Steam Engine Specifications/Work Diagrams
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Main > Energy > Steam Engine
Design 5
Cutoff: 1/4
Bore: 4"
Stroke: 4"
Boiler Pressure: 50psi
Doing such diagrams is quite informative. Note that the expansion curve falls off below atmospheric pressure near the end of the stroke. Naturally, pressure in the cylinder cannot fall below atmospheric pressure, but it could fall to meet it. This is actually not desired. Some amount of back pressure in the cylinder softens the ends of the stroke cycle. This diagram also indicates how long the bump valve pins need to be in order to reach cutoff at 1/4 of the stroke length. Varying this will impact the amount of work produced in one cycle.