X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mtiwmhc13.worldnet.att.net ([204.127.131.117] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2202530 for flyrotary@lancaironline.net; Fri, 27 Jul 2007 11:01:29 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.131.117; envelope-from=keltro@att.net Received: from mwebmail09.att.net ([204.127.135.30]) by worldnet.att.net (mtiwmhc13) with SMTP id <200707271500521130089u5je>; Fri, 27 Jul 2007 15:00:52 +0000 Received: from [64.250.200.25] by mwebmail09.att.net; Fri, 27 Jul 2007 15:00:52 +0000 From: keltro@att.net (Kelly Troyer) To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Oil cooler inlet - what next? Date: Fri, 27 Jul 2007 15:00:52 +0000 Message-Id: <072720071500.25186.46AA08A00000338B000062622160376021019D9B040A05@att.net> X-Mailer: AT&T Message Center Version 1 (Mar 24 2007) X-Authenticated-Sender: a2VsdHJvQGF0dC5uZXQ= MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_25186_1185548452_0" --NextPart_Webmail_9m3u9jl4l_25186_1185548452_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Al, My suggestion was to extend the entrance edge of the baffles forward and and below the wing perhaps an inch into the airstream and hopefully below the boundry layer......To do so might also require the the entry edge of the scoop to be extended and a larger radius added to properly capture the air. Kelly Troyer Kelly wrote: Uneducated guess but I will vote for a boundry layer problem......How about extending the baffle below the bottom of the wing an inch or two and retest.......It will be dirty and draggy but if that helps delta T it can be cleaned up with a proper installation......IMHO That’s an educated guess, or better yet, a fact – that it is A problem. But I’m still thinking it is not THE problem since there is 9.5” H2O dynamic pressure 12 – 5/8” off the surface, which is in the BL, and should represent something like the average velocity into the 1 ¼” opening of the scoop. Not sure what you mean extending the baffle below the bottom of the wing an inch or two? Do you mean opening the scoop up wider? I think making a larger radius on the entry edge of the scoop could help, and would give an indication whether opening the scoop more would help. Al, --NextPart_Webmail_9m3u9jl4l_25186_1185548452_0 Content-Type: text/html Content-Transfer-Encoding: 8bit
 Al,
  My suggestion was to extend the entrance edge of the baffles forward and
 and below the wing perhaps an inch into the airstream and hopefully below
 the boundry layer......To do so might also require the the entry edge of the
 scoop to be extended and a larger radius added to properly capture the air.
 
Kelly Troyer
 

 

Kelly wrote:

Uneducated guess but I will vote for a boundry layer problem......How about extending

the baffle below the bottom of the wing an inch or two and retest.......It will be dirty and

draggy but if that helps delta T it can be cleaned up with a proper installation......IMHO

 

That’s an educated guess, or better yet, a fact – that it is A problem. But I’m still thinking it is not THE problem since there is 9.5” H2O dynamic pressure 12 – 5/8” off the surface, which is in the BL, and should represent something like the average velocity into the 1 ¼” opening of the scoop. Not sure what you mean extending the baffle below the bottom of the wing an inch or two? Do you mean opening the scoop up wider? I think making a larger radius on the entry edge of the scoop could help, and would give an indication whether opening the scoop more would help.

 

Al,

 

  

 

 

 

 

 

 

 

 

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