Yakovlev Yak - 200 The Yakovlev Yak - 200 was a prototype Soviet multi - engine trainer built during the 1950s . A modified version was built as the Yak - 210 for navigator training , but only one example of each was built before the program was cancelled in 1956 . Development . The Yakovlev OKB began work in February 1951 on an aircraft that could be used as a cheap bomber trainer as the Yak - UTB ( " oochebnotrenirovochnyy bombardirovshchik " — bomber trainer ) , but this was quickly split into two closely related versions , the Yak - 200 for pilot training and the Yak - 210 for navigator / bombardier training . The primary difference between them was in equipment ; the Yak - 200 lacked all of the specialized navigation and bombardier gear . The Yak - 200 was a mid - winged , twin - engined monoplane with a tricycle undercarriage . The metal - skinned , semi - monocoque fuselage was built in three sections with side - by - side seating for the crew . The nose was glazed with an optically flat panel and lacked a seat or any equipment . The control surfaces of the tail were fabric - covered although the tail itself was metal - skinned . The one - spar metal wing was made in three pieces with detachable trapezoidal outer panels . The ailerons were covered with fabric , as were the flaps in the outer wing panels , but the flaps in the center section were metal - skinned . The main undercarriage legs retracted forward into the engine nacelles , while the nose leg retracted backwards . Two Shvetsov ASh - 21 radial engines powered the Yak - 200 and drove variable - pitch VISh - 11V - 20A propellers . The Yak - 210 carried a full suite of navigation equipment with which to train naviagators . The main distinguishing characteristic between it and the Yak - 200 was an external radome under the rear fuselage for the PSBN - M ( " pribor slepovo bombometahniya i navigahtsii " — blind - bombing and navigational device ) search / bomb - aiming radar as was fitted on the Ilyushin Il - 28 . An OPB - 6SR ( " opticheskiy pritsel bombardirovochnyy " — optical synchronized bombsight ) and a AFA - BA - 40 camera were also fitted ; the latter could tilt 15° aft to record bomb impacts . All this equipment weighed which forced the fuel load to be reduced by in compensation . Seats were fitted in the nose for the trainee navigator and his instructor . The Yak - 200 prototype made its first flight on 10 April 1953 and it underwent its State acceptance trials between 29 July and 10 September . These revealed a number of problems including poor handling , insufficient longitudinal stability and significant changes in trim as engine power was changed . Other problems included the lack of anti - icing devices for the windshield and the propeller blades . Remedies included adding a extension in the fuselage and a dorsal fillet to correct the stability issues . The wings were raised by and their dihedral was reduced . These changes moved the aircraft ' s center of gravity forward and it became simple and pleasant to fly , even though its empty weight increased by and its gross weight by which did include some additional fuel . The Yak - 210 first flew on 1 August 1953 and it received some of the improvements given to the Yak - 200 including the dorsal fin . Its radome was changed from its initial oval shape to a teardrop during testing . It could carry of practice bombs . All these modifications required time and the VVS ultimately decided that the Il - 28U trainer met its requirements , despite the extra costs involved , and the program was cancelled .