Paul,
Sorry it took so long to take these pics - but here are the long
requested pics of my latest iteration without the cowl in place.  The
wedge diffuser is working great.  Cooling is now a non-issue.  It is a
lot more fun to now work at the problem from the other side...  small
changes to improve cooling drag rather than small changes to improve
cooling....  though overall progress may be somewhat slower.

I still find that the cowl flap has very little authority to control the
temps despite almost 100 sq in. of area that it can control. (only now
they are slightly too cool instead of too warm.

-- 
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net

The cowl may not be sealed well enough. For a flap to work well it must
draw air through only the heat exchangers. If there are leaks, or worse
a hole facing forward where dynamic pressure can fill the cowl with air
pressure, the  flaps won't do the job of controlling the coolant temperatures.


Paul Lamar ...No rotor no motor.

Very nice Dave, what prop is that on there ?

John


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