An engine which produces an efflux of high speed will be
- less efficient.
- more efficient.
- unaffected by efflux speed.
Explanation
Propulsive efficiency depends on the difference between jet efflux speed and aircraft speed; a large, high-velocity efflux leaves much kinetic energy in the wake as wasted energy. Accelerating a larger mass of air to a lower velocity gives the same thrust more efficiently, which is why high-bypass engines are more efficient than pure jets.
paulofly@yahoo.com asking:
Hi, what is high speed efflux?
Thanks
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