You are turning 100 RPM, with propeller pitch of 25 feet, and an estimated negative slip of 5%. What is the speed of advance?

Correct Answer: Option B — 25.9 knots

Applying negative slip mathematically increases effective propeller advance. Multiplying 100 RPM by a 25-foot pitch and factoring in a 5% negative slip adjustment results in a true speed of advance of 25.9 knots.