Here is my plan for a 40 size airboat - not for the novice airboat driver - she is a handfull, and WILL do backflips if you hold your trigger finger down too long. I call it Blue Thunder - cuz it's blue - and it has a Thunder Tiger motor on it. Finally after about 30 upside down retrievals - resulting in more than 5 broken rudders - I got a full tank thru her last night in one SWEET run !