Originally Posted by kubcat
The number of blades and the shape of the blades changes, amongst other things, the stern lift.
Uh. Oh..... Prepare for heated discussions!
Back to the original question......
Fistly, Freyaflies, welcome to Ribnet!
To put this in "layman's" terms, chine walking is essentially when the boat lifts too far out the water & "falls over".
Picture the scene at rest. Whole hull (& probably your toobs) are in the water. Nice & stable. Start moving, you are in "displacement mode", pushing lots of water out the way & making big waves. The bow lifts mostly down to the force of the passing water against the shape of the hull. As you speed up, the whole hull is lifted out by the pressure of water on the bottom of the hull due to the movement and you get up on the plane, where you are essentially skimming over the top of the water instead of ploughing through it. The V shape of the hull has an upward force proportional to the speed through the water. So, the faster you go, the further out the hull comes.
Now imagine you have somehow managed to sit the boat on a bowling green and perfectly balance it on it's keel. you can imagine it won't take much for it to fall over. The faster you go, the more the hull lifts out, and the nearer to that bowling green scenario you get. Eventually gravity takes over (or a small wave unbalances it slightly) and it goes one way. Toob then hits the water & gets an instant lift that throws it the other way......
You know the rest!
As an aside, you don't get chine walking on flat bottomed things like Dorys 'coz once they're up they're up and sat on an essentially flat surface. This, as some of us know has some major dissadvantages too.... :smiley with missing teeth, sore @rse, rolling eyes & dazed stars around top of head: