His first secondary glider, the 1926 RRG Prüfling, was disappointing, with a performance not much better than some contemporary primaries; lacking inherent stability its handling was not good either.

After that design Lippisch had been working on aircraft which relied on wing sweep to provide stability in pitch, having no horizontal tail.

The wing of the Storch IV was swept at about 17° and carried lobate ailerons which extended behind the rest of the trailing edge and were hinged at right angles to the fuselage line.

[1] The Falke's fuselage had a hexagonal cross section with deep vertical sides and was ply covered from the nose to the rear of the cockpit.

The broad tailplane, mounted on top of the fuselage ahead of the fin to which it was braced with single strut on each side, had straight swept leading edges and square tips and carried elevators that were rectangular apart for a cut-out for rudder movement.

The glider landed on a long, rubber sprung skid reaching from the nose to well behind the cockpit, assisted by a faired tailskid.