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If bypass ratio of subsonic non afterburning engine is found to be 2.1 then, what will be the specific fuel consumption of the same engine at cruise?

If bypass ratio of subsonic non afterburning engine is found to be 2.1 then, what will be the specific fuel consumption of the same engine at cruise? Correct Answer 0.8

Given, BPR = 2.1. Now, SFC at cruise is given by, SFC = 0.88*e (-0.05*BPR) = 0.88 * e (-0.05*2.1) = 0.7922 = 0.8.

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