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Aviation History
1931
1931 - 0238.PDF
FLIGHT, MARCH 13, 1931 H.M. AIRCRAFT CARRIER " EAGLE " : This floating aerodromewill be the home, during the Exhibition, of Hawker " Nimrods " and "Ospreys," and Fairey III F's with "Panther" engine, inaddition to its normal equipment of Blackburn " Ripons " and Fairey III F's (Napier). (Official R.A.F. Photograph, Crown Copyright.) the type of construction used), a lower main plane withaileron, cases of spar and rib sections, and a proof loading test machine. The proof loading of an " Atlas " spar is demonstratedin the following manner : A 15 ft. length of spar is supported at its ends, and has a load of 500 lb. applied at the centre.The outside fibre stress is 55 tons per sq. in., and the deflec- tion under this load is'6 inches. The spar is 3J inches deep,and is of the type used in the lower main plane of an " Atlas " machine. To pass the test, the spar must not retain anypermanent set when the load is removed. The " Atlas " spar shown in the testing machine has the following dimen-sions : Thickness of flanges 0-015 in. Thickness of cornices 0-012 in. Thickness of web 0-012 in. Thickness of jointingstrip 0-008 in. : The Bristol Aeroplane Co., Ltd.—The " Bristol " exhibitis a fairly small one, consisting of a sectioned " Jupiter " engine and models of the famous "•Bulldog " single-seaterfighter. The " Jupiter " exhibited! at Buenos Aires will be of particular interest to those visitors who have not beforehad an opportunity to see the internal economy of a radial aero-engine, since it isa sectioned engine driven by an electric motor, and the movements 6f the workingparts, such as crankshaft and camshaft, valves, etc., can be clearly followed. The " Bulldog," apart from being in usein large numbers in Great Britain, is gradually being supplied to more andmore countries, and at the present time il has been supplied for service in no lessthan nine different countries, including Great Britain, Australia, Sweden, Denmark, Siam,Latvia, and Estonia. For an aircraft to receive unanimous acceptance in any airforce, there are three branches which must be satisfied : the pilots must be satisfiedwith the flying qualities ; the maintenance staff must be satisfied with the ease andrapidity with which overhauls can be made ; and finally, the administrative authoritymust be satisfied that the machine is of reasonable cost in relation to the servicewhich it gives and to the durability under ordinary service conditions. From the factthat the "Bulldog" has been delivered to nine countries it would appear that allthese points have been successfully attained, and one can only regret that it has not beenfound possible for the Bristol company to send an actual machine to South America.Models and photographs, although showing a machine in a general way, cannot equalthe actual thing, and either a machin- in skeleton in the exhibition or a machineflying at El Palomar would have been preferable.The De Havilland Aircraft Co., Ltd. De Havilland's are represented by fourmachines, two at the exhibition and two at El Palomar. In both cases the machinesare a " Puss Moth " and a " Gipsy Moth " Both these are, as FLIGHT readers willhardly need to be reminded, light aeroplanes of types which have become extremelypopular all over the world. The first " Moth " may be said to have set a fashionin light 'planes which was followed for several years, while the " Puss Moth"undoubtedly also set a new standard in flying comfort at high speed. Added interestwill be lent to the " Puss Moth " exhibited by the fact that the Prince of Wales ownsa similar machine, which is actually now in South America. The " Gipsy Moth"exhibited is one of those with all-metal fuselage. A. V. Roe and Co., Ltd.—By way ofdemonstrating in a clear and convincing manner the versatility of their AdvancedTrainer, type 626, the Avro firm is showing six skeleton fuselages of this machine, eachfuselage being exhibited as equipped for one of the many functions for which the type626 can be used. The " Advanced Trainer," type 626, isan all-metal biplane, generally similar to the type 621, from which it has been developed, and isfitted with the 215-h.p. Armstrong-Siddeley "Lynx" engine. The fuselage is arranged to accommodate alter-natively the armament and equipment for each of the following separate and distinct branches of training : offen-sive gunnery (pilot's fixed gun), defensive gunnery (observer's gun), bombing, wireless telegraphy, aerial photography,navigation, and flying training. Although it is possible to change the equipment of one dutyfor that intended for another duty in a relatively short time, say, two hours, the designers have based their design on theassumption that in practice the advance training school will employ a series of 626 machines, each being fitted withthe equipment for one particular branch of training. Rolls-Royce, Ltd.—But one engine is shown by Rolls-Royce. This is one of the " F "—or, as it is now called, " Kestrel "—type, and is sectioned to show the internalworking parts, such as reduction gear, pistons, valve-operat- ing mechanism, supercharger gear train, rotor and diffuser,and auxiliary operating gear. The Rolls-Royce "Kestrel" DE HAVILLAND REPRESENTATIVES : Four machines are shownby this firm, two in the Exhibition and two flying at EVPalomar. In both cases the machines are a " Gipsy-Moth " and a " Pus- Moth."
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