> 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



Its a Catto, 64x78 with the RD1B gear box.