you must be up early in maui!!
dont be sorry, i am sure you get alot of wierd questions.
Its just an interesting design, a few of the local boardheads are always looking at this stuff and wondering what the idea is behind them.
Years ago some boards (if i remember correctly : fanatics) had this except the flat was a concave , and supposed to create more lift, but unless a concave is orientated straight down in the water i cant see how that worked .