 All these changes added of weight and increased drag which reduced the aircraft's top speed by , and slowed its time to from 4.8 to 7.2 minutes in comparison to the unmodified aircraft.Given that a higher-performance design, the Aircraft 156, had already been submitted for state acceptance trials, Semyon Lavochkin decided not to continue the development of the 150M.In the meantime, the OKB had been developing two afterburning versions of the RD-10 in an effort to increase the engine's power.