JoeP wrote:Those are steppedal hulls. Introduction of air helps reduce drag. Each section of hull is angled up so it's forward end is above the trailing edge of the one before it. This makes for 3 separate planing spots at their lower, aft ends and the portion just aft of the step(s) is free of the water reducing drag. The boat runs on these portions of hull which makes the boat trim flatter an also helps eliminate some if nog most of the bow rise on acceleration. Everything is a tradeoff though. These boats can show some instability when going into a turn since they are balanced on 2 or 3 small planing areas. Also, the air under the boat can cause aeration/ventilation of the drive units if not managed properly by the design. As Semi said it is something of a black art to be able to balance the different aspects to come up with a really good working design. I think Michael Peters is one of the best at this.
Funny, I am in contact with Michael this evening about his ADELE manual which I am finding most helpful. Nice guy.