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Aviation History
1958
1958 - 0385.PDF
21 March 1958 401 Helicopters of the World ... Transcendental Aircraft Corporation Glen Riddle, Pennsylvania.Model 2 The Transcendental Model 2 has a three-blade rotor attached at eachend of its fixed high wing. These rotors can be tilted for horizontal or vertical flight.The engine is a Lycoming O-435-23 of 250 h.p., and provision is made for a crewof two. • Rotor diam., 17ft; empty weight, 1,600 lbapprox.; weight loaded, 2,250 1b approx. Vertol Aircraft Corporation Morton, Pennsylvania.H-21 Designated by the U.S. Army as the Shawnee, the H-21 continues in pro-duction and has been developed into the Vertol Model 44 for civilian use. TheWright R-1820-103 piston engine is fitted. The H-21 is also widely used by theU.S.A.F. In recent months work has been con-ducted by the U.S. Army in the arming of helicopters, and a standard H-21 has beenequipped for laying down suppressive fire by installing a bracket on the under-carriage which carries two 0.30in and two 0.50in guns as well as several differentrocket combinations. The initial installa- tion mounted eight 3.75in Oerlikon rockets;a later installation substituted two rocket pods, each containing seven 2.5in rockets.In addition, this aircraft was also equipped with an easily removable 0.30in gunmounted in the main cabin doorway, and reinforced rifle ports for each of the cabinwindows. • Rotor diam., 44ft; overall length, 86ft 4in;empty weight, 8,600 lb; normal gross weight, 13,300 1b; max. gross weight, 15,000 lb; max.speed, 140 m.p.h.; hovering ceiling in ground effect, 6,100ft; normal range, 400 miles. H-21 (Turbine Developments) Two H-21 shave been modified for turbine power. One, known as the H-21D, is a standard Armyhelicopter having two General Electric T58 Vertol H-21. turboshaft engines and has been developedunder contract with the U.S. Army and the Navy Bureau of Aeronautics. Thesecond, called the Vertol 105, has two Lycoming T53 turboshaft engines, and isowned by the Vertol Aircraft Corporation itself. Vertol's vice president is on recordas saying that the twin turbines give the H-21 a 40 per cent increase in payload andan increase in speed of 50 m.p.h. This means, he said, that the aircraft could dotwice as much work in a given period of time. The engine installation in the Model (Below and right) Vertol 44.
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