REFLECTOR: Fwd: My Velocity setup

Douglas Holub doug.holub at comcast.net
Fri Dec 3 11:19:22 CST 2004


Would it help to suck air through the NACA ducts if I put a fan on the prop extender just before it exits the cowl?

Doug Holub
  ----- Original Message ----- 
  From: Al Gietzen 
  To: 'Velocity Aircraft Owners and Builders list' 
  Sent: Friday, December 03, 2004 10:54 AM
  Subject: RE: REFLECTOR: Fwd: My Velocity setup


  My idea behind this is to scavange some of the flow that comes through the bottom radiator, across the bottom of the pan, and out the "suction slot".  at about 18" from the center of prop rotation, it should also add to the suction the prop places on the cowl opennings. Well.. at least that is my idea, we'll see if it works out. I am hoping that I can get away without an oil cooler with that setup. No worries though, I have a backup to put an inline cooler on the #2 NACA scoop if I need it. 



  Keep in mind that the reduced pressure ("suction") generated by the prop dissipates rapidly (exponentially) as you move away from the prop, so even a foot is a long way - and at cruise it is almost non-existent; you have to rely on dynamic pressure and whatever gradients are produced by the flow.  Remember, the air is standing still, the airplane is moving.  Some air is getting pushed/pulled downward by the airfoils, some is being pushed back by the prop, the rest is getting out of the way as best it can.



  Al



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