Question

Determine the value of drag at which we can have minimum power if given reference area is 10m^2 and zero lift drag coefficient is 0.5. Consider q as 120Pa.

(a) 2400N

(b) 1.25

(c) 9.85

(d) 4500 KN

The question was asked during an online interview.

Asked question is from Flight Mechanics in chapter Performance and Flight Mechanics of Aircraft Design

Answer 1

Correct option is (a) 2400N

The explanation is: Drag at minimum power = q*area*[4*zero lift drag coefficient]

= 120*10*4*0.5 = 2400N.