Boats with true planing hulls can attain SL ratiosover 2.9 or 3.0. True planing hulls require flat underbodies aft for planing
surface. These hulls run must be shaped such that the quarter beam buttock angle
is less than 2 degrees which allows for the hull to climb it’s bow wave and
rid on the water as opposed to through the water with a displacement hull. The weight
of the vessel to its length is also a critical factor in what speed it can attain.