Bulent Aliev wrote:

You are right Paul. The prop blades get direct blast from the exhaust. On
pushers with Lycomings there are two exhaust pipes on each side, so the
chances of the hot gasses hitting the prop are double. They prevent that by
rotating the prop one bolt  hole at the time in one direction until the
exhaust start hitting between the blades. like machine gun shooting through
the propellor. The rotary with one exhaust  pipe should be easier, but also
we will have more working cycles per RPM???

Routing the exhaust along the spar can be dangerous: One LEZ had broken
exhaust manifold in flight and the hot gasses found their way along the spar,
to the joint with the wing and he had his spar almost melted. Major headache!

I have seen some exhausts going straight down?
Bulent

You won't be able to sync the prop to the exhaust pulse because the 
gear ratio is 2.17:1. If it was exactly 2:1 there would be no problem.

I think it is far enough out so it will not be a problem.
They are also quite far from the spar but a stainless shield on the
spar will not hurt.

Don't forget to check that thrust line position. I am waiting for
that info so I can do a load diagram and upload the works to the web
site.


Paul Lamar
 
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