I already designed an rc model so i can make a real one. its 1:16 scale model made of foam and is about 6 inches long and it needs to hold up 12.5 punds to float a person and a 30 pound gas engine. i still have to make a bag for it. I got a real good design, its a platform with a box around it. its too hard to describe but you have to see it. ( []____[] )it looks like this if you would slice it. Around the box there are holes for the air to get out and the bag will attach to the top of the box. it will float if the engine shuts off cause the holes are high in the chassis. if the rc model works good and floats ill put some good radio gear and a good motor in it and keep it. I was thinking of gettin a thunder tiger 12 cause its 50$ at tower