"Castle, Ron" wrote:

Paul, I just looked over the cozy motor mount setup. You have the

exhaust

running thro the wings. The spar in the back is where the wing

attachments

are. it runs up to the fuselage.

Yes the exhaust pipes are behind the spar and they go that far out
to reduce the hot exhaust impinging on the prop. With a non integer
gear reduction such as most psru's available it is not possible
to sync the prop to exhaust pulses. That burns the prop. So that is
the reason why the pipes are shown like that. Flex pipes could be used and
a
tangential muffler could be used out there. That would keep the nice long
tuned pipes and cut the noise.

Paul Lamar

"Castle, Ron" wrote:

Thats the problem the wing is right where you are trying to run the
exhaust. That spar is covered by the wing, there is no space there.

I think we are not talking about the same part. The spar is inline with the
fire wall on most pushers so it is well ahead of the engine and well ahead of
where the exhaust pipes come out of the engine. The drawing is to scale.
Now there is cowling there and that may be needed to be made from
metal around the exhaust pipes.

In this picture of Tom Jordans airplane you can see the muffler fairly
close in to the engine. You can also make out the burn parts on the prop.
The spar is inline with the firewall and well ahead of the muffler.

Paul Lamar
 
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