Launch Dos: New Discoveries

These 5 videos are 2 attempts just bottle with different amounts of fuel (water) in them and the next 3 are 3 attempts with modifications (fins and nose cone and just fins). For our first launch with no modifications we used 500 mL of water and the launch lasted 3.8 seconds. The 2nd launch we used 700 mLs of water and it lasted about 4.8 seconds. Our modifications included 3 fins made out of card stock and a nose cone. For the nose cone we just cut off the square part of a regular small orange cone. The first time we launched with modifications, we used 700 mL again and it lasted 3.7 seconds. Then we tried again with 800 mL and it lasted 3.1 seconds. We decided that the nose cone was too heavy and that it was making our rocket worse because the bottle would come down, nose down, faster than it would with no nose cone. So we took it off and just went with the fins and filled the rocket with 700 mL again. Without the cone it lasted about 4.8 seconds. For all the launches, we used 40 psi. From these launches, we have discovered that if we use a nose cone, we need a lighter one. We also need to use about 700 mL of water for the launches. Some changes we will make are to add another bottle to our bottle, create larger, more stable fins and make a lighter nose cone. We also need to create our parachute for the launch tomorrow.