Planing Hull
Boats with true planing hulls can attain
SL ratios
over 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.
This is a information page for boat calculator: