X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from elasmtp-dupuy.atl.sa.earthlink.net ([209.86.89.62] verified) by logan.com (CommuniGate Pro SMTP 6.0.4) with ESMTP id 6187945 for lml@lancaironline.net; Mon, 08 Apr 2013 10:16:10 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.62; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=OYG7kU4Eqb3PREhAVo7EkHFq8/bMmpvHqL7vj9YCnpDJj4QhohaTFU7QrQisFyAJ; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [72.92.131.242] (helo=[192.168.1.24]) by elasmtp-dupuy.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1UPCr9-0004b0-In for lml@lancaironline.net; Mon, 08 Apr 2013 10:15:35 -0400 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-285-576276953 Subject: Re: [LML] Fw: Static Wicks Date: Mon, 8 Apr 2013 10:15:33 -0400 In-Reply-To: To: "Lancair Mailing List" References: Message-Id: <8755D1E3-F173-40E1-8433-2FD156D1F226@earthlink.net> X-Mailer: Apple Mail (2.1085) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940a8a224073f361161fa1eb26a7ac4f370350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 72.92.131.242 --Apple-Mail-285-576276953 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 Fred, Wasn't sure how to read your last paragraph.=20 Does this mean static wicks are not required if you bond everything into = the battery? ...or that static wicks work better if you bond everything into the = battery? Colyn On Apr 8, 2013, at 6:24 AM, Frederick Moreno wrote: Static develops based on the impact of precip and ice crystals on the = front (forward facing surfaces) of the airplane, that is, what you see = if you stand way in front of the airplane and view it front on with a = telescope. This includes all the cowl, the front of the wings up to the = thickest point of the wings, windshield, etc. Behind the line where the = curvature of wing, tail, and such hide the surface from impacting = particles, static is not formed. The rudder is in this region. =20 The number of static wicks required it dissipate static is based on a = calculation of the frontal areas as described above (some percentage of = thewing area, for example, like 30-50%) and the speed of the aircraft.=20= =20 Normal Lancair procedure is to put static wicks on the trailing edge of = ailerons, elevators, rudder with number as calculated by the wick maker. = These must be connected to a conductive surface or wire, and this means = wires in the rudder. Ideally, all carbon surfaces are bonded together = with straps using conductive epoxy bonded to the bare carbon fibers = exposed by sanding, and wires that go from control surface in parallel = to the hinges so that there is a continuous electrical path to be = followed via wire (not hinge) in the event of a big discharge that may = pit a bearing. Anti static radome paint works on the fiberglass cowl = and vertical stabilizer carrying charge (letting it leak away) to the = carbon fiber or local ground and thence into the ships ground. =20 In the end, a group of us concluded that it was best to run 10 gage = ground wires to each corner of the airplane, bond all carbon surfaces to = this ground net (that means top and bottom skins, control surfaces, = etc.) and take the ground net to the main battery ground at the firewall = so that the battery serves as a pulse absorber which it does well. This = level of connective bonding has eliminated static discharge problems on = aircraft previously affected. =20 Fred Moreno =20 =20 =20 =20 -------Original Message------- =20 From: John Barrett Date: 7/04/2013 11:02:53 PM To: lml@lancaironline.net Subject: Static Wicks =20 This question has to do with the rudder in the IVP. It=92s written that = because the rudder is fiberglass, wicks aren=92t effective due to non = conductivity.=20 =20 A build shop installed wicks on my rudder and they ran ground wires to = those wicks from a/c ground. It seemed logical that this would make = them useful, but last night I had a discussion with Dan Newland who got = involved in static discharge problems on a satellite project in his = working days and he scratched his head at the notion. Said he wasn=92t = sure but would guess that the wicks are not going to be useful in that = configuration.=20 =20 Anyone on the LML have knowledge that bears on the subject? I would = like to learn more. =20 Thanks =20 John Barrett, CEO Leading Edge Composites PO Box 428 Port Hadlock, WA 98339 =20 www.carbinge.com =20 =20 --Apple-Mail-285-576276953 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 Fred,

Wasn't sure how to read = your last paragraph. 
Does this mean static wicks are not = required if you bond everything into the battery?
...or that = static wicks work better if you bond everything into the = battery?

Colyn

On Apr = 8, 2013, at 6:24 AM, Frederick Moreno wrote:

Static = develops based on the impact of precip and ice crystals on the front = (forward facing surfaces) of the airplane, that is, what you see if you = stand way in front of the airplane and view it front on with a = telescope.  This includes all the cowl, the front of the wings up = to the thickest point of the wings, windshield, etc.  = Behind the line where the curvature of wing, tail, and such = hide the surface from impacting particles, static is not formed.  = The rudder is in this region.
 
The number of = static wicks required it dissipate static is based on a calculation of = the frontal areas as described above (some percentage of thewing = area, for example, like 30-50%) and the speed of the = aircraft. 
 
Normal Lancair procedure is = to put static wicks on the trailing edge of ailerons, elevators, rudder = with number as calculated by the wick maker.  These must be = connected to a conductive surface or wire, and this means wires in the = rudder.  Ideally, all carbon surfaces are bonded together with = straps using conductive epoxy bonded to the bare carbon fibers exposed = by sanding, and wires that go from control surface in parallel to the = hinges so that there is a continuous electrical path to be followed via = wire (not hinge) in the event of a big discharge that may pit a = bearing.   Anti static radome paint works on the fiberglass = cowl and vertical stabilizer carrying charge (letting it leak away) to = the carbon fiber or local ground and thence into the ships = ground.
 
In the end, a group of us concluded = that it was best to run 10 gage ground wires to each corner of the = airplane, bond all carbon surfaces to this ground net (that means top = and bottom skins, control surfaces, etc.) and take the ground net to the = main battery ground at the firewall so that the battery serves as a = pulse absorber which it does well.  This level of connective = bonding has eliminated static discharge problems on aircraft previously = affected.
 
Fred = Moreno
 
 
 =
 
 John Barrett
Date: 7/04/2013 11:02:53 = PM
Subject: Static = Wicks
 

This question has to do with the rudder in the = IVP.  It=92s written that because the rudder is fiberglass, wicks = aren=92t effective due to non conductivity. 

 

A build = shop installed wicks on my rudder and they ran ground wires to those = wicks from a/c ground.  It seemed logical that this would make them = useful, but last night I had a discussion with Dan Newland who got = involved in static discharge problems on a satellite project in his = working days and he scratched his head at the notion.  Said he = wasn=92t sure but would guess that the wicks are not going to be useful = in that configuration. 

 

Anyone = on the LML have knowledge that bears on the subject?  I would like = to learn more.

 

Thanks

 

John = Barrett, CEO

Leading Edge = Composites

PO Box = 428

Port Hadlock, WA = 98339

 

www.carbinge.com

 

 
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= --Apple-Mail-285-576276953--