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Now you should consider the material used in constructing the propeller. Propellers are typically made out of composite, aluminum or stainless steel. Composite propellers are preferred for good performance, durability and a low price. Aluminum propellers are the most common and have the widest range of applications. Stainless steel is the most expensive but give you the best in performance and durability.

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The main goal of choosing a proper boat propeller is to select one that allows the engine to achieve its optimal wide-open throttle. This is typically between 5000 and 5500 RPM for outboard motors and 4400 to 4800 for stern drives or depending on the type of engine you have. You can find the specific information through the owner's manual of your boat or engine.
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