X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-bw0-f206.google.com ([209.85.218.206] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3848187 for flyrotary@lancaironline.net; Sat, 12 Sep 2009 19:34:58 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.218.206; envelope-from=msteitle@gmail.com Received: by bwz2 with SMTP id 2so1446262bwz.19 for ; Sat, 12 Sep 2009 16:34:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=dwHjOxD3rxoxtXAuKLqJcET3rXMAXqesmI19DdKlIvM=; b=wjSJHSfuALHnO51pw8dr3etzUCCk1eBdkFwtY+IJ9filfLbLwTGnFmGowhtj+grer/ t/HUK7S1QYQ92uVxoFKTUg5ZTUEa4NdbyqbD2ZS96SMDRJ0QznSUQCKbTs4wiBacfuy8 BfRxRlTB0W9Lb+N8YfI5ZxPVgM5i766ZI7j7o= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=qBbKr/BX4Ek67KSvI8wO4mTHxSZbin13qbHgx4PuFHuaGs0X9UzebS3wRV68exZm8H jMHPyvjSh0aPOtctKmI4his0P8i+RKfssoIeLFxTaHpb0oXsHe/LmH7mpHFHt96PQ/y1 UW7hRuJZNX7ifHRscjxH7v7Jskc+yTfGU+wLo= MIME-Version: 1.0 Received: by 10.204.9.1 with SMTP id j1mr3615295bkj.185.1252798461212; Sat, 12 Sep 2009 16:34:21 -0700 (PDT) In-Reply-To: References: Date: Sat, 12 Sep 2009 18:34:21 -0500 Message-ID: <5cf132c0909121634h62bca1a6w1e1f0e941db54384@mail.gmail.com> Subject: Re: [FlyRotary] Re: cockpit soundproofing From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=00151758f34c41797f047369df5b --00151758f34c41797f047369df5b Content-Type: text/plain; charset=ISO-8859-1 Charlie, You're correct, turning the pipe down does add drag, but so does hanging a big square suitcase shaped box under the fuse. It just depends on how badly you want to quiet things down. Mark On Sat, Sep 12, 2009 at 3:03 PM, Charlie England wrote: > Mark Steitle wrote: > >> Mike, >> My first line of defense against the noise is an ANR headset. That's a >> given. >> I purchased some black foam from ACS that I installed on the interior >> walls and floor. From what I've read a lot of the noise comes in through >> the firewall and windows. Not much you can do about the windows, but it >> seems that a generous amount of soundproofing on the firewall will help the >> most. Lastly, you can turn the exhaust down so that it is directed away >> from the occupants? Or, run it back behind the pax, and fly faster than the >> speed of sound so it can't catch up to you. Mark S. >> >> On Sat, Sep 12, 2009 at 10:15 AM, Mike Wills > rv-4mike@cox.net>> wrote: >> >> I asked a few days ago and got no replies. Since things are a bit >> slow on the list now I'll try again. Anyone have any >> recommendations for a decent soundproofing material that I can add >> to my firewall and floorboards to tame this racket? Maybe the rest >> of the world will have to deal with the noise, but at least I can >> try to make it a little more pleasant for me. >> Mike Wills >> RV-4 N144MW >> >> >> Running it back past the occupants can actually be effective. Turning it > down adds drag. > > I've often wondered why no one has tried carrying the pipes down several > inches below the fuselage before turning them aft, and installing streamline > inserts aft of the downpipes & between the fuselage bottom & the horizontal > run of pipe, to get smooth air between the fuselage & the now-parallel > exhaust stream. > > Charlie > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > --00151758f34c41797f047369df5b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Charlie,
=A0
You're correct, turning the pipe down does add drag, but so does h= anging a big square suitcase shaped box under the fuse.=A0 It just depends = on how badly you want to quiet things down.=A0
=A0
Mark
=A0


=A0
On Sat, Sep 12, 2009 at 3:03 PM, Charlie England= <ceengland= @bellsouth.net> wrote:
Mark Steitle wrote:
Mike,
=A0My first line of def= ense against the noise is an ANR headset. =A0That's a given.
=A0I pu= rchased some black foam from ACS that I installed on the interior walls and= floor. =A0From what I've read a lot of the noise comes in through the = firewall and windows. =A0Not much you can do about the windows, but it seem= s that a generous amount of soundproofing on the firewall will help the mos= t. =A0Lastly, you can turn the exhaust down so that it is directed away fro= m the occupants? =A0Or, run it back behind the pax, and fly faster than the= speed of sound so it can't catch up to you. =A0Mark S.

On Sat, Sep 12, 2009 at 10:15 AM, Mike Wills <rv-4mike@cox.net <mailto:rv-4mike@cox.net>> wro= te:

=A0 =A0I asked a few days ago and got no replies. Since things are a bi= t
=A0 =A0slow on the list now I'll try again. Anyone have any
=A0= =A0recommendations for a decent soundproofing material that I can add
= =A0 =A0to my firewall and floorboards to tame this racket? Maybe the rest =A0 =A0of the world will have to deal with the noise, but at least I can=A0 =A0try to make it a little more pleasant for me.
=A0 =A0 =A0 =A0Mik= e Wills
=A0 =A0RV-4 N144MW


Running it back past = the occupants can actually be effective. Turning it down adds drag.

I've often wondered why no one has tried carrying the pipes down se= veral inches below the fuselage before turning them aft, and installing str= eamline inserts aft of the downpipes & between the fuselage bottom &= ; the horizontal run of pipe, to get smooth air between the fuselage & = the now-parallel exhaust stream.

Charlie

--
Homepage: =A0http://www.flyrotary.com/Archive and UnSub: =A0 http://mail.lancaironline.net:81/list= s/flyrotary/List.html

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