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- Q141 - Navigation Problems: Near Coastal
229. You are turning 78 RPM, with a propeller pitch of 21 feet, and an estimated slip of -7%. What is the speed of advance?
The speed of advance is calculated by first determining the theoretical advance (RPM multiplied by pitch), then adjusting for slip, and finally converting from feet per minute to knots. With a propeller pitch of 21 feet, 78 RPM, and a slip of -7%, the speed of advance is 17.3 knots.
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