Science Buskers Water Rocket Car

As i will be participating in the Science Buskers busking round from 10 to 12 September 2010, I have thought for quite a while before deciding to build my own water rocket car from Lego to demonstrate the power of water rocket.

It took me about 2 hours to build a full model of a dragster like Lego car and then a number of days to modify it to become the water rocket dragster car.

I did some initial testing pump in 80psi of air into the 500ml bottle, and the car ran really fast. I then add some water and pressurized to 40psi, it had a really fast acceleration. But when i tried 60psi with the same amount of water, the car flipped instantly when it was released.

I guess i need to modify the car further to make it more stable so that it can take more water and pressure. As suggested by some experts, I adjust the length of the wheel axle to be broader for the front and rear wheel and added a pair of fins to provide the downforce; finally, managed to get the water rocket Lego car speed off at 60psi …..