You are turning 82 RPM, with a propeller pitch of 23 feet, and an estimated slip of +6%. What is the speed of advance?

Correct Answer: Option B — 17.5 knots

Speed of advance with slip is calculated as: Speed = ((RPM * Pitch * 60) / 6080) * (1 - Slip). Using 82 RPM, 23 feet pitch, and 6% positive slip (0.94), the calculation (82 * 23 * 60 / 6080) * 0.94 yields 17.5 knots, accounting for the loss of efficiency in the water column.