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sound proofing a model 4

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canpilot03(at)yahoo.ca
Guest

Posted: Thu Mar 30, 2006 7:17 am Post subject: sound proofing a model 4

Hi All,

   

   My 582 powered model 4 is awful noisy in the cockpit! So bad it even transmits over my radio and my intercom is always activated because of the noise level!! Anyone have any solutions to remedy this .,ie; What about alumanized bubble wrap or rubberized carpet glued to the inside of the  boot cowl and firewall!( I don't think the stock firwall cover does much sound deadening!! 

                                             Thanks

                                             Gil Levesque

                                             C-IGVL



		

---------------------------------

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smokey_bear_40220(at)yaho
Guest

Posted: Thu Mar 30, 2006 8:53 am Post subject: sound proofing a model 4

Hi Gill,



I assume you mean outside noise and not electrical

interference.



What muffler are you using and where does the exaust

exit compared to your cockpit?



How is your vibration level?



Is it engine noise, prop noise, wind noise, or all the

above?



Soundproofing is always a problem.  Initially I was

going to make my plane as quiet as I could, until I

found out what it would weigh!  In many cases you need

weight to dampen sound, so right off you have a

conflict.



Instead of starting there, I would suggest using a

headset hooked to your intercom to find the loudest

sources and attack them first.  If you can use just a

microphone, it will be better.



Start on the ground with the plane tied down and

running.  Use the free headset microphone by moving it

around the cockpit to locate firewall sound leaks,

drumming, etc and listen on your other headset.  Check

everywhere in the cockpit with the doors closed. 

Windscreen, cowl sides, floor, behind the panel...



When you find specific areas, you can consentrate on

sealing them off or padding them as necessary. 

Aircraft Spruce has quite a lot of products for this. 

You can buy from them, or just look at the product and

find a local substute, but be careful of flamable and

toxic materials.



When you have addressed the problems on the ground,

test while flying.  You have to have someone flying

while someone else is doing the sound hunting.  It

gets a bit crouded, but that is the best way.



Thin windscreens and door panels are a source that

takes thickness and weight to fix.` I left my doors

thin.



I have a padded firewall with a tight fit to the cowl.

 The tight fit helped a lot.  I also added insolation

under the floor where the exhaust exits.  In my case,

it is fine in cruise, and only a problem now at high

power.  I turned the squelch up, but could use a

little more noise reduction.



For my exhaust, I added about a foot square of SS mesh

screen rolled up and fastened into the exhaust to

dampen the engine pop.  It is a 2" exhaust pipe, so it

can handle the mesh along the walls.  Very light

weight and not restricting, but it helps.  Kinda like

a 6 oz glasspack muffler.



If approached this way, you might be able to reduce

the noise enough without adding too much weight.



Hope that helps.



Kurt S.



--- Gill Levesque <canpilot03(at)yahoo.ca> wrote:

 	  Quote: 	
		   Hi All,

    

    My 582 powered model 4 is awful noisy in the

 cockpit! So bad it even transmits over my radio and

 my intercom is always activated because of the noise

 level!! Anyone have any solutions to remedy this

 .,ie; What about alumanized bubble wrap or

 rubberized carpet glued to the inside of the  boot

 cowl and firewall!( I don't think the stock firwall

 cover does much sound deadening!! 

                                              Thanks

                                              Gil

 Levesque

                                              C-IGVL

- The Matronics Kitfox-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Kitfox-List

canpilot03(at)yahoo.ca
Guest

Posted: Thu Mar 30, 2006 9:19 am Post subject: sound proofing a model 4

Kurt,

 The noise is mostly engine!

                                           Gil

  kurt schrader smokey_bear_40220(at)yahoo.com wrote: 



Hi Gill,



I assume you mean outside noise and not electrical

interference.



What muffler are you using and where does the exaust

exit compared to your cockpit?



How is your vibration level?



Is it engine noise, prop noise, wind noise, or all the

above?



Soundproofing is always a problem. Initially I was

going to make my plane as quiet as I could, until I

found out what it would weigh! In many cases you need

weight to dampen sound, so right off you have a

conflict.



Instead of starting there, I would suggest using a

headset hooked to your intercom to find the loudest

sources and attack them first. If you can use just a

microphone, it will be better.



Start on the ground with the plane tied down and

running. Use the free headset microphone by moving

 it

around the cockpit to locate firewall sound leaks,

drumming, etc and listen on your other headset. Check

everywhere in the cockpit with the doors closed. 

Windscreen, cowl sides, floor, behind the panel...



When you find specific areas, you can consentrate on

sealing them off or padding them as necessary. 

Aircraft Spruce has quite a lot of products for this. 

You can buy from them, or just look at the product and

find a local substute, but be careful of flamable and

toxic materials.



When you have addressed the problems on the ground,

test while flying. You have to have someone flying

while someone else is doing the sound hunting. It

gets a bit crouded, but that is the best way.



Thin windscreens and door panels are a source that

takes thickness and weight to fix.` I left my doors

thin.



I have a padded firewall with a tight fit to the cowl.

 The tight fit helped a lot. I also added

 insolation

under the floor where the exhaust exits. In my case,

it is fine in cruise, and only a problem now at high

power. I turned the squelch up, but could use a

little more noise reduction.



For my exhaust, I added about a foot square of SS mesh

screen rolled up and fastened into the exhaust to

dampen the engine pop. It is a 2" exhaust pipe, so it

can handle the mesh along the walls. Very light

weight and not restricting, but it helps. Kinda like

a 6 oz glasspack muffler.



If approached this way, you might be able to reduce

the noise enough without adding too much weight.



Hope that helps.



Kurt S.



--- Gill Levesque <canpilot03(at)yahoo.ca> wrote:

 	  Quote: 	
		   Hi All,

 

 My 582 powered model 4 is awful noisy in the

 cockpit! So bad it even transmits over my radio and

 my intercom is always activated because of the noise

 level!! Anyone have any solutions to remedy this

 .,ie; What about

 alumanized bubble wrap or
	


 	  Quote: 	
		   rubberized carpet glued to the inside of the boot

 cowl and firewall!( I don't think the stock firwall

 cover does much sound deadening!! 

 Thanks

 Gil

 Levesque

 C-IGVL


	


 

 

 





		

---------------------------------

- The Matronics Kitfox-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Kitfox-List

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