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Noisy Europa

 
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ami(at)mcfadyean.freeserv
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PostPosted: Sat Jun 06, 2009 12:19 pm    Post subject: Noisy Europa Reply with quote

Whilst grateful for the general quietness of the Europa, inside and out, the cabin NACA vents and associated 'eyeball' contribute substantially to cabin noise.
If during flight the vent is temporarily blocked with ,say, a finger, the reduction in overall noise (possibly including some external engine noise coming through the vent) is noticeable. Same thing can be experienced on an airliner.

Does anyone have any advice as to how these vents can be quietened?

Duncan McF.
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nwcmc(at)tiscali.co.uk
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PostPosted: Sat Jun 06, 2009 12:41 pm    Post subject: Noisy Europa Reply with quote

My overhead eyeball vents are fed from an outward opening flap in the roof. I have the flap fully open for take-off and landing but have it only just cracked open in the cruise even on a hot day. The noise level drops dramatically with it like this so perhaps if you can control the input flow to the eyeball vents you will control the noise as well as the flow. High pressure air against a partially open eyeball vent is likely to be noisier than if the source is controlled before it gets to the eyeball.

Nigel Charles

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n914va(at)bvunet.net
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PostPosted: Sat Jun 06, 2009 2:40 pm    Post subject: Noisy Europa Reply with quote

Could you post some pictures of how you constructed this vent and how you control the opening width?

Vaughn Teegarden
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nwcmc(at)tiscali.co.uk
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PostPosted: Sun Jun 07, 2009 12:21 am    Post subject: Noisy Europa Reply with quote

I will do when I get a chance. I am away from home at the moment.
The most important thing to appreciate is that any hole cut in the roof section needs substantial reinforcing as this is a strength critical area. This wasn't difficult to achieve. It required a layup of 6 plies of 'bid' over a 3mm ply panel which was about 150mm square.
The work was definitely worthwhile as it ensures ventilation to the face rather than the knees. Even with the UK climate there are times in summer when it makes the difference.
Nigel
[quote]----Original Message----
From: n914va(at)bvunet.net
Date: 06/06/2009 23:38
To: <europa-list(at)matronics.com>
Subj: Re: Europa-List: Noisy Europa

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Vaughn Teegarden
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hurstkr(at)redzone.com.au
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PostPosted: Mon Jun 08, 2009 4:09 am    Post subject: Noisy Europa Reply with quote

Duncan,

In the C172 I once owned, I made the vents much quieter by stuffing some steel wool into the duct. Steel is a misnomer because it was actually the plastic stuff.

Best regards
Kingsley
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