Ho, ho!
The Grob 115e uses a Lycoming O-360 fuel injected, 180hp engine, and it's
probably that and the prop together causing the problem.
There's a piece on the c172 on this web page:
http://www.lightspeedaviation.com/content.cfm/Knowledge-Base/Tutorials/ANR-101-A-Tutorial-on-Active-Noise-Reduction/Section-3-Airplane-Issues
Which seems to confirm your story, Bill.
Chris
On 16 May 2010, at 17:28, Sue Pearce wrote:
> 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.
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