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SZD-17X Jaskółka L
The SZD-17X Jaskółka L was a single-seat high-performance competition glider designed and built in Poland at ''Szybowcowy Zakład Doświadczalny'' (Glider Experimental Works) in Bielsko-Biała in 1955.
== Development ==
The SZD-17X Jaskółka L (''Swallow Laminar'') drew on the experience gained from developing the SZD-11 and SZD-14X gliders combined with new laminar flow aerofoil sections and flaps, as well as provision for water ballast〔 and a fully retractable undercarriage. Main designer was Tadeusz Kostia, main constructor Jan Dyrek.〔 Construction of the SZD-17X was of conventional wooden semi-monocoque fuselage and thick skinned wooden wings with wooden spars, retaining the Jerzy Rudlicki's butterfly tail of the SZD-14X. First flight of the SZD-17X took place at Bielsko airfield, flown by Adam Zientek, on 9 March 1956.
Four aircraft, (reg'n no.'s SP-1504 to SP-1507), were built for use in 1956 World Gliding Championships, but performance fell short of expectations and they finally were not used there.〔 Despite the disappointing performance, Tadeusz Góra was able to establish a cross-country speed record on 9 May 1956 whilst flying SP-1506.〔(【引用サイトリンク】url=http://www.muzeumlotnictwa.pl/zbiory_sz.php?ido=92&w=a )〕 SP-1506 was used until 1977, then it was given to the Polish Aviation Museum. The glider was nick-named ''laminarka'', due to its laminar flow profile.〔
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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