3 /2 /1 blast off

In my class we has been making rockets made out of two bottles with cardboard fins. We began with a 1.5 litre bottle.  We put the top of a another bottle on the top so it would be aerodynamic and the water will shot out of the bit that is a fill bottle. The fins are made out of cardboard and on the launchpad we had to click our rocket on. Then we pumped up the  air pressure and we launched.  For the first fly we put 60psi and 300ml and it went 14.3m and for the second one we put  60psi and 200ml and it went 9.7m. Next time we will have a parachute.