This is Kymani Roach in one of the losing groups of 2nd period. Our group really put our minds together to find the best way to make the vehicle ride up the string but we couldn't.  However, there were some difficulties and disadvantages,because of the type of air and friction of the balloon. With the same amount of air pushing against the same amount of air, the balloon only got smaller, but if the air was helium everyone would've had more leverage. We feel that this experience will make us think harder about what we make next time.