Gribovski G-11 Glider
The life of this aircraft, intended for transportation of 6 men and being planned at the same time as the G-9 in 1932, was rather short. In many respects the G-11 repeated the destiny of the earlier G-3 glider. As with the G-3, it had twin-fuselage layout but the main difference was spacious 3-seat enclosed cabins with doors in each fuselage.
The manufacturing of the G-11 was delayed and in 1933 the governing body of "Osoaviakhim" decided to stop it entirely, though the general completeness of the glider was estimated at the level of 80 %. A motorized transport variant, known as the M-11M was built in 1935. This powered version incorporated a 100 hp M-11 engine.
The designation was also used in some wartime papers in relation to the G-29 military assault glider design.
Sources:
•Airplanes and Gliders of V.K.Gribovsky by Mikhail Maslov
•Soviet Gliders by Rysov, U.A.
•Bulletin of the Russian Aviation Research Group