A larger follow-on version with a small propeller engine started as the DFS 194. Their first design was a conversion of the earlier Lippisch Delta IV known as the DFS 39 and used purely as a glider testbed of the airframe. Work on the design started around 1937 under the aegis of the Deutsche Forschungsanstalt für Segelflug (DFS)-the German Institute for the study of sailplane flight. Position of the Walter HWK 109-509A-1 rocket motor
This includes pilot Josef Pöhs, a fighter ace and Oberleutnant in the Luftwaffe, who was killed in 1943 by exposure to T-Stoff and injuries sustained during a failed takeoff that ruptured a fuel line. Aside from combat losses, many pilots were killed during testing and training, at least in part because of the highly volatile and corrosive nature of the rocket propellant used in later models.
More than 300 Komets were built, but the aircraft proved lackluster in its dedicated role as an interceptor, having destroyed between nine and 18 Allied aircraft against 10 losses. In early July 1944, German test pilot Heini Dittmar reached 1,130 km/h (700 mph), an unofficial flight airspeed record unmatched by turbojet-powered aircraft until 1953. Designed by Alexander Lippisch, its performance and aspects of its design were unprecedented. It is the only operational rocket-powered fighter aircraft in history and the first piloted aircraft of any type to exceed 1,000 kilometres per hour (620 mph) in level flight. The Messerschmitt Me 163 Komet is a German interceptor aircraft designed for point-defence.