After some time designing more conventional types and becoming Technical Head of the RRG in 1925 he returned to the tailless glider layout.

Following the standard practice of the time the wing had a single spar, with plywood covering ahead of it, forming a torsion resistant D-box.

As on the Storch, the wing tips were cropped and carried small, roughly triangular, ply-covered fins mounting longer, rounded rectangular, fabric covered rudders.

[1][4][5] The addition in 1931 of a pusher configuration, 30 hp (22 kW), horizontally opposed Bristol Cherub III well above the rear of the wing with its small, metal, two-bladed propeller just beyond the trailing edge significantly altered the fuselage, though it did not lengthen it.

The lower fuselage was modified by a fixed, tricycle undercarriage with closely spaced, trousered main legs, rubber-sprung mainwheels with low pressure tyres, a shrouded, steerable nosewheel and a little tailwheel.

[3] Though take-offs have been described as "difficult",[1] Groenhoff said it was light on the controls and capable of any manoeuvres expected of conventional aircraft including a loop.

Independent observers at a demonstration did not see the latter but were impressed with its manoeuvrability, its apparent reserves of power, despite the small engine, and its reluctance to stall.