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Human-powered aircraft
A human-powered aircraft (HPA) is an aircraft belonging to the class of vehicles known as human-powered vehicles. Early attempts at human-powered flight were unsuccessful because of the difficulty of achieving the high power-to-weight ratio. Prototypes often used ornithopter principles which were not only too heavy to meet this requirement but aerodynamically unsatisfactory.
As of 2008, human-powered aircraft have been successfully flown over considerable distances. However, they are primarily constructed as engineering challenges rather than for any kind of recreational or utilitarian purpose.
==The Royal Aeronautical Society Human Powered Flight Group==
The Royal Aeronautical Society's "Man Powered Aircraft Group" was formed in 1959 by the members of the Man Powered Group of the College of Aeronautics at Cranfield when they were invited to join the Society. Its title was changed from "Man" to "Human" in 1988 because of the many successful flights made by female pilots.
Under the auspices of the Society, in 1959 the industrialist Henry Kremer offered the first Kremer Prizes of £5,000 for the first human-powered aircraft to fly a figure-of-eight course round two markers half-a-mile apart. It was conditional that the designer, entrant pilot, place of construction and flight must all be British.
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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