Our group made a boat out of 2 styrofoam cups, a 4 by 4 piece of styrofoam and a straw to help the boat stay straight. We put the 2 styrofoam cups (so the opening is the back) so that the air could go in the opening and push the boat forward. Our boat did float during the trial but at the end the boat slowed down because it could not catch enough air. We will add another straw at the back of the boat. I hope next time the boat goes a little faster at the end.