X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 08 Apr 2013 12:54:09 -0400 Message-ID: X-Original-Return-Path: <2thman1@gmail.com> Received: from mail-da0-f41.google.com ([209.85.210.41] verified) by logan.com (CommuniGate Pro SMTP 6.0.4) with ESMTPS id 6188260 for lml@lancaironline.net; Mon, 08 Apr 2013 12:02:37 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.210.41; envelope-from=2thman1@gmail.com Received: by mail-da0-f41.google.com with SMTP id w4so2700638dam.28 for ; Mon, 08 Apr 2013 09:02:01 -0700 (PDT) X-Received: by 10.66.234.198 with SMTP id ug6mr37989670pac.43.1365436920481; Mon, 08 Apr 2013 09:02:00 -0700 (PDT) X-Original-Return-Path: <2thman1@gmail.com> Received: from [10.0.0.118] ([24.113.36.130]) by mx.google.com with ESMTPS id yp2sm40780584pab.10.2013.04.08.09.01.58 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 08 Apr 2013 09:01:59 -0700 (PDT) References: In-Reply-To: Mime-Version: 1.0 (1.0) Content-Type: multipart/alternative; boundary=Apple-Mail-839EDC7F-9BBE-4B84-BFA9-1CFD01C99C8B X-Original-Message-Id: Content-Transfer-Encoding: 7bit X-Mailer: iPad Mail (10B329) From: John Barrett <2thman1@gmail.com> Subject: Re: [LML] Fw: Static Wicks X-Original-Date: Mon, 8 Apr 2013 09:01:57 -0700 X-Original-To: Lancair Mailing List --Apple-Mail-839EDC7F-9BBE-4B84-BFA9-1CFD01C99C8B Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable > So if the comment is true about the rudder not being a forward facing surf= ace, then why do you place static wicks on it? Sent from my iPad On Apr 8, 2013, at 3:24 AM, "Frederick Moreno" = wrote: >=20 > Static develops based on the impact of precip and ice crystals on the fron= t (forward facing surfaces) of the airplane, that is, what you see if you st= and way in front of the airplane and view it front on with a telescope. Thi= s includes all the cowl, the front of the wings up to the thickest point of t= he wings, windshield, etc. Behind the line where the curvature of wing, tai= l, 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 calc= ulation of the frontal areas as described above (some percentage of thewing a= rea, 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 ai= lerons, elevators, rudder with number as calculated by the wick maker. Thes= e 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 u= sing conductive epoxy bonded to the bare carbon fibers exposed by sanding, a= nd wires that go from control surface in parallel to the hinges so that ther= e 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 (letti= ng it leak away) to the carbon fiber or local ground and thence into the shi= ps 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 grou= nd net (that means top and bottom skins, control surfaces, etc.) and take th= e ground net to the main battery ground at the firewall so that the battery s= erves as a pulse absorber which it does well. This level of connective bond= ing 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=E2=80=99s written t= hat because the rudder is fiberglass, wicks aren=E2=80=99t effective due to n= on conductivity.=20 >=20 > =20 >=20 > A build shop installed wicks on my rudder and they ran ground wires to tho= se wicks from a/c ground. It seemed logical that this would make them usefu= l, but last night I had a discussion with Dan Newland who got involved in st= atic discharge problems on a satellite project in his working days and he sc= ratched his head at the notion. Said he wasn=E2=80=99t 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 t= o 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-839EDC7F-9BBE-4B84-BFA9-1CFD01C99C8B Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
= So if the comment is true about the rudder not being a forward facing surfac= e, then why do you place static wicks on it?
=

Sent from my iPad


On Apr 8, 20= 13, at 3:24 AM, "Frederick Moreno" <frederickmoreno@bigpond.com> wrote:

Static develops based on the impact of precip and ice crystals on the f= ront (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.&n= bsp; This includes all the cowl, the front of the wings up to the thickest p= oint of the wings, windshield, etc.  Behind the line where th= e curvature of wing, tail, and such hide the surface from impacting particle= s, static is not formed.  The rudder is in this region.  
 
The number of static wicks required it dissipate static is based on a c= alculation of the frontal areas as described above (some percentage of t= hewing area, for example, like 30-50%) and the speed of the aircraft.  <= /div>
 
Normal Lancair procedure is to put static wicks on the trailing edge of= ailerons, elevators, rudder with number as calculated by the wick maker.&nb= sp; These must be connected to a conductive surface or wire, and this means w= ires in the rudder.  Ideally, all carbon surfaces are bonded together w= ith straps using conductive epoxy bonded to the bare carbon fibers exposed b= y sanding, and wires that go from control surface in parallel to the hinges s= o that there is a continuous electrical path to be followed via wire (not hi= nge) in the event of a big discharge that may pit a bearing.   Ant= i static radome paint works on the fiberglass cowl and vertical stabilizer c= arrying charge (letting it leak away) to the carbon fiber or local ground&nb= sp;and thence into the ships ground.
 
In the end, a group of us concluded that it was best to run 10 gage gro= und wires to each corner of the airplane, bond all carbon surfaces to this g= round 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 batte= ry serves as a pulse absorber which it does well.  This level of connec= tive bonding has eliminated static discharge problems on aircraft previously= affected.
 
Fred Moreno
 
 
 
 
= -------Original Message-------
 
Date: 7/04/2013 11:= 02:53 PM
Subject: Static Wic= ks
 

This question has to do with the rudder in the IVP.&n= bsp; It=E2=80=99s written that because the rudder is fiberglass, wicks aren=E2= =80=99t effective due to non conductivity. 

 

A build shop installed wicks on my rudder and they ra= n ground wires to those wicks from a/c ground.  It seemed logical that t= his would make them useful, but last night I had a discussion with Dan Newla= nd who got involved in static discharge problems on a satellite project in h= is working days and he scratched his head at the notion.  Said he wasn=E2= =80=99t sure but would guess that the wicks are not going to be useful in th= at configuration. 

 

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

 

Thanks

 

John Barrett, CEO

Leading Edge Composites

PO Box 428

Port Hadlock, WA 98339

 

www.carbinge.com<= /a>

 

 
= --Apple-Mail-839EDC7F-9BBE-4B84-BFA9-1CFD01C99C8B--