Which of the following is the correct performance equation for power-producing engines?(a) ηV=PD(b) ηD=PV(c) ηP=VD(d) V=ηPDI got this question in a job interview.The query is from Range and Endurance for Aircraft with Power Producing Engines in division Cruising Performance of Aircraft Performance

Which of the following is the correct performance equation for power-p

1.	Which of the following is the correct performance equation for power-producing engines?(a) ηV=PD(b) ηD=PV(c) ηP=VD(d) V=ηPDI got this question in a job interview.The query is from Range and Endurance for Aircraft with Power Producing Engines in division Cruising Performance of Aircraft Performance
Answer» The correct OPTION is (c) ηP=VD To explain I would say: The correct EQUATION for PERFORMANCE equation is ηP=VD where ŋ is propeller efficiency, P is drag power, D is drag and V is velocity. In a power-producing engine the shaft power is PRODUCED as well as propulsive thrust produced by the propeller which is converted into power.

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