| 词条 | LWD Żak | ||||||||||||||||
| 释义 |
The LWD Żak was a Polish touring and trainer aircraft of the late 1940s, designed in the LWD and built in a short series. Design and developmentThe 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). Variants
The first prototype powered by Walter Mikron III engine.
The second prototype without canopy and powered by Continental A-65 engine.
Main production version with closed canopy and powered by Walter Mikron III engine, 10 built.
Prototype of the glider towing version with open canopy (later refitted with a closed one) and powered by Walter engine. Operators
SurvivorsŻak-3 SP-AAX is preserved in the Polish Aviation Museum in Kraków (disassembled as for 2007) Specifications (Żak-3){{Aircraft specifications||plane or copter?=plane |jet or prop?=prop |ref=Jane's All The World's Aircraft 1953-54 [1] |crew=two |capacity=one |length main=7.6 m |length alt=23 ft 11 in |span main=11.8 m |span alt=38 ft 8½ in |height main=1.95 m |height alt=6 ft 5 in |area main=17 m² |area alt= 183 sq ft |empty weight main= 400 kg |empty weight alt= 880 lb |loaded weight main= 620 kg |loaded weight alt= 1,365 lb |max takeoff weight main= |max takeoff weight alt= |engine (prop)=Walter Mikron III |type of prop= air-cooled 4-cylinder straight engine |number of props=1 |power main=65 hp |power alt=48 kW |max speed main=160 km/h |max speed alt=86 knots, 99 mph |range main=400 km |range alt=216 nmi, 248 mi |ceiling main=3,500 m |ceiling alt=11,500 ft |climb rate main=2.7 m/s |climb rate alt=520 ft/min |loading main= |loading alt= |power/mass main= |power/mass alt= }} See also{{Aircontent||related= |similar aircraft=
|lists= |see also= }} References1. ^Bridgman 1953, p.173.
External links{{commons category|Lotnicze Warsztaty Doświadczalne}}
5 : LWD aircraft|Polish civil trainer aircraft 1940–1949|Polish civil utility aircraft 1940–1949|Single-engined tractor aircraft|Low-wing aircraft |
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