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358 - FAA PPL(A) USA - Skin friction drag can be somewhat reduced by:

Question 358 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

Flush riveting, smooth paint, and waxing
Adjusting the angle of the props
Keeping the intersection of different parts more streamlined

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Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane