Question

Which of the following is the correct formula of ground run distance with respect to aircraft weight?

(a) SG=\(\frac{WV_{LOF}^2}{2g[F_N+D+\mu (W-L)]_{0.7V_{LOF}^2}}\)

(b) SG=\(\frac{WV_{LOF}^2}{2g[F_N-D+\mu (W-L)]_{0.7V_{LOF}^2}}\)

(c) SG=\(\frac{WV_{LOF}^2}{2g[F_N+D-\mu (W-L)]_{0.7V_{LOF}^2}}\)

(d) SG=\(\frac{WV_{LOF}^2}{2g[F_N-D-\mu (W-L)]_{0.7V_{LOF}^2}}\)

This question was posed to me in class test.

The doubt is from Effect on the Take-off Distances of Flight Variables topic in section Take-off and Landing Performance of Aircraft Performance

Answer 1

The correct option is (d) SG=\(\frac{WV_{LOF}^2}{2g[F_N-D-\mu (W-L)]_{0.7V_{LOF}^2}}\)

Explanation: The formula for the ground run distance with respect to aircraft weight is given by SG=\(\frac{WV_{LOF}^2}{2g[F_N-D-\mu (W-L)]_{0.7V_{LOF}^2}}\) where W is weight, V is velocity, L is lift, D is drag, g is acceleration due to gravity and μ is runway coefficient of rolling friction.