LWD Żak
From Wikipedia, the free encyclopedia
| LWD Żak | |
|---|---|
| Type | Touring and trainer aircraft |
| Manufacturer | LWD |
| Designed by | Tadeusz Sołtyk |
| Maiden flight | 23 March 1947 |
| Introduced | 1947 |
| Retired | 1955 |
| Primary user | Polish civilian aviation |
| Produced | 1947-1948 |
| Number built | 13 |
The LWD Żak was a Polish touring and trainer aircraft of late 1940s, designed in the LWD and built in a short series.
Contents |
[edit] Design and development
The Żak (old-fashioned "student") was designed in the Lotnicze Warsztaty Doświadczalne (LWD, Aviation Experimental Workshops) in Łódź, directed by Tadeusz Sołtyk in 1946, as one of the first Polish post-war aircraft. It was a light low-wing cantilever monoplane of a mixed construction, with a crew of two, sitting side by side, and fixed conventional landing gear. The first prototype Żak-1 was first flown on March 23, 1947. It was powered by the Czechoslovak 65 hp straight engine Walter Mikron III and carried markings SP-AAC. The second prototype Żak-2 was powered by the 65 hp flat engine Continental A-65 and had an open cockpit. It was flown on November 27, 1947 and carried markings SP-AAE.
The design appeared successful and the Ministry of Communication ordered a series of 10 aircraft. They were to be powered by licence-built A-65 engines, but since plans of engine production were abandoned, it was decided to fit them with Walter Mikron engines. They were also fitted with a closed canopy, sliding rearwards, and named Żak-3. Ten planes were built by the LWD in the end of 1948, the first of them was flown on November 8, 1948. They had markings: SP-AAS to SP-AAZ, and SP-BAA to SP-BAC. At least one (SP-AAX) had engine replaced later with 85 hp (63 kW) Cirrus F.III. They were used in the Polish regional aero clubs until 1955.
On October 20, 1948 there was flown a prototype of the last variant, Żak-4, meant for a glider towing. It had stronger 105 hp Walter engine and an open canopy. Since it showed unsuitable for glider towing, and old Polikarpov Po-2 appeared the better plane for this purpose, Żak-4 was not built in series, and the prototype was re-fitted with a closed canopy and used as a touring plane in aero club (markings SP-BAE).
[edit] Variants
- Żak-1 (SP-AAC)
- The first prototype powered by Walter Mikron III engine.
- Żak-2 (SP-AAE)
- The second prototype without canopy and powered by Continental A-65 engine.
- Żak-3
- Main production version with closed canopy and powered by Walter Mikron III engine, 10 built.
- Żak-4 (SP-BAE)
- Prototype of the glider towing version with open canopy (later refitted with a closed one) and powered by Walter engine.
[edit] Operators
[edit] Survivors
Żak-3 SP-AAX is preserved in the Polish Aviation Museum in Kraków (disassembled as for 2007)
[edit] Specifications (Żak-3)
General characteristics
- Crew: one, pilot
- Capacity: one
- Length: 7.6 m ()
- Wingspan: 11.8 m ()
- Height: 1.95 m ()
- Wing area: 16.83 m2 ()
- Empty weight: 405 kg ()
- Loaded weight: kg ()
- Powerplant: 1× Walter Mikron III aircooled 4-cylinder straight engine, 65 hp (48 kW)
Performance
- Maximum speed: 157 km/h
- Range: 310 km ()
- Service ceiling 3,500 m ()
[edit] References
- Babiejczuk, Janusz and Grzegorzewski, Jerzy: Polski przemysł lotniczy 1945-1973 (Polish aviation industry...), Wydawnictwo MON, Warsaw 1974 (Polish)
- Krzyżan, Marian: Samoloty w muzeach polskich, Warsaw 1983, ISBN 83-206-0432 (Polish)
- Photo and description at Poser page (Polish)
[edit] See also
Comparable aircraft
- RWD-21 - Zlin Z-22 Junak - Bücker Bü 181
[edit] External links
|
|||||
|
||||||||||||||
