PZL Bielsko SZD-31
| PZL Bielsko SZD-31 | |
|---|---|
|
|
| Type: | High performance glider |
| Design country: | |
| Manufacturer: | |
| First flight: |
7th December 1967 |
| Number of pieces: |
3 |
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The PZL Bielsko SZD-31 Zefir 4 is a single-seat high - performance glider from the Polish company Szybowcowy Zakład Doświadczalny ( German glider development plant ).
development
The high-wing aircraft is largely made of wood and was developed from the SZD-29 Zefir 3 . Development manager Bogumił Szuba provided the Zefir 4 with six instead of four-part Fowler flaps , of which the two outer ones were coupled to the ailerons. She also received a thick fuselage and an instrument panel that accommodated an oxygen system. Adam Zientek carried out the maiden flight of the first prototype (registration number SP-2517 ) on December 7, 1967. The SP – 2518 and the SP – 2519 followed . Two of the three built Zefir 4 made their competitive debut at the 1968 World Championships in Leszno , although defending champion Jan Wróblewski and Mirosław Krolikowski, who also took part, had no chance of winning due to the high wing loading and poor thermal conditions. They could only take 14th or 28th place.
Technical specifications
| Parameter | Data |
|---|---|
| Years of construction | 1967 |
| Manufacturer | SZD Bielsko |
| Designer (s): | Bogumił Szuba |
| crew | 1 |
| length | 8.0 m |
| span | 19.0 m |
| height | 2.1 m |
| Wing area | 15.70 m² |
| Wing extension | 23 |
| Max. Wing loading | 29/35 kg / m² |
| Glide ratio | 42 at 106 km / h |
| slightest sinking | 0.68 m / s at 102 km / h |
| Preparation mass | 435 kg |
| Max. Flight mass | 530 kg |
| Max. permissible speed | 240 km / h |
| Minimum speed | 72 km / h |
| profile | NACA 66-215 / 66-416 |
literature
- Kazimierz Wojciech Chudzinski: Polish gliders . Volume 1: 1945-1970. Verlag für Technik und Handwerk, Baden-Baden 2014, ISBN 978-3-88180-454-7 .
- Wilfried Copenhagen : The great aircraft type book . 2nd Edition. Transpress, Berlin 1982 (VLN: 162-925 / 173/82).
- Heinz A. F. Schmidt: Airplanes from all over the world. Volume III . Transpress, Berlin, p. 93 .
Web links
Individual evidence
- ↑ FliegerRevue December 2011, p. 67, collection series SZD-31 Zefir 4