Jerry Hey wrote:

Paul,  in drawing wedge portion  of the rad air intake plenum that is
directly over the core, I have always started with an opening that
was the same as the core thickness, 2.5 inches,  tapering back to
near zero.  This was arbitrary and I had no real reason to do it that
way.  Is there an optimum wedge angle?  Does it have anything to do
with core thickness?    Would the  plenum work well if the opening
were reduced from 2.5 to 2 inches or even one inch?    Jerry

No. The area of that opening must be 25% to 30% of the core area.
Let's say your core is 16 by 20 that is 320 square inches.
Your opening needs to be 80 square inches minimum.
Since the opening is 16 inches wide it must be at least
5 inches high. The angle is what ever it comes out with
a 5 by 16 opening. If you mount the rad sideways it need only
be 80/20 or four inches high. 

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2002 All world wide rights reserved.