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- Q126 - Navigation Problems: Near Coastal
290. If the speed necessary for reaching port at a designated time is 17.4 knots and the pitch of the propeller is 25.6 feet, how many revolutions per minute will the shaft have to turn, assuming a 3% positive slip?
The shaft must turn at approximately 71 RPM. Speed in feet per minute is divided by the propeller's effective advance, which accounts for 3% positive slip, to determine the required revolutions per minute.
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