The GB-6 was a two-seat high wing monoplane with tricycle undercarriage, built mainly of wood with fabric and plywood skinning. The enclosed cockpit sat under the straight, rectangular wing which was given a slight dihedral. Each wing tip ended in a shallow end-plate fairing. The tail had a conventional fin with rudder, but no
horizontal stabilizer. The wing was built using an original aerofoil section similar to the
NACA 23012, the trailing edge of which is reflexed upwards with reverse camber to prevent movement of the centre of pressure with angle of attack and in this way to obtain longitudinal stability. Control was achieved using the rudder and full-span elevons. Power was provided by a
Lutetia 4.C.02 2-stroke air-cooled V-4 engine. ==Operational history==