which german company built the first aircraft to fly under turbojet power
Heinkel He 178 The Heinkel He 178 was the world's first aircraft to fly under turbojet power, and the first practical jet aircraft. It was a private venture by the German Heinkel company in accordance with director Ernst Heinkel's emphasis on developing technology for high-speed flight. It first flew on 27 August 1939, piloted by Erich Warsitz. This flight had been preceded by a short hop three days earlier.
Fastest propeller-driven aircraft Speeds of all-metal monoplanes of the 1930s jumped into the 700 km/h (430 mph) range with the Macchi M.C.72 reaching a top speed of 709 km/h (441 mph), still the record for piston-powered seaplanes.[13] The Messerschmitt Me 209 V1 set a world speed record of almost 756 km/h (470 mph) on 26 April 1939,[14] and the Republic XP-47J (a variant of the P-47 Thunderbolt) is claimed to have reached 813 km/h (505 mph) in testing[citation needed]. A prototype of the successor to the Supermarine Spitfire, the Supermarine Spiteful F.16 (RB518), reached 494 mph (795 km/h). The fastest German propeller driven aircraft to see combat in WWII was the twin-DB 603-powered Dornier Do 335 "Pfeil" which had a top speed of 763 km/h (474 mph).[15]