513. The propeller on a vessel has a diameter of 24.6 feet and a pitch of 26.1 feet. What would be the apparent slip if the vessel cruised 462 miles in a 24 hour day (observed distance) at an average RPM of 72?

The apparent slip is calculated by comparing the theoretical distance based on propeller pitch and revolutions to the observed distance. In this case, the observed distance (462 nautical miles) exceeds the theoretical distance (445.4 nautical miles), resulting in a negative slip of -3.8%.