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Oldershaw O-3
The Oldershaw O-3 is an American high-wing, single seat, V-tailed glider that was designed by Vernon Oldershaw. Two examples were constructed as gliders and then both were later converted to motor gliders.〔Said, Bob: ''1983 Sailplane Directory, Soaring Magazine'', page 51. Soaring Society of America November 1983. USPS 499-920〕
==Design and development==
The O-3 was designed by Oldershaw as an improved version of the O-2 to complete in the FAI Open Class. As such it had longer and higher aspect ratio wings of span.〔〔
The O-3 is constructed of wood, with the nose made from fibreglass. Its wing employs a Wortmann 61-184 airfoil at the wing root, with a Wortmann 60-126 at the wing tip. The wing is equipped with trailing edge dive brakes. The landing gear is a retractable monowheel.〔〔
Both aircraft were constructed as pure gliders and then later motorized with the addition of a twin-cylinder, in-line Yamaha snowmobile engine. The engine is mounted behind the wing spar on a pylon that retracts forward into a bay closed by two doors. The power is transmitted through a belt-drive to a two-bladed propeller. The pylon can be deployed in eight seconds and uses the electric motor from a Ford Thunderbird window winder. The Yamaha powerplant gives a take-off roll of at an elevation of and produces a climb rate of .〔〔
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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