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Fixed typos, added tags -- Be aware the part relative to SFC misses a verb (it decreases?)
mins
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What is the effect of Mach number on efficiency, thrust and specific fuel consumption of a ramjet engine?

My graphs show that overall efficiency and thrust first increase, reach a peak and then fall in the supersonic range (M=1-5) whereas SFC first and then increases rapidly near M 5.

Why does this happen?