The propeller on a vessel has a diameter of...

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Question 1 of 2066636eea28f7522a1c51b500

The propeller on a vessel has a diameter of 21.2 feet and a pitch of 20.0 feet. What would be the apparent slip if the vessel cruised 391 miles in a 24 hour day (observed distance) at an average RPM of 88?

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Question 1 of 20

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🔍 Key Concepts

• Propeller pitch vs. theoretical distance traveled in one revolution • Relationship between RPM, time, and total theoretical distance • Definition and sign convention of apparent slip (%)

💭 Think About

• First, find how many revolutions the propeller makes in 24 hours at the given RPM. What is that number? • Using the pitch, what is the theoretical distance the vessel should travel in 24 hours with zero slip? Convert it to miles to match the observed distance. • Compare the theoretical distance with the observed distance. Is the vessel moving more or less than the theoretical distance? What does that say about the sign (positive/negative) of apparent slip?

✅ Before You Answer

• Be sure to convert feet to miles correctly when comparing distances. • Use the correct formula for apparent slip: (Theoretical - Observed) / Theoretical × 100% or its signed equivalent. • Double-check whether the answer choices use positive for positive slip (less distance than theoretical) and negative for negative slip (more distance than theoretical).

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