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SZD-7 Osa
The SZD-7 Osa was a single-seat developmental glider aircraft that was designed and built in Poland at ''Szybowcowy Zakład Doświadczalny'' (Glider Experimental Works) in Bielsko-Biała in . Only one example was built. ==Development== The SZD-7 or IS-7〔 Osa (''Wasp'') was based on the IS-2 Mucha, with a laminar flow aerofoil section developed by Tadeusz Kostia. Little information on laminar flow aerofoils was available but Kostia was able to design the aerofoil for the SZD-7 Osa to achieve laminar flow to at least 18% chord. As well as the laminar flow wings, the Osa introduced the SZD plate-style airbrakes, which were installed aft of the mainspar. The first flight of the Osa took place at Bielsko airfield piloted by Adam Zientek on 16 August 1950.〔 Babiejczuk, Janusz and Grzegorzewski, Jerzy. ''Polski przemysł lotniczy 1945-1973'' (Polish aerospace industry 1945-197). Warsaw: Wydawnictwo MON, 1974, p. 118〕 The prototype was registered as SP-1047.〔(SZD-7 (IS-7) Osa )〕
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