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The experimental Hirth Hi-25 Kria was only the second glider constructed from glass reinforced plastic (GRP). Built in Germany in 1958, it was a single seat, span aircraft. Only one was built; it later flew for several years with Akaflieg Stuttgart. ==Design and development== The first glider with a GRP structure was the Akaflieg Stuttgart Phönix which flew in November 1957. Wolf Hirth had followed its construction with interest and had hoped to manufacture it. Instead, the Phönix was produced by Bölkow and Hirth built his own design, the Hi-25 Kria, using the construction methods developed for the Phönix. As well as their structural similarity, the Kria and the Phönix shared some aerodynamic features, particularly Eppler airfoils and fuselages which conformed to the upward flowing air ahead of the wings and downwash behind. The Kria, though, was a high wing rather than mid-wing monoplane, was smaller overall (the Phönix had a 16 m span) and had a butterfly tail.〔 Kría is the Icelandic name for the Arctic tern. The Kria's cantilever wing was straight tapered over all the span except for elliptical tips, with a unswept leading edge and a forward swept trailing edge. There was no dihedral. The wings carried short span ailerons at the tips and undersurface airbrakes, which could be extended at 90° to the airflow, inboard. The tail surfaces, separated by 110°, had swept leading edges and rounded tips.〔 The airflow-conforming aerodynamics of the fuselage gave it a rather humped back profile, with the dorsal line dropping away aft of the wing to a slender tail. Ahead of the wing the combined canopy-nose line was almost straight. A single piece canopy covered a cockpit which fitted only the smallest pilots. The underside of the forward fuselage was bulged and carried a close-fitting landing skid, which was assisted by an integral tail bumper.〔 The Kria was first flown on 31 December 1958, piloted by Rudi Lindner. It was pleasant to fly though rather lacking aileron response. Despite not being designed for serious competition, it performed better than any other span sailplane of its time.〔 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「Hirth Hi 25 Kria」の詳細全文を読む スポンサード リンク
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