Revived after World War I, by 1926 it had workshops in Lwów which began building the glider designs of ZASPL member Wacław Czerwiński.

The successful Czerwiński CW III, a 1929 open frame introductory glider, had shown the utility of the type for basic training but it was expensive and ready for development.

In response, Czerwiński and Władysław Jarworski designed the CWJ (a fusion of their initials) to fill the national gliding clubs' needs.

[1] The fuselage of the CWJ was essentially an uncovered pine Warren girder, though the rear part of the lower longeron or chord was upward-curved.

[2] An improved version, the CWJ-bis Skaut (Scout) made its first flight on 3 August 1933 at Czerwony Kamień, the base of the Lwów Aeroclub Gliding School.