Flattie vs "V" bottom Question

Hi, all. I have been reading Chapelle's American Small Sailing Craft
and paying special attention to his writings on Sharpies. Is there
anyone who can tell me the difference a flat bottom sharpie hull
makes in comparison to the V bottomed modified or "nonpareil" sharpie
hull. I know Bolger has a thing or two to say about flow along a flat
bottom boat. If you could include that in your discussion, I would be
grateful.

Dennis Marshall
Jes'tryne t' git edicated