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dlm46007(at)cox.net
Guest

Posted: Sun May 04, 2008 8:19 am Post subject: Emailing: IMG_1177

I pulled the cowl after 14 hours and find an exhaust stain below the slip

joint on the three in one. Anybody else see this? The gray spot is a drip of

the anti-seize used to connect the exhaust pipes. No CO in the cabin ; my

meter confirms.

IMG_1177.jpg

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rene(at)felker.com
Guest

Posted: Sun May 04, 2008 8:40 am Post subject: Emailing: IMG_1177

David, do you think that could just be the heat doing that?



Rene' Felker

RV-10 N423CF Flying

801-721-6080

--

flysrv10(at)gmail.com
Guest

Posted: Sun May 04, 2008 8:41 am Post subject: Emailing: IMG_1177

I had the same thing.  Use reflective foil to prevent further burning.



do not archive



On May 4, 2008, at 12:12 PM, David McNeill wrote:



 	  Quote: 	
		  

 I pulled the cowl after 14 hours and find an exhaust stain below the  

 slip

 joint on the three in one. Anybody else see this? The gray spot is a  

 drip of

 the anti-seize used to connect the exhaust pipes. No CO in the  

 cabin ; my

 meter confirms.

 <IMG_1177.jpg>

dlm46007(at)cox.net
Guest

Posted: Sun May 04, 2008 11:28 am Post subject: Emailing: IMG_1177

It could be the heat but the clearance at the three in one is at least 2

inches from the cowl. Perhaps the problem occurs on the ground ; I would

think that in flight there is enough air movement to prevent it from getting

really hot 



--

Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Sun May 04, 2008 12:41 pm Post subject: Emailing: IMG_1177

Yep, a known issue since way back when Randy first flew.  Randy

let us know that the cowl would heat and discolor, so he stuck

on some self-stick aluminum from Vans.  I decided from day one

to do the whole lower cowl, so I brushed on a layer of epoxy

to seal it, and then covered the whole thing with aluminum.

It wipes off nice that way too.



http://www.myrv10.com/N104CD/finishing/20060129/RV200601270023.html

http://www.myrv10.com/N104CD/finishing/20060129/RV200601270025.html

Tim Olson - RV-10 N104CD - Flying



David McNeill wrote:

 	  Quote: 	
		     

 I pulled the cowl after 14 hours and find an exhaust stain below the slip

 joint on the three in one. Anybody else see this? The gray spot is a drip of

 the anti-seize used to connect the exhaust pipes. No CO in the cabin ; my

 meter confirms.

 

 

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

VHMUM(at)bigpond.com
Guest

Posted: Sun May 04, 2008 2:05 pm Post subject: Emailing: IMG_1177

And less drag!



---

pascal(at)rv10builder.net
Guest

Posted: Sun May 04, 2008 2:51 pm Post subject: Emailing: IMG_1177

Any idea how hot it is actually getting to discolor it? wonder what type of 

long term damage this could cause..



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

From: "Tim Olson" <Tim(at)MyRV10.com>

Sent: Sunday, May 04, 2008 1:36 PM

To: <rv10-list(at)matronics.com>

Subject: Re: Emailing: IMG_1177



 	  Quote: 	
		   



 Yep, a known issue since way back when Randy first flew.  Randy

 let us know that the cowl would heat and discolor, so he stuck

 on some self-stick aluminum from Vans.  I decided from day one

 to do the whole lower cowl, so I brushed on a layer of epoxy

 to seal it, and then covered the whole thing with aluminum.

 It wipes off nice that way too.



 http://www.myrv10.com/N104CD/finishing/20060129/RV200601270023.html

 http://www.myrv10.com/N104CD/finishing/20060129/RV200601270025.html

 Tim Olson - RV-10 N104CD - Flying



 David McNeill wrote:

>   I pulled the cowl after 14 hours and find an exhaust stain below the 

> slip

> joint on the three in one. Anybody else see this? The gray spot is a drip 

> of

> the anti-seize used to connect the exhaust pipes. No CO in the cabin ; my

> meter confirms.

> ------------------------------------------------------------------------

>

Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Sun May 04, 2008 3:37 pm Post subject: Emailing: IMG_1177

I think the technical measurement of it is "real hot".

The aluminum film reflects much of the heat and then

you no longer have an issue.  You *could* just put it

where you definitely need it.  I just wanted more all-over

protection.



I'm not sure what actual degree temp it takes to discolor

the fiberglass, but most of the phenolics and materials

like that are surprisingly low in temp handling.

Just protect it and there are no worries.



Tim Olson - RV-10 N104CD - Flying

do not archive

pascal wrote:

 	  Quote: 	
		   

 

 Any idea how hot it is actually getting to discolor it? wonder what

 type of long term damage this could cause..

 

 -------------------------------------------------- From: "Tim Olson"

 <Tim(at)MyRV10.com> Sent: Sunday, May 04, 2008 1:36 PM To:

 <rv10-list(at)matronics.com> Subject: Re: Emailing: IMG_1177

 

> 

> 

> Yep, a known issue since way back when Randy first flew.  Randy let

> us know that the cowl would heat and discolor, so he stuck on some

> self-stick aluminum from Vans.  I decided from day one to do the

> whole lower cowl, so I brushed on a layer of epoxy to seal it, and

> then covered the whole thing with aluminum. It wipes off nice that

> way too.

> 

> http://www.myrv10.com/N104CD/finishing/20060129/RV200601270023.html

>  

> http://www.myrv10.com/N104CD/finishing/20060129/RV200601270025.html

> 

> 

> 

> Tim Olson - RV-10 N104CD - Flying

> 

> 

> 

> David McNeill wrote:

>> I pulled the cowl after 14 hours and find an exhaust stain below

>>  the slip joint on the three in one. Anybody else see this? The

>> gray spot is a drip of the anti-seize used to connect the exhaust

>> pipes. No CO in the cabin ; my meter confirms.

>> 

>> 

>> ------------------------------------------------------------------------

>> 

>> 

> 

> 

> 

> 

> 

 

 http://www.matronics.com/Navigator?RV10-List

AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Sun May 04, 2008 5:06 pm Post subject: Emailing: IMG_1177

350 degrees will begin to yellow the gel coat and white topcoat.  425

will turn it orange and begin to breakdown the honeycomb. At brown, the

honeycomb becomes brittle internally. The foil is a great idea since

once it is broken down it is never as strong as intended originally.



A review of Deems pictures shows an interesting and easy to make heat

shield on the exhaust stacks.



The plastic boys rave on Dupont Ztec.



John Cox

#40600



--

John Ackerman

Joined: 19 Jun 2006
Posts: 130
Location: Prescott, AZ

Posted: Sun May 04, 2008 5:54 pm Post subject: Emailing: IMG_1177

Please tell us a little about it, John!

On May 4, 2008, at 6:01 PM, John Cox wrote:



 	  Quote: 	
		   The plastic boys rave on Dupont Ztec.

AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Sun May 04, 2008 8:37 pm Post subject: Emailing: IMG_1177

I posted information on Zetex several years ago.  It comes in various

thicknesses and is often trimmed at the edge of the firewall with Red

RTV.  The Lancair boys use it in combination to a stainless steel plate

at the exhaust discharge to reduce charring of their fuselage skins.

Tim used a similar but more cost effective product posted on his fine

website on the application after we witnessed what happened to Randy

back in '06. You have to put into perspective that they run with a

composite firewall and don't have the protection VAN provided with the

S.Steel.



It works great on the lower cowl liner within 6" of the exhaust stacks.

Remember those EGT probes go over 1000 degrees.



John



--

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