 Bereznyak, Isaev and Chertok visited RNII in March 1941, but the new rocket engine was not working yet.The engine was designed by Leonid Dushkin, who had made the RD-A-150 for the Korolyov RP-318-1.Powered by tractor kerosene and red fuming nitric acid, it fell short of the hoped for thrust and the D-1-A-1100 was expected to reach .