Question

The round bracket in the accelerating force represents the drag- lift ratio at the ground angle of attack.

(a) True

(b) False

The question was asked in examination.

Enquiry is from Estimation of Take-off Distances topic in section Take-off and Landing Performance of Aircraft Performance

Answer 1

The correct choice is (a) True

Best explanation: The formula for accelerating force is given by: \(\frac{F}{W}=\Big\{\frac{F_N}{W}-\mu_R-sin\gamma_R\Big\}-\frac{L}{W}\Big(\frac{C_D}{C_L}-\mu_R\Big)\) where F is force, W is weight, μR is runway coefficient of the rolling friction, γR is runway slope, L is lift, CD and CL are the coefficients of drag and lift. The round bracket in the accelerating force represents the drag- lift ratio at the ground angle of attack.