What is propeller pitch?

Pitch is the distance a propeller would move in one revolution if it was moving through a semi-solid material, such as gelatin. A propeller's pitch is referenced by the second number in the size description (e.g., 14.5' x 28' references a 28' pitch propeller). If this propeller were 100% efficient (i.e., no slip), it would move forward 28 inches in one revolution.

updated: 4/1/2008