the speed a nonplaining hull can move through the water is a funtion of lenth. the bow and stern wake form a wave train the longer the distance beteen the peaks the faster the train can move. as you approach the maximum speed for the lenth of the boat the power requirements curves up sharply. by backing off slightly from max hullspeed power requirements drops sharply. Back off even more and power required vs speed is prety liner. This is independent of hull width as a wider hull will need more power for every speed compaired to a slim hull.
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