In article , Robert Swinney says...

What I'd like to see is a comparison of the HP output of a steam engine
running on a given amount of input (boiler) pressure compared to the HP
output of the same engine running on the same amount of input compressed air
pressure.

To be fair I think you need to figure in some kind of flow rate
as well in this, ie 50 psi air at 10 cfm, vs 50 psi steam at
such and such a boiler water feed rate.

Jim


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