Paul wrote:

Many thanks to Paul Lamar, Kent Russell and Matt for their suggestions on possible improvements to my cooling system for my rotary powered SQ2000.  I just finished the majority of the
mods/improvements. Here are a few pictures. The picture labeled "Aluminum extension added" and the picture labeled "aluminum extension" show the new extension from two different angles. The picture
labeled "lip extending into duct" is a real embarrassment to me. The firewall lip extended past the upper "floor" of the NACA duct, obviously tripping and interfering with proper airflow. Can't
believe I let that one get by.  (Don't have to be an engineer to recognize that warning flag). I'll pretend it was a Monday when I did that one.
     The picture labeled "part of lip removed" and "part of lip removed-bottom" are two views showing how I removed that nasty lip and created a radius in it's place. The final picture labeled
"finished radius and aluminum extension" shows the final configuration. I still need to drill 6 holes and install blind nuts to secure the extension to the existing plenum, then a little silicone
and test flight.   Hopefully, I will be able to report improved cooling efficiency on the next flight.
     Thanks again for taking the time to submit your improvement suggestions. I really DO listen sometimes. (My wife calls it selective listening). If anyone sees any red flags, please advise before
I secure the unit with screws and silicone tomorrow and fly it.  sincerely,  Paul Conner

You will have to fasten that plate to the bottom of the rad somehow  Paul.
Either that or stiffen up the back edge. The aluminum will deflect  downward 
and leak air if it builds the desired pressure. Perhaps you
can seal it with RTV and pop rivet it to the rad.

I am not sure what the last two pictures show.

I just watched the Weather Channel. I see you are in a record cold snap down
there in Alabama.


Paul Lamar
 
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