It had a new forward fuselage with an enclosed cockpit with two side-by-side seats and originally a Hirth F10A2a engine in the nose.

After an initial batch of aircraft the wing was lowered and it was renamed as just the SF-25B Falke.

A number of variants were built with various engines and the type was licence built by Sportavia-Putzer, Aeronautica Umbra (Italy), Loravia (France) and Slingsby (United Kingdom).

Byron Bay gliding club (Australia) have re-engined using a Jabiru 2200.

"We get a sound 500 ft/min climb rate measured with a logger and this aircraft will take an honest 190kg pay load with 1 hour of fuel"[3]