If the speed necessary for reaching port at...

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Question 1 of 2066636eea28f7522a1c51b5ba

If the speed necessary for reaching port at a designated time is 19.2 knots and the pitch of the propeller is 22.7 feet, how many revolutions per minute will the shaft have to turn, assuming a 4% positive slip?

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🔍 Key Concepts

• Propeller slip (difference between theoretical and actual advance) • Relationship between speed in knots, pitch in feet, and RPM • How to convert knots to feet per minute

💭 Think About

• First, figure out how many feet per minute the vessel must travel at 19.2 knots. What conversion factor do you need? • Next, determine the effective advance per revolution when there is a 4% positive slip. How does slip change the theoretical pitch? • Once you know feet per minute required and feet advanced per revolution, how can you combine them to find revolutions per minute?

✅ Before You Answer

• Convert 19.2 knots to feet per minute using the correct factor: 1 knot = 6076 feet per hour • Use (1 ± slip) correctly: think about whether positive slip makes the effective advance greater or smaller than the geometric pitch • Before choosing an answer, estimate whether the RPM seems reasonable for a ship’s propeller at about 19 knots (order of magnitude check)

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