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Aviation History
1953
1953 - 0119.PDF
FLIGHT, 23 January 1953 117 KELLETT PROJECT • The Kellett Aircraft Corporation, of Central Airport, Camden, n, New Jersey, was responsible for the design of the Hughes XH-17 and is engaged on studies for new types of large transport helicopters. McDONNELL PROJECT • Builders of the world's first twin-engined helicopter—the XHJD-i—the McDonnell company is now working on the XHRH-i transport helicopter for the U.S. Navy, the HCH-i flying crane for the U.S. Marine Corps, and the XL-25 convertiplane for the U.S.A.F. PIASECKI RESCUER • The Piasecki Helicopter Corpora tion is famed for its tandem-rotored transport helicopters, and Bell XHSL-1. PIASECKI XH-16 • This highly promising large helicopter is being built to the order of the U.S.A.F. It is a tandem-rotor rescue and utility transport with an all-metal stressed-skin mono- coque fuselage, and may be considered as a development of the PD-18 Retriever, which it resembles in appearance, except that the relative length is much greater. In size the XH-i6's fuselage will compare with that of a Douglas Skymaster, and in addition, a special tall undercarriage can be supplied which, by permitting the installation of a large detachable "pack," will almost double the payload and allow "truck trailer" operation. An integral ramp in the forward end of the pack will swing down to permit quick load ing or unloading of military equipment and supplies. The first XH-16 is to be powered with two Pratt and Whitney Double Wasp engines, but a version with Allison turboprops has also been studied. Various civil developments are foreseen, one of which is illustrated in a drawing below. Bell H-12. the Rescuer (U.S. Navy HRP-i and HRP-2) was the first machine of this class put into production by the company. In both the variants mentioned the engine is a Pratt and Whitney Wasp, but the "-2" has a redesigned fuselage and other modifications. Rotor diam., 41ft; weight empty, 5,300 lb; weight loaded, 7,225 lb; cruising speed, 92 m.p.h. PIASECKI PD-22 WORK-HORSE • This large tandem- rotor machine is a development of the Rescuer, with higher power and generally of more refined design. Four versions have been developed—the YH-21 and H-21A rescue and utility machines, H-21B troop and cargo transport, and the H-21C, a special trooper/freighter version of the H-21B to the particular requirements of the U.S. Army. All variants are powered by the Wright R-1820 Cyclone, with a take-off rating of 1,425 h.p. Cabin dimensions are: 20ft long by 5ft 6in wide by 5ft 6in high, giving a capacity of 615 cu ft. This is sufficient to take 12 stretchers or 14 troop seats. In addition to the main entrance door, at the end of the cabin there is a rescue door, with appropriate facilities, including a swinging boom rescue hoist, immediately behind the pilot. The fixed-wheel undercarriage has provision for the installa tion of flotation gear to permit swamp or water landing. Complete winterization equipment is embodied for rescue and other opera tion in Arctic regions. The fuselage is of all-metal stressed-skin monocoque construc tion, and the cockpit has side-by-side searing for two pilots (first pilot to starboard), with complete dual controls in addition to an automatic pilot. Rotor diam., 44ft; max. speed, 125 m.p.h.; service ceiling, over 16,000ft; overload gross weight, above 14,000 lb. Westland-Sikorsky S-55. Piasecki XH-16 (possible civil development).
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