X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 01 Dec 2008 18:21:05 -0500 Message-ID: X-Original-Return-Path: Received: from blu0-omc3-s5.blu0.hotmail.com ([65.55.116.80] verified) by logan.com (CommuniGate Pro SMTP 5.2.10) with ESMTP id 3323855 for lml@lancaironline.net; Sun, 30 Nov 2008 12:18:37 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.55.116.80; envelope-from=ian.crowe@sympatico.ca Received: from BLU0-SMTP28 ([65.55.116.73]) by blu0-omc3-s5.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Sun, 30 Nov 2008 09:18:01 -0800 X-Originating-IP: [74.15.61.192] X-Originating-Email: [ian.crowe@sympatico.ca] X-Original-Message-ID: X-Original-Return-Path: ian.crowe@sympatico.ca Received: from IanPC ([74.15.61.192]) by BLU0-SMTP28.blu0.hotmail.com over TLS secured channel with Microsoft SMTPSVC(6.0.3790.2668); Sun, 30 Nov 2008 09:18:00 -0800 From: "Ian Crowe" X-Original-To: "lancair Mailing List" Subject: Dynamic pressures X-Original-Date: Sun, 30 Nov 2008 09:17:51 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_015B_01C952CC.851BD6D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6000.16480 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16669 X-OriginalArrivalTime: 30 Nov 2008 17:18:00.0212 (UTC) FILETIME=[98556D40:01C9530F] This is a multi-part message in MIME format. ------=_NextPart_000_015B_01C952CC.851BD6D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable FYI the following are the dynamic pressures at various airspeeds. I = presume they are at standard atmospere. 100 knots 0.2351 psi 150 " 0.5290 " 200 " 0.9405 " These are derived from a formula q=3D0.5rho*v^2 where rho =3D 0.002377, = v =3Dft/sec, q=3D#sq ft If you look carefully I think it is in the = archives. If anyone wants the full table I could scan it and send it to the list. I tested my tanks for leaks with air at 1.5 psi 40" water and whilst = the pressure did vary with the atmospheric, making me think I had a leak = at one point, I saw no deformation of the skins at all. I would worry = if mouth pressure could distort my skins although I am not sure I know = what I would be worrying about. Ian B. Crowe LNC 2 C-FKRO ------=_NextPart_000_015B_01C952CC.851BD6D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

FYI the following are the dynamic = pressures at=20 various airspeeds. I presume they are at standard = atmospere.

100 knots 0.2351 = psi

150 =20 " 0.5290 = "

200 =20 " 0.9405 =20 "

These are derived from a formula = q=3D0.5rho*v^2 =20 where rho =3D 0.002377,

v =3Dft/sec, q=3D#sq ft If = you look=20 carefully I think it is in the archives.

If anyone wants the full table I could = scan it and=20 send it to the list.

I tested my tanks for leaks with air at = 1.5=20 psi 40" water and whilst the pressure did vary with the = atmospheric,=20 making me think I had a leak at one point, I saw no deformation of the = skins at=20 all. I would worry if mouth pressure could distort my skins = although I am=20 not sure I know what I would be worrying about.

Ian B. Crowe
LNC 2=20 C-FKRO

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