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Berkshire Concept 70
The Berkshire Concept 70, sometimes called simply the C-70, is an American, single seat, high-wing, 15 metre class competition glider that was designed by Arthur Zimmermann and produced by the Berkshire Manufacturing Corporation of Lake Swannanoa, New Jersey between 1971 and 1974.〔Said, Bob: ''1983 Sailplane Directory, Soaring Magazine'', page 11. Soaring Society of America, November 1983. USPS 499-920〕
==Design and development==
The Concept 70 was intended to be a domestic US fiberglass sailplane that would compete with the best European 15 metre aircraft being produced in the late 1960s. The company started out as a fiberglass aircraft repair shop started by Zimmermann and Wolfgang Schaer, but quickly progressed to aircraft design and construction.〔〔
The aircraft is made from molded fiberglass, with an internal fuselage steel frame skeleton that connects the monowheel landing gear, wing fittings and provides a protective cockpit cage for improved impact survivability. The prototype has an Eppler airfoil and an all-flying horizontal stabilator. Production aircraft featured a Wortmann airfoil, a more conventional tail, and full-span flaps that deploy to 90° for glidepath control. The flaps permit very steep approaches, allowing the aircraft to be landed in small fields with obstacles. The aircraft also has retractable landing gear and was available with optional water ballast tanks with a capacity.〔〔
Production of the Concept 70 ended with 21 produced, when Zimmermann died in 1974. The aircraft was never type certified and all aircraft were registered as experimental aircraft in the ''Racing/Exhibition'' category.〔〔
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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