Question 91Navigation Problems

70% to pass

You are turning 105 RPM, with a propeller pitch of 17 feet, and an estimated slip of -1%. What is the speed of advance?

A 17.8 knots
B 15.3 knots
C 16.9 knots
D 17.4 knots
AI Explanation

The correct answer is A) 17.8 knots. To calculate the speed of advance, we can use the formula: Speed of Advance = RPM x Propeller Pitch x (1 - Slip/100). Given the information provided - 105 RPM, 17 feet propeller pitch, and -1% slip - plugging these values into the formula gives us a speed of advance of 17.8 knots. The other options are incorrect because they do not accurately reflect the calculated speed of advance based on the provided parameters. The formula-based calculation clearly shows that the correct answer is 17.8 knots.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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