Question: What is the name of a German rocket-powered fighter aircraft designed by Alexander Lippisch, the original version being the first to exceed 1000km/h and the subsequent version, known as the Me 263 Scholle having had 3 prototypes, non of which were ever flown?
Context: The DFS 194 was a rocket-powered aircraft designed by Alexander Lippisch at the "Deutsche Forschungsanstalt für Segelflug" (DFS - "German Institute for Sailplane Flight"). The Lippisch Wien was a high performance glider designed by Alexander Lippisch in Germany in 1929.  Owned and flown by Robert Kronfeld, it was one of the first sailplanes intended to exploit thermals.  It set world records both for distance and altitude and demonstrated the practicality of long distance cross country flights. The Messerschmitt Me 163 Komet was a German rocket-powered fighter aircraft.  Designed by Alexander Lippisch, it is the only rocket-powered fighter aircraft ever to have been operational and the first piloted aircraft of any type to exceed 1000 km/h (621 mph) in level flight.  Its design was revolutionary and its performance unprecedented.  German test pilot Heini Dittmar in early July 1944 reached 1130 km/h , an unofficial flight airspeed record unmatched by turbojet-powered aircraft for almost a decade.  Over 300 aircraft were built, but the Komet proved ineffective in its dedicated role as an interceptor aircraft and was responsible for the destruction of only about nine to eighteen Allied aircraft against ten losses.  Aside from combat losses many pilots were killed during testing and training. The Ente (German: "duck" ) was the world’s first rocket-powered full-size aircraft.  It was designed by Alexander Lippisch as a sailplane and first flown under power on June 11, 1928, piloted by Fritz Stamer. The DFS 228 was a rocket-powered, high-altitude reconnaissance aircraft designed by the "Deutsche Forschungsanstalt für Segelflug" (DFS - "German Institute for Sailplane Flight") during World War II.  By the end of the war, the aircraft had only flown in the form of two unpowered prototypes. The Lippisch P.13a was an experimental ramjet-powered delta wing interceptor aircraft designed in late 1944 by Dr. Alexander Lippisch for Nazi Germany.  The aircraft never made it past the drawing board, but testing of wind-tunnel models in the DVL high-speed wind tunnel showed that the design had extraordinary stability into the Mach 2.6 range. The Lippisch P.13b was a World War II German ramjet powered fighter aircraft designed by Alexander Lippisch.  Designed in December 1944, the P.13b was a further development of the similarly delta-winged Lippisch P.13a, which was also a ramjet fighter.  The cockpit was located in the nose of the fuselage, and was mounted forward of the delta wing, which featured downturned wing tips.  Main landing gear comprised a retractable skid, while the rear of the aircraft would rest on the reinforced wing tips. The Messerschmitt Me 263 "Scholle" (plaice) was a rocket-powered fighter aircraft developed from the Me 163 "Komet" towards the end of World War II.  Three prototypes were built but never flown under their own power as the rapidly deteriorating military situation in Germany prevented the completion of the test program. The FMA IAe 33 Pulqui II (in the indigenous language Mapuche, "Pulqúi": Arrow) was a jet fighter aircraft designed by Kurt Tank in the late 1940s in Argentina, under the Perón government, and built by the "Fábrica Militar de Aviones" (FMA).  Embodying many of the design elements of the wartime Focke-Wulf Ta 183, an unrealized fighter project, the FMA envisioned the IAe 33 Pulqui II as a successor to the postwar Gloster Meteor F4 in service with the "Fuerza Aérea Argentina".  The Pulqui II's development was comparatively problematic and lengthy, with two of the four prototypes being lost in fatal crashes.  Despite one of the prototypes being successfully tested in combat during the "Revolución Libertadora", the political, economic and technical challenges faced by the project meant that the IAe 33 was unable to reach its full potential, and the Argentine government ultimately chose to purchase F-86 Sabres from the United States in lieu of continuing development of the indigenous fighter to production status. The DFS 40 (originally developed as the Delta V) was a tail-less research aircraft designed by Alexander Lippisch in 1937 as a follow-on to his Delta IV aircraft.  In construction, the DFS was closer to a flying wing than its predecessor, and was built as an alternative to that aircraft.
Answer: Messerschmitt