PWS-8
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| PWS-8 | |
|---|---|
| Type | Sports plane |
| Manufacturer | PWS |
| Maiden flight | 1929/1930 |
| Introduced | 1930 |
| Status | prototype |
| Number built | 1 |
The PWS-8 was a Polish sports plane of 1930, constructed by the Podlaska Wytwórnia Samolotów (PWS), that remained a prototype.
Contents |
[edit] Design and development
The plane was designed in 1929 by Jarosław Naleszkiewicz in Podlaska Wytwórnia Samolotów, on factory's initiative, to participate in the Challenge 1930 international touring aircraft contest. It was a wooden biplane, partly modeled after de Havilland Gipsy Moth. Its unique feature were N-shaped struts between lower and upper wing and additional oblique transversal struts, stiffening the design, instead of wire braces.
The plane was first flown in 1929/1930 by F. Rutkowski, with Genet 80 hp radial engine. In spring of 1930 it was modified, with Walter Vega 85 hp radial engine, also a tailfin shape and some other details were changed. It was however too heavy for engines used (65 kg heavier, than designed).
The plane was a counterpart of PZL.5 for a sportsplane and trainer, but was worse, and as a result, remained a prototype.
[edit] Operational history
The prototype, with markings SP-ADA, took part in the Challenge 1930 international contest in July 1930, flown by Piotr Dudziński. He was disqualified for time infringement during a rally over Europe, but completed the rally off the contest.
Later the plane was used for a short time by an Aviation Club of the PWS factory.
[edit] Description
Wooden construction braced biplane. Fuselage rectangular in cross-section, covered with plywood and duralumin in engine section. Rectangular three-section wings with rounded tips, two-spar, canvas covered (plywood covered on a leading edge). Ailerons on a lower wing, which had a span of 9 m. Wings were folding rearwards (width with folded wings: 2.95 m). Crew of two, sitting in tandem in open cockpits with windshields. Cockpits with dual controls (a front cockpit had removable set of controls). The third cab could be set up in a baggage compartment behind.
5-cylinder air-cooled radial engine Walter Vega in front, 85 hp nominal power and 90 hp take-off power. Two-blade wooden propeller Heine of a fixed pitch. Conventional fixed landing gear, with a rear skid. Fuel tank 125 l in upper central wing section (additional 60 l tank could be mounted in the fuselage front). Fuel consumption - 22 l/hour.
[edit] Specifications
General characteristics
- Crew: 1, pilot
- Capacity: 1, student or passenger
- Length: 7.5 m ()
- Wingspan: 10 m ()
- Height: 2.95 m ()
- Wing area: 22.1 m² ()
- Empty weight: 455 kg ()
- Loaded weight: 775 kg ()
- Useful load: 320 kg ()
- Powerplant: 1× Walter Vega 5-cylinder air-cooled radial engine, 85 hp ()
Performance
- Maximum speed: 136 km/h
- Cruise speed: 125 km/h
- Stall speed: 72 km/h ()
- Range: 700 km ()
- Service ceiling 3,000 m ()
- Rate of climb: 2.4 m/s ()
- Wing loading: 35 kg/m² ()
[edit] See also
Comparable aircraft
[edit] References
- Andrzej Glass: "Polskie konstrukcje lotnicze 1893-1939" (Polish aviation constructions 1893-1939), WKiŁ, Warsaw 1977 (Polish language, no ISBN)
[edit] External links
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