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The 1950s was the decade of the test pilot and the experimental aircraft, as aviation technology turned to the jet engine and pushed its limits in both speed and endurance. With the world divided in Cold War, the stakes were high. Jet aircraft dominated both U.S. and Soviet arsenals and the data returned by subsonic and supersonic test flights had implications for the coming space race as well.
A number of aviation companies turned out experimental aircraft, primarily for the armed forces. The pilots who flew them measured success in ways their predecessors could only dream of. They set records for speed and altitude that were unimaginable only a few years earlier, piloting aircraft that were volatile, unpredictable and often flat-out dangerous. When the time came to select astronauts for the nascent U.S. space program, it's not surprising that NASA recruiters turned to their ranks seeking the guys with the right stuff.
Hiller X-18
The X-18 was designed to test tilt-wing and short-takeoff-and-vertical-landing technology. Only one was built.
Photo: U.S. Air Force
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