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| | X-15 |
 | | While Lindbergh's plane was focused on flying from New York to Paris, the X-15 existed solely to test how man and machine would react to flying higher and faster than ever before. |
 | | The X-15 was powered by a rocket engine, first the "small" engine, and then by the XLR-99, a monster with 57,000 pounds of thrust, almost comparable to the Mercury Redstone rocket that launched Alan Shepard and Gus Grissom. |
 | | During this rebuilding, the number 2 plane was re-fitted with jettisonable external fuel tanks, a ramjet engine, and an ablative coating to dissipate the extreme heat built up at hypersonic speeds. |
| www.acepilots.com /planes/x15.html (2043 words) |
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