RockSim A altitude prediction program from Apogee Components. Considered one of the easiest to use, and yet one of the most advanced rocketry programs available.
http://www9.50megs.com/rocketguy101/ Centuri "TIR-100" Altitude prediction charts. File size is pretty huge, but it will give you some idea of what programs like RockSim accomplish.
(high school level)
How to Track Your Rocket's Altitude? Click Here
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