 By the Autumn of 1940, they were able to show fellow engineer Boris Chertok a preliminary design of "Project G".The design, made up mostly from plywood and duralumin had a take-off weight of , and they planned to use the new rocket engine under development in the RNII ("Raketnyy Nauchno-Issledovatel'skiy Institut" – reaction engine scientific research institute).Chertok was astounded that the aircraft could almost climb vertically.