Discussion
Improving \( L/D \) from \( 18 \) to \( 20 \) at constant everything else changes the range by
Answer: A
Correct answer: About 11 per cent
The Breguet range equation makes range directly proportional to lift-to-drag ratio at constant weight fraction and specific fuel consumption, so
\[ \frac{20}{18} = 1.111 \]an improvement of about 11 per cent. Two points of \( L/D \) is a substantial aerodynamic achievement, and the fact that it converts one for one into range is why so much design effort goes into drag reduction.
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