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Re: [OM] OT: Noise levels in light aircraft, was More eruptions

Subject: Re: [OM] OT: Noise levels in light aircraft, was More eruptions
From: Chris Barker <ftog@xxxxxxxxxxxxxx>
Date: Sun, 16 May 2010 19:09:54 +0100
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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