X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 1962031 for flyrotary@lancaironline.net; Mon, 02 Apr 2007 08:17:30 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.66; envelope-from=atlasyts@bellsouth.net Received: from ibm61aec.bellsouth.net ([72.153.193.66]) by imf18aec.mail.bellsouth.net with ESMTP id <20070402121642.ZFNX22939.imf18aec.mail.bellsouth.net@ibm61aec.bellsouth.net> for ; Mon, 2 Apr 2007 08:16:42 -0400 Received: from [192.168.0.247] (really [72.153.193.66]) by ibm61aec.bellsouth.net with ESMTP id <20070402121641.GCCS15873.ibm61aec.bellsouth.net@[192.168.0.247]> for ; Mon, 2 Apr 2007 08:16:41 -0400 Mime-Version: 1.0 (Apple Message framework v752.2) In-Reply-To: References: Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: Content-Transfer-Encoding: 7bit From: Bulent Aliev Subject: Re: [FlyRotary] blued terminals radio noise was Re: Uneventful flight Date: Mon, 2 Apr 2007 08:16:38 -0400 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.752.2) Thanks Ed. Glad it is fixed. It was hell flying with constant loud buzzing noise in the head set. Buly On Apr 2, 2007, at 8:08 AM, Ed Anderson wrote: > 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 > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/ > flyrotary/List.html