Therefore, a 12" x 9" propeller would have a 12-inch diameter and a 9-inch blade pitch. ![]() ![]() The diameter is referenced first and the pitch is second. When describing a propeller both the diameter and pitch are given. Pitch is the distance that a boat will travel if rotated one revolution without any slippage. Diameter is the distance measured across the propeller hub line from the outer edge of the circle that is made by the propeller's blades during rotation. ![]() Propellers have two basic dimensions diameter and pitch.
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