Ben Baltrusaitis wrote:

Paul and everyone,
I need some help with cooling a Kitfox 5 with an EJ-22 Subaru. I bought
this plane so I have something to fly while my Acroduster Too w/20B is
under construction.
My problem is that on climbout it is running hot. (Cruise is no
problem.)This is due to the fact that the air is flowing over the
muffler and then through the radiator.
I need a simple cheap fix. I would rather not redo the whole cowl and
radiator position as I will probably sell this plane after my
Acroduster is flying. However, if I must I will.
I have thought about ducting the muffler to dump air in front of the
radiator, keeping the flow out of the radiator. I don't know if that
will destroy the air flowing from radiator exit.
Another problem area, there is also little clearance under the radiator
for a good flow out. I know from your recommendations that the
clearance is tight. If you tell me I must move the radiator, I
will, but would rather not. I think this engine could be cooled with a
smaller radiator if it was properly setup. The radiator size was
doubled after it was test flown.
Thanks! Your ideas will be most appreciated!
Ben
(Short for Benedict)

Yep! Sure is in a bad place. You might try a sheet metal wedge shaped
diffuser and
come in to the right top end of the rad and up to the right cowl scoop
with a six
inch SCAT hose. The sheet metal wedge should shield it from the radiant
heat from
the muffler. Seal the duct perfectly.

Paul Lamar

Also cut away the bottom of the cowl directly under the rad and use a
straight down exit duct also sealed to the core.

Paul Lamar

Paul, should I duct the area under the radiator as the attached? What about
an exit duct under the muffler?
Thanks!
Ben

You don't need to get that fancy for a slow airplane. Just a simple
fixed flap will work fine.

Paul Lamar
 
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