> Paul, based upon the series of pictures I've seen, it appears that the
air
comes
> into the oval chin scoop turns almost 180 degrees to pass thru the
radiator
> then over the engine (opposite to plane's direction) then turns again to
go out
> over the exhaust and exits thru the enlarged duct. Is this correct?
Yes it is.
Actually, I got down on my knees and looked into the duct. The first thing
you see is the oil pan. The intake air presurises the cowl then goes through
the radiator and out the bottom. The exhaust maniford is well isolated from
the rest.
Dave Leonard
After re-reading that. I made a serious mistake. The air comes in the scoop
does a 180 through the rad and out the bottom. that is probably an over
simplification. More precisely the cowl is pressurizes like Dave says by
the scoop, heat is added to the air by the engine and conduction from the shielded
exhaust. Then it goes through the rad and out the bottom passing the exhaust
pipe once more. I am not sure if there is a radiation shield on the exhaust
pipe passing behind the radiator although there should be.
As far as I can tell the shield on the exhaust is ineffective because there
is no separate cooling airflow between the exhaust pipe and the exhaust pipe
shield. Heat is radiated and conducted to the shield and it probably runs
near as hot as the exhaust pipes themselves. A simple blast tube would help.
It would be best to do things the other way around. Cool air through the
rad and then through the rest of the cowl and past the engine and exhaust pipes.
After thinking about it for several days the only practical way I can see of
doing it, given the low position of the engine and the tri-gear, is to use two
large area, thin rads mounted vertically on either side of the engine with
conventional cheek inlets. Similar to Jim Mosur's set up. I got some pictures
around here some place.
Paul Lamar
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