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Why do large ships, submarines and other propellers have odd or even blades of 7 or 9?

Why do large ships, submarines and other propellers have odd or even blades of 7 or 9?The rudder of modern submarine, whether cross rudder or X rudder, is in front of the propeller and is centrally symmetrical. This means that: 1) the rudder will disturb the flow field in front of the propeller, res

2017-11-24