X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from QMTA05.emeryville.ca.mail.comcast.net ([76.96.30.48] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3674454 for flyrotary@lancaironline.net; Sun, 07 Jun 2009 07:05:51 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.48; envelope-from=wschertz@comcast.net Received: from OMTA06.emeryville.ca.mail.comcast.net ([76.96.30.51]) by QMTA05.emeryville.ca.mail.comcast.net with comcast id 0z4l1c00116AWCUA5z5GeL; Sun, 07 Jun 2009 11:05:16 +0000 Received: from WschertzPC ([71.57.77.95]) by OMTA06.emeryville.ca.mail.comcast.net with comcast id 0z5E1c00D23NHuF8Sz5FcJ; Sun, 07 Jun 2009 11:05:16 +0000 Message-ID: From: "Bill Schertz" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: Battery Isolation diodes Date: Sun, 7 Jun 2009 06:05:09 -0500 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 Windows Mail 6.0.6001.18000 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 I have that system. The Blue Mountain EFIS is powered by a small 12V auxiliary battery, that is fed by a Shottky diode from the main bus. When starting to fly, I turn on the EFIS switch, and only the BM unit comes up, after it has booted, I can observe engine gauges, program the GPS portion, etc. Then I turn on main buss and start the engine. The aux battery on the BM unit is isolated from the main bus by the diode, therefore does not sag in voltage with the starter. This also lets me shut off the BM unit last, after engine shutdown and main power off. Bill Schertz KIS Cruiser #4045 N343BS Phase I testing ----- Original Message ----- From: "Greg Ward" To: "Rotary motors in aircraft" Sent: Saturday, June 06, 2009 9:37 PM Subject: [FlyRotary] Re: Battery Isolation diodes > Hey John; > Agree with you on the CB's, but it sounds like a pain in the a... to have > to do that every time you are sitting on the ground programming a GPS. I > think they were talking more of a separate switch, from the battery, that > you could hit, and power the GPS/EFIS only, and then when that was done, > going onto engine start. I am no electrical genius, which is why I was > asking if a switch over like this is possible. In other words, hit a > switch, program, and then go to engine start without losing power to the > GPS/EFIS, forcing a reboot. > Greg > > ----- Original Message ----- > From: "John" > To: "Rotary motors in aircraft" > Sent: Saturday, June 06, 2009 6:10 PM > Subject: [FlyRotary] Re: Battery Isolation diodes > > >> Greg, I have fuses going to the EC-2 and the coils, if I had CB's I could >> switch off the CB's, now I need to pull the fuses, another good reason to >> use CB's. JohnD >> ----- Original Message ----- >> From: "Greg Ward" >> To: "Rotary motors in aircraft" >> Sent: Saturday, June 06, 2009 8:32 PM >> Subject: [FlyRotary] Re: Battery Isolation diodes >> >> >>> Got them Ed, and thanks. One quick question. I went to an AOPA safety >>> seminar, and they recommended a separate ground switch for the GPS, and >>> related equipment, so that they could be programmed without the engine >>> running, as that has been known to take some time, and your head is down >>> with a prop running. Has anybody done this? Any diagrams? >>> Greg Ward >> >>>> >>>> eanderson@carolina.rr.com >>>> >>>> http://www.andersonee.com >>>> >>>> http://www.dmack.net/mazda/index.html >>>> >>>> http://www.flyrotary.com/ >>>> >>>> http://members.cox.net/rogersda/rotary/configs.htm#N494BW >>>> >>>> http://www.rotaryaviation.com/Rotorhead%20Truth.htm >>>> >>>> >>>> -----Original Message----- >>>> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On >>>> Behalf Of Ernest Christley >>>> Sent: Saturday, June 06, 2009 4:23 PM >>>> To: Rotary motors in aircraft >>>> Subject: [FlyRotary] Re: Battery Isolation diodes >>>> >>>> Ed Anderson wrote: >>>>> >>>>> Thanks, Tracy >>>>> >>>>> I was unaware (never thought about it) of the association - perhaps >>>>> not having an isolation diode is one reason I never had any "Noise >>>>> Problem" with the EC2 {:>) >>>>> >>>>> Thanks for the information >>>>> >>>>> Ed >>>>> >>>> When wiring up the diode, it should be fairly simple to drop in a large >>>> value mylar capacitor to conduct the noise. My experience with >>>> electrolytics is that they can be poorly made and leak. The mylars >>>> would >>>> be more robust in the environmental extremes of an airplane. >>>> >>>> In any case, I thought the diode was just for a backup. The switch >>>> would >>>> stay in the same position it has always occupied, so noise would be >>>> absorbed by the battery as it always has. The EC2 would have to be on >>>> the battery side of the switch, which would make it even more noise >>>> isolated when hidden behind the diode. >>>> >>>> -- >>>> >>>> http://www.ernest.isa-geek.org >>>> >>>> >>>> >>>> -- >>>> Homepage: http://www.flyrotary.com/ >>>> Archive and UnSub: >>>> http://mail.lancaironline.net:81/lists/flyrotary/List.html >>>> >>>> __________ Information from ESET NOD32 Antivirus, version of virus >>>> signature >>>> database 3267 (20080714) __________ >>>> >>>> The message was checked by ESET NOD32 Antivirus. >>>> >>>> http://www.eset.com >>>> >>>> >>>> >>>> __________ Information from ESET NOD32 Antivirus, version of virus >>>> signature >>>> database 3267 (20080714) __________ >>>> >>>> The message was checked by ESET NOD32 Antivirus. >>>> >>>> http://www.eset.com >>>> >>>> >>>> >>>> -- >>>> 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 >>> >> >> >> >> -- >> 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 >