Xtreme Prototypes, Inc.
7
Commercial
First aircraft to test the million-horsepower XLR-99 rocket engine in flight.
Xtreme Prototypes, Inc.
2
Commercial
Xtreme Prototypes X-15A-2 is an addon for Microsoft Flight Simulator.
Xtreme Prototypes, Inc.
2
Commercial
It was the first of three experimental X-15 aircraft built in the late 1950s.
