If the speed necessary for reaching port at...

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Question 1 of 2066636eea28f7522a1c51b5b2

If the speed necessary for reaching port at a designated time is 16.8 knots and the pitch of the propeller is 22.3 feet, how many revolutions per minute will the shaft have to turn, assuming a 4% negative slip?

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🔍 Key Concepts

• Propeller pitch as theoretical advance per revolution • Relationship between speed in knots and feet per minute • Effect of negative slip on effective advance per revolution

💭 Think About

• First convert the vessel’s speed from knots to feet per minute so pitch and speed are in the same units. What conversion factor will you use? • If the propeller would advance its full pitch every revolution with zero slip, how many RPM would be needed to get the speed you just calculated? • With 4% negative slip, does the propeller advance more or less than the pitch each revolution, and how does that change the RPM compared to the zero‑slip value?

✅ Before You Answer

• Make sure speed is converted correctly: knots → nautical miles per hour → feet per hour → feet per minute • Apply slip correctly: for negative slip, effective advance per revolution is greater than the geometric pitch • After you compute RPM, compare it to the answer choices and check if the result is reasonable given the small (4%) slip

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