As we begin researching different water bottle designs, I came upon this website. (http://lanceorloff.s5.com/rocket.html) The design of this water bottle rocket is very simple. However, there is useful information that we can all benefit from. This design tells us that fins are required for stable take off. Fins help the bottle rocket to spin in a straight line. Also, the website shares with us that there should be a counterweight in the front part of the rocket. This will also help keep the rocket balanced as it takes off. What the website doesn't have any information about, is the parachute. So we will have to come up with our own design about it.
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