I finally finished my scratch airboat enough that I could take it out and do some test runs on the design. This is not your ordinary airboat, it is a twin engine design spinning 11x7 props with a total of .80ci of displacement. The hull is foam that has been covered in 4oz cloth and reinforced in areas with 6oz. The design of the hull is almost tunnel hull like with a channel running down the middle. Hull lenght is 36inches width is 14 inches. This lead for a very tippy model that had generous amounts of steering power from two large air rudders. This boat tracks very well at speed and holds extremely well in corners. It held so well that in one corner I rolled the boat. Quick grab the inflatable!!!! Below is a pic of my boat after she rolled over, and of my servos drying out.