to be tested is fitted. The other extremity of the boom is counterpoised. Willenhall. F. LAW. [The idea is worth developing, but the device in its present form does not afford either a direct or even a comparative measurement of thrust.—ED.] CLAPHAM AERO CLUB. [1020] Urgent appeal to residents of Clapham and adjoining districts. The Clapham Aero Club is in great need of a few more members ; will you become one of them ? You have only to pay a small entrance fee and thereafter a weekly fee of 3d. In return for this you get free use of the club workshop, which is situated at 140, Manor Street, Clapham High Street, where you can rely on finding almost any tool you can possibly require to make your models; also a locker is provided for each member, where materials may be kept. Second, free use of the club library, where may be found all works that are useful and are sold at a reasonable price; also FLIGHT and Aero weekly and Aeronautics monthly. Third, a series of very interesting papers, experiments, and competitions are now being arranged. Fourth, the club is in a position to offer its members mateiials at greatly reduced prices. Is this not a very fair return for your T,d. weekly ? If you are interested write at once for fuller particulars to the secretary. J. DOLLITTLE, Hon. Secretary. 1, Avondale Mansion?, Bromells Road, Clapham, S.W. TWIN-SCREW MODELS. [1021] I have been an interested reader of your excellent paper for some time, and noticed in your issue of November 5th two letters (Nos. 875 and 876), showing diagrams of two model monoplanes of a type which seems to be most efficient and at the same time the most simple. But I should like to know why the makers of these two models (and also of the model on p. 906) fit their propeller- shafts at an angle to each other. Would they not be much more efficient if made parallel, as then each propeller would thrust in a direct line with the model's flight ? Could the owners inform me whether they use wood or fabric for their planes ? I have experimented with a number of small models of various types which I have made myself, but in all cases I find that, with a single propeller or tractor-screw, the models overturn, on account of the reaction of the elastic. Could any of your readers tell me how to obviate this without fitting two propellers ? Over, near Winsford. PERCY VERB. MODEL FLIGHT. [1022] With regard to the duration of model aeroplane flight, letter 821, it depends greatly on the size of your aeroplane and what motive power you have. On an average a model will fly for 30-40 sees., or, in some cases, 5° sees. If your model flew for 40 sees, it could be considered good. Nearly all competitions for models have a competition for the model flying longest in the air. Dorking. T- BARGMAN. [/OGHT] MODEL BLERIOT. [1023] I have pleasure in enclosing photos of a £th-seale mode! Bleriot I have just completed. I fitted it with a model Gnome motor and petrol tanks, itc. The propeller is a 9-in. Aerospeed, which I bought from A. Melcombe, Bedford. The frame is made from J-in. square poplar wood. Swansea. A. P. BROWN. MODEL VALKYRIE. [1024] I enclose drawings of a model aeroplane. Will you do me the favour of reproducing same in your valuable paper, which I consider so excellent ? The model may be of interest to others. I am rebuilding it now on a larger scale. I used grease-proof paper and best fretwork wood cut with a machine. The joints are pinned together. Macclesfield. C. C. H-ORNER. MODEL CONSTRUCTION. [1025] Will you through your valuable paper inform me how to- fasten the canvas to the ribs of my model aeroplane, as I cannot tack the fabric to them as they are only TV in. thick ? Will you or any of your readers inform me, and get me out of the difficulty > Do you think sticking them with solution is sufficient for under the ribs to keep the camber in the cloth ? Macclesfield. W. GALI.JMORE. [They may be stuck, or—if it is desired to take the model to> pieces again—preferably stitched down with thread.—Et).]
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