On Thurthday this week we started to test some 1.5 litre fizzy drink bottles on the rocket launcher. We got to choose the Variables (the PSI and the amount of water we had in the bottle) We used a bike pump and attached it to the launch frame. So far we found that 250mls of water and 50 psi with the fins was the best combination and it flew about 70 metres in length. (which was the best one)
