Fuel carbon is the number of carbon atoms in a fuel molecule. Carbon reacts with oxygen to produce carbon dioxide, releasing 393,509,000.0 joules per kilomole. Carbon atoms have a molecular weight of twelve and have four outer electrons, while hydrogen atoms have a molecular weight of one and one outer electron. Since carbon has a higher molecular weight than hydrogen, fuels that have a higher proportion of carbon will generally be denser than fuels which have a low proportion of carbon. Carbon has a molecular weight to oxidation ratio of three, while hydrogen has a molecular weight to oxidation ratio of one. Since carbon has a lower molecular weight to oxidation ratio than hydrogen, fuels that have a higher proportion of carbon will generally have a lower enthalpy change and therefore lower exhaust velocity than fuels which have a low proportion of carbon. Since carbon dioxide has a higher molecular weight than water, fuels that have a higher proportion of carbon will generally have a higher combustion temperature than fuels which have a high proportion of hydrogen. Fuel carbon is used to calculate fuel molecular, fuel oxidation and mixed carbon dioxide.

fuel molecular = 12 * fuel carbon + fuel hydrogen + 16 * fuel oxygen

fuel oxidation = 2 * fuel oxygen - 4 * fuel carbon - fuel hydrogen

mixed carbon dioxide = reacted fuel * fuel carbon
 
 

This is used in astropolis, bipropellant rocket, tripropellant rocket, pumped rocket and rocket cost.
 
 

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