This infamous aircraft was orginally came out of design for a high-speed bomber, but that designwas rejected and was "put away" until in late WWII Germany needed something fast that could take down the marauding Allied bombers, this aircraft was then redesigned to become a heavy fighter/interceptor, When tested it was nice to fly, and it was put into production though in limited numbers, the Do-335 was really fast for a prop moving at speeds of 470mph, becuase of this there was a story of French pilot flying in the RAF who spotted a Do-335 and when he tried to attack it the Do-335 simply turned and accelerated away at such speeds the pilot believed it was a new German jet, though it had limited success mostly becuase the war was basially over, like mos German prototypes it was taken by the US and flight tested multiple still survive today with the most complete version is on display in the National Air and Space Museum in Washington DC (activator 1 to ignite engines)