By the end of World War II the brothers Reimar and Walter Horten were two of the best-known designers of flying wing aircraft in Germany They brought their experience in this field into a special unit which as Sonderkommando 9 was responsible for the development of tailless all-wing aircraft The development of the machine known as the Horten Ho IX equipped with two BMW 003A-1 jet engines began in 1942 Whereas the first machines could only be made as gliders due to difficulties with the jet engine the second prototype received a Jumo 004B-1 engine In 1944 the V2 made its first flight reaching speeds of over 780 kmh The production of the Horten was transferred to the Gothaer Waggonfabrik and the designation was changed to the Go 229 The first machine from the Gothaer Waggonfabrik the Go 229 A-O V3 received a Jumo 004-C engine