X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost05.isp.att.net ([204.127.217.105] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2571858 for flyrotary@lancaironline.net; Sat, 08 Dec 2007 00:43:36 -0500 Received-SPF: pass receiver=logan.com; client-ip=204.127.217.105; envelope-from=bobperk90658@bellsouth.net Received: from fwebmail05.isp.att.net ([204.127.218.105]) by isp.att.net (frfwmhc05) with SMTP id <20071208054256H0500cumjde>; Sat, 8 Dec 2007 05:42:56 +0000 X-Originating-IP: [204.127.218.105] Received: from [74.249.251.67] by fwebmail05.isp.att.net; Sat, 08 Dec 2007 05:42:56 +0000 From: bobperk90658@bellsouth.net To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: circuit breakers Date: Sat, 08 Dec 2007 05:42:56 +0000 Message-Id: <120820070542.26236.475A2EE00005A6AD0000667C22230682229B0A02D2089B9A019C04040A0DBFC7059D0A9F0D010D@att.net> X-Mailer: AT&T Message Center Version 1 (Oct 30 2007) X-Authenticated-Sender: Ym9icGVyazlAYmVsbHNvdXRoLm5ldA== MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_26236_1197092576_0" --NextPart_Webmail_9m3u9jl4l_26236_1197092576_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Bobby, I know what you are talking about, long straight wirers make good antenna. DC produced by an alternator is not really DC, it all has ripples. Some more than others. Running twisted pairs would eliminate considering the wire the same as the source. Being able to remotely reset the system at the sources is looking better. I would guess that filtering out the EMI would throw another fly in the ointment, more weight, more expense and more to fail. Bob "I would think that a plastic plane with the positive cable in an isolated raceway would present itself as a good candidate for the first scenario" Bob, You should always run positive and negative wires in pairs and if possible twisted pairs. If twisted is not possible then the wires should lay side by side as much as possible. Isolating a large load cable is asking for EMI. Bobby --NextPart_Webmail_9m3u9jl4l_26236_1197092576_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

Bobby,

I know what you are talking about, long straight wirers make good antenna.  DC produced by an alternator is not really DC, it all has ripples. Some more than others.  Running twisted pairs would eliminate considering the wire the same as the source.  Being able to remotely reset the system at the sources is looking better.  I would guess that filtering out the EMI would throw another fly in the ointment,  more weight, more expense and more to fail.

 

Bob


 

"I would think that a plastic plane with the positive cable in an isolated raceway would present itself as a good candidate for the first scenario"
 
 
Bob,
 
You should always run positive and negative wires in pairs and if possible twisted pairs. If twisted is not possible then the wires should lay side by side as much as possible. Isolating a large load cable is asking for EMI.
 
Bobby

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