Both were simple, high-wing and open frame (flat, uncovered girder fuselage) gliders in the style of the earlier German Zögling.

With LOPP funding five pre-production airframes were built by Warsztaty Szybowcowe, the first flying from Mokotów on 30 September 1932 piloted by Mieczysław Jonikas.

Its narrow, triangular tailplane, mounted on the upper longeron, carried rectangular elevators with a deep cut-out for rudder movement.

Extended exposure to novice pilots revealed a tendency to enter a spin at high angles of attack caused by over-sensitive elevators.

Construction drawings, materials and parts were sold, with at least 50 aircraft built by clubs and similar organizations.