OK I got it!! This picture did it for me.

Do away with those silly box sections and sections of the
fuselage  that mount the lower motor mount tubes. Make steel
brackets that
picks up the landing gear bolts and fasten the tubes directly
directly to the landing
gear bolts. That is where the high G engine loads ultimately go
anyway.
That will allow a wider and shorter rad, giving more room above the
rad for clearance and solve a whole lot of pusher cooling problems
not to mention doing away with some heavy redundant structure.
Mount the rad horizontal like before. this should work on every
pusher
ever built. You can add a structural bulkhead from the bottom aft
edge of the spar forward to just above the landing gear bolts if you
wish.

I'll do a 3D.

Paul Lamar

Here it is.

Looks like you can use a 16 by 19 by 2 inch rad and still get the
oil cooler along side. Nice and clean and simple.

Paul Lamar

It is indeed nice, clean and simple.  The creative process seems to go
from complexity to simplicity.  You will loose some  of the available
radiator  space to the louver frame.   It makes the radiator about 1.5
inches wider.   Jerry

Thanks Jerry. In my not so humble opinion it was a stroke of
structural genius
given all the people that have redesigned Burt's original effort.
I just followed the load path.

Only 1.5 inches? I think it is more like three or four inches.

The pushers have been a pain in the butt to squeeze an adequate
size rad in up to now :) Perry's water rad works well because that big
fan sucks the air through like gangbusters.

Paul Lamar

The louvers  add 1.5 inches to the rad's width..   My new Radiator was
shipped today and maybe I can get that package together before I move.
I think you will like it.    Jerry

Jerry when will you be in Indiana? Is the ranch sold yet?

Paul Lamar
 
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