360. The propeller on a vessel has a diameter of 21.5 feet and a pitch of 24.5 feet. What would be the apparent slip if the vessel cruised 458 miles in a 23 hour day (observed distance) at an average RPM of 78?

Calculate theoretical distance using revolutions and pitch, compare it to the observed nautical distance, and determine slip as a percentage; a negative slip indicates the vessel traveled farther than predicted by the pitch, resulting in a slip of -5.6%.