during the last week of science when have been making wind racer during the first day of making the wind races, we had to make a plan and make a start on the sail the second day we added supports to the sail and make it thicker to hold the wind and to stop it from breaking when the wind hits it. when we tested the wind race it moved but not as much as I would like, at the end of the experiment out car moved half a meter.if i was to do this next time i would change the size off the sail.