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

Question 1 of 31048fy_heal_CREATE_q134_2017

The propeller on a vessel has a diameter of 25.3 feet and a pitch of 23.2 feet. What would be the apparent slip if the vessel cruised 515 miles in a 23 hour day (observed distance) at an average RPM of 93?

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Question 1 of 31048

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🔍 Key Concepts

• Propeller pitch as the theoretical distance advanced in one revolution • Relationship between RPM, pitch, and theoretical distance run in a given time • Formula for apparent slip (%) using observed and theoretical distances

💭 Think About

• How far theoretically should the vessel move ahead in 23 hours if the propeller turns 93 RPM the whole time? • Once you have the theoretical distance, how does the observed distance (515 miles) compare to it: is it more or less? • Based on whether the observed distance is greater or less than theoretical, should the slip be a positive or negative percentage?

✅ Before You Answer

• Convert miles to feet correctly so observed and theoretical distances use the same units • Use the correct formula for slip: (Theoretical − Observed) / Theoretical × 100 (check the sign) • Be sure you use the pitch, not the diameter, when finding theoretical distance per revolution