Then select a desired combustion chamber pressure and the exit cone pressure (usually sea level pressure) and hit the calculate button. Simply select the chemicals you want in your propellant and the amount of each chemical. Simply input the propellant ingredients and CHEM calculates the combustion temperature, propellant density, C-star, specific impulse and a lot more.ĬHEM is very simple to use. It calculates the performance of virtually any solid, liquid or hybrid propellant combination. Those days are over with the software program, CHEM. Even if they found one, they could never be sure of the performance. In the old days, the amateur had to experiment with different chemicals to see what may be a good propellant.
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