Materials: milk bottles, slim wood blocks, solar panels, hot glue, duct tape.
Our boat had a bottom fin, a cut in half milk carton and some slim, lightweight wood. We had half milk cartons so that it wasn’t so elevated above the water, our theory was that if it had more elevation the rudder would not be in the water. We had a bottom fin for slicing through the water for speed. We had the slim wood for a platform on the milk bottles for the solar panel to sit on. the wood wasn’t too heavy but not too light so that the boat wasn’t pushed by wind.