PZL Bielsko SZD-36
| PZL Bielsko SZD-36 Cobra 15 | |
|---|---|
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| Type: | High performance glider |
| Design country: | |
| Manufacturer: | |
| First flight: |
December 30, 1969 |
| Commissioning: |
1970 |
| Production time: |
1969-1977 |
| Number of pieces: |
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The PZL Bielsko SZD-36 Cobra 15 is a single-seat high-performance glider that was mainly used for training and competitions in the 15 m standard class . The abbreviation SZD ( Szybowcowy Zakład Doświadczalny ) means “Glider Development Plant”.
history
Impetus for the development led by Władysław Okarmus were the 1970 in Marfa held XII. World championships in gliding. A parallel design was the SZD-39 Cobra 17 . Adam Zientek made the maiden flight with the first prototype ( SP-2538 ) on December 30, 1969. A second with the registration number SP-2538 flew for the first time on February 25, 1970. In the same year series production began under the designation SZD-36A. The start of the first series Cobra ( SP-2579 ) was carried out by Jerzy Popiel on October 29, 1970. Together with the two prototypes, a total of 290 aircraft were produced. In Marfa, Jan Wróblewski with the SZD-36 was vice world champion in the standard class, Franciszek Kępka took third place.
technical description
The self-supporting shoulder wing is made of wood materials and partly of plastics ( GRP ). The two-part trapezoidal wing with a continuous spar and double Schempp-Hirth airbrakes is made of wood with a plastic coating. The fin of the T-tail is swept, the elevator is designed as a pendulum rudder . The “Cobra” has a retractable, brakable main wheel, which is turned into the fuselage on an axis in the direction of flight, and a sprung tail spur. The landing gear shaft is closed by a one-piece GFP part that partially retracts into the fuselage when the landing gear is extended. The retractable landing gear of the Cobra tends to snap the landing gear back into the fuselage.
Technical specifications
| Parameter | Data |
|---|---|
| Years of construction | 1969-1977 |
| Manufacturer | PZL Bielsko |
| Designer (s): | Wladyslaw Okarmus |
| span | 15.00 m |
| length | 6.98 m |
| height | 1.59 m |
| Wing area | 11.60 m² |
| Wing extension | 19.40 |
| Wing swept | 1.5 ° |
| V position | 2 ° |
| Wing profile | Strak FX 61-168 to FX 60-1261 |
| Glide ratio | 38 at 97 km / h |
| Slightest sinking | 0.68 m / s at 73 km / h |
| Empty mass | 275 kg |
| payload | approx. 130 kg |
| Takeoff mass | maximum 405 kg |
| Wing loading | 34.9 kg / m² |
| crew | 1 |
| Minimum speed | 67 km / h |
| Top speed | 250 km / h (permissible) 150 km / h (in aircraft tow) 130 km / h (in winch tow) |
| Load multiples | + 6 / -3 g |
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: SZD-36 "Cobra 15" . In: Flieger-Jahrbuch 1972 . Transpress, Berlin 1971, p. 97 .
