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- Q142 - Navigation Problems: Oceans
454. You are turning 68 RPM, with a propeller pitch of 18 feet, and an estimated slip of +2%. What is the speed of advance?
The speed of advance is calculated by first determining the theoretical speed based on RPM and pitch, then reducing this value by the slip percentage. Applying a 2% slip to the theoretical speed of 12.1 knots results in an advance speed of approximately 11.8 knots.
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