X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Thu, 13 Jul 2006 14:43:40 -0400 Message-ID: X-Original-Return-Path: Received: from [68.98.211.24] (HELO systems3.net) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1235296 for lml@lancaironline.net; Thu, 13 Jul 2006 11:03:01 -0400 Received-SPF: none receiver=logan.com; client-ip=68.98.211.24; envelope-from=cberland@systems3.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C6A68D.51E3F569" Subject: [LML] Leading edge pitting Content-class: urn:content-classes:message X-MimeOLE: Produced By Microsoft Exchange V6.5 X-Original-Date: Thu, 13 Jul 2006 08:02:11 -0700 X-Original-Message-ID: <87C33F695961494D886EB3B6C8A476510B87E3@s3server.Systems3.local> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Leading edge pitting Thread-Index: AcamjVGa7LpYvFt5RCSPff0w0efBKA== From: "Craig Berland" X-Original-To: "Lancair Mail List" This is a multi-part message in MIME format. ------_=_NextPart_001_01C6A68D.51E3F569 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Craig Gainza wrote: Unfortunately, I did not install static wicks from Napa to Sedona. I installed the wicks in Sedona and have not noticed any additional pitting since installing them. =20 My question to the listers: =20 1) Have any of you experienced similar pitting problems? 2) Is the 4-5 foot grounding strap too long? =20 3) Should the bottom skin be grounded as well? 4) Have I adequately dealt with this issue by installing the wicks? I am heading back to the paint shop on Friday and want to make sure I have resolved this issue. Any comments are greatly appreciated! =20 Craig, I have found carbon is very conductive but you have to sand down to carbon fibers. I would check the conductivity of every skin back to a common point. That is the wing top skin and the wing bottom skin, the horizontal top and the horizontal bottom, the fuselage top and bottom....you get the picture. I have been told a max of 10 ohms is acceptable. I would think if each skin is well bonded to all others, 10 ohms would be pretty easy to achieve. I have seen .03 ohm in a distance of 5 feet. Craig Berland ------_=_NextPart_001_01C6A68D.51E3F569 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Craig Gainza=20 wrote: Unfortunately, I did=20 not install static wicks from Napa to Sedona. I installed the = wicks in Sedona and have not noticed any additional pitting since=20 installing them.

My question to the listers: =

1) Have = any of you=20 experienced similar pitting problems?

2) Is the = 4-5 foot=20 grounding strap too long?

3) Should = the bottom=20 skin be grounded as well?

4) Have I = adequately=20 dealt with this issue by installing the wicks?

I am heading back to the paint shop on = Friday and=20 want to make sure I have resolved this issue. Any comments are = greatly=20 appreciated!

Craig, = I have found=20 carbon is very conductive but you have to sand down to carbon = fibers. I=20 would check the conductivity of every skin back to a common point. = That is=20 the wing top skin and the wing bottom skin, the horizontal top and the=20 horizontal bottom, the fuselage top and bottom....you get the = picture. I=20 have been told a max of 10 ohms is acceptable. I would think if = each skin=20 is well bonded to all others, 10 ohms would be pretty easy to = achieve. I=20 have seen .03 ohm in a distance of 5 feet.

Craig=20 Berland

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