In the 1980s, Kuznetsov continued to develop powerful contra-rotating engines. The NK-110, which was tested in the late 1980s, had a contra-rotating propeller configuration with four blades in front and four in back, like the NK-12. Its was smaller than the NK-12's diameter, but it produced a power output of , delivering a takeoff thrust of . Even more powerful was the NK-62, which was in development throughout most of the decade. The NK-62 had an identical propeller diameter and blade configuration to the NK-110, but it offered a higher takeoff thrust of . The associated NK-62M had a takeoff thrust of , and it could deliver of emergency thrust. Unlike the NK-12, however, these later engines were not adopted by any of the aircraft design bureaus.