Designed by Dr. Eng. Leszek Dulęba, the CSS-12 airliner was the first all-metal aircraft built in Poland after World War II.
Construction: metal, the cabin accommodated 2 crew and 10 passengers. Landing gear retractable in flight. The drive consisted of two in-line 12-cylinder Argus As411 A1 engines, with a power of 427 kW (580 hp) each.
The prototype flew on November 22, 1950. by L. Lech. After a year, the trials were discontinued, as the priority was given to the serial production of military aircraft. Work was resumed in 1955, as a result of which a second horizontal stabilizer was added. The prototype showed good flight characteristics and performance (Eng. A. Abłamowicz set an international altitude record on it), but the lack of interest in the aircraft on the part of LOT Polish Airlines and the lack of appropriate engines meant that the CSS-12 did not go into mass production. After the aircraft was written down in 1960, the front part of the fuselage was transferred to the NOT Museum of Technology in Warsaw, and the remaining part of the fuselage with wings was placed in the Jordan garden of WSM Sady Żoliborskie in Warsaw. In February 1967, the front part of the fuselage was transferred to the Museum of Aviation and Aeronautics in Krakow.
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