Sailors choose the 3-blade Flex-O-Fold because, under power, it is the most efficient 3-blade prop available. Yet, it folds into a very low-drag configuration. Generally speaking, when compared to a 2-blade, the 3-blade will give you better performance when powering against a head sea and while maneuvering in both forward and reverse. In addition, if there is something out of alignment or out of balance in the drive train that can cause vibration, the 3-blade will run a little smoother.
A zink anode and its mounting plate, cover the blade gears preventing barnacles or other "creatures" from becoming a problem.
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