REFLECTOR: Exhaust/cowling

Scott Derrick scott at tnstaafl.net
Tue Dec 25 11:05:05 CST 2007


Aircraft Spruce sells high temp fabric material called Fiberfrax, good 
to 2300F

The high temp glue is called Fiberfrax Adhesive.  Once you glue it on, 
paint the fiberfrax fabric with a couple of coats of the glue to seal 
it.  After the coatings are dry its pretty durable.

I used this on my cowl and it worked great hundreds of hours.

Scott

Michael Watson wrote:
> Tom,
> 
> I have a six cylinder Franklin. the #5 and #6 (closes to the prop)
> runs 1/4 inch from the cowl. I wrapped that area with the standard
> speed shop header wrap, and placed a 4inch by 8inch strip of
> ceramic cloth saturated with hi temp epoxy under the pipe on the
> cowl. No blisters, the cowl remains cool.
> 
> On Dec 24, 2007 3:48 PM, Tom <tomcat05 at comcast.net 
> <mailto:tomcat05 at comcast.net>> wrote:
> 
>     Had a funky 4 into one exhaust (single crossover), mild steel with no
>     slip joints. I knew that this wouldn't work for long and it let go just
>     before I needed plane for Christmas travel to be with family (wife is
>     pissed). Anyhow I called Velocity and was told the two pipe, 2 into one
>     system should be an easy install (IO-360). Bolted up nice and easy but
>     the cowling was hitting the pipes at the #1 cyl (left, rear). Cut a
>     slot
>     in lower cowl and added a blister with 1/2" clearance, wrapped the
>     exhaust and test flew. After landing cowling was bubbling and smoking.
>     Tried some insulation on a 2nd test flight but it was touching exhaust
>     and had similar issues. 2 questions:
>     1) how much clearance do you need between exhaust pipe and cowl?--I'm
>     working on a larger blister now
>     2) what's a good insulation material that's not too wide?? thx Tom
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> 
> 
> -- 
> Mike W.
> 1997 Velocity Elite RG
> Franklin /IVO Electric CS
> 
> 
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