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Aviation History
1954
1954 - 0673.PDF
McDonnell XV-1. (Above) McDonnell XV-J. (Se/ow) Piasecki HUP-2. R-975-34 engine of 525 h.p., whereas the HUP-2 has the 550 h.p. Continental R-975-42 engine and an automatic pilot as the primary controller. This fitment has enabled the lateral tail stabilizers of the HUP-1 to be abandoned. The HUP-2 serves for anti submarine, rescue and general utility duties. An improvement on this model is the HUP-3, and the H-25A is the U.S. Army version of this last-named machine, developed primarily as a close-support transport and likewise having the R-975-42 engine. The following description relates specifically to the H-25A but in general is valid for the other models. Of typical Piasecki lay out in having tandem rotors driven by a single engine, it is a six-seater, with a fuselage of all-metal, stressed-skin construction. Dual hydraulic controls are fitted, and there is a large rescue hatch (48in long x 26in wide) at the forward end of the cabin in the right-hand side of the floor, near the pilot's seat. An hydraulic hoist permits personnel, stretchers, etc., up to 400 lb in weight to be lifted through the hatch. The engine is fan-cooled and readily removable as a power package, including accessories and lubri cating system. Data are: rotor diam., 35ft; fuselage length, 32ft; weight empty, 3,928 lb; normal gross weight, 5,750 lb; overload gross weight, 6,100 lb; max. speed at s.l. (rated power), over 103 m.p.h.; cruising speed, over 80 m.p.h.; service ceiling, over 10,000ft; vertical rate of climb (take-off power), 650 ft/min; max. range, about 340 nautical miles; fuel capacity, 125 gal. SIKORSKY S-57 • A convertiplane being built to U.S.A.F./ U.S. Army specifications, and possibly designated XV-2, this is believed to have a two-blade rotor which can be braked and retracted into the main fuselage during forward flight. Gasiturbine power is almost a certainty. SIKORSKY S-S2-2 • This fast 3/4-seat helicopter, little known outside America, was described in our previous review, but it can now be recorded that a machine of the type has flown under the power of a Turbomeca Artouste II shaft-drive gas tur bine. This French-built power unit is mounted at the top of the fuselage directly beneath the rotor head. Piasecki HUP-2. •or
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