X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 28 Apr 2007 15:28:28 -0400 Message-ID: X-Original-Return-Path: Received: from global.delionsden.com ([66.150.29.112] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTPS id 2015246 for lml@lancaironline.net; Sat, 28 Apr 2007 15:07:46 -0400 Received-SPF: none receiver=logan.com; client-ip=66.150.29.112; envelope-from=n103md@yahoo.com Received: from bmackey by global.delionsden.com with local (Exim 4.62) (envelope-from ) id 1HhsFs-0002bc-IF for lml@lancaironline.net; Sat, 28 Apr 2007 15:06:48 -0400 Received: from 69.12.132.145 ([69.12.132.145]) (SquirrelMail authenticated user bmackey) by www.bmackey.com with HTTP; Sat, 28 Apr 2007 12:06:48 -0700 (PDT) X-Original-Message-ID: <1245.69.12.132.145.1177787208.squirrel@www.bmackey.com> X-Original-Date: Sat, 28 Apr 2007 12:06:48 -0700 (PDT) Subject: Re: 12v supply to stabilize avionics From: "bob mackey" X-Original-To: lml@lancaironline.net User-Agent: SquirrelMail/1.4.8 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - global.delionsden.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [32015 2012] / [47 12] X-AntiAbuse: Sender Address Domain - yahoo.com X-Source: X-Source-Args: X-Source-Dir: 1. Why are the avionics on while starting? Why not? Because the electrical system in your Cessna 152 wasn't designed to support that operation. But why should I sit there burning 100LL at $4.09 per gallon so I can punch the flight plan into the GPS while it acquires the satelites? Fortunately I'm not flying a 152, so I can make it better. 2. ...Add an avionics switch. Actually that would achieve the same functionality I have now: The avionics are off during cranking. It fails to keep the avionics up while cranking, and also fails to use most of the battery's energy before brownout. The latter has been offered as an excuse for a 28V system, but adding a second battery costs much more in complexity and weight. I will get the dimensions, weight, efficiency vs load of the 12V supply and post. That may take a while as I'm putting the engine back into our Maule this weekend (Yay!), and also have some business travel coming up.