You are turning 85 RPM, with a propeller...

You are turning 85 RPM, with a propeller...

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Question 1 of 2066636eea28f7522a1c51b6f9

You are turning 85 RPM, with a propeller pitch of 19 feet, and an estimated slip of +3%. What is the speed of advance?

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66636eea28f7522a1c51b6f9

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You are turning 85 RPM, with a propeller pitch of 19 feet, and an estimated slip of +3%. What is the speed of advance?

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🔍 Key Concepts

• Relationship between RPM, pitch, and theoretical speed (no slip) • How to convert feet per minute to knots • Effect of positive slip percentage on speed of advance

💭 Think About

• First, find how many feet the propeller would advance in one minute at 85 RPM with a 19-foot pitch, assuming no slip. What simple multiplication gets you that? • Next, convert that theoretical feet-per-minute speed into knots. What conversion factor links feet per minute to knots? • Finally, apply the +3% slip to reduce your theoretical speed. How do you adjust a value when you know the percentage loss?

✅ Before You Answer

• Be sure you treat +3% slip as a reduction in speed, not an increase • Confirm your unit conversions: minutes to hours and feet to nautical miles • After adjusting for slip, check which option is closest to your calculated knots

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