Bill Jepson wrote:
>
> Paul, The attached jpeg is a variation on the tangental muffler theme.
> The intent is to cool the exhaust system using the exhaust energy. A
> outside air source is provided near the front. The design could also be
> inverted, (exhaust inside the the can), if the inside tube wouldn't
> provide enough cooling. The tail pipe mixing should also make it a bit
> quieter.  comments? Bill Jepson
>

The above is Bill's original idea.

Below is what I need for the dyno. The distance from the aft rotor exhaust
to the firewall is critical. The dyno uses the stock firewall design and
the KIS motor mount is bolted to that. The whole rig rotates about a shaft
aft of the firewall on the prop center line axis.

Ed, We have about 12 inches to work with so a 3 inch pipe dia with a five

center line bend radius uses up 6.5 inches of that 12 inches. If the

section is 4 inches long that is 10.5 total. That will give us
about 1.5 inches clearance between the 3 inch down pipe and the firewall.
You could also come out the side Ed like the turbo is shown. That would
make the whole rig smaller and lighter just like a turbo prop :)
The con-tan muffler will go about where the turbo is.

You can scale this dwg gif Ed.

I figure a six inch diameter can is plenty with a two inch center
cooling pipe. Keep the can as short as possible to keep the weight down.
Something around seven inches ought to be about right.
The taper outlet diameter on the cooling pipe is 1.5 inches.
The exhaust stubs coming out of the engine are shown as 2 inch diameter.

You can support the inner pipe anyway you see fit Ed.

Paul Lamar

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