Zedny

Thanks for the quick and informative replies. I didn't think of that...

Everyone is saying, that you should burn the least efficient fuel first, but it got me thinking. Is this thing really just as simple as that? How can you compare the Specific impulse of an LFO, a SRB, an Ion Engine and the RCS thrusters with their different fuel densities? Basically, which would give you more ÃŽâ€v? Slowly using up some denser (heavier) fuel therefore wasting energy on bringing it with you longer, or taking lighter fuel but burning through it faster? I know it is almost irrelevant in KSP, since each type has it's own specialised use, but I would still like to read your thoughts about the subject. Should this be investigated and if so, how could you put math behind it? It's not rocket science or anything and I don't want any complicated equations just some simple stuff to compare the values. My first idea was to divide ISP by Mass, but it just didn't seem scientifically accurate enough.