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Sep 25, 2015 at 22:21 comment added SF. Considering the number of variables unaccounted for in measurement of exhaust speed - imperfect flow, condensation, many more - the most accurate practical formula would be $ I_{sp} = {\Delta v \over g_0}{ m_1 \over m_0} $ derived from Tsiolkovsky Equation. These values can be accurately measured and there are no hidden variables, simplifications or other dependencies in this equation.
Apr 28, 2015 at 21:25 vote accept ecfedele
Apr 27, 2015 at 15:08 answer added tckosvic timeline score: 4
Apr 27, 2015 at 1:34 history edited Mahendra Gunawardena CC BY-SA 3.0
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Apr 27, 2015 at 1:18 history edited ecfedele CC BY-SA 3.0
added 3 characters in body
Apr 26, 2015 at 23:39 history asked ecfedele CC BY-SA 3.0