Highest Altitude for Manned Flight: X-15 Rocket Plane

While the SR-71 Blackbird set an altitude record for sustained horizontal flight in an air-breathing aircraft at 85,069 feet, the North American X-15 rocket plane holds the unofficial record for highest manned flight within the atmosphere, exceeding 354,200 feet (67 miles) in 1963.

The top 3

  1. Pilot Who Soared Highest: Joseph A. Walker's Record Flight: On August 22, 1963, NASA pilot Joseph A. Walker achieved the X-15's highest altitude, reaching 354,200 feet (107.96 kilometers or 67.08 miles) during Flight 91. This record for a crewed spaceplane stood until the Space Shuttle Columbia flight in 1981. Joseph A. Walker
  2. X-15 Pilots: Earning Astronaut Wings Beyond the Kármán Line: Eight X-15 pilots, including Joseph A. Walker, earned astronaut wings by exceeding the U.S. Air Force's 50-mile (80 km) altitude threshold. Walker's record flights also surpassed the FAI's Kármán line at 100 km (62 miles), officially marking the edge of space.
  3. Engineering Marvel: How X-15 Reached Near-Space Altitudes: The X-15 achieved extreme altitudes through key innovations: it was air-launched from a B-52 bomber at 45,000 feet, then ignited its powerful XLR-99 rocket engine. For control in thin air, it used a Reaction Control System (RCS) with hydrogen-peroxide thrusters, and its Inconel-X skin protected against intense heat during reentry.

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