Propeller Pitch Speed Calculator

Formula

To calculate the propeller pitch speed:

\[ S = \frac{P \times R}{G} \]

Where:

\( S \) is the propeller pitch speed
\( P \) is the propeller pitch
\( R \) is the engine RPM
\( G \) is the gear ratio

What is Propeller Pitch Speed?

Propeller pitch speed is the theoretical distance a boat would travel in one revolution of the propeller, assuming no slippage. It is a crucial factor in determining the performance and efficiency of a boat’s propulsion system. The propeller pitch is the distance the propeller would move in one revolution if it were moving through a soft solid, like a screw through wood. The engine RPM (revolutions per minute) and gear ratio also play significant roles in determining the actual speed of the boat.

Example Calculation

Let's assume the following values:

Propeller Pitch \( P \) = 20
Engine RPM \( R \) = 3000
Gear Ratio \( G \) = 2

Step 1: Multiply the propeller pitch by the engine RPM:

\[ 20 \times 3000 = 60000 \]

Step 2: Divide by the gear ratio:

\[ \frac{60000}{2} = 30000 \text{ units} \]