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Factors influencing boat balance
Thanks for your post. Nice clear explanation of jacking, by the way. Note again my use of the phrase "Everything else being equal." In real life, everything else *isn''t* equal: all the forces interact
to a degree that makes it sort of silly to try to tease them apart and consider them in isolation, but then again this is merely a thought experiment, right?
Remembering that the question at hand focused very narrowly on the question of how heel itself influences helm, I am excluding other factors (like distortion of the sailshape).
In my head I''m trying to separate the effects of heel into two components: what goes on above the waterline, and what goes on below it.
Above the waterline, it seems (again, reasoning intuitively without an expert''s knowledge) that heel just moves the whole sailplan to leeward, (and twists a couple of force vectors around in ways that are too complicated for me to think about.) Everything else being equal (!) this alone would create weather helm.
Now take away the rig and look below the water, and I get confused. I can see that for the circular hull cross section,("submarine"), heeling would have no effect on helm. (so the only effect would be the rig, and hence the net effect would be weather helm.)
But what about the flying saucer with a keel? My gut tells me that as it heels, there''s now more wetted surface on the low side of the centerline, and so the whole thing is going to try to steer towards the weighted side. But I really don''t know.
I have available the necessary experimental materials: one sunfish hull and one kid. If the pond weren''t frozen solid, I''d float the sunfish (sans rig), sit the kid on one rail, shove the whole thing forward and see which way it turned.