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If lift coefficient at thrust required minimum is 0.85 and induced drag factor K is 0.0085 then, find the approximate value of drag coefficient at zero lift.(a) 0.0061(b) 0.061(c) 0.61(d) 6.1The question was asked in my homework.I'd like to ask this question from Flight Mechanics topic in chapter Performance and Flight Mechanics of Aircraft Design

Answer» RIGHT option is (a) 0.0061

The explanation is: GIVEN, CL as 0.85 and K as 0.0085.

Now, ZERO LIFT drag coefficient for given conditions,

CD0 = CL2/K = 0.85*0.85/0.0085 = 0.0061.


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