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Old Jan 30, 2013, 06:23 AM
GallopingGhostlr is offline
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United States, NM, Clovis
Joined Jan 2013
747 Posts
In this case the muffler has a very small expansion chamber, almost next to none. One doesn't get the adiabatic expansion with each exhaust puff of the engine that would happen with a standard muffler. I ended up doubling the 1/4 inch (6 mm) diameter exit. Since I will be using it on a 33 in. (838 mm) wingspan Midwest P-40 Warhawk profile, it will spend its time 4-2 cycling at a slightly lower RPM. I'll know more when I fly, but it should be acceptable.
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