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Aviation History
1954
1954 - 0668.PDF
298 FLIGHT port for U.S. Marine Corps; HRS-4, Wright R-1820 engine, assault transport for U.S. Marine Corps. SIKORSKY S-S6 (XHR2S) • The XHR2S is an assault helicopter for the U.S. Marine Corps and is a twin-engined, single-rotor machine comparable in size to the Douglas Dakota. It is the first helicopter in the world to have a retractable under carriage. The engines are Pratt and Whitney R-2800 Double Wasps, and they are mounted outboard of the fuselage on stub wings; power from both is transmitted to the five-blade main rotor and to the tail rotor, each of which folds for stowage aboard aircraft carriers. The fuselage has nose-opening doors and will carry two combat assault squads, i.e., about 26 fully equipped men. Speed is "over 150 m.p.h." Sikorsky S-S5. (Above and bottom right) Sikorsky XHR2S. Helicopters 1954 . . . nearly 78ft long—about the size of a Convair 240's—and has capacity for 40 troops, 32 stretcher patients or three jeeps. Whereas the former Piasecki twin-rotor helicopters had only a single engine, the YH-16 is powered with two Pratt and Whitney R-2180 units of 1,650 h.p. each. A later version, designated YH-16A, will have two Allison turboprops of the T38 class. Estimated performance figures have not been divulged, but the speed will be higher than that of the H-21, which last year set up a world speed record of 146.7 m.p.h. Provision is made for a cargo "pack" to be slung beneath the fuselage, and when this is fitted a special tall undercarriage, which raises the fuselage about 10ft off the ground, is required. In addition to the normal door at the forward end of the cabin, the YH-16 has a ramp at the rear which can be lowered for the fast loading and unloading of vehicles, guns, cargo, per sonnel or patients. Outside the forward cabin door is a cable hoist, operated by the pilot. Versions of the turbine-powered YH-16 will be laid out for commercial service and will seat from 48 to 72 passengers. It is said to be possible in the YH-16 to place the load any where in the cabin, for the machine has a larger centre of gravity travel than any other aircraft, including the Brabazon-size Con vair B-36 bomber. SIKORSKY S-SS • The basic S-55 has already been fully described under Westland-Sikorsky, but it must be noted here that the American parent company is continuing to turn out this machine for a variety of purposes. The principal variants are: H-19A, Pratt and Whitney R-1340-57 engine, troop carrier or ambulance for the U.S.A.F.; H-19B, Wright R-1300-3 engine, for similar duties with the U.S.A.F.; H-19C, as H-19A but for the U.S. Army; H-19D, as H-19B but for the U.S. Army; H04S-1 and -2, Pratt and Whitney R-1340 engine, for anti-submarine work with the U.S. Navy; H04S-2G, similar to H04S-2 but fitted for Coastguard rescue duties; H04S-3, Wright R-1300 engine, for anti-submarine duties with the U.S. Navy; HRS-1 and -2, Pratt and Whitney R-1340 engine, assault transport for U.S. Marine Corps; HRS-3, Wright R-1300 engine, assault trans- Unofficially it is reported that the rotor is designed to retain a high measure of efficiency should one blade be shot away, and the tailplane should make for added stability. The assault version has nylon flak curtains and can carry, as an alternative to its load of troops, a 105 mm gun or 5,500 lb of cargo. Commercial developments are foreseen and should lift up to 35 passengers over ranges of more than 200 miles. SIKORSKY S-58 • A development of the S-55, this machine will be available as a 20-passenger civil aircraft (or a freighter carrying 1J tons), or in various military forms. The U.S. Navy version will be designated HSS-1 and will be used for anti-submarine work. In the U.S. Army it will be known as the H-34 and in the U.S. Marine Corps as the HUS-1.
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