Bill
Planing surfaces are of course most efficient as very wide and very short, for much the same reasons wings are. But even power boats have longer and stepped "pads" for more versatility. Foils look a lot more attractive when you bring in the pounding. Also, I spoke to a guy in SA who has an about 30 foot beachcat (Whiplash)I remember him saying something about planing upwind, but bow burying preventing downwind planing. Back to the foils or my personal favorite, Racking hulls, which bring the buoyancy forward when sailing off the wind.