Rob> The length of the pipe controls the timing of this wave and
  Rob> thus the "tuning" for a certain RPM.

Does the diameter of the pipe matter?

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Paul Davis
INTP
Lancair Legacy builder
pdavis@bmc.com
Phone 713-918-1550
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Timendi causa est nescire
Ignorance is the cause of fear
Arguments are repl Aviation/Lancair/List /home/pdavis/Mail/drafts/332