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Find the drag at which thrust required is minimum. Consider CD0 as 0.015 and reference area is 5m^2. Consider steady level flight with q of 15Pa.(a) 2.25N(b) 22.5N(c) 225N(d) 2250NThis question was posed to me during an internship interview.This intriguing question comes from Flight Mechanics topic in division Performance and Flight Mechanics of Aircraft Design

Answer»

The CORRECT OPTION is (a) 2.25N

Explanation: Given, steady level flight with CD0 of 0

015, q as 15Pa. Reference AREA S = 5m^2.

Now, drag at thrust required MINIMUM is given by,

D = 2*CD0*q*S = 2*0.015*15*5=2.25N.



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