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- Q127 - Navigation Problems: Oceans
382. If the speed necessary for reaching port at a designated time is 21.6 knots and the pitch of the propeller is 22.5 feet, how many revolutions per minute will the shaft have to turn, assuming a 2% positive slip?
Calculate revolutions per minute by converting speed to feet per minute, adjusting for positive slip by reducing the propeller pitch, and then dividing the speed by the effective pitch, resulting in approximately 99 RPM.
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