Question

Find the velocity required for maximum range. Consider a sailplane has wing loading of 110N/m^2 and K/CD0 of 0.35.

(a) 10.3m/s

(b) 10.3mph

(c) 12.5mph

(d) 9.2mph

I have been asked this question during a job interview.

My question comes from Flight Mechanics in section Performance and Flight Mechanics of Aircraft Design

Answer 1

Correct option is (a) 10.3m/s

Easy explanation: Velocity = \(\sqrt{\frac{2*wing \,loading*\sqrt{K/CD0}}{density}}\)

= \(\sqrt{\frac{2*110*\sqrt{0.35}}{1.225}}\)

= \(\sqrt{106.24}\) = 10.3 m/s.