Angus, you make me smile!
you may be very right, i am starting to feel that the footy model may end up being a narrow, slab-sided, relatively heavy displacement boat. your point about the drag going up as the wetted surface goes up is a very good one. so before i launch off into the last of my defenses of the “wide” boat i want to make it clear that i do agree with what you are saying, and that to an extent am playing devils advocate…:devil3: of course, to another extent:
i do think there still is something to the idea of a wide hull. you are right that the “wide” boat finds its roots in attempting to get more leverage for the ballast, be that human, or water. however, the need for that disappeared with the advent of the canting keel - all of the sudden you could have a very narrow boat, and still get the stability you needed, without any extra width. yet, designers stayed with wide boats. [i am thinking of the open 60’s, VOR boats, open “xyz’s”] i figure this to be because of the fact that as i have said, when you heel a wide boat out of the water, the wetted surface goes way down, almost to the point where the boat attains catameran sailing qualities. if you think about the pictures of the Vendee boats, they are often planing downwind, or over on their ear, on a reach, or more rarely, on their ear upwind. when they are in these latter two modes of sail much of the boat is out of the water - low wetted surface. much lower than say one of the new 40 foot canters, that are very narrow, which heeled over have much the same wetted surface as when upright. that said, as i noted in my last one of these things, this design philosiphy may not have a place in the majority of footydom, simply because there is not a lot of reaching done by these boats, and so, spec-ing a boat out to be a rocket ship across the wind may not be a “fast footy” however, in the few times when the boats go a distance on a reach, or have a triangle course, where it is a an upwind, reach, reach format, i think a wide boat would not be as penalized as perhaps we are thinking… of course, i have not had the chance to test this in real life…:rolleyes:
to quickly add something totally off topic about the 12s, is it just me, or should we drop the new AC boats, and go back to the 12s!? that i think would be the best thing that happened to the Americas Cup since being allowed to build boats out of aluminum/composites…!
anyhow, as is becomeing popular to say, “just my .02!”