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Cowl heat protection

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digidocs

Joined: 04 Dec 2013
Posts: 59

Posted: Mon Mar 19, 2018 11:03 am Post subject: Cowl heat protection

Hi list,



What are you doing to protect the cowling from the exhaust heat?  Is it working well?  Pictures would be very welcome.

Thanks,

David

Tim Olson

Joined: 25 Jan 2007
Posts: 2872

Posted: Mon Mar 19, 2018 11:35 am Post subject: Cowl heat protection

I just bought the sheets of aluminum foil self stick from Van's and 

covered the bottom inside of the cowl with it.



It works well. I ended up with a cracked exhaust last week and it

protected the cowl even from that to some degree and I have no damage.



I know I have pictures on my RV10 page of when I did that plane,

but it's really nothing much.  Just paint a layer of resin on

the inside of the cowl bottom to seal it, then peel the backing off

the aluminum foil and stick it on.  Van's will have you put some on

where the exhaust is close, but it's best to just cover the entire

cowl bottom to within a couple inches of each edge.

Tim



On 03/19/2018 02:02 PM, David Carr wrote:

 	  Quote: 	
		   Hi list,

 

 What are you doing to protect the cowling from the exhaust heat?  Is it 

 working well?  Pictures would be very welcome.

 

 Thanks,

 David

Lenny Iszak

Joined: 23 Mar 2008
Posts: 270

Posted: Mon Mar 19, 2018 12:58 pm Post subject: Cowl heat protection

I glued this to most of the bottom cowling with RTV:



THERMO-TEC ALUMINIZED HEAT BARRIER 18"X20"

http://www.aircraftspruce.com/catalog/eppages/alumheatbarrierstops.php?clickkey=75929

Also used these clamp-on exhaust shields in a couple of places where the exhaust pipes get closer to the cowling:



DOUBLE EXHAUST HEAT SHIELD

http://www.aircraftspruce.com/catalog/eppages/exaustheatedshield.php?clickkey=7730



Lenny

 	  Quote: 	
		   On Mar 19, 2018, at 3:02 PM, David Carr <junk(at)dcarr.org> wrote:

 

 Hi list,

 

 What are you doing to protect the cowling from the exhaust heat?  Is it working well?  Pictures would be very welcome.

 

 Thanks,

 David

_________________
Lenny Iszak
Palm City, FL
2014 RV-10, N311LZ - 500 hrs

Mauledriver(at)nc.rr.com
Guest

Posted: Tue Mar 20, 2018 2:30 pm Post subject: Cowl heat protection

Here's what I did after allowing heat to damage my cowling.  The bad 

news is that I had to repair the cowling's inside surface and structure 

(scarfing, cloth, honeycomb).  The good news is that I had a real good 

indication of where the heat problem was.  I have flown 2 years since 

then with no additional damage or concern.    I used red RTV to adhere 

the pieces of foil faced insulation - probably the same stuff Tim used 

but not sure.



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bill.peyton

Joined: 19 Sep 2010
Posts: 198
Location: St. Louis, MO

Posted: Wed Mar 21, 2018 4:51 am Post subject: Re: Cowl heat protection

Stick on reflective heat shield from acs

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_________________
Bill
WA0SYV
Aviation Partners, LLC

digidocs

Joined: 04 Dec 2013
Posts: 59

Posted: Fri Mar 23, 2018 9:59 pm Post subject: Cowl heat protection

I want to say thanks for all of the heat protection advice.  This is a great group we have here.



David

On Fri, Mar 23, 2018 at 5:47 AM, Bill Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)> wrote:

 	  Quote: 	
		                      

                   Not surprised.  I used visible heat         damage (from structural composite damage to singed paint) to         guide my coverage.  There may be more going on than simply         proximity of exhaust system parts to cowling.

         

         I guess the 'safer'  but slightly heavier approach would be to         cover it all as Tim suggested.

         

         On 3/20/2018 9:49 PM, Don McDonald wrote:

       

        	  Quote: 	
		                      I took a pencil and marked the areas that were fairly             close to any exhaust pipe (with the bottom cowl on).  It             looks like your area covered is smaller than mine.... just             sayin'.

           

           

                                        On Tuesday, March 20, 2018, 5:52:10 PM CDT, Bill                 Watson <Mauledriver(at)nc.rr.com> (Mauledriver(at)nc.rr.com)                 wrote: 

               

               

               

               

                                Here's what I did after allowing heat to                   damage my cowling.  The bad 

                 

                 news is that I had to repair the                   cowling's inside surface and structure 

                 

                 (scarfing, cloth, honeycomb).  The good                   news is that I had a real good 

                 

                 indication of where the heat problem                   was.  I have flown 2 years since 

                 

                 then with no additional damage or                   concern.    I used red RTV to adhere 

                 

                 the pieces of foil faced insulation -                   probably the same stuff Tim used 

                 

                 but not sure.

                 

                 

                 

                 

                 

                 

                 

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whodja

Joined: 27 Jan 2014
Posts: 50
Location: Apex NC (near Raleigh)

Posted: Sat Mar 24, 2018 2:52 am Post subject: Re: Cowl heat protection

Has any used or considered using an exhaust wrap such as this for additional heat protection; https://www.heatshieldproducts.com/lava-exhaust-wrap

kdb.rv10(at)gmail.com
Guest

Posted: Sat Mar 24, 2018 9:17 am Post subject: Cowl heat protection

I've thought about it, but so far I've only used it on my car. Works great at keeping the heat in the pipe and out of the engine compartment. In my car, it smelled bad for a couple of months but later it had no smell - I don't know if you would smell it in an airplane. I've heard it makes an airplane exhaust deteriorate due to the higher heat because it is kept in the pipe. Also, may be danger of fire if oil leak is absorbed by wrap.

Kevin Belue



RV-6A



RV-10

On Sat, Mar 24, 2018 at 5:52 AM, whodja <whodja(at)gmail.com (whodja(at)gmail.com)> wrote:

 	  Quote: 	
		  --> RV10-List message posted by: "whodja" <whodja(at)gmail.com (whodja(at)gmail.com)>

 

 Has any used or considered using an exhaust wrap such as this for additional heat protection; https://www.heatshieldproducts.com/lava-exhaust-wrap

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=478839#478839

 

 

 

 

 

 

 ====================================

 -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List

 ====================================

  FORUMS -

 eferrer" target="_blank">http://forums.matronics.com

 ====================================

 WIKI -

 errer" target="_blank">http://wiki.matronics.com

 ====================================

 b Site -

           -Matt Dralle, List Admin.

 rel="noreferrer" target="_blank">http://www.matronics.com/contribution

 ====================================

Lenny Iszak

Joined: 23 Mar 2008
Posts: 270

Posted: Sat Mar 24, 2018 9:32 am Post subject: Cowl heat protection

Also with those on you can’t inspect the exhaust pipes for cracks…



Lenny



 	  Quote: 	
		   On Mar 24, 2018, at 1:17 PM, Kevin Belue <kdb.rv10(at)gmail.com> wrote:

 

 I've thought about it, but so far I've only used it on my car. Works great at keeping the heat in the pipe and out of the engine compartment. In my car, it smelled bad for a couple of months but later it had no smell - I don't know if you would smell it in an airplane. I've heard it makes an airplane exhaust deteriorate due to the higher heat because it is kept in the pipe. Also, may be danger of fire if oil leak is absorbed by wrap.

 

 Kevin Belue

 RV-6A

 RV-10

 

 On Sat, Mar 24, 2018 at 5:52 AM, whodja <whodja(at)gmail.com> wrote:

 

 

 Has any used or considered using an exhaust wrap such as this for additional heat protection; https://www.heatshieldproducts.com/lava-exhaust-wrap

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=478839#478839

 

 

 

 

 

 

 ====================================

 -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List

 ====================================

 FORUMS -

 eferrer" target="_blank">http://forums.matronics.com

 ====================================

 WIKI -

 errer" target="_blank">http://wiki.matronics.com

 ====================================

 b Site -

           -Matt Dralle, List Admin.

 rel="noreferrer" target="_blank">http://www.matronics.com/contribution

 ====================================

_________________
Lenny Iszak
Palm City, FL
2014 RV-10, N311LZ - 500 hrs

Tim Olson

Joined: 25 Jan 2007
Posts: 2872

Posted: Sat Mar 24, 2018 10:04 am Post subject: Cowl heat protection

None of the exhaust manufacturers for Aircraft recommend wrapping the exhaust. Vettermans Warned me even about having areas with a tight heat shield around them.  You want air to the outside of the pipe.  What you will end up with is an exhaust system that does not last as long or fails. The only thing that I have heard that is sometimes done on aircraft exhaust is to ceramic coat them internally.

Tim



 	  Quote: 	
		   On Mar 24, 2018, at 5:52 AM, whodja <whodja(at)gmail.com> wrote:

 

 

 

 Has any used or considered using an exhaust wrap such as this for additional heat protection; https://www.heatshieldproducts.com/lava-exhaust-wrap

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=478839#478839

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