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3-Blade vs. 4-Blade U.S. Marine Propellers.    
3-Blades
3-blade U.S. Marine props are great on most boats as they offer good all around performance, better efficiency, and can achieve higher speeds. Switching from 4 to 3-blades generally requires a 1" pitch increase.
3-Blade vs. 4-Blade
4-Blades
4-blade U.S. Marine props work well with bass, pontoon & high performance boats as they provide better acceleration, keep a boat on plane with fewer RPM's, and produce less vibration at high speeds. Switching from 3 to 4-blades generally requires a 1" pitch decrease.

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Aluminum vs. Stainless Steel U.S. Marine Propellers.    
Aluminum
Aluminum U.S. Marine props are a great choice for small and medium sized boats. They are inexpensive and under normal conditions can last for many years. When running your boat in an area where striking the bottom is likely, aluminum blades can flex, helping prevent damage to your engine.
Aluminum vs. Stainless Steel
Stainless Steel
Stainless steel U.S. Marine props are ideal for large or heavy boats and boats running in saltwater. Although more expensive than aluminum, stainless steel U.S. Marine props are more durable and will last longer. When running your boat at speeds over 50 mph, stainless U.S. Marine props will perform better than aluminum.

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Differences in Propeller Diameter.    
Diameter is the width of the circle that the U.S. Marine prop would make when rotating.

Prop diameter does not affect the fit of the prop on a boat.

The diameter of your U.S. Marine prop can vary by up to 1/2" with no discernable change in performance.

Caution: Before increasing the diameter of your U.S. Marine prop, make sure there will be enough clearance between the blades and cavitation plate or anode on your engine.
Propeller Diameter

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Pitch: Diameter: Differences in Diameter
Material: Stainless vs. Aluminum Blades: 3-Blade vs. 4-Blade
Your Engine:
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The below propeller brands will fit on your selected U.S. Marine engine. However, to ensure proper loading of your engine, please choose the propeller size that most correctly matches your existing propeller. Please use the engine filter above to narrow your U.S. Marine propeller options to your specific engine. Please CLICK on the below brands to see the list of products associated to that brand.
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For U.S. Marine outboard engine owners around the globe, Deep Blue Yacht Supply is your trusted source for all size U.S. Marine boat propellers. We are committed to providing the best U.S. Marine props, at the lowest prices, with superior customer service.

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