About Your Propeller

Diameter - This is the measurement from the center of the propeller shaft to the outer most point of the blade and multiplied by 2.

Pitch - This is the distance the propeller would travel in one revolution without any slip. There will always be a percentage of slip in the forward movement of the propeller. Pitch is measured in inches.

Constant Pitch - This pitch remains the same all the way across the face of the blade.

Progressive Pitch - This pitch is lower at the leading edge and increase progressively across the face of the blade.

Rake - This is the angle the blade is attached to the hub of the propeller. Not to be confused with pitch. Higher rake propeller blades will be angled towards the prop nut.

Cup - This is the sudden and sharp turn up of the blade at the trailing edge of the blade face. Cup enables the blade to grip or bite the water better. A cupped propeller will usually turn 200-400 rpms less than an uncupped propeller of the same size.

Aluminum Propellers vs. Stainless Steel Propellers

If you would like to know more about the differences in these two types of propellers, see what our experts say about Aluminum Propellers vs. Stainless Steel Propellers.