High-pressure pumps for larger missiles had been discussed by rocket pioneers such as Hermann Oberth. 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.[1]:80 The V-2 rocket design used hydrogen peroxide decomposed through a Walter steam generator to power the uncontrolled turbopump[1]:81 produced at the Heinkel plant at Jenbach,[2] so V-2 turbopumps and combustion chamber were tested and matched to prevent the pump from overpressurizing the chamber.[1]:172 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.[1] The first successful V-2 launch was on October 3, 1942.[3]