Finn,

Yes, I will definitely be watching the HP-2 to monitor how well it survives.  FiberFrax is what I had used, not Zetex as I incorrectly stated earlier.  There is also a firewall blanket that wraps down the firewall and back into the exhaust tunnel.  The FiberFrax is so light that an extra layer or two is well worth its weight for the peace of mind it brings.
 

Mark
 

On 1/14/08, Finn Lassen <finn.lassen@verizon.net> wrote:

Although the melting of the insulation material is interesting, have a
look at the holes in the center cone. My guess is that after a few more
flights it will be gone and the carefully engineered "conversion of
sound into heat" will stop melting the insulation material (if not
already gone by then).

I insulated the bottom of the fuselage from the "muffler" by sandwiching
FiberFrax (from Aircraft Spruce) between the fuselage and very thin
stainless steel stock pop-rivitet to the skin.

Finn

Mark Steitle wrote:
> OK, I can see this is going nowhere.  So I guess I'll have to tell
> you.   This is what came out of my new HP-2 muffler after a short 20
> minute flight.  What you saw in the previous picture was the packing
> material MELTING and dripping out the end of the muffler.  In the
> second picture, you can see it oozing out of the little holes in the
> intermediate housing.  I was expecting it to "blow out" eventually,
> but I wasn't expecting it to melt and run out the tailpipe.  This just
> blows my mind.  Where to go from here???  Maybe I should replace the
> packing with titanium shavings, or lithium crystals.
>
> Mark
>


--
Homepage:   http://www.flyrotary.com/
Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html