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amphibious helicopter
An amphibious helicopter is a helicopter that is intended to rest and take off from both land and water. Amphibious helicopters are used for a variety of specialized purposes including air-sea rescue, marine salvage and oceanography, in addition to other tasks that can be accomplished with any non-amphibious helicopter. An amphibious helicopter can be designed with a waterproof or water-resistant hull like a flying boat or it can be fitted with utility floats in the same manner as a floatplane.〔McGowan, 2005, pp. 68, 84, 160.〕
==Development==
Helicopters have taken a primary role in air-sea rescue since their introduction in the 1940s.〔Evans, 2003, p. 264.〕 Helicopters can fly in rougher weather than fixed-wing aircraft, and they can deliver injured passengers directly to hospitals or other emergency facilities. A practical amphibious helicopter first appeared in 1941〔 and the water-landing feature soon proved its worth. Non-amphibious helicopters were required to hover above the scene of a water accident and utilize a hoist but amphibious helicopters were capable of setting down on the water to effect a rescue more directly.〔Ostrom, 2004, p. 186.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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