X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 50 [XX] Return-Path: Sender: To: lml Date: Sat, 03 Feb 2007 00:39:19 -0500 Message-ID: X-Original-Return-Path: Received: from vms042pub.verizon.net ([206.46.252.42] verified) by logan.com (CommuniGate Pro SMTP 5.1.5) with ESMTP id 1808090 for lml@lancaironline.net; Sat, 03 Feb 2007 00:30:00 -0500 Received: from jacky0da39824a ([71.111.116.86]) by vms042.mailsrvcs.net (Sun Java System Messaging Server 6.2-6.01 (built Apr 3 2006)) with ESMTPA id <0JCV00DSNGLNJVI2@vms042.mailsrvcs.net> for lml@lancaironline.net; Fri, 02 Feb 2007 23:29:50 -0600 (CST) X-Original-Date: Fri, 02 Feb 2007 21:29:46 -0800 From: "Tom Gourley" Subject: Re: [LML] Re: Wing positive pressure X-Original-To: "Lancair Mailing List" Reply-to: "Tom Gourley" X-Original-Message-id: <000901c74754$51a018a0$650610ac@jacky0da39824a> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Mailer: Microsoft Outlook Express 6.00.2900.3028 Content-type: text/plain; format=flowed; charset=iso-8859-1; reply-type=original Content-transfer-encoding: 7bit X-Priority: 3 X-MSMail-priority: Normal References: "All Paul is saying is that to view lower pressure on the top surface of the upper wing skin as *PULLING UP* on the wing is wrong. It's more accurate to say the higher pressure air inside the wing is *PUSHING UP* on it (the upper wing skin) as regards the forces necessary to fly. The air inside the wing has nothing to do with lift. There are wings out there that have foam cores with no air inside. If there is air inside the wing, and assuming it's at a higher pressure than outside, it's pushing evenly on all internal wing surfaces. If it were true that higher pressure inside the wing pushes the wing up I should be able to stand inside a box and cause it to levitate by pushing against the top from the inside! I recommend reading the discussion at: http://en.wikipedia.org/wiki/Lift_(force) Note that there is no mention of what is inside the wing. Tom Gourley