Description

Diameter
This is the total width of the "circle" at the blade tips as the propeller spins. Proper diameter for each propeller model is determined by the propeller's design and intended application.
Pitch
Pitch is the distance a propeller would travel in one full revolution, as if traveling through a solid. Each inch of pitch is equal to approximately **0 RPM, plus or minus *0 RPM. The right propeller will allow your engine, under a normal to heavy load, to reach the upper portion of the WOT range specified by its manufacturer without exceeding it.

A lower pitch will have greater acceleration and "pushing power" but a lower top speed.
A higher pitch will provide less acceleration, but a greater potential for higher top speeds.
Within a particular propeller series, as the diameter increases, the pitch generally decreases.
Rake
Rake is the angle of the blades in relation to the propeller's barrel, or center, and is expressed in degrees.

A high-rake propeller is best suited for high engine-mount applications. It reduces ventilation and increases bow lift. However, too much rake can negatively impact handling and performance by straining the engine, which will decrease hole shot.
A low-rake propeller causes less strain on the engine, resulting in a potentially better hole shot and higher wide open throttle (WOT) operating RPM.

Size
Propeller size is characteristically expressed as its diameter and pitch, in inches. The diameter is the first number. Pitch is the second. So a *4" x *7" prop would measure *4" in diameter with *7" of pitch. This same propeller may be expressed as *4" x *7"x 3, which would indicate a three-blade design.