Question

Which of the following is the correct performance equation for mixed power-plants?

(a) Emaxsinγ2=\(\Big[\frac{\lambda}{u}+\tau \Big]-\frac{1}{2}[u^2+u^{-2}]\)

(b) Emaxsinγ2=\(\Big[\frac{\lambda}{u}-\tau \Big]-\frac{1}{2}[u^2-u^{-2}]\)

(c) Emaxsinγ2=\(\Big[\frac{\lambda}{u}+\tau \Big]-\frac{1}{2}[u^2-u^{-2}]\)

(d) Emaxsinγ2=\(\Big[\frac{\lambda}{u}-\tau \Big]-\frac{1}{2}[u^2+u^{-2}]\)

This question was addressed to me in an online quiz.

My doubt is from Climb and Descent Performance with Mixed Power Plants topic in section Climb and Descent Performance of Aircraft Performance

Answer 1

Right answer is (a) Emaxsinγ2=\(\Big[\frac{\lambda}{u}+\tau \Big]-\frac{1}{2}[u^2+u^{-2}]\)

Explanation: The correct performance equation for mixed power-plants is given by the formula Emaxsinγ2=\(\Big[\frac{\lambda}{u}+\tau \Big]-\frac{1}{2}[u^2+u^{-2}]\) where u is airspeed, γ is the angle at which the force is acting on the aircraft and τ is dimensionless thrust and Emax is endurance.