X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-iy0-f180.google.com ([209.85.210.180] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTPS id 5046813 for flyrotary@lancaironline.net; Sat, 09 Jul 2011 09:28:57 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.210.180; envelope-from=rwstracy@gmail.com Received: by iyh42 with SMTP id 42so4020349iyh.25 for ; Sat, 09 Jul 2011 06:28:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=subject:references:from:content-type:x-mailer:in-reply-to :message-id:date:to:content-transfer-encoding:mime-version; bh=2Elp72BOOhD0gmTIgZlbpl5TtKwxz5ko3JBfKxO/S+c=; b=l7PJmVpbbM4rmwfYEiUoEOlj+qLGIbAJsVeEiOfLtJSfcsOIjnNapliBprJPtGL6WP CHy+cbezf4npT9jN6IzjvEBnGEgjV8pCGRSlpxaBL8UM/2BhVl+JIjFfzTk24SyHoufM rqPe/Gp1w5Vj1RIf3vieJNsyI0KdzJE8201H4= Received: by 10.231.158.197 with SMTP id g5mr2725714ibx.52.1310218102836; Sat, 09 Jul 2011 06:28:22 -0700 (PDT) Return-Path: Received: from [10.0.1.3] (99-197-145-127.cust.wildblue.net [99.197.145.127]) by mx.google.com with ESMTPS id x13sm6591891ibh.16.2011.07.09.06.28.16 (version=TLSv1/SSLv3 cipher=OTHER); Sat, 09 Jul 2011 06:28:22 -0700 (PDT) Subject: Re: [FlyRotary] Re: sheilded plug wires References: From: Tracy Content-Type: multipart/alternative; boundary=Apple-Mail-5--949068983 X-Mailer: iPad Mail (8F191) In-Reply-To: Message-Id: <452F310D-23A0-4A70-898F-1FD12C5CB701@gmail.com> Date: Sat, 9 Jul 2011 09:28:03 -0400 To: Rotary motors in aircraft Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (iPad Mail 8F191) --Apple-Mail-5--949068983 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii In this case "shielded" is the wrong term. The spiral wire does not actual= ly shield the noise, it prevents the noise from being transmitted. It act= s as an inductor to prevent the propagation of the noise generated at the sp= ark gap from propagating up the wire. Tracy Sent from my iPad On Jul 9, 2011, at 2:09 AM, Lehanover@aol.com wrote: > It has to do with the resistance of the long thin Monel wire. An impedance= mismatch and inductive reactance. What the mechanism is I do not know. That= is why Tracy is here, to explain such matters. > =20 > Lynn E. Hanover > =20 > In a message dated 7/8/2011 11:08:09 P.M. Paraguay Standard Time, SBoese@u= wyo.edu writes: > My last massage got a little garbled, the way I have my wires configured n= ow, the conductor and spiral wrap are exposed and folded under the crimped t= eminal ends, so aren't both the conductor and the spiral wrap acting as a co= nductor? What is doing the shielding? > =20 > Brian Trubee --Apple-Mail-5--949068983 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=utf-8
In this case "shielded" is the wrong term.   The spiral wire does not actually shield the noise, it prevents the noise from being transmitted.    It acts as an inductor to prevent the propagation of the noise generated at the spark gap from propagating up the wire.

Tracy

Sent from my iPad

On Jul 9, 2011, at 2:09 AM, Lehanover@aol.com wrote:

It has to do with the resistance of the long thin Monel wire. An impedance mismatch and inductive reactance. What the mechanism is I do not know. That is why Tracy is here, to explain such matters.
 
Lynn E. Hanover
 
In a message dated 7/8/2011 11:08:09 P.M. Paraguay Standard Time, SBoese@uwyo.edu writes:
My last massage got a little garbled, the way I have my wires configured now, the conductor and spiral wrap are exposed and folded under the crimped teminal ends, so aren't both the conductor and the spiral wrap acting as a conductor? What is doing the shielding?
 
Brian Trubee
--Apple-Mail-5--949068983--