> Consistancy is not correctness.

No, but it's a nice start.

> A boat with an upturned bow but same volume rises slower than
> a boat without an upturned bow. A bow that is buried is a hazard only
> if the tip of the bow can dig into the bottom flipping the boat. An
> upturned bow prevents this by keeping a curved keel line facing the
> bottom longer.

My interest in the upturned bow is more to stop it from submersing in the first place. At planning speeds, while surfing, burying the bow would have rather drastic effects (you mentioned building your boat to do endo's in surf, I'd rather avoid an unexpected endo!)

Mark