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Two boat propellers can have the same diameter, the same pitch, and even the same number of blades, yet perform noticeably differently on the same boat. That's because boat propeller performance depends on much more than the numbers stamped on the hub. Rake, cup, blade area, blade shape, barrel design, and other details influence how effectively a propeller grabs the water and transfers engine power into acceleration, lift, speed, and handling. If you're still learning the basics of propeller pi …