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

[Ed Alt]

Tim:
Good question - I don't know for sure what the best inlet size is.  I always made an approximation that has about 2/3 to 3/4 the area of the cylinder behind the intake, then I apply the 2.5 or greater rule of thumb for the outlet area.  BTW, that is 2.5 x the total intake, so if you have something taking in air for colling the crankcase, add that in too.  Not sure if this is optimal or not, but it has worked for me so far.

Ed
  ----- Original Message ----- 
  From: Tim Of Global Electronics, Ltd. 
  To: NSRCA Mailing List 
  Sent: Monday, February 13, 2006 12:59 AM
  Subject: Re: [NSRCA-discussion] Cooling inlet/out sizes???


  Thanks All!

  But how do I calculate the minimum input size?

  Tim



  jivey61 at bellsouth.net wrote:

    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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