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Aviation History
1920
1920 - 0787.PDF
JULY 15, 1920 All communications to be addressed to the Model Editor, A stamp should be enclosed for a postal reply Exhibits at the Aero Show THE model portion of the Aero Show, although of somewhatattenuated proportions compared to those of the dim and hoary pre-War days, nevertheless was symptomatic of arecrudescence of pre-War activities. The H.P. Club Display One club only (the Handley Page Model Club, under the energetic secretaryship of Mr. A. B. Hudson) exhibited, with a collection of 16 models made by members as follows :— Mr. G. P. Appleb^e, bmlt-\np-fuselage biplane, r.o.g. type ; Mr. R. Davy, biplane embodying an interesting system of all-wire construction ; Mr. A. B. Hudson, built-up-fuselage biplane ; Mr. D. W. Wilson, a covered-in biplane, ingeniously thought out; Mr. N. A. Turner, tractor monoplane ; Mr. A. V. Piper, pusher-type monoplane ; Mr. M. H. Taylor, tractorx biplane ; Mr. E. Sutton, glider for testing weather condi- tions ; Mr. A. N. Clifton, pusher model of the i-—1—P2 type ; Messrs. N. A. Turner and G. P. Applebee, twin-screw pusher type hydroplane; Mr. R. Sheen, scale model 0,400 Handley Page ; Mr. C. A. Pearce, scale model Ponnier monoplane, also a scale model " Avro Baby " ; Messrs. A. B. Hudson and D. W. Wilson, scale model D.H. 9 ; " The Club," scale model V.1500 Handley Page, built by the members in collaboration, and Mr. A. E. Mitchell, a twin fuselage tractor biplane. Messrs. A. E. Jones, Ltd., 57, High Street, New Oxford Street, London, W. 1.—This firm, the oldest accessory firm in England, had on vew a fine collection of flying models which were departures from the usual " flying stick " type, possess- ing built-up and covered-in fuselages and double surfaced wings which were extremely pleasing in proportion and exceptionally well finished. After the vicissitudes of the model aeroplane movement, and the arrival and departure of many new firms, it is particularly gratifying to see one firm standing " four square to all the winds that blow." Messrs. Jones, have progressed with the times ; their stock has been consistently and thoroughly revised from time to time, in consonance with the fluctuations of popular favour. A type that is obsolete is not foisted on the market by means of the bolster of blatant advertisement, but has been superseded by newer and more up-to-date models. The firm obviously is run on engineering lines ; everything is standardised and made to jig, thus rendering them interchangeable. Quite an innovation from the commercial point of view is their hollow spar with the elastic motor enclosed. An inspection door near the front admits of view so that one may ascertain the condition of the gears (if such are used) and also the clastic. An interesting section of the business, too, is the non-flying scale models, which are accurately scaled from the proto- type ; quite a large range of these were shown. Also on exhibition on this firm's stand was the " Reely " compressed-air motor, an ingenious and well-made plant, capable, it is claimed, of developing nearly J h.p. The plant is a sound engineering job, and is of the three-cylinder fan type, with cam and tappet operated valves. As soon as particulars are available I shall refer to this interesting unit in greater detail. The accessories shown on the stand in- cluded samples of model aeroplane accessories, such as various sections of wood, carved propellers, ribs, shaped hollow spars; The "Reely" compressed air plant which is beingintroduced by Messrs. A. £. Jones, Ltd. steel wire, elastic, dope, varnish, lubricants, glue, proofed fabric, aluminium wheels, tangent spoke wheels, propeller winders, ball-bearing brackets, model wire strainers, eyebolts, bolts and nuts, screw eyes, steel nails, cup washers, propeller shafts, brass brackets, axles; streamline struts and other small parts for model aeroplane construction. The photographs herewith show some of the lines mentioned. D.A.P. Model Aero Engineering Co., 185, Replingham Road, Southfields, London, S.W. 18.—Scale models of full- size aircaft, compressed air plants and models, elastic driven models, materials, parts, accessories and gliders are features of this firm's business, examples of most of them being on exhibition. Bearing in mind the many years Mr. Paveley has given to the flying of models, one is pleased to hear of him doing well in the business. One interesting c.a. driven A Paveley model water-plane, with compressed air plant made by the D.A.P. Model Aero Engineering Co. hydroplane chassis was on show, together with their well- known plants which are meeting with popular favour. One is glad to notice a growing tendency among aero-modellists to make power-driven machines. The fact that previously there were only a few foreign-made plants of the genus rubbish on the market precluded many from making " power- driven " machines ; but now that firms such as those here dealt with are undertaking their manufacture there is no reason why the compressed-air system should not have a vogue equally as popular as the rubber motor. This firm also supply complete machines driven by their power uni£, and some interesting photos, were shown of them in flight and well-up. (To be Continued) To Calculate the Horse-Power of a Rubber Motor ASSUME the screw is wound to 500 turns, that it runs downin 20 sees., and the mean thrust is 3 oz., pitch being 15 ins., and mean speed 1,100 r.p.m. The number of foot-pounds ofenergy developed= 3 oz. x 1,100 x ij ft. pitcn 16 oz. = 258 ft. lb. per min. approx. Since the motor runs down in 20 sees., the energy actually developed= 258x20 - • -=86.0 ft. lb. . ••.-. 60 . ;, . -.. .;. . >••• The motor develops power in the order . 258 = .0079 h.p., but for 20 sees. only. 33,000 Replies to Correspondents A.S. (St. Margaret's).—I duly forwarded your letter andreplied direct. A. E. P. (Portsmouth).—You have probably heard from Mr. Groves ere this. With tractor machines the centre of thrust should certainly be slightly above the centre of resistance to overcome the stalling effect. H. I. (Stroud).—Many thanks for the drawings. t x-• -0. 87
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