Stepped hull

[Taylorman]

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.

[sigepmock]

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. :D
Here's a few good articles I found about tunnel design and stepped hulls:
http://boatdesign.net/articles/tunnel-hull-design/index.htm
http://www.lesliefield.com/other_history/speed_boat_developments_from_the_past_into_the_fut ure.htm
Chris

[ULTRA26 # 1]

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.
I believe that the hull getting higher in the back coupled with a high X demension causes more lift, thus a drier botom and less drag.
Just my .02. Nothing I would take to the bank

[Havasu_Dreamin]

The step helps to aerate the hull which means there is less wetted surface which means less drag which means more efficiency which means greater speeds.