Lockheed Martin is developing its own solution to the problem of operating an ISR in defended airspace, known as the SR-72, that relies on flying at hypersonic speeds.
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When the aircraft reaches hypersonic speed, it uses the heating energy from air friction to increase the heat capacity of the fuel ( " reform " the fuel ).
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This research may have inspired the British HOTOL program, which rather than airbreathing to high hypersonic speeds as with NASP, proposed to use a precooler up to Mach 5.5.
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The yearlong study by the Air Force Science Advisory Board foresees battles dominated by pilotless aircraft flying at hypersonic speeds and destroying enemy strongholds with highly accurate laser beams.
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If the high-risk flight is successful, it will mark the first time an exotic jet engine, called a supersonic-combustion ramjet or scramjet, has propelled a plane at so-called hypersonic speeds.
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But engineers say it should be able to fly 50 miles high at hypersonic speed, more than enough to prove its design and test its components under the harshest conditions.
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He also expressed the view that the altitude at which " Fireflash " is stated to be travelling would be optimal for a passenger aircraft travelling at hypersonic speeds.
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Both missions were designed to obtain data on " panel flutter " under high heating conditions and information of the vehicles'" unsteady aerodynamics " over a broad range of hypersonic speeds.
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The new weapons will be " capable of hitting targets continents away at hypersonic speed, with high precision and the ability of broad maneuver both in terms of altitude and direction of their flight,"
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It is clear that any object traveling at hypersonic speeds will likewise be exposed to the same extreme temperatures as the gas behind the nose shock wave, and hence choice of heat-resistant materials becomes important.
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