X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from ms-smtp-05.southeast.rr.com ([24.25.9.104] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 1962000 for flyrotary@lancaironline.net; Mon, 02 Apr 2007 08:08:35 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.104; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-05.southeast.rr.com (8.13.6/8.13.6) with SMTP id l32C7f0c004359 for ; Mon, 2 Apr 2007 08:07:42 -0400 (EDT) Message-ID: <000701c7751f$a9e96630$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: blued terminals radio noise was Re: Uneventful flight Date: Mon, 2 Apr 2007 08:08:45 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine Great to hear of an uneventful flight - all should be that way. Regarding the electrical wiring - when you have a "loose" connection with perhaps only a few strands of wire actually connected and other strands sometimes making connection, both conditions could exist. As Dale indicated "blued" metal is an indication of high temperature caused by more current flowing through the few remaining connections (higher resistance = more power dissipated). When some of the remaining loose strands make and break connections current will flow intermittently through these strands as they make contact and sparks will occur as these loose strand connections are made and broken due to the flexing. This of course was the same concept used by the first radio transmitters which were simply spark generators used to generate a very wide spectrum of electromagnetic "noise" - some of which was in the radio spectrum. I've actually used a spark transmitter (for a short period) - back in my early, early youth before being discovered and informed by the FCC that such devices were illegal due to the wide spectrum of radio noise and interference they generate. FWIW Ed ----- Original Message ----- From: "Bulent Aliev" To: "Rotary motors in aircraft" Sent: Monday, April 02, 2007 6:26 AM Subject: [FlyRotary] Re: Uneventful flight > > On Apr 2, 2007, at 12:12 AM, Dale Rogers wrote: > >> Bulent Aliev wrote: >>> crimp connector splice that was done by my electronics engineer >>> neighbor, totally loose. The metal part inside was blue from heat >>> (created from the sparking I guess?). So I had it fixed. The noise is >>> gone and me and my flight captain are happy. >> >> Hi All, >> >> Arcing should be black pits, not a blued pin or socket. When a >> connector is loose, it only makes contact on a very small portion of >> the available contact surface, forcing all the current to go through >> a very small point-of-contact. This is the same as trying to push 20 >> Amps through a #18 wire. It is called a high resistance connection. >> What happens when current is pushed through an resistive object? >> Heat is generated. Enough to turn the pin blue. >> >> Dale R >> COZY MkIV #1254 >> > > Dale, if there is no spark, what generated the radio noise? > Buly > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html