| 11. | For the first decade he was engaged in aerodynamic research in the high supersonic and hypersonic speed ranges.
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| 12. | Scaling up the technology to the size needed to move an aircraft at hypersonic speeds will be challenging.
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| 13. | As the air enters the engine at supersonic / hypersonic speeds, it becomes very hot due to compression effects.
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| 14. | The flight will mark the first time an air-breathing plane flies at hypersonic speeds, or faster than Mach 5.
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| 15. | It would have been the first time an air-breathing plane flew at hypersonic speeds, or faster than Mach 5.
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| 16. | During descent, the orbiter passed through different layers of the atmosphere and decelerated from hypersonic speed primarily by aerobraking.
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| 17. | Some of the collapsing liner goes on to form a constantly stretching jet of material travelling at hypersonic speed.
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| 18. | This critical half-angle can be estimated using perfect gas theory ( this specific aerodynamic instability occurs below hypersonic speeds ).
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| 19. | Air-breathing designs typically fly at supersonic or hypersonic speeds, and usually include a rocket engine for the final burn for orbit.
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| 20. | :At hypersonic speeds, the linear model described in drag coefficient is totally inapplicable, so there's no real need for these charts.
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