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Cowl heat protection

 
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digidocs



Joined: 04 Dec 2013
Posts: 36

PostPosted: Mon Mar 19, 2018 11:03 am    Post subject: Cowl heat protection Reply with 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


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Tim Olson



Joined: 25 Jan 2007
Posts: 2767

PostPosted: Mon Mar 19, 2018 11:35 am    Post subject: Cowl heat protection Reply with quote

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


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Lenny Iszak



Joined: 23 Mar 2008
Posts: 246

PostPosted: Mon Mar 19, 2018 12:58 pm    Post subject: Cowl heat protection Reply with quote

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


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Lenny Iszak
Palm City, FL
2014 RV-10, N311LZ - 450 hrs
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Mauledriver(at)nc.rr.com
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PostPosted: Tue Mar 20, 2018 2:30 pm    Post subject: Cowl heat protection Reply with quote

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: 188
Location: St. Louis, MO

PostPosted: Wed Mar 21, 2018 4:51 am    Post subject: Re: Cowl heat protection Reply with quote

Stick on reflective heat shield from acs

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digidocs



Joined: 04 Dec 2013
Posts: 36

PostPosted: Fri Mar 23, 2018 9:59 pm    Post subject: Cowl heat protection Reply with quote

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: 36
Location: Apex NC (near Raleigh)

PostPosted: Sat Mar 24, 2018 2:52 am    Post subject: Re: Cowl heat protection Reply with quote

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

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PostPosted: Sat Mar 24, 2018 9:17 am    Post subject: Cowl heat protection Reply with quote

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






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Lenny Iszak



Joined: 23 Mar 2008
Posts: 246

PostPosted: Sat Mar 24, 2018 9:32 am    Post subject: Cowl heat protection Reply with quote

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






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Lenny Iszak
Palm City, FL
2014 RV-10, N311LZ - 450 hrs
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Tim Olson



Joined: 25 Jan 2007
Posts: 2767

PostPosted: Sat Mar 24, 2018 10:04 am    Post subject: Cowl heat protection Reply with quote

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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