You are turning 82 RPM, with a propeller...

Question 1 / 2066636eea28f7522a1c51b6f7

Question 1 of 2066636eea28f7522a1c51b6f7

You are turning 82 RPM, with a propeller pitch of 23 feet, and an estimated slip of +6%. What is the speed of advance?

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Question 1 of 20

66636eea28f7522a1c51b6f7

You are turning 82 RPM, with a propeller pitch of 23 feet, and an estimated slip of +6%. What is the speed of advance?

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🔍 Key Concepts

• Speed of advance (SoA) vs. speed through the water • Relationship between RPM, propeller pitch, and theoretical speed • How propeller slip percentage changes the theoretical speed

💭 Think About

• First, calculate the theoretical speed in feet per minute if there were no slip. How do RPM and pitch combine to give you distance per minute? • Convert that distance per minute into knots. What conversion factor do you use between feet per minute and knots? • Apply the +6% slip to your theoretical speed. Does a positive slip value make the actual speed higher or lower than the theoretical speed?

✅ Before You Answer

• Be sure you convert minutes to hours correctly when going from RPM to speed in knots • Use the correct conversion: 1 nautical mile = 6076 feet (approx.) and 1 knot = 1 nautical mile per hour • Double‑check whether you should multiply by (1 − slip) or (1 + slip) when slip is given as +6%

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Question 1 of 20

You are turning 82 RPM, with a propeller pitch of 23 feet, and an estimated slip of +6%. What is the speed of advance?

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