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Props spin either clockwise (standard or right-hand rotation) or counter-clockwise (counter or left-hand rotation).
Most single engines use a standard rotation prop. Most twin engines use one of each.
To determine what prop rotation you have, look at your prop as if on a boat. Position a blade pointing straight up. If the right-hand side of the blade is closer to the boat than to you, it's a standard rotation prop.
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Props are often stamped with both dimensions and a part number. Look on the outer hub of the prop near the blades or inside the hub. Numbers similar to 15 x 17 are the prop dimensions (diameter & pitch). Those numbers are not your part number! Part numbers resemble 031018, 48-11320A40, 2231-103-12, etc. |
Look around the inner hub or on the blades.
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15 1/2x17 is not the propeller part number!
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Volvo Penta Aluminum QL Props - Blowout Prices!
Over 40% Off & Free Shipping on ALL QL brand props
Designed for all engines: J/E, Mercury, Yamaha, etc.
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Propeller Basics
How To Choose A Prop Diameter Pitch Cupping Rake Ventilation Cavitation We tell you everything you need to know about props from cupping to ventilation. |
Prop Characteristics
3 Blades VS. 4 Splines Left-Handed Props Performance Exhaust Aluminum vs. Stainless Steel If you want to modify your boat's performance, consider the above before making your selection. |
Determining RPM's
Effect of pitch on RPM Test for Maximum RPM For safety and efficient performance, it is critical that your engine operates within the RPM range recommended by the manufacturer. |