This is a carbon fibre monocoque with a starboard side door for access to the single-seat cockpit.

A conventional tricycle undercarriage is mounted on the fuselage with spring steel cantilever legs bearing the mainwheels.

The rear underside of the fuselage tapers upwards to the tail, where a constant chord tailplane carries a single piece elevator between two endplate fins.

[1] The Robust is powered by a German 41 kW (55 hp) Hirth 2703 twin-cylinder in-line two-stroke engine, driving a three-blade propeller via reduction gearing.

This would have a span increased to 11.40 m (37 ft 5 in), a maximum take-off weight of 495 kg (1,091 lb) and be powered by a 60 kW (80 hp) Volkswagen 2300 engine.