SZD-17X Jaskółka L

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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[1] and a fully retractable undercarriage.[2] Main designer was Tadeusz Kostia, main constructor Jan Dyrek.[3] 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.[3]

Four aircraft, (reg'n no.'s SP-1504 to SP-1507), were built for use in World Gliding Championships, but performance fell short of expectations.[4] Despite the disappointing performance, Tadeusz Góra was able to establish a cross-country speed record on 9 May 1956 whilst flying SP-1506.[4] SP-1506 was used until 1977, then it was given to the Polish Aviation Museum.[5]

Hardly visible SZD-17x SP-1506 (bottom right) in the Polish Aviation Museum

Specifications (SZD-17X Jaskółka L)

Data from The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde[6][1]

General characteristics

  • Crew: 1
  • Length: 6.8 m (22 ft 4 in)
  • Wingspan: 16 m (52 ft 6 in)
  • Height: 1.26 m (4 ft 2 in)
  • Wing area: 13.6 m2 (146 sq ft)
  • Aspect ratio: 18.8
  • Airfoil: NACA 652512a
  • Empty weight: 340 kg (750 lb) equipped
  • Max takeoff weight: 540 kg (1,190 lb)

Performance

  • Never exceed speed: 250 km/h (155 mph; 135 kn)
  • Aerotow speed: 140 km/h (75.6 kn; 87.0 mph)
  • Winch launch speed: 120 km/h (64.8 kn; 74.6 mph)
  • g limits: +7.9 -1.9 at 186 km/h (100.4 kn; 115.6 mph)
  • Maximum glide ratio: 31.2
  • Rate of sink: 0.8 m/s (160 ft/min) at 87 km/h (47.0 kn; 54.1 mph)
  • Wing loading: 39.7 kg/m2 (8.1 lb/sq ft)

See also

Aircraft of comparable role, configuration and era

Notes

  1. ↑ 1.0 1.1 1.2 http://www.piotrp.de/SZYBOWCE/pszd17.htm
  2. ↑ Simons, Martin (2006). Sailplanes 1945-1965 (2nd revised ed.). Königswinter: EQIP Werbung und Verlag G.m.b.H. ISBN 3-9807977-4-0. 
  3. ↑ 3.0 3.1 Babiejczuk, Janusz; Grzegorzewski, Jerzy (1974). Polski przemysł lotniczy 1945-1973. Warsaw: Wydawnictwo MON. 
  4. ↑ 4.0 4.1 "SZD-17X Jaskółka L". Retrieved 17 June 2013. 
  5. ↑ Krzyżan, Marian (1983). Samoloty w muzeach polskich. Warsaw: Wydawnictwa Komunikacji i Łączności. pp. 139–140. ISBN 978-83-206-0432-0. 
  6. ↑ Shenstone, B.S.; K.G. Wilkinson & Peter Brooks (1958). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs dans Le Monde (in Primarily English with French and German) (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 124–128. 

References

  • Shenstone, B.S.; K.G. Wilkinson & Peter Brooks (1958). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs dans Le Monde (in Primarily English with French and German) (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 124–128. 
  • Piechowski, Piotr. "SZD-17x Jaskółka L". Retrieved 17 June 2013. 
  • Krzyżan, Marian (1983). Samoloty w muzeach polskich. Warsaw: Wydawnictwa Komunikacji i Łączności. pp. 139–140. ISBN 978-83-206-0432-0. 
  • Babiejczuk, Janusz; Grzegorzewski, Jerzy (1974). Polski przemysł lotniczy 1945-1973. Warsaw: Wydawnictwo MON. 
  • Simons, Martin (2006). Sailplanes 1945-1965 (2nd revised ed.). Königswinter: EQIP Werbung und Verlag G.m.b.H. ISBN 3-9807977-4-0. 
  • "SZD-17X Jaskółka L". Retrieved 17 June 2013. 

Further reading

  • Taylor, J. H. (ed) (1989) Jane's Encyclopedia of Aviation. Studio Editions: London. p. 29


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