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2 and 4 Bladed Propellers.
Two and Four blade propellers (and indeed propellers with greater number of blades) are not as common as 3 blade propellers, and both represent an attempt to improve one aspect of propeller performance, albeit at the sacrifice of a different aspect of performance. For example, the sailing boat may fit 2 blade to reduce drag under sail, but will lose some thrust under power.
From our example vessel with the 14 x 7 inch 3 blade 33% DAR prop we can look at 2 and 4 blade alternatives.
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