X-Plane 9.70 – Yakovlev C-11 1.2. The Yakovlev Yak-11 “Moose” was a trainer aircraft used by the Soviet Air Force and other Soviet-influenced air forces from 1947 until 1962. In total, Soviet production amounted to 3859 aircraft between 1947 and 1955. with a further 707 licence-built by Let in Czechoslovakia as the C-11, which is the aircraft represented here. Three liveries are also included. By Thibaud Duhamel.