ORIGINAL: Model_Mann
what is a stepped hull, are there any advantages of having the hull designed like this
Look at the 3rd and 4th pic of his post.
Towards the bow (front) of the hull, on the bottom.
There is a 'step' in the hull bottom when you look at it from the side. The bow portion of the hull bottom sits lower into the water than the rest of the hull bottom. Flip it upside down and it looks like a 'step'.
When traveling over the water, this bow portion raises the front of the hull slightly to introduce air under the rest of the hull bottom. Doing so lets most of the hull ride on an air cushion, with no friction, as compared to a wetted surface. If you ever hear someone say the hull 'airs out', it is in essence riding a cushion of air.
In theory, and practice...