| PWS-4 | |
|---|---|
| Role | Sports aircraft |
| Manufacturer | PWS |
| First flight | September 1928 |
| Status | prototype |
| Number built | 1 |
The PWS-4 was a Polish sports aircraft, developed in 1928 by PWS (Podlaska Wytwórnia Samolotów - Podlasie Aircraft Factory), which remained a prototype.
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The PWS-4 was conceived as a cheap and simple single seater sports aircraft. It was designed by August Bobek-Zdaniewski in the PWS factory in 1928. The prototype was flown in September 1928 at Biała Podlaska, by Franciszek Rutkowski. The plane was not built in any series due to lack of orders, besides, the Polish sports aviation was interested mostly in more universal two-seater machines.[1] The experience was later utilized in PWS-50 design.
The prototype PWS-4 took part in the 2nd Polish Light Aircraft Contest between 29 October-1 November 1928, taking the 6th place. Later it was used by the LOPP paramilitary organization in Biała Podlaska. Among others, it was used for aerobatics. In 1930 it was given a registration number SP-AEB.[1]
The PWS-4 was a single-seater high-wing braced monoplane of wooden construction. The fuselage was a wooden frame, covered with plywood, apart from the engine section, which was covered with aluminium sheeting. The empennage was wooden, fabric covered. The rectangular wooden wings had two spars, and were covered with plywood in front and fabric in the rear. Wings were supported with pairs of twin struts. The undercarriage consisted of a fixed common axle conventional landing gear, with a rear skid. Fuel was carried in a tank in wings, 45 l capacity.[1]
The 9-cylinder Salmson AD.9 air-cooled radial engine was giving a nominal power of 40 hp (30 kW), driving a two-blade fixed pitch wooden propeller. A cruise fuel consumption was 11-13 l/h.[1]
Data from Glass, A. (1977), p.180
General characteristics
Performance
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