Return-Path: Sender: (Marvin Kaye) To: lml Date: Fri, 12 Jul 2002 08:12:32 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d02.mx.aol.com ([205.188.157.34] verified) by logan.com (CommuniGate Pro SMTP 4.0b4) with ESMTP id 1625856 for lml@lancaironline.net; Fri, 12 Jul 2002 01:48:51 -0400 Received: from Newlan2dl@aol.com by imo-d02.mx.aol.com (mail_out_v32.21.) id q.154.10ba510d (17229) for ; Fri, 12 Jul 2002 01:48:40 -0400 (EDT) From: Newlan2dl@aol.com X-Original-Message-ID: <154.10ba510d.2a5fc7b8@aol.com> X-Original-Date: Fri, 12 Jul 2002 01:48:40 EDT Subject: lead weights X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_154.10ba510d.2a5fc7b8_boundary" X-Mailer: AOL 7.0 for Windows US sub 10512 --part1_154.10ba510d.2a5fc7b8_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit I was wondiering if anyone has tried using a vacuum pump to provide pressure for clamping wing skins on to the spars. I know the traditional way is to put lead weights along the wing above the spar but vacuum can be a lot more even in distribution. The one BIG thing to watch is vacuum pressure since only a very small amount of vacuum would be required, (I know I'll hear some screaming on this!) Therefore a good vacuum gauge and valve would be required. I use vacuum frequently for composite construction of all sorts and once you get use to it, it's a really great way to build. For clamping, it's great! But a wing would have ribs and large unsupported areas that could break under excessive bending load. Like I say, it's a great way for some things, but I don't know if anyone has tried it for this sort of thing. Extraordinary care would be required. Dan Newland --part1_154.10ba510d.2a5fc7b8_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: 7bit I was wondiering if anyone has tried using a vacuum pump to provide pressure for clamping wing skins on to the spars.  I know the traditional way is to put lead weights along the wing above the spar but vacuum can be a lot more even in distribution.

The one BIG thing to watch is vacuum pressure since only a very small amount of vacuum would be required, (I know I'll hear some screaming on this!)  Therefore a good vacuum gauge and valve would be required.  I use vacuum frequently for composite construction of all sorts and once you get use to it, it's a really great way to build.  For clamping, it's great!  But a wing would have ribs and large unsupported areas that could break under excessive bending load.

Like I say, it's a great way for some things, but I don't know if anyone has tried it for this sort of thing.  Extraordinary care would be required.

Dan Newland

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