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10-06-2017, 02:19 PM
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#1
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Senior Member
City: Gustavus
Vessel Name: Troll Hunter
Vessel Model: Allweather
Join Date: Oct 2016
Posts: 163
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Sound Absorption in Pilothouse
I have reduced considerably the noise from my engine in various ways. My pilothouse ceiling is bare fiberglass (plywood core) and I would like to cover it with some kind of sound absorption material. There are no beams or stringers. What materials have you used and how effective was it? There is regular foam backed vinyl but it seems too thin to be effective. It would be good to have a surface that is somewhat resistant to damage and washable.
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10-06-2017, 03:16 PM
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#2
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Guru
City: Victoria TX
Vessel Name: Bijou
Vessel Model: 2008 Island Packet PY/SP
Join Date: Nov 2012
Posts: 5,290
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I would talk to this guy
Steve Moyer
Soundown
954 761-9188
www.soundown.com
I installed some of their lead sandwiched panels around my generator and it really helped.
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10-06-2017, 03:31 PM
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#3
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TF Site Team
City: Jacksonville
Join Date: Nov 2008
Posts: 11,682
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We played around trying to reduce noise in our pilot house. What worked surprisingly well for us was just hanging a heavy fabric curtain at the top of the stairs going up into the pilot house from the saloon/galley area. I think it directly absorbed the sound before it got there. Our engine is pretty much centered under the saloon floor.
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10-06-2017, 05:26 PM
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#4
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Grand Vizier
Join Date: Jan 2010
Posts: 3,816
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I lined Delfin with 1/4" additional cork before installing 2" coast guard Batts. It is a very good sound deadener in and of itself. www.jelinek.com
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10-06-2017, 06:10 PM
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#5
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Guru
City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 3,023
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Some people use egg cartons... Seriously, stopping the sound before it leaves the engineroom works best. Lead sheeting on the inside of the engine room and foam on the outside.
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10-06-2017, 06:36 PM
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#6
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Guru
City: South Florida
Join Date: Sep 2014
Posts: 1,088
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What AK wants to do is reduce reverberation in the Pilot House, not reduce the transmission of engine noise from the engine room.
Covering it with just about anything soft will do the job, 1/2" of just about any soft foam covered in a thin vinyl (to allow noise transmission) will work, even 1/4" is good. The perforated vinyl headliners look very traditional and the perforations actually improve the absorption performance, but if anything wet ever gets though those holes and into the foam it will "bleed" if you touch it. That's why I prefer to give up some performance for a cleanable surface that's also a vapor barrier for the foam and will make it last longer.
It's actually more important to cover the hard surface than what you cover it with.
Quote:
Originally Posted by ak-guy
I have reduced considerably the noise from my engine in various ways. My pilothouse ceiling is bare fiberglass (plywood core) and I would like to cover it with some kind of sound absorption material. There are no beams or stringers. What materials have you used and how effective was it? There is regular foam backed vinyl but it seems too thin to be effective. It would be good to have a surface that is somewhat resistant to damage and washable.
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10-06-2017, 08:24 PM
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#7
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Guru
City: NARBONNE
Vessel Name: 'Snow Mouse.'
Vessel Model: BROOM FLYBRIDGE 42.
Join Date: Apr 2014
Posts: 1,733
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What I did was to ensure all mechanical pieces, engine mountings/engine/gearbox/shaft etc.are perfectly installed/aligned. If the air intake is attached directly to the engine then using a paper filter type air cleaner route it away from the engine and near to fresh air vent, don't forget to use reinforced hose that won't collapse from the suction, that will reduce engine intake roar by 30%.
I used a foam lead foam sandwich soundproofing with a wipe free surface called Quietlife to line the engine room and then I seated the floor bearers on a light foam.
That system worked perfectly well for me and hopefully it will for you.
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10-07-2017, 05:57 AM
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#8
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Veteran Member
City: Leamington ON
Vessel Name: Tootles
Vessel Model: Nordic 26
Join Date: May 2017
Posts: 59
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I too can recommend that Steve Moyer at Soundown.com has a wealth of ideas and solutions
Jim
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10-07-2017, 06:07 AM
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#9
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Guru
Join Date: Oct 2007
Posts: 22,553
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Std in dirt housing is 3/4 inch thick fiberglass with a sound damping facing.
It will require battens or T strips to hold it in place.
Some will create a "dentist office" look, but the same material is available in planks pattern that is more shippy.
Sound is energy , so it takes some material thickness to absorb it.
My dream is a noise cancelling gadget that could simply be powered to absorb the noise.
A portable one for resturants would be great too!
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10-07-2017, 10:23 AM
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#10
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Grand Vizier
Join Date: Jan 2010
Posts: 3,816
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Quote:
Originally Posted by FF
Std in dirt housing is 3/4 inch thick fiberglass with a sound damping facing.
It will require battens or T strips to hold it in place.
Some will create a "dentist office" look, but the same material is available in planks pattern that is more shippy.
Sound is energy , so it takes some material thickness to absorb it.
My dream is a noise cancelling gadget that could simply be powered to absorb the noise.
A portable one for resturants would be great too!
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For Delfin's refit, sound deadening involved spraying the entire inside of the hull with sound deadening compound, then lining it with acoustical cork, then coast guard batts except in the ER where high density foam vinyl sandwich from Sounddown was used. In any case, she is very quiet.
Like you FF, I have wondered whether it would be possible to use similar technology to that in sound deadening head phones to generate specific wavelengths of sound to counter individual noises on a particular boat.
__________________
"Dad always thought laughter was the best medicine, which I guess is why several of us died of tuberculosis." - Jack Handey
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10-08-2017, 06:58 AM
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#11
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Guru
Join Date: Oct 2007
Posts: 22,553
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"Like you FF, I have wondered whether it would be possible to use similar technology to that in sound deadening head phones to generate specific wavelengths of sound to counter individual noises on a particular boat."
The tech is cheap and robust enough that it is built into mufflers on high tech cars .
To get rid of the din in an eatery , I would even carry a Boom Box sized unit if it would work!
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10-08-2017, 12:36 PM
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#12
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Senior Member
City: Texas
Vessel Model: 37' C&L Double Cabin
Join Date: Feb 2017
Posts: 192
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Some turboprop airplanes also have a system like that
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10-13-2017, 02:46 AM
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#13
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Guru
City: Punta Gorda, fl
Vessel Name: Escapade
Vessel Model: Nordic Tug 37 2002
Join Date: Jan 2015
Posts: 1,231
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Sound Absorption in Pilothouse
Take a look at the ceilings installed in Nordic Tugs.
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10-13-2017, 03:32 AM
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#14
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Master and Commander
City: Vallejo CA
Vessel Name: Carquinez Coot
Vessel Model: penultimate Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 12,559
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My builder did a decent job in reducing engine noise in living spaces. Ceilings are soft, and the floor above the engine compartment is several inches thick.
__________________
Kar-KEEN-ez Koot
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