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Aviation History
1956
1956 - 0753.PDF
8 June 1956 753 Sikorsky HR2S. Piasecki YH-16A Turbo Transporter. "assault transport," it is powered by two Pratt and Whitney R-2800-99Wengines of some 2,500 h.p. each and has a gross weight of over 50,000 lb. Range is 850 miles with a payload of 16,000 1b. With a crew of two itis capable of air-lifting and landing 61 combat troops and their equip- ment; or it can carry 50 stretcher patients, six "ambulatory or walkingpatients," five nurses, and more than 1,300 1b of equipment on casualty evacuation nights. Other typical loads are: a 2J-ton 6x6 truck, twomen, and 3,750 lb of equipment; a IJ-ton truck, two men, and 5,000 lb; two J-ton trucks, four men, and 3,400 lb; or four J-ton jeeps, fourmen, and 4,550 lb. When artillery is required by assault forces, the C-123B can fly in andunload such ordnance as a 155 mm howitzer, 19 rounds of ammunition, and 1,300 lb of miscellaneous equipment; a 105 mm howitzer, a |-tonweapons carrier, six men, and 90 rounds; or a 90 mm howitzer, 90 rounds, and 6,000 lb. Four external tanks carry the entire fuel load and reduce fire dangerin that they can be jettisoned for an assault landing or in a like emergency. Studies have been made for turboprop powerplants and flight testshave been conducted with two Fairchild J44 turbojet units, each of 1,000 1b thrust. With this augmented power, and with one enginefeathered on take-off, the rate of climb has been increased from 150ft/min to _500ft/min. Interest has also been shown in the use of a Continental-built Turbomeca Aspin II ducted fan for use as an air pump to feed a boundary layer control system.Span, 110ft; length, 76ft. Stroukoff YC-123F Pantobase This development of the basic C-123design has a sealed hull for flotation and two sturdy skis, for land or water use, extensible from the hull bottom. The normal retractableland undercarriage is fitted, and there are outboard stabilizing floats. For water operation the skis are lowered and, by virtue of lateral aerofoils,surface at about 20 m.p.h. Notwithstanding the numerous modifications and additions, cruising speed is given as 179 m.p.h. The YC-123F hastaken off from an ice-and-snow runway at a weight of 55,165 lb. The previous "record" for unassisted ski take-off was held by a LockheedNeptune, at 52,800 lb. Lockheed C-130A Hercules Since our previous review new facts have been disclosed concerning this remarkable machine. Classed by the U.S.A.F. as a "medium combat transport," it is powered by four AllisonT56-A-1 turboprops, has a design gross weight (load factor 3) of 108,000 1b, or an "alternate gross weight" (load factor 2.5) of 124,200 1b.Take-off thrust can be augmented by eight Aerojet 15KS-1000 rockets, giving a total of 8,000 lb thrust for 15 seconds' duration. The maincargo compartment is 41.45ft long, 10.25ft wide, and 9.1ft high, and corresponding dimensions for the main loading door are 10ft, 9.2ft,and 3.4ft. The normal crew numbers four and alternative to 92 troops, 64paratroops, or 70 stretcher cases plus attendants can be accommodated. Features include integral ramp and cargo door; crew- and cargo-com-partment pressurization; ground and in-flight air-conditioning; thermal de-icing system for wing and empennage leading-edges; armour pro-tection against small-arms fire for pilot, co-pilot and engine nacelles; single-point refuelling; E-4 autopilot; provision for rearward-faringpassenger seats; provision for "push-button spot drops of up to 25,000 1b supplies"; and an airstream deflector for para trooping. It is known that a "pantobased" version—suitable for operation fromwater, land, mud, ice or snow-—is under development. Full performance figures have not been made known, but the Herculesis said to take off with a 20-ton load in 12 seconds, or, at an all-up weight of 110,000 lb, "in twelve times its own length."Span, 132.6ft; length, 9S.2ft. Piasecki YH-16A Turbo Transporter This great helicopter, withtwo Allison YT38-A-3 turboprops, is the prototype of the YH-16B, which is intended as the production version, though its future is atpresent in doubt. The YH-16A weighs over 16 tons and has been paced by a fixed-wing aircraf at a speed of 166 m.p.h.Sikorsky HR2S-1 The production version of this assault helicopter, designed primarily for the Marine Corps but also to be used by theU.S. Army under the designation H-37A, differs from the prototype in having twin main wheels, improved cooling, a slab tailplane and fairedrotor head. It was designed to carry two Marine squads (26 men) or two jeeps plus crews. Gross weight is between 28,000 and 30,000 1b,and top speed, with two Pratt and Whitney R-2800 piston engines derated to 1,900 h.p. each, is between 150 and 160 m.p.h. Developedmodels will have Allison turboprops. Boeing B-52 refuelling by the flying-boom method from the Type 707 (precursor of the KC-135). __
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