We had our classes rocket launch and we had a great time! My group was very proud to have a rocket to go this high. I think the water helped a lot. The more force the higher it is going to go. We added 250 ml of water and we put 95 psi air in the rocket. In this photo my MJ and I are ready for our rocket launch. Our rocket is 75 cm and more the half the size of me! It was really a pleasure getting to start my 5th grade off by launching bottle rockets.