|
|
Aircraft Spruce provides a link to the Sound Proofing "How-to Manual" as well ...
http://www.aircraftspruce.com/catalog/appages/soundproofinstall.php
Jeff
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mike Wills
Sent: Sunday, September 13, 2009 11:57 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: cockpit soundproofing
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" <flyrotary@lancaironline.net>
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
>> <mailto: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
|
|