X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from elasmtp-banded.atl.sa.earthlink.net ([209.86.89.70] verified) by logan.com (CommuniGate Pro SMTP 6.0.4) with ESMTP id 6188591 for lml@lancaironline.net; Mon, 08 Apr 2013 13:47:39 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.70; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=JMB4CMqjjEshZa0wQPjqgCZ+J+XzQDJEPFvM2Ui71TLRz56qRMh1GI6EHd+7YmKq; 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-banded.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1UPG9n-0005b8-R9 for lml@lancaironline.net; Mon, 08 Apr 2013 13:47:04 -0400 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-292-588966933 Subject: Re: [LML] Re: Fw: Static Wicks Date: Mon, 8 Apr 2013 13:47:03 -0400 In-Reply-To: To: "Lancair Mailing List" References: Message-Id: <4668824C-303F-4261-A118-E6D69DFD365F@earthlink.net> X-Mailer: Apple Mail (2.1085) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940f3b4a3efd28954ebaa6d069727e30ab0350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 72.92.131.242 --Apple-Mail-292-588966933 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 The vstab is the forward facing surface. The question is how to get the charge off the vstab, the rudder being = the nearest trailing edge. On Apr 8, 2013, at 12:54 PM, John Barrett wrote: > So if the comment is true about the rudder not being a forward facing = surface, then why do you place static wicks on it? Sent from my iPad On Apr 8, 2013, at 3:24 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 > =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 > =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 > =20 >=20 > Anyone on the LML have knowledge that bears on the subject? I would = like to learn more. >=20 > =20 >=20 > Thanks >=20 > =20 >=20 > John Barrett, CEO >=20 > Leading Edge Composites >=20 > PO Box 428 >=20 > Port Hadlock, WA 98339 >=20 > =20 >=20 > www.carbinge.com >=20 > =20 >=20 > =20 --Apple-Mail-292-588966933 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 The = vstab is the forward facing surface.
The question is how to get the = charge off the vstab, the rudder being the nearest trailing = edge.

On Apr 8, 2013, at 12:54 PM, John Barrett = wrote:

So if the comment = is true about the rudder not being a forward facing surface, then why do = you place static wicks on = it?

Sent from my = iPad


On Apr 8, 2013, at 3:24 AM, "Frederick = Moreno" <frederickmoreno@bigpond.com> 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
 
 
 
 
-------Original = Message-------
 
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

 

 

= --Apple-Mail-292-588966933--