X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Sender: To: lml Date: Thu, 01 Feb 2007 13:54:48 -0500 Message-ID: X-Original-Return-Path: Received: from smtp108.sbc.mail.mud.yahoo.com ([68.142.198.207] verified) by logan.com (CommuniGate Pro SMTP 5.1.5) with SMTP id 1804458 for lml@lancaironline.net; Thu, 01 Feb 2007 12:30:55 -0500 Received-SPF: none receiver=logan.com; client-ip=68.142.198.207; envelope-from=elippse@sbcglobal.net Received: (qmail 28691 invoked from network); 1 Feb 2007 17:30:07 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=sbcglobal.net; h=Received:X-YMail-OSG:Message-ID:From:To:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=OXybhn8anpNZb8XKqIgDZXTZARb1pM9wQVGSYZjq/bP6wmdL07oZZYZTay4PZX/Ris+NtN1NxSutrFli+ttDRWzXaoifeMxL6ZzcLkpG0Sdm8UBDAoDhpRXWIw8HqWAcaNLNJAmNS4WoETPqcmvmwqYJtUJ9+RkjC7YFGFNE3KM= ; Received: from unknown (HELO Computerroom) (elippse@sbcglobal.net@75.15.140.59 with login) by smtp108.sbc.mail.mud.yahoo.com with SMTP; 1 Feb 2007 17:30:07 -0000 X-YMail-OSG: mYpN3hkVM1l3jX_GHucuVfvFsqDCgn1EK6zSjGlq2l62dvjcFM_4maLZp9faIn75S6c22Oo.sPz23TRNoawBqA32fqRD X-Original-Message-ID: <000b01c74626$9ec17a90$3b8c0f4b@Computerroom> From: "Paul Lipps" X-Original-To: "Marv Kaye" Subject: Wing positive pressure X-Original-Date: Thu, 1 Feb 2007 09:30:05 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01C745E3.8EE789E0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C745E3.8EE789E0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable A strongly held concept is that the bottom of a wing has positive = pressure and the top of the wing has reduced pressure, and this is where = lift comes from. Any wing with curvature on the bottom, such as the NLF1 = 0215F on Lancair 235,320,360 has reduced pressure both on the top and on = the bottom; its just that the reduced pressure on top is lower than on = the bottom, so the there is a net upward force. Since lift is a force = due to a pressure difference across a surface, it may come as a shock to = most of you that the pressure difference is across the top skin and the = bottom skin. That's right, Ladies and germs, lift on a hollow wing is = due to the air inside pushing up on the top skin and pushing down on the = bottom skin, but the top skin wins, hopefully! Unless it's not attached = properly, as Steve Whitman found out. Suction is not a force; it's a = human's subjective misunderstanding of things physical, such as hot and = cold. Suction doesn't pull open a canopy in flight; the air in the = cockpit pushes it open. Did you know that there are hundreds of pounds = of pressure differential on your canopy which makes up a significant = part of your aircraft's overall lift force, and slowing down the plane = to close a half-latched canopy doesn't make the force go away? Please, = if you can't grasp or understand this apparently un-orthodox concept = that flies in the face of all you've been taught, lets not do an = aerodynamic battle on these posts! ------=_NextPart_000_0008_01C745E3.8EE789E0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
A strongly held concept is that the bottom of a = wing has=20 positive pressure and the top of the wing has reduced pressure, and this = is=20 where lift comes from. Any wing with curvature on the bottom, such as = the NLF1 0215F on Lancair 235,320,360 = has reduced=20 pressure both on the top and on the bottom; its just that the = reduced=20 pressure on top is lower than on the bottom, so the there is a net = upward force.=20 Since lift is a force due to a pressure difference across a = surface, it may=20 come as a shock to most of you that the pressure difference is across = the top=20 skin and the bottom skin. That's right, Ladies and germs, lift on a = hollow wing=20 is due to the air inside pushing up on = the top=20 skin and pushing down on the bottom skin, but the top skin wins, = hopefully!=20 Unless it's not attached properly, as Steve Whitman found out. Suction = is not a=20 force; it's a human's subjective misunderstanding of things physical, = such as=20 hot and cold. Suction doesn't pull open a canopy in flight; the air in = the=20 cockpit pushes it open. Did you know that there are hundreds of pounds = of=20 pressure differential on your canopy which makes up a significant part = of your=20 aircraft's overall lift force, and slowing down the plane to close a=20 half-latched canopy doesn't make the force go away? Please, if you = can't=20 grasp or understand this apparently un-orthodox concept that = flies in=20 the face of all you've been taught, lets not do an aerodynamic battle on = these=20 posts!
------=_NextPart_000_0008_01C745E3.8EE789E0--