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Aviation History
1953
1953 - 0118.PDF
nvK riiHi fa fafajajfaLOja HI rHTHHiPi fifv fnHrnH.V w» K a HI K niHni Hint HI mum mm mmm^m mmmm £L The World's Helicopters WEIGHTS ABOVE 6,000 lb (cont.) WESTLAND-SIKORSKY S-55 • Illustrated in a sectioned drawing on page 103, the S-55 is further dealt with as a Sikorsky type. The following figures apply to the Westland-built machine, powered with a Pratt and Whitney Wasp R-1340 of 600 h.p.; rotor diam., 53ft; empty weight, 4,910 lb; gross weight, 6,800 lb; max. speed, 112 m.p.h. at 199 r.p.m.; max. weak mixture cruising speed, 86 m.p.h. at 186 r.p.m.; max. vertical rate of climb, 4Coft/min; speed for max. endurance, 60 m.p.h. at 186 r.p.m.; fuel consumption for max. range, 2.88 miles/gal; max. still-air range (150 gal), 432 miles; max. still-air range (60 gal), 173 miles; service ceiling, 13,000ft; hovering ceiling (without ground cushion), 4,900ft. WESTLAND PROJECT W.80 • Intended as a 36-seater for inter-city and feederline work, this type is likely to have two Bristol Hercules engines, mounted in outboard nacelles; their driving shafts will be mounted at right angles to the line of flight and inclined in a vertical plane towards the main gear-box above the cabin roof. A considerable amount of development work has already been undertaken in the design of the gear-box units for this type of twin-engined drive to a single rotor. The crew will com prise pilot, co-pilot and wireless operator, and the passengers' seating will be symmetrical on each side of a central gangway. Main rotor diam., 94ft; fuselage length, 69ft; volume of main cabin, 1,525 cu ft; gross weight, 24,5001b; max. cruising speed, 140 m.p.h. WESTLAND PROJECT W.85 • This design is for a 100- seater military helicopter, powered by six Armstrong Siddeley Adder gas turbines (or similar) mounted two on each blade tip. Various load conditions have been studied, including the follow ing: (1) tank or self-propelled gun transport; (2) troop transport; (3) artillery transport. In the last-named case, the solution for which is shown in our drawing, the following figures are quoted, weight unloaded, 20,7001b; pilot, co-pilot, navigator, flight engineer, 600 lb; three jeeps, 7,050 lb; three 25 lb guns, 12,100 lb; 150 rounds of ammunition, 5,2501b; 18 gun-crew, 3,2401b; 500 gal fuel, 4,060 lb; normal all-up weight, 53,000 lb; overload all-up weight, 60,000 lb. The main rotor diameter is 104ft; cabin capacity, 4,400 cu ft; max. seating capacity, 102 troops. WESTLAND PROJECT W.90 • This design is for a 450- seater military helicopter with an Armstrong Siddeley Sapphire turbojet on each blade tip. Schemes have been prepared for the following roles: (1) general utility transport; (2) tank transport; (3) artillery transport; (4) troop transport. In the general utility case the weight empty is 92,000 lb; crew of four, 800 lb; 4,000 gal of fuel, 32,100 lb; six jeeps, 14,100 lb; 220 troops, 39,600 lb; one truck or tractor, 9,480 lb; eight-ton container, 17,920 lb; all-up weight, 2o6,ooolb. With the fuel tankage quoted the still-air range is reckoned to be 230 miles. Other particulars are: main rotor diam., 196ft; length of fuselage, 124ft; volume of main cabin, 30,500 cu ft. Gyrodyne CCA. 3 Helidyne. Westland Project W.90. Westland Project W.85. Westland Project W.80. BELL MODEL 48 • In essentials this machine (which bears the U.S.A.F. designation YH-12B) is a scaled-up development of the Model 47 previously described. A small quantity has been delivered to the U.S.A.F., to the order of which Service the type was originally developed. The engine is a Pratt and Whitney Wasp R-1340-55 and the aircraft, which normally carries a crew of two and five passengers, is suitable for rescue, freighting, assault or evacuation work. Rotor diam., 47ft 6in; weight empty, 4,200 lb; gross weight, 6,600 lb; max. speed, 105 m.p.h. at sea level; cruising speed, 85 m.p.h.; max. rate of climb, i,oooft/min; range, 300-400 miles. BELL MODEL 61 • Known to the U.S. Navy as the XHSL-i, this large tandem-rotored machine is intended for specialized anti-submarine operation. The rotors are of the Bell rigid two-blade type, with automatic stabilizing bar, and are driven by a Pratt and Whitney Double Wasp engine. BELL MODEL 200 • Bearing this designation, a converti- plane with a Pratt and Whitney Double Wasp engine is under development. GYRODYNE G.C.A. 3 HELIDYNE • A crew of two, and 16 troops or 12 stretcher cases, are possible leads for this projected Gyrodyne. The engines, disposed as shown in the accompanying drawings, are Pratt and Whitney Wasps, and it is estimated that they will give a maximum speed of 170 m.p.h. The rotor diameter is 52ft, and empty and gross weights, 6,000 and 11,000 lb respectively. HILLER PROJECT • A project for a 40/50-passenger ram jet transport helicopter by the Hiller company has two main rotor blades, small stub wings and a biplane tail. The entry door is amidships. HUGHES XH-17 • The world's largest helicopter, this is a product of the Hughes Aircraft Company, Florence Avenue at Teale Street, Culver City, California. Originally built as a ground- test model under a development contract with the U.S.A.F. Air Research and Development Command, the machine was later con verted into a flight model following satisfactory tests of the jet- powered rotor system. The present prototype is expected to be the forerunner of huge cargo-carrying developments capable of lifting and delivering artillery, bridge sections, lorries, etc., to inaccessible areas. The two-blade main rotor measures over 125ft; and the craft stands more than 30ft high. Power is provided by two modified General Electric J-35 turbojets supplying gas pressure through ducts leading up the rotor shaft and out to burners at the blade tips. An unconfirmed designation for a development of the XH-I7, for use as a flying crane, is XH-28.
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