PZL Bielsko SZD-25
| SZD-25 Lis | |
|---|---|
|
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| Type: | Glider |
| Design country: | |
| Manufacturer: | |
| First flight: |
March 5, 1960 |
| Commissioning: |
1961/62 |
| Production time: |
1960-1961 |
| Number of pieces: |
|
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The PZL Bielsko SZD-25 Lis ( German Fuchs ) is a Polish school - Glider . It was designed in Szybowcowy Zakład Doświadczalny (SZD, Glider Development Plant) in Bielsko-Biała .
history
The SZD-25 Lis was developed as a further development of the SZD-22 Mucha Standard . Z. Badura was responsible for the construction. He combined the wing of the SZD-22E with the fuselage of the SZD-16 Gil , a training single-seater from 1958, which had not got beyond the prototype stage. Work began in 1960 and in the same year Jerzy Skrzydlewski carried out the maiden flight on March 5th. The prototype (license number: SP-1621 ) was then tested in 65 hours, which was completed in 53 hours. The following year, the Krosno glider workshop began producing a small series of 30 aircraft for use in Polish aero clubs. The first example of the series version designated as SZD-25A with the registration number SP-2342 flew for the first time on August 16, 1961. A Lis served as the SZD-25Z as a test vehicle for the brake parachutes of the Zefir series SZD-19 and SZD-29 . At least one SZD-25 has been preserved and is in an airworthy condition.
technical structure
The SZD-25 is a cantilevered shoulder wing aircraft . The fuselage consists of a tubular steel frame with GRP planking in the bow and upper area and fabric covering on the sides. This is followed by the tail boom in the form of a conical, high-set fuselage tube, at the end of which is the cantilevered normal tail unit made of wood with fabric covering. The single-spar , two-part wing has an offset of –4.5 ° between the eleventh and 25th rib, a torsion nose box made of plywood and is made of GRP at the fuselage transition. It is equipped with metal air brakes. The undercarriage consists of a spring-loaded, partially retractable main wheel of 300 × 125 mm with a brake, a likewise sprung tail spur and a wooden runner on the bow.
Technical specifications
| Parameter | Data |
|---|---|
| span | 14.98 m |
| length | 7.00 m |
| height | 1.50 m |
| Wing area | 12.75 m² |
| Wing extension | 17.65 |
| V position | 4 ° |
| Trunk width | 0.57 m |
| Empty mass | 231 kg |
| Payload | 110 kg |
| Takeoff mass | 315-341 kg |
| Top speed | 230 km / h 140 km / h in aircraft tow 110 km / h in winch tow |
| Minimum speed | 59 km / h |
| Glide ratio | 26.5 at 76 km / h |
| Slightest sinking | 0.76 m / s at 76 km / h |
| profile | Gö 549 (wing root) M-12 (wing tip) |
| 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 .
- Heinz A. F. Schmidt: Gliders . In: Aerotype . Transpress, Berlin 1969, p. 74/75 .
- Heinz A. F. Schmidt: Airplanes from all over the world. Volume II . 2nd revised edition. Transpress, Berlin, p. 108 .
