X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 934202 for flyrotary@lancaironline.net; Thu, 05 May 2005 21:27:37 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-189-178.carolina.res.rr.com [24.74.189.178]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j461Qm0W005341 for ; Thu, 5 May 2005 21:26:49 -0400 (EDT) Message-ID: <002c01c551da$b1584680$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Mismarked Fuse?? Date: Thu, 5 May 2005 21:26:56 -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 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine Right you are Bill, Brain fade - too long sniffing epoxy fumes doing the duct {:>). Brain fade in any case. Ed ----- Original Message ----- From: "William" To: "Rotary motors in aircraft" Sent: Thursday, May 05, 2005 8:41 PM Subject: [FlyRotary] Re: Mismarked Fuse?? > Ed, your hypothetical scenario has a problem. Although power is > current*voltage, it is really current time *voltage_drop* across the fuse. > The voltage drop will not go up unless the current goes up. > > Bill Schertz > KIS Cruiser # 4045 > ----- Original Message ----- > From: "Ed Anderson" > >> Here is a hypothetical scenario - lets say your alternator decides to go >> west in a failure mode that produces 40 volts (yes, there is an >> overvoltage failure that can produce voltages approach 60 -100 volts). >> Since you fuel pump will draw the basically the same current (perhaps a >> bit more with the higher voltage) the power across the fuse (Power = >> current * Voltage) will jump approx 4-5 fold. (It is the power rating >> rather than current that causes a fuse to blow by the way). You have >> just blown several fuses - could be critical ones. Your alternator has >> died or you have disabled it and you could make it on the battery - but, >> fuse is blown. Circuit breaker reset and one of your two redundant >> circuits (perhaps both) may work again. Just a hypothetical scenario. > .net/lists/flyrotary/List.html > >>> Homepage: http://www.flyrotary.com/ >>> Archive: http://lancaironline.net/lists/flyrotary/List.html