An aircraft is operating with CL of 1.5 and has power required of 120W. If we want to reduce the power required by half then, find the value of CL at this power required condition. Consider steady level flight.(a) 2.38(b) 1.946(c) 9.45(d) 5.59The question was posed to me by my school principal while I was bunking the class.I need to ask this question from Flight Mechanics in section Performance and Flight Mechanics of Aircraft Design

An aircraft is operating with CL of 1.5 and has power required of 120W

1.	An aircraft is operating with CL of 1.5 and has power required of 120W. If we want to reduce the power required by half then, find the value of CL at this power required condition. Consider steady level flight.(a) 2.38(b) 1.946(c) 9.45(d) 5.59The question was posed to me by my school principal while I was bunking the class.I need to ask this question from Flight Mechanics in section Performance and Flight Mechanics of Aircraft Design
Answer» Right answer is (a) 2.38 Explanation: GIVEN, P1 = 120W, CL1 = 1.5, P2 = P1/2 = 120/2 = 60W. Now, CL for new POWER required P2 is given by, CL2 = CL1[P1/P2]^(2/3) = 1.5[120/60]^(2/3) = 2.38.

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