I believe that was vortex generators, not difusers.

Finn

james coffman wrote:

Watch out for naca ducting for cooling. they have a
reputation for not working.  Having said that, look at
an article in this months Sport Aviation. I forgot the
plane type, but using the naca duct on an IO-540.  It
completely failed in several positions until he added
difusers (sp) in front. Now works fine. There are
pictures. Interesting! Jim Coffman 
--- "sqpilot@earthlink" <sqpilot@earthlink.net> wrote:
  

Message
  ----- Original Message ----- 
  From: Ed Anderson 
  To: Rotary motors in aircraft 
  Sent: Wednesday, November 19, 2003 7:16 PM
  Subject: [FlyRotary] Re: Core vs Radistor was Re:
[FlyRotary] radiator


  Boy, you catch me every time{:>)

  Thanks for the info Rusty

   Paul,

      I calculate out Rusty's radiator to have a
volume of 17.5*24.25*2.25 = 964 in^3.  Given that he
was running a turbo, he would naturally want/need
more cooling capacity than a NA block.  So his basic
radiator was approx 50% large in volume than two
cores.  Since he could produce up to that much
additional power with his turbo, it would appear
that his is sized about right - perhaps a bit on the
large size since he probably would not run under
high boost at cruise.  

  MESSAGE CUT TO SAVE DOWNLOAD TIME, ETC

    IBut, in any case, I think your currently
planned radiator size is undersized.  FWIW - always
keepin mind my knowledge of radiators and cooling is
quite limited.


  Ed

  Ed Anderson
  RV-6A N494BW Rotary Powered
  Matthews, NC
  eanderson@carolina.rr.com
    Your knowledge of radiators and cooling may be
limited....however, my knowledge of radiators and
cooling could be written on the head of a match.
Thanks for your valuable input, Ed.  I was trying to
come up with a radiator that could be placed
directly in front of the NACA duct, as Al Wick did. 
I will probably go with a larger radiator, EWP and
fan.   Thanks again.  Paul Conner

    

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