[NSRCA-discussion] Cooling inlet/out sizes???

[Bill Glaze]

Randy:
With the P & W  R-2800, T.O was with the cowl flaps in the 4 degree position- actually, in trail.  These were gradually set to keep the heads at a certain temp. for cruise.  Actually, they were closed, which gave much LESS of an exhaust opening, than the cowl intake.  As I recall, the Wright R-3350 was about the same.  BTW: With the cowl flaps in the full open, (ground) position, some airplanes wouldn't stay in the air, due to drag.  A Boeing 377 was put into SFO Bay one time when the engineer accidentally turned the cowl flap control knobs in the wrong direction, fully opening the cowl flaps.  I don't believe anyone lost their life.  
Bill Glaze
  ----- Original Message ----- 
  From: Randy hatfield 
  To: NSRCA Mailing List 
  Sent: Monday, February 13, 2006 2:20 PM
  Subject: Re: [NSRCA-discussion] Cooling inlet/out sizes???


  I heard 3 times the size of the inlet.

  Anyway, how did they do it wuith the P-47 and C-54?  Cowl Flaps or something like that so they could adjust the size of the outlet in flight.

  Randy
    ----- Original Message ----- 
    From: Bill Glaze 
    To: NSRCA Mailing List 
    Sent: Monday, February 13, 2006 12:48 PM
    Subject: Re: [NSRCA-discussion] Cooling inlet/out sizes???


    Makes for an interesting cowling if it's a scale radial engine; i.e. P-47, F8 Bearcat, Stearman, etc.
      ----- Original Message ----- 
      From: jivey61 at bellsouth.net 
      To: TJS at mail.global-electronics.com ; NSRCA Mailing List 
      Sent: Sunday, February 12, 2006 11:21 PM
      Subject: Re: [NSRCA-discussion] Cooling inlet/out sizes???


      Tim
       I think the rule of thumb...... exhaust should be 4 times the area of the intake. That also depends on the oat(temp) you fly in.

      Jim Ivey
        ----- Original Message ----- 
        From: Tim Of Global Electronics, Ltd. 
        To: NSRCA Mailing List 
        Sent: Sunday, February 12, 2006 11:03 PM
        Subject: [NSRCA-discussion] Cooling inlet/out sizes???


        Can anyone tell me which should  be larger, the colling air input or the exhaust output inside the cowl???

        Thanks
        tim 



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