The propeller on a vessel has a diameter of 22.8 feet and a pitch of 19.3 feet. What would be the apparent slip if the vessel cruised 287 miles in a 24 hour day (observed distance) at an average RPM of 67?

Correct Answer: Option D — +6.3%

Engine distance: (67 * 1440 * 19.3) / 6076.1 = 306.4 miles. Slip: (306.4 - 287) / 306.4 = 0.0633, or +6.3%. This calculation confirms the vessel is experiencing positive slip, meaning the actual distance traveled is less than the theoretical distance the propeller would cover in a solid medium.