Aircraft Cooperative Mechta Russia AC-4 Avia Stroitel AC4
A runner up in the OSTIV world class sailplane design contest in Oerlinghausen in 1993, the AC-4 went into production following modifications that had been recommended by the Organisation Scientifique du Vol a Voile (OSTIV). The Russia comes in the taildragger AC-4A model, and the AC-4B with main wheel set behind the center of gravity and a nose wheel. The latter has a slightly more spacious cockpit able to accept taller pilots. The AC-4 is offered with a ballistic emergency recovery parachute. It can be fitted with a 12 bhp / 9 kW McCulloch MC-101B 2 cycle sustainer engine. The first flight of the AC-5m was in December 1999. Designed by Vladimir Federov.