Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Wed, 07 Jul 2004 22:39:52 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d04.mx.aol.com ([205.188.157.36] verified) by logan.com (CommuniGate Pro SMTP 4.2b6) with ESMTP id 246826 for lml@lancaironline.net; Wed, 07 Jul 2004 17:57:41 -0400 Received: from Sky2high@aol.com by imo-d04.mx.aol.com (mail_out_v37_r2.6.) id q.24.5a906ce2 (4328) for ; Wed, 7 Jul 2004 17:57:00 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <24.5a906ce2.2e1dcbac@aol.com> X-Original-Date: Wed, 7 Jul 2004 17:57:00 EDT Subject: Re: [LML] Wheel Wells, noise X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1089237419" X-Mailer: 9.0 for Windows sub 5000 -------------------------------1089237419 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Dan, Even though I am merely flying a lowly 320, I did employ the E.A.R. suggested noise supression material along with ensuring that the D-section (forward of the main spar in the stub wing) damped the "guitar sound-box" effect. I have various foam/dead aluminum on the firewall, nose wheel well, bottom and side fuselage walls as far back as the seat back. Unfortunately (for me), after attenuating those noise sources, the cabin cooling NACAs and the "hot-house" canopy (3/16", Later versions were thicker) contribute more to the cockpit noise (prop generated) than those supressed areas. I would think that all high speed aircraft would benefit from even thicker canopy "glass", wee props (if any) and a more indirect cockpit cooling air source. Or, maybe we should just all wear HELMETS with ANR (ignoring any passenger needs - see ***). Scott Krueger AKA Grayhawk Sky2high@aol.com II-P N92EX IO320 Aurora, IL (KARR) LML, where ideas collide and you decide! *** Fly high, do not turn on passenger O2. -------------------------------1089237419 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Dan,
 
Even though I am merely flying a lowly 320, I did employ the E.A.R.=20 suggested noise supression material along with ensuring that the D-section=20 (forward of the main spar in the stub wing) damped the "guitar sound-box"=20 effect.  I have various foam/dead aluminum on the firewall, nose wheel=20 well, bottom and side fuselage walls as far back as the seat back. = ;=20 Unfortunately (for me), after attenuating those noise sources, the cabin coo= ling=20 NACAs and the "hot-house" canopy (3/16", Later versions were thicker) contri= bute=20 more to the cockpit noise (prop generated) than those supressed=20 areas. 
 
I would think that all high speed aircraft would benefit from even thic= ker=20 canopy "glass", wee props (if any) and a more indirect cockpit cooling=20= air=20 source. Or, maybe we should just all wear HELMETS with ANR (ignoring an= y=20 passenger needs - see ***).=20
 
Scott Krueger=20 AKA Grayhawk
Sky2high@aol.com
II-P N92EX IO320 Aurora, IL=20 (KARR)

LML, where ideas collide and you decide!
 
*** Fly high, do not turn on passenger O2.
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