 This alarmed Bolkhovitinov's team, because their patron had a rocky history with Yakovlev, but Alexander Sergeevich and aircraft designer Ilya Florov studied the test results and gave them sound advice for improvements.Yaw instability was corrected by enlarging the rudder and adding two circular plates to the tail horizontal stabilizer.In October, both OKB-293 and RNII were evacuated to the Urals, along with most of Moscow's war industry.