X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 31 Jul 2008 15:21:33 -0400 Message-ID: X-Original-Return-Path: Received: from smtp115.sbc.mail.sp1.yahoo.com ([69.147.64.88] verified) by logan.com (CommuniGate Pro SMTP 5.2.5) with SMTP id 3047860 for lml@lancaironline.net; Wed, 30 Jul 2008 00:57:29 -0400 Received: (qmail 67402 invoked from network); 30 Jul 2008 04:57:29 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=sbcglobal.net; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=xg78MB+sZwqVI3uGy3oQaLIqzwBqzlWzRZcsbiNgoCm8SZaEOSpRVaGUS1l7MwGpCu+NlGzAtRl7rVfCagDJyL66nQ2wpgOWVs+9o1awuVIWZ3okMspta5X1GST6vVwpMWB8dFPMOzuU2XCXbJ5YWzsTGbhgGGSH0lp/QjhToFo= ; Received: from unknown (HELO Computerroom) (elippse@sbcglobal.net@75.15.140.132 with login) by smtp115.sbc.mail.sp1.yahoo.com with SMTP; 30 Jul 2008 04:57:29 -0000 X-YMail-OSG: yXr8fTQVM1nqNo6w2TFIsNxAzwYuLRMXwteh07_UqM9fl7Nu6pztQ.gPA6YOot86NeOQm1IFHPdw7KSocqSPvS7J86ZmPsyGPsXmDlA0Sw-- X-Yahoo-Newman-Property: ymail-3 X-Original-Message-ID: <000201c8f200$c6eaaf50$848c0f4b@Computerroom> From: "Paul Lipps" X-Original-To: "Marv Kaye" Subject: Gear-door air leaks X-Original-Date: Tue, 29 Jul 2008 16:11:59 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C8F195.D42F2620" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C8F195.D42F2620 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable You've been taught that there is high pressure on the bottom of the = wing, well, that's just not so! Yes, the pressure on the bottom of the = wing is lower than on the top when lift is being developed with the = plane not inverted. But, with our airfoils that have curvature on the = bottom as well as on the top, the pressure on the bottom of the wing is = below static. What that means is if the interior of the wing is vented = to the cabin or other source of near-static pressure, there may exist a = flow from the inside of the wing through any un-sealed gaps around the = landing gear doors. Typically, that flow will exit perpendicularly to = the flow on the surface, just as in the gaps on the control surfaces, = making drag. Have any of you tried to put some sealing foam around the = cutouts to prevent this? ------=_NextPart_000_0005_01C8F195.D42F2620 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
You've been taught that there is high pressure = on the=20 bottom of the wing, well, that's just not so! Yes, the=20 pressure on the bottom of the wing is lower than on the top when lift is = being=20 developed with the plane not inverted. But, with our airfoils that have=20 curvature on the bottom as well as on the top, the pressure on the = bottom of the=20 wing is below static. What that means is if the interior of the wing is = vented=20 to the cabin or other source of near-static pressure, there may exist a = flow=20 from the inside of the wing through any un-sealed gaps around the = landing gear=20 doors. Typically, that flow will exit perpendicularly to the flow on the = surface, just as in the gaps on the control surfaces, making drag. Have = any of=20 you tried to put some sealing foam around the cutouts to prevent=20 this?
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