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- Q127 - Navigation Problems: Oceans
320. You must average 16.25 knots to reach port at a designated time. Your propeller has a pitch of 21'08″, and you estimate 4% negative slip. How many revolutions per minute must you average to arrive on time?
The correct revolutions per minute is determined by dividing the desired speed in feet per minute by the propeller's effective advance per revolution, which accounts for negative slip.
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