X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-ew0-f213.google.com ([209.85.219.213] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3849559 for flyrotary@lancaironline.net; Sun, 13 Sep 2009 19:09:14 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.219.213; envelope-from=wdleonard@gmail.com Received: by ewy9 with SMTP id 9so1640570ewy.1 for ; Sun, 13 Sep 2009 16:08:38 -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=FaEpqaL9YiqU/NjoLkvwH9t80J931uaqOLmyPb9AFHg=; b=Tt4nDfOC96VEUukH3SsMeuOKFtMhRjhA1uuM4pu0k7n8KRm+ELlBPDUDL63jo50s9L TrdF77YfByBiqcrTdWx6GYp1gDjB+FmTVu8aRGteKwn0mgUTcrh0sEKPez8uTnvarrxe v+V5PGui0ecmW32Vh9qR++GrWyeK8TvPy0Vt0= 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=LTwtrMeS+B6zQ1m53rog8RarDxwXfhMgBdJhilA//YMbt9fBsBaLgYLYvAym2AL1p+ ZVlNgg9PH5Nw1ehB8T182qIwuwUmXR6Z93oUowHcLlWmIKXW3pn6nIb3XcseJIb1nfMY X9zcjyqKggSZBhNBvZ+TeEiLAtFmHCca9I5gw= MIME-Version: 1.0 Received: by 10.211.154.10 with SMTP id g10mr6147792ebo.49.1252883318839; Sun, 13 Sep 2009 16:08:38 -0700 (PDT) In-Reply-To: References: Date: Sun, 13 Sep 2009 16:08:38 -0700 Message-ID: <1c23473f0909131608v647f920fnfc92c2ed8a1bb575@mail.gmail.com> Subject: Re: [FlyRotary] Re: cockpit soundproofing From: David Leonard To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=00504502c7a22a1a8a04737da10d --00504502c7a22a1a8a04737da10d Content-Type: text/plain; charset=ISO-8859-1 I used the same stuff as well. seemed to do some good, but I probably could have done a better job sealing the firewall. I have 1.25" on the floor and firewell, and 1/4" on the sidewalls. That made a nice base for the leather too. One problem with the closed cell foam is that it expands quite a bit at altitude, expecially the thick stuff. Above 10,000' my floor piece (covered with carpet) expands enough that it no longer seats and it partly lifts off the floor. Dave Leonard On Sun, Sep 13, 2009 at 8:57 AM, Mike Wills wrote: > I should have mentioned. My original muffler (which I am reinstalling) had > a turndown of about 20 - 30 degrees. The DNA had no turndown. Again, no > detectable difference in noise or performance between the two. > > Found a how-to from the manufacturer of the black foam Mark and Tracy > mentioned here: > > http://www.soundproofing.org/infopages/soundprf.html > > Wish I'd installed this stuff in the floorboards before I closed the > interior structure. > > Mike Wills > RV-4 N144MW > ----- Original Message ----- From: "Charlie England" < > ceengland@bellsouth.net> > To: "Rotary motors in aircraft" > Sent: Saturday, September 12, 2009 1:03 PM > Subject: [FlyRotary] Re: cockpit soundproofing > > > 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 >> >> > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > -- David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net --00504502c7a22a1a8a04737da10d Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
I used the same stuff as well.=A0 seemed to do some good, but I probab= ly could have done a better job sealing the firewall.=A0 I have 1.25"= =A0on the floor and firewell,=A0and 1/4" on=A0the sidewalls.=A0=A0That= made a nice base for the leather too.=A0 One problem with the closed cell = foam is that it expands quite a bit at altitude, expecially the thick stuff= .=A0 Above 10,000' my floor piece (covered with carpet) expands enough = that it no longer seats and it partly lifts off the floor.
=A0
Dave Leonard

On Sun, Sep 13, 2009 at 8:57 AM, Mike Wills <rv-4mike@cox.net&= gt; wrote:
I should have mentioned. My orig= inal muffler (which I am reinstalling) had a turndown of about 20 - 30 degr= ees. The DNA had no turndown. Again, no detectable difference in noise or p= erformance between the two.

Found a how-to from the manufacturer of the black foam Mark and Tracy m= entioned here:

http://www.soundproofing.org/infopages/soundp= rf.html

Wish I'd installed this stuff in the floorboards before I closed th= e interior structure.=20


Mike Wills
RV-4 N144MW
----- Original Messa= ge ----- From: "Charlie England" <ceengland@bellsouth.net>
To: &qu= ot;Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, September 12, 2009 1:03 PM=20

Subject: [FlyRotary] Re: cockpit soundproofing

Mark Steitle wrote:
Mike,
=A0My first line of defense against the noise is= an ANR headset. =A0That's a given.
=A0I purchased some black foam f= rom ACS that I installed on the interior walls and floor. =A0From what I= 9;ve read a lot of the noise comes in through the firewall and windows. =A0= 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 t= he exhaust down so that it is directed away from the occupants? =A0Or, run = it back behind the pax, and fly faster than the speed of sound so it can= 9;t catch up to you. Mark S.

On Sat, Sep 12, 2009 at 10:15 AM, Mike Wills <rv-4mike@cox.net <mai= lto:rv-4mike@cox.net<= /a>>> wrote:

=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 Mike Wills=
=A0 =A0RV-4 N144MW


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

I've often wondered why no one h= as tried carrying the pipes down several inches below the fuselage before t= urning them aft, and installing streamline inserts aft of the downpipes &am= p; between the fuselage bottom & the horizontal run of pipe, to get smo= oth air between the fuselage & the now-parallel exhaust stream.

Charlie

--
Homepage: =A0http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html<= br>



--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
--00504502c7a22a1a8a04737da10d--