| http://www.w3.org/ns/prov#value | - The first flight of the XQ-1 prototype took place in 1950; 28 aircraft of the type were built.[1] Although the aircraft proved to be mostly satisfactory, the thirsty nature of the pulsejet engine limited the drone's endurance to a mere 60 minutes.[2] In an attempt to increase the potential flight time of the aircraft, one XQ-1 was re-engined with a Continental YJ69 turbojet replacing the pulsejet,
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