The PWS-4 (PWS - Podlaska Wytwórnia Samolotów - Podlasie Aircraft Factory) was a prototype Polish sports aircraft, developed in 1928 by Podlaska Wytwórnia Samolotów.
The PWS-4 was conceived as a cheap and simple single seater sports aircraft. It was designed by August Bobek-Zdaniewski in the Podlaska Wytwórnia Samolotów factory in 1928. The prototype was flown in September 1928 at Biała Podlaska, by Franciszek Rutkowski. It did not enter production due to lack of orders, as the Polish sports aviation movement was interested mostly in more universal two-seater machines.[1] The design was later used as the basis for the PWS-50.
Operational historyedit
The prototype PWS-4 took part in the second Polish Light Aircraft Contest between 29 October-1 November 1928, taking sixth place. Later it was used by the LOPP paramilitary organization in Biała Podlaska. Among others, it was used for aerobatics.[1]
Constructionedit
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 structure was wood, with fabric covering. The rectangular wooden wings had two spars; were covered with plywood in front and fabric in the rear; and 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 the wings, 45 L capacity.[1]
The 9-cylinder Salmson AD.9 air-cooled radial engine was rated at 40 hp (30 kW), driving a two-blade fixed pitch wooden propeller. Cruise fuel consumption was 11-13 L/h.[1]
Specification (PWS-4)edit
Data from Polskie konstrukcje lotnicze 1893–1939,[1] Polish aircraft 1893-1939[2]
^ abcdeGlass, Andrzej (1977). Polskie konstrukcje lotnicze 1893–1939 [Polish aviation designs 1893–1939] (in Polish). Warsaw: WKiŁ. p. 180. OCLC 213774512.
^Cynk, Jerzy B (1971). Polish aircraft 1893-1939. Putnam. pp. 391–392. ISBN0-370-00085-4.
External linksedit
Wikimedia Commons has media related to PWS-4.
Photos and drawing at Ugolok Neba
May 04, 2024
podlaska, wytwórnia, samolotów, podlasie, aircraft, factory, prototype, polish, sports, aircraft, developed, 1928, podlaska, wytwórnia, samolotów, 1928, role, sports, aircraft, manufacturer, podlaska, wytwórnia, samolotów, first, flight, september, 1928, statu. The PWS 4 PWS Podlaska Wytwornia Samolotow Podlasie Aircraft Factory was a prototype Polish sports aircraft developed in 1928 by Podlaska Wytwornia Samolotow PWS 4 PWS 4 in 1928 Role Sports aircraft Manufacturer Podlaska Wytwornia Samolotow PWS First flight September 1928 Status prototype Number built 1 Contents 1 Design and development 2 Operational history 3 Construction 4 Specification PWS 4 5 Notes 6 External linksDesign and development editThe PWS 4 was conceived as a cheap and simple single seater sports aircraft It was designed by August Bobek Zdaniewski in the Podlaska Wytwornia Samolotow factory in 1928 The prototype was flown in September 1928 at Biala Podlaska by Franciszek Rutkowski It did not enter production due to lack of orders as the Polish sports aviation movement was interested mostly in more universal two seater machines 1 The design was later used as the basis for the PWS 50 Operational history editThe prototype PWS 4 took part in the second Polish Light Aircraft Contest between 29 October 1 November 1928 taking sixth place Later it was used by the LOPP paramilitary organization in Biala Podlaska Among others it was used for aerobatics 1 Construction editThe 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 structure was wood with fabric covering The rectangular wooden wings had two spars were covered with plywood in front and fabric in the rear and 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 the wings 45 L capacity 1 The 9 cylinder Salmson AD 9 air cooled radial engine was rated at 40 hp 30 kW driving a two blade fixed pitch wooden propeller Cruise fuel consumption was 11 13 L h 1 Specification PWS 4 editData from Polskie konstrukcje lotnicze 1893 1939 1 Polish aircraft 1893 1939 2 General characteristicsCrew 1 Length 5 57 m 18 ft 3 in Wingspan 7 6 m 24 ft 11 in Height 1 8 m 5 ft 11 in Wing area 11 m2 120 sq ft Airfoil Bobek Zdaniewski No 6 Gottingen 655 Empty weight 238 kg 525 lb Gross weight 350 kg 772 lb Powerplant 1 Salmson AD 9 9 cylinder air cooled radial piston engine 30 kW 40 hp Propellers 2 bladed fixed pitch propeller Performance Maximum speed 140 km h 87 mph 76 kn at sea level Cruise speed 123 km h 76 mph 66 kn Minimum speed 60 km h 37 mph 32 kn Range 400 km 250 mi 220 nmi Service ceiling 3 500 m 11 500 ft Rate of climb 1 4 m s 280 ft min Wing loading 31 8 kg m2 6 5 lb sq ft Power mass 0 085 kW kg 0 052 hp lb Notes edit a b c d e Glass Andrzej 1977 Polskie konstrukcje lotnicze 1893 1939 Polish aviation designs 1893 1939 in Polish Warsaw WKiL p 180 OCLC 213774512 Cynk Jerzy B 1971 Polish aircraft 1893 1939 Putnam pp 391 392 ISBN 0 370 00085 4 External links edit nbsp Wikimedia Commons has media related to PWS 4 Photos and drawing at Ugolok Neba Retrieved from https en wikipedia org w index php title PWS 4 amp oldid 1118965289, wikipedia, wiki, book, books, library,
