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Stephens Akro
The Stephens Akro is a single engine monoplane designed in the United States for aerobatic competitions. It first flew in 1967 and proved vary successful, leading to several developments of which one won seven US Championships and one World Championship between 1975 and 1982. The Extra EA-230 and Extra EA-300 were also Akro developments with over two hundred built.
==Design and development==
The Akro was designed as a homebuilt aircraft for pilots who competed in aerobatic competitions. It was the first U.S. aircraft design to be guided by the Aresti Catalog of manoeuvres for such events. The structure absorbs high stresses, +12/-11g. The Akro is a cantilever mid wing monoplane with a wooden, two spar mahogany skinned wing built in one piece, its forward spar passing unbroken through the fuselage and the rear spar in two parts. The plain, statically balanced ailerons have steel spars with spruce ribs and trailing edges ; they are fabric covered and carry ground adjustable trim tabs. The tail unit is a fabric covered steel tube structure, wire braced and with swept, straight tapered surfaces. Like the ailerons, all the rear control surfaces are statically balanced. The rudder has a ground adjustable trim tab. The tailplane is mounted at the top of the fuselage, with variable incidence and a flight controllable trim tab in the elevator.〔
The Akro has a 180 hp (134 kW) Avco Lycoming AIO-360-AIA air-cooled flat-four engine in the nose, driving a two blade metal fixed pitch propeller. Its fuel is stored in a fuselage tank between the single seat cockpit and the engine. The cockpit has a fixed screen and a rearward sliding bubble canopy. In addition, there is a large window in the forward cockpit floor. There is a fixed, conventional undercarriage, with the mainwheels under glass fibre fairings on cantilever sprung steel legs. Hydraulic disc brakes are fitted. The tailwheel is steerable.〔
Two slightly different models were designed specifically for the first two customers. The Model A design, begun in July 1966 was for Margaret Ritchie, the winner of the 1966 U.S. Women's Aerobatic Championship and first flew on 27 July 1967. The Model B had less tapered wings of greater area (6%) and bigger ailerons, though of unchanged span, slightly heavier (8%) and with windows in the fuselage sides below the wings. The B also carried 16% less fuel but had a lubrication system adapted to prolonged inverted flight. It first flew on 9 July 1969.〔
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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