PZL Bielsko SZD-29
| PZL Bielsko SZD-29 | |
|---|---|
| Type: | High performance glider |
| Design country: | |
| Manufacturer: | |
| First flight: |
April 25 (26?) 1965 |
| Commissioning: |
1965 |
| Number of pieces: |
2 |
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The PZL Bielsko SZD-29 Zefir 3 is a Polish high-performance glider for the open class . It was designed and built in Szybowcowy Zakład Doświadczalny ( German glider development plant) .
development
The SZD-29 is the successor to the SZD-19 Zefir 2 from 1960, but is a new design with an enlarged wingspan and a modified wing and tail unit shape. It was specially designed by a group under the direction of Bogumił Szuba for the glider flight taking place in South Cerney World Championship developed in 1965. However, since the date for this could not be kept, the Polish team finally started with the Foka 4 . In 1964, the first prototype with the registration number SP-2465 was completed and then subjected to static tests. Stanisław Szydlewski made the first flight on April 25, 1965. Although the Zefir 3 came too late for the championships in England, Jerzy Popiel was able to convince himself of the Polish championship that took place in the same year. In total, only two copies were built.
construction
The SZD-29 is a cantilevered shoulder -wing aircraft in half-shell construction with plywood planking, a spindle-shaped fuselage and an elliptical to circular cross-section. The bow and the fuselage-wing transitions are made of GRP . The aircraft is equipped with a braking parachute. The tie-bar-less wing is two-part, trapezoidal and has a laminar profile. It is also planked with plywood and foamed with polyester for stabilization. For the first time, splay flaps and ailerons were used over the entire span of a glider. There are Schempp-Hirth air brakes on the top and bottom . The self-supporting tail unit consists of the pendulum elevator and a very high rudder. The spring-loaded chassis consists of the rigid rear wheel and the fully retractable main wheel (dimensions 300 × 135 mm).
Technical specifications
| Parameter | Data |
|---|---|
| span | 19.00 m |
| length | 8.00 m |
| height | 2.10 m |
| Wing area | 15.70 m² |
| Wing extension | 23 |
| Wing loading | 33.2 kg / m² |
| Empty mass | 434 kg |
| Takeoff mass | 524 kg |
| Top speed | 300 km / h |
| Minimum speed | 72 km / h 65 km / h with the flaps extended |
| Glide ratio | 42 at 103 km / h |
| Slightest sinking | 0.68 m / s at 102 km / h |
| profile | NACA 66-215-416 |
| crew | 1 |
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 II . 2nd, revised edition. Transpress, Berlin, p. 93 .
Remarks
- ↑ This date can be found in Chudzinski, other publications (Copenhagen, Schmidt) mention April 26th as the date of the first flight.