You are turning 90 RPM, with a propeller pitch of 24 feet, and an estimated slip of - 3%. What is the speed of advance?

Correct Answer: Option C — 21.9 knots

Speed of advance is determined using propeller RPM, pitch, and slip percentage via the standard formula: Speed = (RPM x Pitch x 60) / 6080 x (1 - Slip). Factoring negative slip as an additive percentage yields 21.9 knots.