Bill Jepson wrote:

Paul, The attached jpeg is a variation on the tangental muffler theme.
The intent is to cool the exhaust system using the exhaust energy. A
outside air source is provided near the front. The design could also be
inverted, (exhaust inside the the can), if the inside tube wouldn't
provide enough cooling. The tail pipe mixing should also make it a bit
quieter.  comments? Bill Jepson

snips....

Too bad we don't have a jet engine combustion expert on here.
Basically this is how all jet engines are made to keep from falling
apart due to heat damage. Air passing along the outer sides of the
combustion chamber insulates the walls from the ball of combustion
inside the chamber and keeps the walls from melting. Very intricate
calculations are made to insure the flame ball is kept in the center and
does not touch the walls. Check it out the books sometime.
[Marc Wiese]

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