The directions for the balloon car may not have clear directions here is a link from Paulius to help you.
https://www.howcast.com/videos/425708-How-to-Make-a-BalloonPowered-Car
The directions for the balloon car may not have clear directions here is a link from Paulius to help you.
https://www.howcast.com/videos/425708-How-to-Make-a-BalloonPowered-Car