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Re: Robotic Rocket
If it's the contest I'm thinking of, additional electronics are not allowed for the ejection charge. You may want to get a copy of a program called Roc Sim. It's a combination of a cad program and a simulation program. With it you should be able to design a rocket-engine combo that gets very close to the altitude by design. One parachute for model rockets is more reliable than more. If you can use additional electronics then a pic sampling a pressure sensor like a Freescale MPX4115 is the way to go. 10 bit sampling would be best. As for the time it takes the rocket to come down under chute, there are some web sites with descent rate calculators.
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