[Rorando]

Yeah a classic keel is not needed for bigger vessels as long as GM is low enough. One big difference between sail ships and modern ones is the increased air draft which effects the lift to drag ratio. Looking at your answers so far, I assume you've considered this already.

[jmoorebeek]

Yes, I can't say that we have absolutely everything figured out so far, but we have a decently complete model. Windage, changes to draught, and GM are already factored into our models at the root level, and while we may need to still tweak things we aren't waiting to be surprised by their effects.