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

O.K.  that is better for me, too.  Using a 4 inch high constant area
duct, the louvers can fit  the normal  lower cowl bottom  line.

   In the photo, the board is set on the 12 inch spinner height.  It
appears that there will be room for the intake runners with the 12 inch
spinner. Between the 16 and 12 spinners, each has advantages and
disadvantages.  Using the twelve inch spinner, the cheek inlets which
are way too large for just the oil coolers can be divided so that some
of the air is diverted to the cool tube on one side and for ram air on
the other.  Using a 12 inch spinner allows use of the stock cowl with a
rad scoop added.  As you have said,  things can get  ugly at that
point.  Love to see how it would look in Rhino.         Jerry

I will see what I can do.

Paul Lamar
 
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