The Lockheed X-7 (as "flying stovepipe " hereinafter) was an unmanned test aircraft for ramjet engines and flight technology. It was worn by a bomber of the type B- 29 or B-50.
The booster rocket lit when launched and accelerated the X - 7 to a speed of 1,625 km / h The launch vehicle was then discarded, and the ramjet engine assumed from this point on the actuator. The X-7 eventually landed on a parachute. The X-7 reached a maximum speed of 3,250 km / h and then set the record as the fastest plane on which utilized the atmospheric oxygen for combustion of its fuel. From April 1951 to July 1960 a total of 130 flights were performed.