02-18-2009, 01:32 PM
Sumpter250 Wrote:Oh grate! the draft!
"Combustion air", is draft. the flow, for a steam locomotive is through the flues and tubes,and up the stack......but, before it gets to the flues and tubes, it has to be heated by the fire, in the firebox, on the grates, which sit just above the ashpan, and are shaken to get the ash out of the way so that air can pass more easily from the lower edges of the firebox( just below the mud ring),
Is this combustion air reglulated by any sort of damper? Or is it smiply a gap above the ashpan?
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Kevin
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