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Scientific Design of Exhaust and Intake Systems
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I don't have that one sitting on my bookshelf. The only technical book I have on the subject is Physics of Ground Vehicles.
Care to summarize?
The closest I might get to something like this would be to replace the VW's pea-shooter tails pipes with two small Supertrapp mufflers. They're tuneable, maybe the cone-shaped plug in the reference design could be made tuneable as well.
Frank Lee -- maybe the spindle shape could be made by stacking up washers of increasing and then decreasing size, with spacers in between each one. It would be kind of like the silencer on a pistol turned inside out.
I wasn't thinking so much about silencing as decreasing back pressure by coupling the exhaust flow to the ambient air as efficiently as possible. Belled ends on trumpets and other horns would be another example.
Here's a muffler (a mute) for a cornet.