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 1950. Only one example was built.

SZD-7 Osa
Role Glider aircraft
National origin Poland
Manufacturer SZD
First flight 16 August 1950
Number built 1
Developed from IS-2 Mucha

Development

The SZD-7 or IS-7[1] 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.[1] The prototype was registered as SP-1047.[2]

Specifications (SZD-7 Osa)

Data from http://www.piotrp.de/SZYBOWCE/pszd7.htm

General characteristics

  • Crew: 1
  • Length: 6.8 m (22 ft 4 in)
  • Wingspan: 15 m (49 ft 3 in)
  • Height: 1.6 m (5 ft 3 in)
  • Wing area: 14.1 m2 (152 sq ft)
  • Aspect ratio: 16
  • Airfoil: Kosti laminar flow
  • Empty weight: 237 kg (522 lb)
  • Gross weight: 327 kg (721 lb)

Performance

  • Maximum speed: 250 km/h (155 mph, 135 kn)
  • Stall speed: 56 km/h (35 mph, 30 kn)
  • g limits: +4.5 / -3
  • Maximum glide ratio: 26.1 at 81 km/h (50 mph/44 kts)
  • Rate of sink: 0.80 m/s (157 ft/min) at 73 km/h (45 mph/39 kts)

See also

Aircraft of comparable role, configuration, and era

References
  1. (in Polish) Babiejczuk, Janusz and Grzegorzewski, Jerzy. Polski przemysł lotniczy 1945-1973 (Polish aerospace industry 1945-197). Warsaw: Wydawnictwo MON, 1974, p. 118
  2. SZD-7 (IS-7) Osa
  • Taylor, J. H. (ed) (1989) Jane's Encyclopedia of Aviation. Studio Editions: London. p. 29
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