SCRATCH THAT OUT !!!!

AND SO WE CHANGED OUR IDEA.. WELL, we're trying something different, because our car wasnt travelling in a straight line because of the balloon, it was because of the CAR ! the car's point at the top was not straight therefore making the car travel towards the left. AND SO, trying to fix that problem, we sketched a new car, using the same material. BUT if this car doesnt work we will stick to the other design and redue the whole car, making sure the measurements are correct and accurate

STOP... I HAVE AN IDEA !

We just decided to change our idea.. well a BIT, we discovered that our balloon car was a BIT TOO heavy, so... here are the changes :
1. took out one wheel, to make the ballon car have THREE wheels.
2. you know that red part you see in the picture of our recent ballooncar ? The one that is attaching the wheels to the car? We changed those knex parts to bbq sticks ! AND OBVIOUSLY it reduced the weight of the car by a lot :)

The Problem is ...

the problem is the freedom of the ballon; if the ballon starts moving the car tends to move in zigzags. To fix this problem ...
a ) insert the balloon in net and attach net onto car
b ) create a fence around ballon to prevent it from moving

We tried both, but havent decided on which one is better ... * still in discussion

concusion - we did not do any of the ideas, we just taped the balloon securely to the car.