Building catamaran rudders

Rudder alignment - multihulls4us, Now draw the rudders on there too, and make the rudders tangent to the circles. notice thatas your boat turns around the center of the circles, the inside hull's turing radius is 5", while the outer is 10". big difference. so if your rudders always stay parallel, there will be extra drag. if you use ackerman geometry, the drag will be less..

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images taken from various sources for illustration only Building catamaran rudders