Fourth Launch

The requirement for today, the third day of launches, was to have a rocket with a parachute and a flight time of at least three seconds. We changed the design of the rocket by taping the top half of a Coke bottle to it. For the parachute, we attached a plastic bag to the Coke bottle half.  For the first launch, only 400 milliliters of water and 40 psi were added. When the rocket was launched for the first time, its flight time was only two seconds. We realized that the rocket probably needed more force to go upwards, so we used 500 milliliters for the next launch. This video depicts our second launch, which lasted for the minimum time. For our next launch, we are going to change how the parachute is deployed. The following link explains how a parachute is supposed to work for a water rocket.

http://www.rocklin.k12.ca.us/staff/pmorrison/ConPhys/Rockets/ParachutePreDesign.htm