 In mid-1935 Wernher von Braun initiated a fuel pump project at the southwest German firm "Klein, Schanzlin & Becker" that was experienced in building large fire-fighting pumps.The V-2 rocket design used hydrogen peroxide decomposed through a Walter steam generator to power the uncontrolled turbopump produced at the Heinkel plant at Jenbach, so V-2 turbopumps and combustion chamber were tested and matched to prevent the pump from overpressurizing the chamber.The first engine fired successfully in September, and on August 16, 1942, a trial rocket stopped in mid-air and crashed due to a failure in the turbopump.