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