As well as their structural similarity, the Kria and the Phönix shared some aerodynamic features, particularly Eppler airfoils and fuselages which conformed to the upward flowing air ahead of the wings and downwash behind.
The wings carried short span ailerons at the tips and undersurface airbrakes, which could be extended at 90° to the airflow, inboard.
[1] The airflow-conforming aerodynamics of the fuselage gave it a rather humped back profile, with the dorsal line dropping away aft of the wing to a slender tail.
The underside of the forward fuselage was bulged and carried a close-fitting landing skid, which was assisted by an integral tail bumper.
It flew from their Hahnweide base for several years, also participating in glider evaluation courses under OSTIV auspices.