SZD-14x Jaskółka M

SZD-14x Jaskółka M
Role	Glider aircraft
National origin	Poland
Manufacturer	SZD Władysław Okarmus
Designer	Tadeusz Kostia
First flight	23 July 1954
Number built	1
Developed from	SZD-8 Jaskółka[1]
|} The SZD-14X Jaskółka M was a single-seat glider designed and built in Poland at Szybowcowy Zakład Doświadczalny - Glider Experimental Works in Bielsko-Biała in 1954. This was an experimental prototype, and only one unit was constructed.[1] Development The SZD-14X Jaskółka M was developed from the SZD-8bis Jaskółka (Swallow) for research into the construction, control and characteristics of 'V' or butterfly tail surfaces.[2] Using the airframe of the second prototype SZD-8 a 'V' tail was added to the rear fuselage, with arrangements for the balance of the surfaces and the angle between them to be adjusted as required.[1] The designer was Tadeusz Kostia, the constructor was Władysław Okarmus.[3] First flown by Adam Zientek at Bielsko on 23 July 1954,[3] the SZD-14 was found to be easy to fly with no vices, giving no indication that the tail layout was unconventional.[1] During spinning tests the rear fuselage was almost torn off, but the pilot (Dziurzyński) managed to regain control and recovered the aircraft to land safely.[2] Up to the time of the SZD-14's debut, the 'V' tail system was rare, with few aircraft using the system devised by Eng. Jerzy Rudlicki and demonstrated on a licence-built Hanriot HD.14 biplane in the early 1930s.[4] Specifications (SZD-14x Jaskółka M) Data from http://www.piotrp.de/SZYBOWCE/pszd14.htm General characteristics Crew: 1 Length: 6.48 m (21 ft 3 in) Wingspan: 16 m (52 ft 6 in) Height: 1.3 m (4 ft 3 in) Wing area: 13.6 m^2 (146 ft^2) Aspect ratio: 18.8 Wing profile: NACA 23012A Empty weight: 288 kg (635 lb) Gross weight: 373 kg (822 lb) Performance Maximum speed: 250 km/h (155 mph) Stall speed: 59 km/h (37 mph) Maximum glide ratio: 26.3 @ 80 km/h (43 kts/50 mph) Rate of sink: 0.7 m/s (138 ft/min) See also Related development SZD-8 Jaskółka SZD-17X Jaskółka L Aircraft of comparable role, configuration and era Standard Austria References http://www.piotrp.de/SZYBOWCE/pszd14.htm Simons, Martin. Sailplanes 1945-1965 2nd revised ed. EQIP Werbung und Verlag G.m.b.H.. Königswinter. 2006. ISBN 3-9807977-4-0 Babiejczuk, Grzegorzewski. Polski przemysł lotniczy 1945-1973, p. 120 Cynk, Jerzy B.. “Polish Aircraft 1893–1939”. London, Putnam. 1971. ISBN 0-370-00085-4 Taylor, J. H. (ed) (1989) Jane's Encyclopedia of Aviation. Studio Editions: London. p. 29 Cynk, Jerzy B.. “Polish Aircraft 1893–1939”. London, Putnam. 1971. ISBN 0-370-00085-4 Simons, Martin. Sailplanes 1945-1965 2nd revised edition. EQIP Werbung und Verlag G.m.b.H.. Königswinter. 2006. ISBN 3-9807977-4-0 (Polish) Babiejczuk, Janusz and Grzegorzewski, Jerzy. Polski przemysł lotniczy 1945-1973 [Polish aerospace industry 1945-1973]. Warsaw: Wydawnictwo MON, 1974 External links http://www.piotrp.de/SZYBOWCE/pszd14.htm