The McDonnell Douglas F3H Demon was a pivotal U.S. Navy carrier-based fighter that served during the 1950s and early 1960s. Though often overshadowed by its legendary successor, the McDonnell Douglas F-4 Phantom II, the F3H Demon played a critical transitional role in naval aviation history—bridging the gap between early straight-wing jets and the supersonic missile-armed fighters of the Cold War. McDonnell Douglas F3H Demon Origins and Development of the F3H Demon The F3H Demon was developed by McDonnell Aircraft Corporation in response to a U.S. Navy requirement for a high-performance carrier-based fighter capable of countering emerging Soviet jet threats during the early Cold War. Initially conceived in the late 1940s, the aircraft was designed as a swept-wing, single-engine jet with radar and missile capability—advanced features for its time. However, early development was troubled by severe engine reliability issues with the Westinghouse J40 turbojet, leading to redesigns and...