If the speed necessary for reaching port at...

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Question 1 of 2066636eea28f7522a1c51b5bf

If the speed necessary for reaching port at a designated time is 23.7 knots and the pitch of the propeller is 20.8 feet, how many revolutions per minute will the shaft have to turn, assuming a 7% negative slip?

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🔍 Key Concepts

• Relationship between speed, pitch, and RPM for a propeller with slip • How to convert knots to feet per minute • Meaning of negative slip and how it changes the effective advance per revolution

💭 Think About

• First, convert the required ship speed in knots to feet per minute so it matches the pitch units. What is the conversion from knots to feet per minute? • If there were 0% slip, how many feet forward would one revolution of the propeller move the vessel, and how would you find the RPM from that? • With 7% negative slip, is the vessel moving more or less than the theoretical pitch per revolution? How does that change the RPM you calculate from the no-slip case?

✅ Before You Answer

• Be sure to use 1 knot = 6076 feet per hour (or 6080 ft/hr depending on your exam convention) and then convert to feet per minute • Apply the slip correction in the correct direction: for negative slip, the actual advance per revolution is greater than the pitch value • After computing RPM, compare with the choices and check if the result is reasonable (on the order of 100 RPM, not tens or thousands)

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