Tunnel hull, Inflatable floor has I beams in it very rigid that does not flex and introduce air under hull, have tried all sorts of inflatable boats with a jet outboard with dismal results, this is the first to really impress me.
Tunnels water to the jet intake like a hard bottom jet boat, and it bottom has a hi tech poly that just slides over rocks .
Have ran it in under 3" of water on step, with a load. The transom sits on top of floor, on most Zodiak style boats the transom is at the bottom of the boat and you hit at front of transom.
