Edward Klepeis wrote:

Dear Paul
     Instead of  mounting all that weight and moment arm on to a alum
oil pan with alum welding (which doesn't have the fatigue strengh of
welded steel) why
not make boltable  hangers off the motor mount tubes. You can make it
out of thin wall 4130 sq. or round tubing to keep the weight down and
still strong.This
way you can  mount rad, ducting, louvers,what ever on to these
mounts.I have some ideas on how to make a simple strong mount I will
show Jerry when I see him
this week.

Regards

Ed

techwelding@comcast.net

That was Jerry's idea. I kind of like it but if you don't think it is
practical
then....

Paul Lamar

We are still at the beginning and lots of ideas will surface.  However,
  on the  folded aluminum pan bottom,   the entire pan would be made
out of heavier material around .100"/.125."   It would have to be
tested and proven.

  The custom pan could also be made from .063 4130.  It would not weigh
any more than the stock pan and would meet  the  concerns about fatigue
strength.   The windage tray would have to be reproduced in steel but
that is no big deal.   The weight difference between the thick aluminum
and the thin steel pans is not worth thinking about.

Aluminum or steel, the length of weld running around the pan flange is
approximately 55 inches.  That length of fillet  is hugh structurally,
I think.   It must be strong enough to handle the forces generated when
the louvers are lowered into the air stream.

The louvers:   Here is a pic of my rad setting on top of the louvers
which are about half open.  They can be closed flush or deployed to 45
degrees for taxiing.    When open, they  provide a low pressure,
unobstructed exit area as large as the radiator. Above the radiator
will go a wedge shaped plenum.   Paul,  would it be useful if I took
another picture straight on from the side  that you could add a drawing
of  the plenum to?    Jerry

On second thought all airplane kit cowling are different. I don't think
we are ready to standardize on such a device. Also some builders are still
not convinced the bottom rad is the way to go. On the other hand it would be nice
to have an integrated  liquid cooled engine you could plug in like one does
with an air cooled engine. Francois ought to take a close look at this.

Paul Lamar
 
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