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SZD-18 Czajka

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Polish single-seat glider, 1956

SZD-18 Czajka
SZD-18 Czajka at the Polish Aviation Museum
Role GliderType of aircraft
National origin Poland
Manufacturer SZD
Designer Władysław Okarmus
First flight 30 November 1956
Retired 1966
Status in museum
Number built 1

The SZD-18 Czajka (Szybowcowy Zakład Doświadczalny - Glider Experimental Works) (Czajka in English: Lapwing) was a single-seat glider designed and built in Poland in 1956.

Development

The last attempt by the LPŻ ( Liga Przyjaciół Żołnierza – Soldier's Friends League) paramilitary organization to design a single-seat training glider, after SZD-15 and SZD-16 designs, was the SZD-18 Czajka (lapwing), which appeared in 1956. It had a simple structure, box fuselage, strutted high wing and low performance typical for the primary type of training glider. The LPŻ held a competition in 1955 for the design of a new primary style single-seat trainer, which was won in March 1955 by the design by Tadeusz Grudzieński, named X-11. The prototype glider was constructed in the SZD in Bielsko by Władysław Okarmus, and designated SZD-18.

Flight trials began on 30 November 1956 (pilot Adam Zientek) proving, that the SZD-18 had good handling qualities and performance adequate for its intended role. It was regarded as one of the best gliders in its class and the Polish best training glider. However, the aero clubs, now independent of the LPŻ, rejected the single-seat training concept, moving towards the more conventional two-seat pupil/instructor method, which had been proven to be quicker, more efficient and safer. No production was carried out and the sole prototype (SP-1640) flew as a club glider with the Warsaw aero club until 1966, when it was given to the Polish Aviation Museum in Kraków.

Czajka at the Polish Aviation Museum

Specifications (SZD-18 Czajka with nacelle)

Data from SZD-18 Czajka

General characteristics

  • Crew: 1
  • Length: 6.3 m (20 ft 8 in)
  • Wingspan: 10.8 m (35 ft 5 in)
  • Height: 1.78 m (5 ft 10 in)
  • Wing area: 15.7 m (169 sq ft)
  • Aspect ratio: 7.4
  • Airfoil: R-III
  • Empty weight: 141 kg (311 lb)
  • Gross weight: 226 kg (498 lb)

Performance

  • Stall speed: 40 km/h (25 mph, 22 kn)
  • Never exceed speed: 133 km/h (83 mph, 72 kn)
  • g limits: +5
  • Maximum glide ratio: 9.3 at 57 km/h (35 mph; 31 kn)
  • Rate of sink: 1.13 m/s (222 ft/min) at 51 km/h (32 mph; 28 kn)
  • Wing loading: 14.4 kg/m (2.9 lb/sq ft)

See also

Aircraft of comparable role, configuration, and era

References

  1. Katarzyna Jodzińska. "Polish Aviation Museum Cracow". Muzeumlotnictwa.pl. Retrieved 15 April 2012.
  2. ^ Piechowski, Piotr. "SZD-18 Czajka". piotrp.de (in German). Retrieved 1 April 2020.
  3. ^ Krzyżan, Marian, Samoloty w muzeach polskich , Warsaw: Wydawnictwa Komunikacji i Łączności, 1983, ISBN 978-83-206-0432-0, p. 140
  4. (in Polish) Babiejczuk, Janusz and Grzegorzewski, Jerzy. Polski przemysł lotniczy 1945-1973 (Polish aerospace industry 1945-197). Warsaw: Wydawnictwo MON, 1974, p. 123

Further reading

  • Bridgman, Leonard, ed. (1958). Jane's All the World's Aircraft 1958-59. London: Jane's All the World's Aircraft Publishing Co. Ltd. p. 213.
  • Taylor, J. H. (ed) (1989) Jane's Encyclopedia of Aviation. Studio Editions: London. p. 29
  • "Modelarz" No 4 / 60 (April 1960).

External links

Polish post-1945 gliders
Instytut Szybownictwa
Szybowcowy Zakład Doświadczalny
/ PZL Bielsko-Biała / Allstar PZL Glider
Politechnika Warszawska
Margański & Mysłowski
PZL Krosno
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