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Le Massena's "Big Engines" article (1968 Trains)
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<P mce_keep="true">[quote] <P>Using shorter, larger diameter fire tubes would actually lower the total heating surface available, but had great benefits. The larger diameter fire tubes would allow a free flowing exhaust, and the shorter length allowed a longer combustion chamber design. The result was a boiler that on paper looked "smaller" than an older design with a higher number of longer, smaller fire tubes, but was more powerful.</P> <P>[/quote]</P> <P>Excellent explanation here of boiler design. Does Le Massena's "formula" takes concern of that?</P>
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