Jarret,

I have applied Zetex to the inside of my cowl near the exhaust and also an extra layer over the firewall blanket near where the exhaust exits.  The stuff seems to work great at reflecting the heat and/or insulating from the heat.  When the cowl was bare, it would be too hot to touch after even a short flight.  With just one layer, it barely gets above ambient.  I've also wrapped some of my coolant lines that pass by the exhaust and a portion of my motor mount near the exhaust.  

 

One thing I didn't wrap was the exhaust system itself.  I want to be able to inspect the exhaust for cracks, kinda hard to do with it wrapped.  

 

Mark S. 

 

 

On 3/4/08, Mike Wills <rv-4mike@cox.net> wrote:

What's the current consensus opinion on tape wraps on exhaust pipes? I remember a few years ago there was a case of an exhaust system failure on a canard that resulted in a crash. The theory (I believe) was the tape contained the heat, the pipe overheated and some welds failed.

 

The website for Zetex mentions NASCAR applications for exhaust system wraps.

 

Mike

----- Original Message -----

From: H & J Johnson

To: Rotary motors in aircraft

Sent: Monday, March 03, 2008 8:33 PM

Subject: [FlyRotary] Re: Exhaust? was [FlyRotary] engine installation pictures

 

Anyone on here use Zetex? It's supposed to do wonders for exhaust which is routed near

fiberglass. Just use high temp Silicone to bond it to the cowl [and/or duct] and it

solves all your problems.. I know there was guys over on the Lancair side of the list

who where doing group buy's.. not sure if any of it is left to go around.. It's supposed to

be as good as kevlar is bullet proof..

FWIW

Jarrett

 

> Yep, it's on the list. The exhaust is even closer to the cowl.
> Still need to decide what to do about that.
>
> Mike
>  ----- Original Message -----
>  From: Ed Anderson
>  To: Rotary motors in aircraft
>  Sent: Monday, March 03, 2008 5:37 AM
>  Subject: [FlyRotary] Exhaust? was [FlyRotary] engine
> installation pictures
>
>
>  Really looks nice and clean, Mike.  Good job!
>
>  If you can run 10 minutes at 5300 rpm on the ground and not get
> above 180F then its unlikely you'll have any cooling problems in
> the air.  Although, I have found out what works on the ground and
> what works in the air aren't always the same.  For instance,
> depending on how the exit from your radiator is orientated, higher
> pressure on the underside of the cowl during a climb could impede
> air flow.  But, for now I would say, looks like you are going to
> be another one to get into the air without the "traditional"
> temperature issues.
>
>  One thing I do have a question about.  It "appears" that your
> exhaust stack runs fairly close to your radiator enclosure (which
> I presume is fiberglass).  I think I would put a thin sheet of SS
> between the exhaust and your radiator plenum. 
>
>  Ed
>    ----- Original Message -----
>    From: Mike Wills
>    To: Rotary motors in aircraft
>    Sent: Sunday, March 02, 2008 11:52 PM
>    Subject: [FlyRotary] engine installation pictures
>
>
>    Here are a couple of pictures of my engine install. Had a
> couple of engine runs today including one run at full power (5300
> RPM static) for about 10 minutes. Temps came up to 180 and stopped
> climbing. Things are starting to come together now. Starting to
> have some confidence in this thing.
>
>    Mike Wills
>    RV-4 N144MW
>
>
>

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