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The Johnson RHJ-6 Adastra (English: ''Star'') was an American mid-wing, two-seat glider that was designed and constructed by Dick Johnson and first flown on 3 April 1960. ==Design and development== The Adastra was conceived by Johnson as a two-place competition aircraft. He completed and flew it in 1960.〔 The aircraft was of mixed construction. The fuselage was built from wood and was a monocoque design. The wing had a wooden structure, with fiberglass leading edge. The tail surfaces were constructed of wood. The wings aft of the leading edge, the tail surfaces and all control surfaces were covered with doped aircraft fabric.〔 Originally the aircraft employed an Eppler 150 airfoil section, but Johnson later modified it by adding a 10% wing chord extension, turning the airfoil into an Eppler 151. Later new wings were built with an Eppler 414 airfoil to improve low-speed performance. The new wings used a foam-filled fiberglass leading edge. The tail was originally a "Y" tail, but this was later replaced with a conventional tail, with a low-mounted tailplane.〔 The individual cockpits were covered with independent bubble canopies, although the aircraft was most often flown solo, with a flat hatch replacing the rear canopy to reduce aerodynamic drag. In 1983 it was reported that a single canopy was being designed for the aircraft.〔 Only one Adastra was built.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Johnson RHJ-6 Adastra」の詳細全文を読む スポンサード リンク
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