I dont fully understand what the purpose of stepping the bottom of a hull serves? I assume it has to do with freeing up the hull but i dont grasp the conept of the hull getting higher toward the back of the boat.
Wow that's a good question...maybe post it in the Cats and Tunnels section and see what the guru's and knuckleheads say.
Here's a few good articles I found about tunnel design and stepped hulls:
http://boatdesign.net/articles/tunne...sign/index.htm
http://www.lesliefield.com/other_his...t_into_the_fut ure.htm
Chris