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[quote]QUOTE: Originally posted by GP40-2 [quote]QUOTE: Originally posted by trainjunky29 True, but it's the pressure that causes the force on the piston, not the volume. The volume comes into play when trying to conserve steam--take away to much steam and the boiler pressure goes down. Sincerely, Daniel Parks [/quote] No, the cylinder has a difinite volume that needs to be filled. If you limit the volume of steam entering the piston, regardless of the pressure, you limit the power. As the high pressue steam enters the cylinder, it expands and transfers its energy to the cylinder. Once a volume of steam is done expanding, no more power transfer. That's why the Allegheny was so powerful with just 260 lbs pressure. It was not the pressure producing the HP, it was the boilers ability to pruduce high volumes of steam to keep the cylinders filled at high speed. [/quote] Dear GP40-2, The volume won't do you any good unless it's under pressure. The steam if it is under any decent amount of pressure whatsoever will expand to fill the full volume of the cylinder. The is then is what pressure it's under, and consequently, how much force it's exerting. Increasing pressure is probably the single most effective way to increase tractive effort and horsepower. Also, the steam does not expand in the admission phase, only cutoff and a little bit in compression (though by the time compression comes, it's pretty much done usefully expanding). In admission, the volume is being fully filled by steam straight fromt the boiler. Just clarifying. Sincerely, Daniel Parks
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