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Aviation History
1913
1913 - 0079.PDF
JANUARY 18, 1913. /UGHT] THE " BONN-MAYER" MODEL PETROL MOTOR.—On the rl(?ht the motof is seen driving a 3 ft. 4 In. propeller of 2 ft. 6 In. pitch at 1,200 r.p.m. letting it run parallel to the end piece for about one and a half inches, as shown in Fig. 3. The same thing is, of course, done to the other side or half of the plane. In the ordinary way the majority of aeromodellists I have come across adopt the method shown in Fig. 4; some occasionally carry an extra rib lengthwise right across the plane. I have found that in covering a plane 01 this description the wires sometimes give way and turn over, consequently the planes are practically flat, and, in consequence, the models do not give such good results as they would do if properly cambered. I think you will find you get a much stronger plane, and one that will bear the strain of a taut covering without losing its shape, if constructed in the manner I suggest. 1 have constructed models for the past seven years, although I am only a youth, and from all my experiments I have found the best results when the planes have been constructed in the manner I suggest." The "Bonn-Mayer" Model Petrol Motor. We publish this week two illustrations of a new model petrol motor, designed by Mr. F. Mayer (Messrs. J. Bonn and Co., 97, New Oxford Street), which is to be known as the Bonn-Mayer Model Petrol Motor, and which the above-mentioned firm are about to place on the market—the one illustrated has just been delivered to a customer. The photo of the engine alone gives a very clear view of the motor as seen from the rear—showing the ignition gear (out of focus). The weight of the engine alone is under 7 lbs., and complete with battery coil, carburettor, propeller, fuel, and oil, i.e., in complete running order—1*12 lbs. It is hoped that a large model monoplane driven by one of these engines will be com plete in time to be exhibited at the forthcoming Show at Olympia in February next. Further particulars will be published later- including propeller thrust, B.H.P. of engine, &c. The plant is being entered at Olympia for the motor test. The photo showing the propeller revolving was taken by means of a two seconds exposure (flash light) and gives a very good idea of the speed. The draught from the propeller acted as an excellent broom, clearing the floor of all dirt, grit, &c. We certainly hope that not only the plant but also the monoplane referred to above will be not only on show but also amongst the competitors at Olympia. Experiments with large power-driven models are badly needed, for it is, it'appears to me, very largely by actual experiments with such models that the stability problem will in all probability be really solved. In the ® ® KITE AND MODEL AEROPLANE ASSOCIATION. Official Notices. British Model Records. /Distance ... A. E. Woollard • 1 Duration ... A. F. Houlberg (•Distance ... G. Rowlands... • 1 Duration ... A. F. Houlberg Duration ... G. P. Bragg-Smith ,. H. R. Weston .. F. W. Jannaway Hand-launched Off ground ... Hydro, off water .. Single-tractor screw, < Distance hand-launched ... I Duration 477 yards- 89 sees. 332 yards. 51 sees. 35 sees. 84 yards. 22 sees. case of a full-sized machine there is always the personal element— the personal equation of the pilot—to be taken into account, and no mathematical symbol can be found for that. A pilot can scarcely be supposed to allow the inherent stability of his machine to reach the limit (presuming he knew it, which as a matter of fact he would not) before applying personal control and adding that unknown personal quantity—x or whatever you like to term it— which upsets all further application of mathematical analysis. I say large power-driven models because the meteorological con ditions of the atmosphere are such as to preclude more or less the successful application of data culled from experiments with smaller models—to the successful solution of problems affecting full-sized machines. An Appreciative Letter. Mr. W. S. Butler, writing from Vista Grande, California, in his communication says: " I am particularly interested in model aviation, and your valuable magazine thas helped mein every way. At present I hold all the Pacific Coast model records. I made the first successful r.o.g. and hydro-aeroplane models in this part of the country, and I am having great success. My hand-launched record is 77 sees." We offer Mr. Butler our congratulations on his success. Model Club for Broadsuirs. Messrs. W. Leighton and Co. (10, Broadway, Broadstairs), writes informing us that it is proposed to form a model club there. A well fitted workshop will be provided, also committee rooms with every convenience. Prizes are also guaranteed by Messrs. Leighton, amongst others for originality of design, good workmanship, distance, duration, &c. In a word everything possible will be done to stimulate interest in model aviation. Model Club for Lincoln. Mr. E. M. F. Voss (Ashbourne St. Caths., Lincoln), writes saying that he has, in conjunction with a few friends, started a model club in that city, the club already numbering about a dozen members. He is desirous of hearing from others in that neighbour hood who may be interested. Mr. Ewen has promised the club his support. Kite Record Altitude. Will some reader who knows kindly forward post-card containing same ? The highest I know of, personally, is 11,080 ft. ® ® Official Trials.—The official trials fixed for Saturday last, January nth, had to be postponed on account of the severe storm and fo«. These will take place this afternoon (18th) at same time, viz., 3 p.m., on the Aero Models (Northern Branch) Ground, East Finchley. Official Observers.—Applications for appointment as official observers have been received and the appointments made will be published in next issue. Internitional Aero Show.—The place and date of the flying tests will be decided in a few days, after the various suggested places have been inspected. Also the judges selected will tie appointed. Membership.—The Council appeals to all those interested in aeronautics to join the Association. Proposal forms will be sent on application. 27, Victory Road, Wimbledon, S.W. W. H. AKEHURST, Hon. Sec. 79
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