A subsidiary spar carries plain flaps inboard, mass balanced and sealed ailerons, divided into two sections, outboard.

The fuselage deepens forward, with a fixed skid for landing, aided by a tail bumper The Košava was launched on a drop-off wheeled dolly.

The tandem cockpit has a long, low, level topped multi piece blown canopy which extends aft to about mid-chord where it is faired into the fuselage.

After winning the Yugoslavian National Championship, it achieved third place at the first German gliding competition allowed after World War II, held at Oerlinghausen.

The following year the Košava came to the UK for the World Gliding Championships (WGC) at Camphill; flown by Božidar Komac and Zvonimir Rain, it won the two seater competition by a large margin.