(Wojskowe Warsztaty Szybowcowe - Military Glider Workshops), Wacław Czerwiński designed the W.W.S.

The excellent handling properties, ideal for the solo training methods then in use, led to mass production in various workshops throughout Poland.

Due to lack of blueprints, the design was reverse engineered in the IS (Instytut Szybownictwa - Gliding Institute).

It was followed by improved variants Salamandra 49 and 53, produced also by other state-owned aviation factories throughout Poland, among others WSK Okęcie.

The high mounted wire braced wings were supported by struts from the bottom of the fuselage to approx 1/5 span.

Another marathon flight of 23 hours took place in Romania with a licence built version piloted by G. Braescu.