To make my boat float I use somthing called boyancy and stability. Buoyancy is the weight of water displaced by an object. By making the boat boyant, it will help it float. To make the boat boyant, the boat must be lighter than water. Stability is the fact that an object stays stable or in control. I make a stable boat by adding two pontoons on each side to "catch" the boat from falling over. By using a triangular hull, the chance of the boat just rolling over is decreased. I also distribute the weight on both sides, the "captians deck" in the back and the "water breaker" in the front. These aren't just for looks but for a even weight on my boat. To make the boat buoyant it must be light, so by hallowing out my triangular hull and pontoons, this will make boat lighter and more buoyant.