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?
Messerschmitt Me 263: 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. Messerschmitt Me 263:  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. Messerschmitt Me 163 Komet:  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.
i don't know