Today in class we had our first sucessful launch.  My partner and I didn't want our bottle to be lost over the cliff of Midkiff so we decided to only launch at 30 psi.  On our first attempt of pulling our string we failed but then continued pumping until our bottle finally shot up.  Our bottle stayed in the air for about 4 seconds.  I think that we need to add fins in order to keep the rocket going up in one direction rather than  tailing of to the side.  We also are going to need to add some sort of parachute and find a deployment method to reach or goal of 10 seconds.  We also need to add some sort of cone to the top to make the bottle more aro-dymanic.  We were thinking of putting a cone that would fall off when the bottle starts to decelerate, so that when the cone comes off it will pull the parachute which would cause it to activate.