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A few years ago when I owned a trimaran and was a member of "the Amatuer Yacht Building/Designing Group, one of their members claimed that by putting an half a wing at the top part of each side of the rudder (outboard rudder) just under water that it would kinda fool the boat into thinking it was longer and subsequently you would go faster. I tried it and I swear it worked. I think. My current boats rudder protrudes from the water under the counter. I could do the same thing and add a couple of feet to the water line length of my boat and the concurrent increase in speed. Anyone tried this or have any opinions. I don't think I ever heard (or at least understood) the physics behind why longer waterline boats go faster.
Roger
SV Yonder
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