What to Consider When Shopping for a Propeller
Several characteristics affect how a propeller will perform. Especially important are propeller diameter,
pitch , rake, and cup. Most propellers are identified by their diameter and pitch. Look for a number like 143/4 X 21. The first number is the diameter, the second is the pitch. In addition, it is important to understand the effects of ventilation, cavitation, materials, and other application variables on propeller performance. 

propeller figure
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