Discussion
A transport's cruise drag is \( 60 \) kN, of which half is skin friction. A riblet treatment cuts skin friction by \( 6 \) per cent. The saving in total drag is
Answer: D
The friction component is \( 30 \) kN and six per cent of that is \( 0.06 \times 30 = 1.8 \) kN, which is three per cent of the total. Small as it sounds, a three per cent fuel saving across a fleet is a large sum, which is why the idea keeps returning despite its practical difficulties.
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