Simplified stability estimationfor powerboats

Working on method to estimate powerboats initial stability.
I propose diagram to estimate lever of form to chine beam ratio (Lf/Bc) depending on:
- chine beam to hull draft ratio (Bc/T)
- deadrise angle 0,5,10,15,20,25
- heel angles 5, 10, 20 deg.

These graphs are intended for planning powerboats.
Lf/Bc=f(Bc/T, deadrise, heel)

Lever of stability You can calculate like this:

L=(Lf/Bc)*Bc-Zg*sin(heel)

L - lever of stability, m (=GZ)
Lf - lever of form, m
Bc - chine width, m
T - hull draft, m
Zg - vertical center of gravity from baseline, m (=KG)

Please, test on Your designs and make comments.

 

Test and advice...

Paper on stability estimation is almost ready. Please, advice in content and correct English. This papaer is supposed to be for conference, but method aimed at practical use.