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Aviation History
1956
1956 - 1573.PDF
FLIGHT, 2 November 1956 731 (Above and right) Vertol PH-42 (H-21) Work Horse. Helicopters of the World . . . R-1820 of some 1,425 h.p. A projectedcivil version has been abandoned. 9 Rotor diam., 44ft; overall length, 86ft 4in;empty weight, 8,600 lb; gross weight, 13,300 1b; overload gross weight, 15,000 lb; max. speed at s.l., 130 m.p.h.; rate of climb at s.I., l,080ft/min; range, 375 miles. Model PH-42 (with T58 gas turbines) A contract has been awarded by the NavyBureau of Aeronautics and the U.S. Army to equip two standard H-21C helicopterswith two General Electric T58 gas turbines. The payload will be increased by 40 percent and a cruising speed of about 150 m.p.h. will be possible. Hovering ceilingwill be raised by several thousand pounds and an extended warm-up period will notbe required. On an emergency mission, in fact, the turbine-powered machine couldbe in the air in less than half the time required by the standard piston-enginedversion. The two T58s will occupy less space than the single piston engine and willweigh only half as much. YH-16A The YH-16A is a turbine-powered development of the YH-16 and precursor of a proposed higher poweredproduction version, known as the YH-16B. Flight tests have demonstrated the abilityto maintain height with normal load with one of the two Allison YT38 turbines shutdown. The machine was built as part of a heavy-cargo helicopter programme call-ing for machines with a 5/7-ton capacity. Alternatively, up to 40 passengers can becarried and the YH-16B will be developed to carry 69 troops. During Decemberlast year the YH-16A attained a speed of 166 m.p.h.• Rotor diam., 82ft; overall length, 134ft; gross weight, over 32,000 lb; service ceiling,over 18,000ft. VTOL Aircraft A contract has beenplaced by the Office of Naval Research for a VTOL research aircraft of the tilt-wingtype. The single turboprop unit will be geared to two rotor-propellers mounted faroutboard on the wing. A skid-type under- carriage will be fitted. (Right) Vertol YH-16. (Below) Vertol YH-16A
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