X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ispmxmta09-srv.windstream.net ([166.102.165.170] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2190508 for flyrotary@lancaironline.net; Fri, 20 Jul 2007 23:37:16 -0400 Received-SPF: pass receiver=logan.com; client-ip=166.102.165.170; envelope-from=montyr2157@alltel.net Received: from ispmxaamta08-gx.windstream.net ([71.29.244.202]) by ispmxmta09-srv.windstream.net with ESMTP id <20070721033637.PVQQ3155.ispmxmta09-srv.windstream.net@ispmxaamta08-gx.windstream.net> for ; Fri, 20 Jul 2007 22:36:37 -0500 Received: from Thorstwin ([71.29.244.202]) by ispmxaamta08-gx.windstream.net with SMTP id <20070721033637.WIHM16279.ispmxaamta08-gx.windstream.net@Thorstwin> for ; Fri, 20 Jul 2007 22:36:37 -0500 Message-ID: <001701c7cb48$5db538f0$6501a8c0@Thorstwin> From: "M Roberts" To: "Rotary motors in aircraft" Subject: Oil cooler inlet Date: Fri, 20 Jul 2007 22:36:47 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0014_01C7CB1E.74BDC640" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_0014_01C7CB1E.74BDC640 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Al, I'm in agreement with TJ on this one. Tuft test is definitely in order. = I did not realize that the gear door and wheel fairing were where they = are. Even if the transition is fairly smooth, the opening at the wheel = and the gaps in the door are going to make a mess in the area aft of the = door. Think little jets of air from all the gaps. This will trip the = boundary layer and make it much thicker than normal. It would have to be = fully sealed (air tight) around the gear door to stop this. Any high pressure that the open wheel well develops will squirt out = around the door.=20 I would test to see how bad the flow is loused up around the gear door = with some oil or tufts. You may find that sealing the fairing up = improves things a lot. Sealing the gap around the cooler certainly can't hurt things. Interested to see how the VG's and gap seal improve things. Armchair QB in action here ;-) Monty ------=_NextPart_000_0014_01C7CB1E.74BDC640 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Al,
 
I'm in agreement with TJ on this one. = Tuft test is=20 definitely in order. I did not realize that the gear door and wheel = fairing were=20 where they are. Even if the transition is fairly smooth, the opening at = the=20 wheel and the gaps in the door are going to make a mess in the area aft = of the=20 door. Think little jets of air from all the gaps. This will trip the = boundary=20 layer and make it much thicker than normal. It would have to be = fully=20 sealed (air tight) around the gear door to stop this.
 
Any high pressure that the open wheel = well develops=20 will squirt out around the door.
 
I would test to see how bad the flow is = loused up=20 around the gear door with some oil or tufts. You may find that = sealing the=20 fairing up improves things a lot.
 
Sealing the gap around the cooler = certainly can't=20 hurt things.
 
Interested to see how the VG's and gap = seal improve=20 things.
 
Armchair QB in action here = ;-)
 
Monty
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