Originally posted by zeitghost
I'd be interested to know how cheap it could potentially be to reach that height, excluding the cost of the electronic stuff. To get, say 200g (0.2Kg) to 30km ballistically would take a minimum of 0.2 Kg * 9. 8 m/s^2 * 30,000 m = 59 kJ. Or about 2 cc of petrol. How much energy would it take to create the required amount of helium to float up.
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