Jerry Hey wrote:

Paul,  I have been trying to come to some finality on the radiator
plenum.   I reversed  your process and started out with physical model
of poster paper and plywood and then as I encountered problems, tried
to work it out with cad.  Anyway,  here is what I have come up with.
Please take it into consideration with the cowl designs.

     The cowl should slope back from under the spinner to a point 5/8"
below the rear lower corner of the radiator header tank.  From there
the louvers take over and it will flat and horizontal back to the
firewall.  The flat bottom needs to be 14.5 inches wide to allow room
for the louvers.

The photo was taken before I put the extension on the plenum to get it
out the front of the cowl. In the photo, the plywood represents the
radiator and the duct tape is the header tanks.  The plenum opening is
48 sq in which expands to 71.5 sq. in.  before it enters the wedge
portion.   Jerry

Don't need to do that. Keep a constant AREA duct up to the start of the core.

Paul Lamar
 
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