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- Q141 - Navigation Problems: Near Coastal
170. The propeller on a vessel has a diameter of 19.9 feet and a pitch of 21.6 feet. What would be the apparent slip if the vessel cruised 395 miles in a 23 hour day (observed distance) at an average RPM of 78?
The apparent slip is -3.20% because the vessel traveled slightly farther than the theoretical distance calculated from the propeller's pitch and RPM, resulting in a negative slip value.
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