gmui wrote:Our regional competition is tomorrow morning and I was wondering what the steps for competing are. Are we expected to fill the water bottles ourselves within the time allotted? Do we also mount the rocket on their launcher? Pull the trigger? I assume they will take care of all the timing...
Also, is it safe to assume that "Sparkling water" bottles are the same as carbonated? I.e. they will qualify for the competition?
gmui wrote:Also, is it safe to assume that "Sparkling water" bottles are the same as carbonated? I.e. they will qualify for the competition?
ls20817 wrote:I need help incalculating the center of pressure. I've looked on-line. It doesn't translate well to a cone shaped nose cone. Any advice?
SOCoach wrote:I am trying to help my kids prepare for bottle rocket in a few weeks - we have built and tested many rockets but our best time is right around 10 seconds.
We have used plastic flourecent light tubes for the nosecone . . approximately 3 feet . . 450 ml of water, 3 fins, 1 L bottle and the weight of the rocket ends up right around 120-130 grams. Our rockets tend to go fairly high, then fall backwards (straight down, the reverse of how they went up) for about half the height, then level out and backslide the rest of the way.
Are the teams that are getting 15+ seconds using paper nosecones? My kids are getting frustrated and I want to be able to help them but I am running out of ideas.
SOCoach wrote:Our team tested their rocket today. It weighed 119 grams, 105 cm long, we used 375 ml of water, 4 fins and I even had the kids determine the CLA, CG, and CP. According to their calculations there is about 20 cm between the CLA, CG, and CP (although the CP is nearly at the end of the bottle.)
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