If the speed necessary for reaching port at...

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Question 1 of 2066636eea28f7522a1c51b5b8

If the speed necessary for reaching port at a designated time is 18.5 knots and the pitch of the propeller is 21.7 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 distance advanced per revolution • Converting speed in knots to feet per minute • Applying negative slip percentage to reduce theoretical advance

💭 Think About

• First, if the propeller advanced exactly its pitch every revolution (0% slip), how many RPM would be needed to cover the required feet per minute? • How do you convert 18.5 knots into feet per minute so it matches the propeller pitch units (feet/rev)? • Once you have the ideal RPM with 0% slip, how does a 4% negative slip change the effective distance advanced each revolution?

✅ Before You Answer

• Be sure to convert knots to feet per minute before using the pitch (in feet/rev) • Apply the 4% slip to the distance per revolution, not to the RPM directly • After finding RPM, compare with choices and check if the number is reasonable for a ship’s propeller (order of magnitude).

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