The Illustrated History of Helicopters by Michael Heatley PDF

By Michael Heatley

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The system attempted to combine two important functions in ensuring the not safety of US Navy surface vessels: anti- submarine warfare (ASW) and anti-ship surveillance and targeting (ASST). Its 'lightweight' prefix indicated operation from small vessels of the frigate, destroyer and cruiser classes, with ship-to-helicopter communications of paramount importance. niiiJiti Left: Kaman's Seasprite has enjoyed two decades of service with the US Navy. TheSH-2F version pictured service's fulfilled that demanding LAMPS specification.

It was, however, significantly larger, with a 14passenger capacity, and its 1700 hp Shvetsov ASh-82V piston engine - considerably more powerful than the 800 hp Wright of production S-55s - took it to a number of international records in 1956. These included a height record of 19,843 ft (6048 m) and a speed record of 116 mph (186 km/h) over a 500 km course. The Mi-4's progress to flight-test status in only seven months had been due to Stalin's personal insistence that the Soviet Union should be able to rival the US capabilities shown by their recent operations in Korea.

Similar concepts to those of the Bell 47 had been employed in the Hughes Model 269 and the Hiller Model 360; the latter, indeed, shared the Bell 47's choice of power plant. Stanley Hiller Jr. had demonstrated his coaxial XH-44 in August 1944, developing it two years later to become the UH-4 Commuter. The Model 360, later to become more readily known by the designation UH-12, was of more conventional appearance with a main and tail rotor but was unusual in another respect. Directional control was maintained by means of an overhead 'stick' operating a control rotor projecting at right angles to the two main rotor blades with mini movable flying surfaces or 'paddles' at each end.

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The Illustrated History of Helicopters by Michael Heatley


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