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Design/Modification spreadsheets

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Now I am making a major revision to the expansion chamber calculator.

the new version has an improved power calculator based on logarithmic scale of return wave strength from transfer closing to exhaust port closing..

the exhaust pulse length and strength is now based on a map of the exhaust port.

the pipe change #s (used to calculate the return waves) are now based on the initial exhaust pulse strength and psi changes every 10mm along the pipe.

these are all replacing cruder methods and so will now be very accurate.

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