SK 50 - Saab 91 Safir
The Saab 91 Safir (Swedish: "sapphire") is a three (91A, B, B-2) or four (91C, D) seater, single engine trainer aircraft. The Safir was built by Saab AB in Linköping, Sweden, (203 aircraft) and by De Schelde in Dordrecht, Netherlands (120 aircraft).
More images and high rez versions here: http://www.e-pic.se/Aircraft/Aircraft-sorted-by-type/SAAB/SAAB-91-Safir--SK-50/
The Safir's first flight was 20 November 1945. The all-metal Safir was designed by Anders J. Andersson, who had previously worked for Bücker, where he designed the all-wood Bücker Bü 181 "Bestmann". The Safir thus shared many conceptual features of its design with the Bestmann.
The Saab 91A is powered by a 125 hp four cylinder de Havilland Gipsy Major 2c piston engine, or a 145 hp Gipsy Major 10 piston engine. The 91B, B-2 and C have a six-cylinder Lycoming O-435A engine with 190 hp. The 91D has a four-cylinder Lycoming O-360-A1A engine with 180 hp.
The 91B-2 is a 91B variant for Royal Norwegian Air Force with minor modifications, mainly a constant speed propeller.
The "Safir" was later used as a platform to test at low speeds the new swept wing for the Saab 29 and Saab 32 jet fighter
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