FS2004/FSX Yak 11 Fighter Trainer. The Yak-11 design was based in large parts on the successful Yak-3 fighter. It became the Soviet Air Force’s most widely used trainer aircraft and the standard fighter trainer in most east block countries. When the Yaks were withdrawn from military service, many were sold for private use and painted to resemble warbirds. Complete plane by A.F. Scrub.