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Aviation History
1953
1953 - 1014.PDF
i68 FLIGHT, 7 August 1953 side. The run is estimated at about 4,000ft. Landing is made at some 100 m.p.h., lightly loaded, and takes half this distance. It is reported that taxying stability is enhanced by the fact that the Sea Dart banks when turning on the water. Convair XP^Y. It is now known that the cause of the loss of this prototype Flight, July 31st last) was an in-flight failure of the tailplane trimming system. At about 3 p.m. on July 15th, the big flying boat was off the Californian coast when it began to develop very severe pitching oscillations. After nearly half an hour of steep dives and climbs—during which time the structure remained sound and the four Allison T40 double turbo- props continued to run—the aircraft was abandoned. Shortly after the crew of nine had bailed out, the XP5Y went steeply into the sea. Most of its uncontrolled gyrations were filmed by a chase-plane which had originally taken off to accompany a test flight of the XF2Y Sea Dart. It is understood that production of the R3Y Tradewind transport (of which the XP5Y was a prototype) will continue. Doman YH-31. Doman Helicopters, Inc., are the patentees of a very neat hingeless rotor, which was originally tested five years ago in a Sikorsky R-6. They have been developing their own helicopters for several years, and received a contract for a small series of YH-31 cas.evac. aircraft, the first of which is shown on this page. Powered by a 400 h.p. Lycoming flat-six engine mounted in an inclined position, the YH-31 has accom modation for four stretchers and a medical attendant. As a civil, multi-purpose, air craft, it is styled LZ-5. At present there are signs that production of the H-31 may be undertaken on a large scale, for a con tract has been awarded to Hillers (who have a larger factory) to build the Doman helicopter under licence. Doman are now developing an enlarged variant powered by two 200 h.p. Boeing Model 502 turboprops. AIRCRAFT INTELLIGENCE AIRRORNE with eight aboard is the prototype Doman YH-31. This aircraft has 7ft-wide folding freight doors and is in production for the U.S. Army Transportation Corps. The Lycoming engine is mounted under the nose. The YH-31 is referred to in an item on this page. Great Britain D.H. 2-seat Venom. The Chester factory of de Havilland is now engaged in the mass- production of a number of types of two- seat Venom fighter. At present, the only squadrons of Venoms are those equipped with the single-seat FB.I. Principal pro duction types are the NF.2 and 3, both of which have the new clear-vision frameless canopy and the extended dorsal tail fins. Also being delivered are Sea Venom NF.20S for the Fleet Air Arm; these have a rather ungraceful shape of rudder (illus trated, on a French-built Sea Venom, on p. 17 of our issue of July 3rd last). U.S.A. Convair XF2Y-1 Sea Dart. This delta- wing, hydroski fighter prototype was recently demonstrated in public at San Diego Bay. It appears that the little midnight-blue craft is fitted with wheels at the rear ends of its skis and under the aft hull, upon which it can move down a ramp into the water. Once launched, the water line rises to the level of the wing leading edge, with the skis well submerged. But when the two J34S are opened up and the craft begins to move, it very quickly rides up on the skis, which send a wide bow-wave just under the wing on each
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