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.
| SZD-17X Jaskółka L | |
|---|---|
| |
| SZD-17x in the Polish Aviation Museum | |
| Role | Glider |
| National origin | Poland |
| Manufacturer | SZD |
| Designer | Jan Dyrek, Tadeusz Kostia |
| First flight | 9 March 1956 |
| Introduction | 1956 |
| Number built | 4 |
| Developed from | SZD-14x Jaskółka M[1] |
Development
editThe 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 1956 World Gliding Championships, but performance fell short of expectations and they finally were not used there.[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] The glider was nicknamed laminarka, due to its laminar flow profile.[6]
Specifications (SZD-17X Jaskółka L)
editData from The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde[1][7]
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 (160 mph, 130 kn)
- Aerotow speed: 140 km/h (76 kn; 87 mph)
- Winch launch speed: 120 km/h (65 kn; 75 mph)
- g limits: +7.9 -1.9 at 186 km/h (100 kn; 116 mph)
- Maximum glide ratio: 31.2
- Rate of sink: 0.8 m/s (160 ft/min) at 87 km/h (47 kn; 54 mph)
- Wing loading: 39.7 kg/m2 (8.1 lb/sq ft)
Note: A. Glass[6] quotes different specifications: maximum glide ratio 30.5 at 98 km/h; best sink rate 0.86 m/s at 93 km/h; wing loading 31.2 kg/m2 (40 with ballast).
See also
editAircraft of comparable role, configuration, and era
Related lists
Notes
edit- ^ a b c "SZD-17x Jaskółka L (PL)". Archived from the original on 2009-08-21. Retrieved 2009-08-05.
- ^ Simons, Martin (2006). Sailplanes 1945–1965 (2nd revised ed.). Königswinter: EQIP Werbung und Verlag G.m.b.H. ISBN 3-9807977-4-0.
- ^ a b Babiejczuk, Janusz; Grzegorzewski, Jerzy (1974). Polski przemysł lotniczy 1945–1973. Warsaw: Wydawnictwo MON.
- ^ a b "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.
- ^ a b Glass, A. (ed) (1965), p.64-68
- ^ Shenstone, B.S.; K.G. Wilkinson; Peter Brooks (1958). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs dans Le Monde (in English, French, and German) (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 124–128.
References
edit- Shenstone, B.S.; K.G. Wilkinson; Peter Brooks (1958). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs dans Le Monde (in English, 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.
- Glass, Andrzej (ed) (1965) Konstrukcje lotnicze Polski Ludowej [Aviation constructions of People's Poland], WKiŁ, Warsaw, p. 64–68 (Polish)
Further reading
edit- Taylor, J. H. (ed) (1989) Jane's Encyclopedia of Aviation. Studio Editions: London. p. 29
External links
edit
- http://www.piotrp.de/SZYBOWCE/pszd17.htm
- http://www.muzeumlotnictwa.pl/zbiory_sz.php?ido=92&w=a
- http://www.flightglobal.com/pdfarchive/view/1958/1958%20-%200793.html
- http://www.flightglobal.com/pdfarchive/view/1958/1958%20-%200794.html
- http://www.airwar.ru/enc/glider/szd17.html
- http://www.luftfahrtmuseum.com/htmi/ite/szd17.htm