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