If the speed necessary for reaching port at...

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Question 1 of 2066636eea28f7522a1c51b5bb

If the speed necessary for reaching port at a designated time is 19.6 knots and the pitch of the propeller is 24.6 feet, how many revolutions per minute will the shaft have to turn, assuming a 5% positive slip?

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🔍 Key Concepts

• Relationship between speed, distance per revolution (pitch), and time • Converting knots (nautical miles per hour) into feet per minute • Effect of positive slip on the effective distance traveled per revolution

💭 Think About

• How can you convert 19.6 knots into feet per minute so it matches the feet-per-revolution pitch units? • If a propeller has a pitch of 24.6 feet, how many revolutions are needed to cover the distance traveled in one minute at the required speed, before considering slip? • With a 5% positive slip, does the propeller move the vessel the full 24.6 feet each revolution, or slightly less? How do you adjust pitch for that?

✅ Before You Answer

• Be sure to convert knots → nautical miles → feet → per minute correctly (1 nautical mile = 6080 feet is commonly used on exams). • Adjust the pitch for 5% positive slip by reducing the effective distance per revolution to 95% of geometric pitch. • After computing RPM, compare it logically with the answer choices: does your RPM seem reasonable for the given speed and pitch?

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