Originally Posted by capt vimes
... And lifts the bow on a reach to plan earlier...
And on a close haul the bow is less 'dipped in' by the broad stern... The waterlines in a heeled situation is less - how to say - offline... But more in line with the course the boat is going...
There are a lot of merrits to a fat bow, but the main reason is lift to plan...
I don't think that the reason that XVIII century sailing boat was a rounded bow has to do to planing or dipping the bow while heeled (those boats heeled not much). Regarding an open type modern racer you are correct but that has nothing to do with this case.
We have talked extensively here about the advantages of that kind of bow, referring what his designer, David Raison, found about that in his studies and while racing and what we could observe on the last Transat. Maybe I did not have understood correctly Classic 30 question. I thought he was talking about the boat he posted.
Classic30, for more information search on the thread search engine for David Raison and Bathtube bow.