gtrsi - As for the friction caused by the recharge of the reg in the chamber, assuming I did my calculations properly anyway, the loss on the first shot is roughly .01K net. Over the course of a long string, the loss can be up to 5K net, but without really knowing how much air is used per firing cycle, all I can say is there is a definate cooling trend in the charge chamber which can be magnified or reduced by making the proportion of the gas used from the chamber per firing cycle smaller or larger respectively. It's basically about weighted averages, because a certain volume of gas (x) actually undergoes a fairly large loss of temprature which is absorbed through the rest of the chamber ((x/y)T+yT) then the same thing is repeated again but with heating when a new volume of gas (z) enters the chamber ((z/y)T+yT) and brings the chamber up to a new temp, the loss of pressure in the reg also - so on and so on.
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