Propeller Characteristics - Rotation
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Standard & Counter Rotation Props
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. Rotation on Twin Engines
Two propellers spinning the same direction on twin engine boats will create steering torque. In other words, two right-hand (or standard rotation) propellers pull the stern hard to the right and the bow to the left. Two opposite-direction propellers on twin engines eliminate this steering torque because the left-hand (or counter rotation) propeller balances out the right-hand propeller. This results in better straight-Line tracking and helm control at high speed. |
Opposite-direction propellers on twin engines eliminate steering torque because the left-hand prop balances out the right-hand propeller.
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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. |