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- Q141 - Navigation Problems: Near Coastal
198. If the speed necessary for reaching port at a designated time is 18.5 knots and the pitch of the propeller is 21.7 feet, how many revolutions per minute will the shaft have to turn, assuming a 4% negative slip?
The shaft requires 83 RPM to achieve the necessary speed, as negative slip increases the propeller's effective advance beyond its pitch.
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