.During 1949-50 Master of Technology M.V.Sukhanov built an experimental single seat glider having a wing and control surfaces circular in planform, which he called Discoplan-I. The wing diameter was 3.5 m / 11 ft 6 in, and the gross weight was 230 kg / 507 lb.
The flight trials of the Diskoplan-I were carried out under the direction of the designer by a team of young engineers from the Voluntary Society for Assisting Army, Air Force and Navy, and covered aerobatics. It proved absolutely spin-proof.
It was flying in 1957.
All Aero 