X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 09 Apr 2013 10:47:45 -0400 Message-ID: X-Original-Return-Path: Received: from nm1.bullet.mail.bf1.yahoo.com ([98.139.212.160] verified) by logan.com (CommuniGate Pro SMTP 6.0.4) with SMTP id 6189305 for lml@lancaironline.net; Mon, 08 Apr 2013 23:06:50 -0400 Received-SPF: none receiver=logan.com; client-ip=98.139.212.160; envelope-from=kyrilian_av@yahoo.com Received: from [98.139.212.149] by nm1.bullet.mail.bf1.yahoo.com with NNFMP; 09 Apr 2013 03:06:13 -0000 Received: from [98.139.173.165] by tm6.bullet.mail.bf1.yahoo.com with NNFMP; 09 Apr 2013 03:06:13 -0000 Received: from [127.0.0.1] by smtp108-mob.biz.mail.bf1.yahoo.com with NNFMP; 09 Apr 2013 03:06:13 -0000 X-Yahoo-Newman-Id: 483802.54822.bm@smtp108-mob.biz.mail.bf1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: wYOGGaEVM1lmqhrhMABLoajrctGlcQM_jePnDYFW2ZGEzVy cGBbU8MyTngdECEW_2AQVYiSg_EqWNdETUo3Jj.ZxMLeSQncmuGHeDeOmMy1 vv6kYOUVi23XAlENk093ymvz5ZuQZUFt1FZkt33uGUQBznsCKIDSjkxgvHla Ybyk8sEXIRoBJNHAHZoz.ofCrGKFwMhGigWOY_wwYIyK7aTMsleFwcq4UffB FVe3dt3xzk0vdBbF.R5Hh2dQY0D7TaMq2dan0XP1E4IRAy9Rk5DikZHeDRMr 0KQSe7V89oIjyCKU2cd4rqOhMuLN9m4jPNhpZ5K5WU4AGY6FbAhw5Wjg.vgc W8I6WSel3m_Al.WSLuJSS5aPmEclo17fF.3942aXonssZHyJ8w0C3RtMrOH9 UNDw0zKh7Kc5js572VaNM0NrRDeZ6K4PxEkRAM4mg3Nadp2ti2DLczCLpYLf q7gyUDK1vAc91T7GeqIUVKQOqvP6lnx3jpFSngHbeeGgH.tSZv3cPKmxya5A QtiWgJBcIiZPfJB0DZsTKdMK5xOE7NgT6t1Y2bsNartSeLc.g2Xj5.CZ07f7 JMQ-- X-Yahoo-SMTP: mQCJX7qswBDY8ocVKU5pgYmL3O_ezrCW X-Rocket-Received: from [192.168.1.72] (kyrilian_av@107.204.97.190 with xymcookie) by smtp108-mob.biz.mail.bf1.yahoo.com with SMTP; 08 Apr 2013 20:06:13 -0700 PDT Subject: Re: [LML] Fw: Static Wicks References: From: Kyrilian Dyer Content-Type: multipart/alternative; boundary=Apple-Mail-1811F9FC-1961-4806-91F4-135871828F3E X-Mailer: iPad Mail (10B146) In-Reply-To: X-Original-Message-Id: <0C7B53FF-C343-44DD-9F8A-0F1D47630FB6@yahoo.com> X-Original-Date: Mon, 8 Apr 2013 23:06:12 -0400 X-Original-To: Lancair Mailing List , Frederick Moreno Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-1811F9FC-1961-4806-91F4-135871828F3E Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Fred, Does this imply that wicks are not required? I would think that you'd need s= ome way to discharge the overall charge of the aircraft relative to the loca= l atmosphere. If so, how many are required? If they're all wired together t= hen does it matter where they are (wing tips, elevator tips, rudder tip)? On a related note, are you familiar with the innards of typical GA style wic= ks? Could one home-build them? They look like a bunch of carbon fibers bou= nd with heat shrink, though I'm sure emulating the conductivity isn't trivia= l. Cheers, - Kyrilian L2K-236 Sent from my iPad On Apr 8, 2013, at 6:24 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 > 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-1811F9FC-1961-4806-91F4-135871828F3E Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Fred,

=
Does this imply that wicks ar= e not required?  I would think that you'd need some way to discharge th= e overall charge of the aircraft relative to the local atmosphere.  If s= o, how many are required?  If they're all wired together then does it m= atter where they are (wing tips, elevator tips, rudder tip)?

On a related note, are you familiar with the innards of typ= ical GA style wicks?  Could one home-build them?  They look like a= bunch of carbon fibers bound with heat shrink, though I'm sure emulating th= e conductivity isn't trivial.

 Cheers,<= /div>
- Kyrilian
L2K-236


Sent from my iPad

On Apr 8= , 2013, at 6:24 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-1811F9FC-1961-4806-91F4-135871828F3E--