PZL Bielsko SZD-32
| PZL Bielsko SZD-32 Foka 5 | |
|---|---|
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| Type: | Performance glider |
| Design country: | |
| Manufacturer: | |
| First flight: |
November 28, 1966 |
| Commissioning: |
1968 |
| Production time: |
1968-1971 |
| Number of pieces: |
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The PZL Bielsko SZD-32 Foka 5 ( German seal ) is a polish performance glider the default class . SZD stands for Szybowcowy Zakład Doświadczalny (Glider Development Plant ).
history
The Foka 5 was created as the successor to the successful Foka 4 from 1960. It was developed by Władysław Okarmus (1922–1987). In contrast to the previous model, the Foka 5 received an attached T-tail unit and a modified airfoil profile to reduce the minimum speed and improve the stall and circling properties. She was also equipped with a more spacious cabin. S. Skrzydlewski made the first flight of the prototype with the aircraft registration number SP-2504 on November 28, 1966, the certificate of airworthiness was issued on October 7, 1967. Series production began in 1968 under the designation SZD-32A. In the same year, the Polish national team took part with the Foka 5 in the world championships in gliding that took place in Leszno that year . However, the model could not build on the good performance of the Foka 4, with which Jan Wróblewski won the world title in 1965 and set several world records. Due to its wooden construction, it was no longer able to keep up with the world's best. Like their Polish colleagues, the GDR team, equipped with the Foka 4 and participating in a world championship for the first time, could no longer achieve top places at this point. The competitions were dominated by the more powerful gliders in GRP construction . Nevertheless, a total of 134 Fokas had been built by 1971, 97 of which were exported. The GDR alone received 35 SZD-32A, which were flown by the GST from 1969 .
The Foka 5 is still used today in glider clubs.
Others
In 1968 the Foka 5 was awarded the OSTIV Prize for the best aircraft in the standard class.
On June 22, 1973, Udo Elke, a successful GST high-performance pilot and at the time the youngest holder of the Gold C with 3 diamonds in the world, fled in a competition during the GDR glider championships in Neustadt-Glewe with a Foka 5 (mark DM- 2248 , serial number W487) to the Federal Republic and landed after a 450 km flight on a sugar beet field near Ruploh in North Rhine-Westphalia . Some time later, the aircraft was transported back by truck by aviation athletes from the GDR, including Elke's trainer.
construction
The Foka 5 is designed as an all-wood shell construction. The fuselage is planked with 1.5 mm plywood and has an oval cross-section, the front part is made of glass fiber reinforced plastic (GRP). The trapezoidal wing has a laminar profile, double-decker metal airbrakes at a depth of around 60% and is swept by 2 °. The non-retractable main wheel is half-recessed behind a spring-loaded wooden runner, at the rear there is a metal spur. The oars are covered with fabric.
Technical specifications
| Parameter | Data (SZD-32A) |
|---|---|
| crew | 1 |
| length | 7.17 m |
| span | 14.98 m |
| height | 1.61 m |
| Wing area | 12.16 m² |
| Wing extension | 18.5 |
| Wing profile | Wing root: NACA 63-3-618 Wing tip : NACA 4415 |
| Wing loading | 31.7 kg / m² |
| Glide ratio | 36.3 at 85 km / h 34 at 94 km / h |
| Slightest sinking | 0.63 m / s at 77 km / h |
| Empty mass | 256 kg |
| payload | 129 kg |
| Takeoff mass | maximum 385 kg |
| Minimum speed | 68 km / h |
| Top speed | 250 km / h (*) |
| Load multiples | + 6 / −3 g |
* limited to 220 km / h after 12 years or 2000 hours of flight
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 . 2nd revised edition. Transpress, Berlin, p. 94 .
Web links
Individual evidence
- ↑ SZD-32A "Foka 5". In: Flieger – Jahrbuch 1970 , Transpress, Berlin 1969, p. 137
- ↑ Peter Stache: Glider World Championship Leszno 1968. In: Aerosport No. 8/1968, p. 298
- ^ Detlef Billig, Manfred Meyer: Airplanes of the GDR. Volume II until 1972. TOM Modellbau, Friedland 2002, ISBN 3-613-02241-9 , p. 11
- ^ Jörg Mückler: German-German border flights. In: Flieger Revue Extra No. 16, Möller Buch und Zeitschriften, 2007, ISSN 0941-889X , p. 16