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- Q141 - Navigation Problems: Near Coastal
200. If the speed necessary for reaching port at a designated time is 19.2 knots and the pitch of the propeller is 22.7 feet, how many revolutions per minute will the shaft have to turn, assuming a 4% positive slip?
The shaft must turn at approximately 89 RPM. This is calculated by converting the speed from knots to feet per minute, then dividing by the effective advance per revolution, which accounts for the 4% positive slip.
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