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Aviation History
1954
1954 - 0672.PDF
IK ...i m—m— 302 Kaman HTK-1. Kaman HOK-1. Kaman HTK-1. Helicopters 1954 . . . power plant section, from which the engine can be rapidly removed without recourse to hoisting equipment, is the cabin, to the rear of which is stowage for baggage. The rotor blades are interchangeable and each has a spar built up of plastic-bonded birch laminations, with a plastic-bonded mahogany plywood covering. On each side of the fuselage is a 7ft-wide folding door, which affords rapid loading of patients in safety and comfort—an im portant factor in helicopter rescue. When two stretcher patients are carried the retrieving radius is 240 miles, and the spacious cabin—of 147 cu ft capacity—allows an attendant to be carried. A projected development will have two 200 h.p. Boeing Model 502 turboprops, which will permit a useful load of 2,140 lb to be carried at speeds up to 90 m.pi. Leading data for the YH-31 are: main rotor diam., 48ft; fuselage,.length, 38ft; disc area, 1,810 sq ft; disc loading, 2.44 lb/sq ft; empty weight, 2,860 lb; gross weight, 4,419 lb. GYRODYNE GCA-2C • Powered with a Pratt and Whitney Wasp Junior engine of 450 h.p., this six-seat, two-blade, co-axial helicopter was being evaluated last year under a contract from the U.S. Navy. The rotors are of the semi-rigid type and incorporate automatic locks which prevent them from flapping at low rotor speeds and permit operation in high winds. There are only five gears in the transmission system. Data are: rotor diam., 48ft; weight empty, 3,800 lb; gross weight, 5,400 lb; disc loading, 2.98 lb/sq ft; max. speed, 110 m.pi.; hovering ceiling (wiuiout ground cushion) 5,900ft; vertical rate of climb, 625 ft/min. KAMAN HTK-1 • This training and utility helicopter for the U.S.' Navy and Marine Corps is a development of the com mercial Type K-225, but has rotors of increased diameter and horizontal tail surfaces connected to the collective pitch control for greater stability. The engine, a Lycoming 0-435 of 235 h.p., drives twin two-blade intermeshing rotors mounted on splayed- out shafts. As an ambulance the HTK-1 carries a stretcher case and attendant or two "sitting" cases in the fuselage and two addi tional stretcher cases in external litters. The rotor diameter is 40ft and the fuselage length 20ft 6in. KAMAN HOK-1 • A four-seater liaison helicopter now in production for the U.S. Navy, the HOK-1 has twin two-blade intermeshing rotors as has the HTK-1, but differs in a number of important respects, notably in that it has twin tail booms. In the liaison role the HOK-1 will carry four people but it is convertible to an ambulance, when it will take two stretcher patients and one sitting patient or an orderly in addition to the pilot. The engine is a Continental R-975-40 of 500 h.p. and is mounted at the rear end of the fuselage at an angle of 35 deg. The gross weight is about 3,500 lb. As on odier Kaman types, blade-pitch is controlled by servo-flaps. McDONNELL XV-1 • One of the most notable designs of the past year, die XV-1 is a high-wing monoplane with twin-boom tail, wings of 26ft span and a skid undercarriage. The engine is a Continental radial of 550 h.p., driving a McCauley pusher propeller and a blower which supplies air under pressure to rotor-tip jets. When the rotor is operating the propeller is braked and feathered, and when forward speed is desired a clutch dis engages the engine from the blower and switches its power to the propeller. According to Aviation Week, fuel is fed to the tip jets through a rotor fuel governor driven from the rotor hub accessory drive. The undercarriage skids are of aluminium and contain stainless steel straps on the "bungee" principle to absorb the shocks of unusually heavy landings. PIASECKIPD-18 RETRIEVER (HUP and H-2SA) • Under the maker's designation PD-18, a family of U.S. Navy and U.S. Army helicopters has grown up. The symbols HUP signify U.S. Navy and H-25 denotes U.S. Army. The U.S. Army models are known by the name Army Mule. The HUP-1, the first production model, has the Continental
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