Thoughts about air scoops.

[Del Rykert]

The best rule of thumb to use for adequate cooling inside a cowled ingine is if you are truly moving the air over the hot parts of the engine the exit opening should be twice the squares of the intakes.

     Del K. Rykert
     AMA - 8928 
     NSRCA - 473
     Kb2joi - General 


  ----- Original Message ----- 
  From: Adam Quennoz 
  To: Pattern List 
  Sent: Tuesday, February 04, 2003 5:34 PM
  Subject: Thoughts about air scoops.



  It seems the trend these days are air scoops.  Before a scoop is effective, the area of the air exit must equal or exceed that of the air intake thus allowing a positve air flow to occur.  With all the scoops people are putting on the nose of the aircraft, there must be a pretty good sized hole somewhere for the air to escape.  There are cheek scoops, chin scoops and now with the concern of cooling the crank cases, there are scoops above the engine compartment.  I call them "nose scoops".  

  Has anyone thought of making EXITS on the top of the nose above the engine, and/or exits on the cheeks?  Basically put the scoops on backwards.  The air flowing over the backward facing scoop would actually create lower pressure inside the engine compartment allowing a larger volume of air to enter the chin scoop.  The air entering the chin scoop can flow all around the engine as it makes way to the exits of the engine compartment, and what's left can flow down the pipe tunnel.  

  I'd like to hear what others have to say about this idea.  I'm thinking of trying it on my pattern plane.

  Regards,
  Adam Quennoz
  AMA 383866
  IMAC 2439
  NSRCA 3546
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