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Lynn,
You are reading my mind - those things you suggest
is exactly as intended.
The cooling air holes are there to allow the
air within in the cones to expand and contract without
restriction.
I also envisage out of cowl installation or an
air feed to the muffler.
The solid rods are also a must, to tie-in the
inner tube both front and back, maybe. It would be interesting to see it
done in Inconel.
George ( down under)
Ed,
> Cones are the GO.
>
> Any bare edge will
take a battering from the heat and shock waves. Cones
> formed back to
back eliminate any edges.
>
> There must be supporting structure
for the cones, I've used 1/4" solid
> round bar welded into the exhaust
skin.
> George (down under)
Thought must be applied to the idea
that eventually the structure will decompose, and then the pieces thus
liberated, will plug the exit and render the engine a balance weight. As in
the Mistral crash.
Perhaps the back to back cones could be installed over some cooling air
holes in the central pipe.
A solid rod just aft of the cones could support the central pipe and help
prevent such a blockage.
My version would have the entire muffler below the cowl in the airstream.
Maybe there would be room for a collector before the muffler so as to maintain
more engine power.
Lynn E. Hanover
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