Eh? What you say?
What are the powerplants on these aircraft?
When my father was alive, one of the projects he worked on was noise
attenuation for light aircraft (Cessna 172, Piper equivilent). It involved
extending the exhaust quite a ways under the fuselage, and fabricating a
muffler, which had a lot more engineering involved in the design than a car
muffler. Alas, after mcuh work, it was deemed a wasted effort, as not
sufficiently effective.
Good luck.
Bill Pearce
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