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Aviation History
1935
1935 - 0444.PDF
224 FLIGHT. FEBRUARY 28 T935- BUILT in the DUTCH EAST INDIES The Walraven 2 : Tzvo Pobjoy Engines DESIGNED by a Dutch aeronautical engineer, Mr. L. Walraven, and built at Bandoeng, in the Dutch East Indies, the Walraven 2 has a top speed of 156 m.p.h. and a landing speed of 40 m.p.h. It is an extremely interesting machine, and, if put into pro duction, would be suitable not only for private owners but also for business people who, piloting themselves, wish to fly at high speed with two-engine security. The designs were com pleted about a year ago, and the machine constructed during last year. It is powered with two Pobjoy '' Niagara '' engines, and is designed to have a long range —actually, 1,100 miles in still air. Two people are acconi modated, seated side by side. As can be seen from the photographs, the Walraven 2 is a low-wing, cantilever monoplane; the wings, of Got- tingen 681 aerofoil section, are constructed with boxed spruce spars and spruce two-plex plywood ribs, the whole of the wing itself being covered with plywood. The low landing speed—40 m.p.h.—is largely achieved by a flap across the trailing edge of the wing from engine to engine. The fuselage is monocoque, and of oval section. Transverse frames are interconnected by longitudinal stringers and covered with plywood. The front portion of the fuselage is built up in one piece with the wing, but the rear portion is detachable at the rear wing spar. The tail units are very clean, the tail plane being of pure canti lever construction, and the rudder and elevators of duralu min, with fabric covering. The undercarriage is cantilever, ful'v faired, and has Palmer wheels and brakes. The passenger seats are side by side on sliding mountings, and behind them there is a large luggage compartment, while there is also space for luggage in the nose. The Walraven 2 suggests the "Comet," though actually it was designed earlier. This machine has been designed and manufactured throughout to conform to the Dutch East Indies Govern ment requirements, and was constructed for Mr. Khom Kke Hien, a young Chinese. Span ... Length Height... Wing area DIMENSIONS WEIGHTS ANH LOADINGS. Weight empty... Pilot and passenger Fuel and oil ... Baggage Weight loaded Wing loading ... Power loading... PERFORMANCE Max. speed Cruising speed Landing speed (with flap) Range Ceiling 00 one engine 36.1ft. 25.6ft. 7.05ft. 190 sq. ft. 1,380 lb. 3401b. 606 1b. 103 lb. 2,42Wlb. 11.31b.,sq.ft. 13.51b.,h.p. 156 m.p-h. 137m.p.h. 40 m.p.h. 1,100 mile* 8,000 feet. GREAT BRITAIN'S CIVIL AEROPLANES A Comprehensive Official Analysis of Machines Registered ACOMPREHENSIVE analysis of all aeroplanes carrying British registration letters (but excluding those of the Dominions and Colonies) has recently been issued by the Air Ministry, and is reproduced on the next page. The resulting table embodies a number of most interest ing details, which will undoubtedly come as surprises to many people. The table has been reproduced as issued, and it will be seen to include a number of aeroplanes tabulated as registered but not airworthy. In many cases this means that the registration letters have never been cancelled, although the machines in question have long ceased to exist, and it is for that reason that a number of very old types are seen in the list. Other differences between the number of those registered and the number of those airworthy can be accounted for by those machines which are registered and may be either under overhaul or construction, and so do not possess a current C. of A. The grand total of 937 machines which were airwortny on December 31 last is divided into 101 different types. Of the 80 machines in use on regular air transport there are 20 different types, the highest number of any one typ being 20 D.H. "Dragons," then-there is a very W drop to nine D.H. four-engined " expresses," followed ) eight Handley Page 42's. The total of those used 0 taxi work, joy riding, and miscellaneous air work is<Jr> the highest number of any one type in this cattf^) being thirty Avro 504 K's, followed by twenty-one V-'• "Tox Moths." a„d There are 153 machines in use for school v\orK training, the predominating type being twenty-seven • " Tiger Moths " and twenty-five D.H. " Moths." t°M by nineteen Blackburn B.2 trainers, and sixteen " Cadets." ,. $ The clubs among them possess ninety-five aJfpfa^jj top score being sixtv-eight D.H. " Moths," after
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