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Hi there, I've done a number of weather balloon flights and I think I may be able to help a bit. Firstly the size of the balloon has more to do with how much payload it can lift than how high it goes. Determining balloon size is just a simple matter of displacement, helium lifts 1.0565 Kg/Cubic Meter. As far as the tether the max strength according to FAA regulations is 50lbs of force to break the line. You can read about my various ballooning exploits at tracksoar.com