Bill, here is something that might work even better. Same size rad.
 16 by 22 by 2.5. The inlet scoop area is 15 by 5.

 Rotate it 90 degrees in the vertical axis and put the inlet duct
 on top. Use venetian blind cowl flaps on the bottom.
 When the flaps are open the back of the rad then becomes totally
 unobstructed. When closed of course you get external diffusion
 ahead of the scoop and the consequent streamlining.

 The inlet duct length gives room for a K&M style curve.
 A incidental advantage is it shields the rad from the exhaust heat
 radiation automatically. Should fit in the stock cowl.
 Although the bottom of the airplane is generally higher pressure
 the pressure is always lower behind a cowl flaps.

 Paul Lamar

Nice set of ducts, I'll take a look at the cowl next time I'm at the hanger.
I am still somewhat uncomfortable with the side exhaust with an unpressurized
airplane.  most homebuilts that I have flown in are drafty, including the KIS
due to a pretty small seal area on the door flange. I know the stream is
mixing with a lot of air, but having it go out the bottom seems better to me.
 I have determined that there is a real nice area for side cowl flaps for
exit air between the top and middle tripod tubes.

Bill Schertz
KIS Cruiser #4045

Well since the rad is enclosed and shielded  by the duct you can probably wiggle 
a couple of exhaust pipes back down and under along the left side of the 
nose gear behind the rad. I'll see if I can do it in 3D. I forgot.... 
are you doing a turbo or NA?

BTW the aero bending load on those venetian blind cowl flaps is considerable
so they should be carbon fiber on either side of 1/4 inch high density
foam or plywood.

Paul Lamar
 
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