Join Date: Dec 2001
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three blade prop
I''ve read that the weight/HP ratio for a displacement boat is about 500 pounds/HP.
There are advantages and disadvantages to a three blade prop vs. a two blade prop. The advantages are most apparent when backing down and during initial forward thrust. Some say (and claim) a three blade tends to exhibit less (or minimal) prop walk. The disadvantage is that no matter where the engine is stopped, at least two blades are in the direct stream of water flow. With a two blade prop, it is possible to get the blades to be in line with the rudder, thus providing minimal additional resistance to water flow. However, if this is a major concern, you should consider installing a folding prop.
Whatever you do, make sure the prop you install will fit in the space provided with sufficient clearance from the hull, and the rudder. Also, do not exceed the recommended pitch for the engine''s HP and its optimum operating RPM.