an arrangement for determining the combustion duration from an energy conversion which is calculated using {HEAD ~ a polytropic equation} of {TAIL ~ state} 
an arrangement for determining the combustion duration from an energy conversion which is calculated using { HEAD ~ a polytropic equation } of { TAIL ~ state }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL