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A vehicle is required to cruise at Mach 6 for a sustained period within the atmosphere.

Which propulsion type is appropriate and what is the central difficulty?

  • A.A turbofan, whose difficulty is compressor stall
  • B.A turboprop, whose difficulty is propeller tip speed
  • C.A rocket, whose difficulty is oxidiser mass
  • D.A scramjet, limited by fuel mixing

Answer: D

Slowing hypersonic flow to subsonic speed would raise the temperature beyond any material's limit, so combustion must occur in supersonic flow. The fuel has milliseconds to mix and burn, which is the problem that has kept the concept experimental.

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