Amber and I are partners for this project. I've volunteered to do the first post. I've looked through quite a bit of links online for how to build the most efficient bottle rocket. Our main goal is that it stay in the air for at least ten seconds. That being said, ten seconds is a REALLY-REALLY long time.
Therefore, we must calculate and design our rocket to be JUST RIGHT. The weight of each part of the rocket must be within certain restrictions in order to ensure that the rocket not be too heavy or too light. One website, http://www.ohio4h.org/sciencealive/rocketsaway.html says that the nose-cone section of the rocket should weight between 0.3 and 15 oz. The body weight should be between 0.8 and 15 oz, tail weight should also be between .8 and 15 oz (although lighter is recommended), and use up to 64 oz of water. It's common sense that the more mass of water you push in one direction, the more push is on your rocket. However, because we're limited to 2 liters of water, we must still leave room for pressure to build. The ideal amount of pressure is 1-140 psi.
The only difficulty is finding the correct combination of weight/water/ and air pressure in order to allow us to WIN the challenge :)
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