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Solar-Powered Aircraft Developments Solar One
The Solar-Powered Aircraft Developments Solar One is a British mid-wing, experimental, manned solar-powered aircraft that was designed by David Williams and produced by Solar-Powered Aircraft Developments under the direction of Freddie To and first flown on 19 December 1978. It was the third solar-powered aircraft to fly, after the unmanned AstroFlight Sunrise and the manned Mauro Solar Riser.
==Design and development==
Freddie To was a member of the Kremer prize committee who started a project to produce a human-powered aircraft to compete for the prize. The resulting aircraft, at , proved too heavy for human-powered flight and so was converted to solar power instead. A nose-mounted pod powerplant was installed consisting of four permanent magnet 36 volt DC, 12 amp Bosch electric motors, powered by 750 solar cells of 3 inch diameter and a Nickel-cadmium battery pack of 24 cells with a 25 amp hour capacity, connected in series. The motors are connected by a 3:1 bicycle chain reduction drive to a wooden two-bladed propeller, which turns at a maximum of 1,100 rpm, decreasing with battery discharge. The engines are controlled with a simple on/off switch. For flight the aircraft used its on-board solar cells to recharge the battery array on the ground and then the batteries provided power for flight as the aircraft had insufficient solar cells for sustained flight. This shortcoming was not a design feature, but a problem of the cost of the solar cells as the limited project budget of £16,000 did not allow the purchase of sufficient cells. The 750 installed solar cells cost £6,000 and were the most expensive part of the aircraft.〔〔〔
The Solar One is constructed of a wooden structure covered with heat-shrunk Solarfilm model aircraft covering. The wing was built in three sections, a centre section and two outer wing panels to simply storage and transport. The wing spar is a laminated spruce girder box-spar design. The tail surfaces are quickly removable for storage.〔
The installed batteries provide for a climb of eight minutes plus a two-minute cruise allowance.〔
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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