X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from qw-out-2122.google.com ([74.125.92.26] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3672783 for flyrotary@lancaironline.net; Fri, 05 Jun 2009 10:21:53 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.92.26; envelope-from=rwstracy@gmail.com Received: by qw-out-2122.google.com with SMTP id 8so894089qwh.25 for ; Fri, 05 Jun 2009 07:21:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:date :x-google-sender-auth:message-id:subject:from:to:content-type; bh=RNgVyWuGM7EZ2PSxHmg0pgokpk/xSlLLE+jj5VOIbL4=; b=r/RvkcJbFQSCviDyBj/0kbCPHCkYknQxjZfFgQw9fKBQWSJGCpNXasSyJnW3Bpkhgn VCSftmyty3VFg69ODHVLLCBd8flGGQOUU5EuUSFiW7BUpuwdTGeXQLqSOlYcF6g5lq54 b19sVwEIdVAZr0MAT41vWbvUEbm+xDto0hCMM= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:date:x-google-sender-auth:message-id:subject :from:to:content-type; b=h330NCq8uMRHMTqCMWFrIELDBP8IgAZL5Fhr6bbiU30CJUhi/CiKlIAaoW2U8fLvu8 T8DSp6HMgSclu+g+26y+uyWz1UYHU4LnyuRaxBgSS9ZuJL6goT39wt/iqBzq4XurDv/F FCW3PINig4/yc7LBP9KwZkxWjyFvxNYRVgBhY= MIME-Version: 1.0 Sender: rwstracy@gmail.com Received: by 10.224.11.17 with SMTP id r17mr3629389qar.183.1244211675832; Fri, 05 Jun 2009 07:21:15 -0700 (PDT) Date: Fri, 5 Jun 2009 10:21:15 -0400 X-Google-Sender-Auth: 92b70e3000556967 Message-ID: <1b4b137c0906050721g4d590d08ye638e24fb6dad5f2@mail.gmail.com> Subject: Re: [FlyRotary] Battery Isolation diodes From: Tracy Crook To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0015175cba62f6a20f046b9a9aa1 --0015175cba62f6a20f046b9a9aa1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Just one comment about the isolation diodes idea. I hate it. It's for my own selfish reason though. The diodes not only isolate potential faults, they isolate electrical noise from the battery which increases the noise on the rest of the system. Noise on systems with poor electrical system layout has been my number 1 headache. These diodes multiply the problem by at least a factor of two. If you insist on using the diodes, you might want to install a capacitor at your main power distribution point. Those big electrolytics that the monster car audio systems use would be ideal : ) The electrical systems guru (Bob K.) points out that batteries do not make a good noise absorber and that is technically true but I would counter that they are infinitely better than nothing at all. Tracy On Fri, Jun 5, 2009 at 7:47 AM, Ed Anderson wrote: > > > Jim Maher was kind enough to convert the large DXF files of my electrical > system to JPG so perhaps more of you can examine it. Recall I have removed > the 2nd battery stuff - so ignore that on the diagrams. Also the diagram > does not show any of the detailed EC2/injector/ignition wiring - follow > Tracy's recommendations on that. > > As you will note there is no "isolation" diode between alternator and > battery and also that the battery voltage holds the master relay closed. > That is another change I must make. I must have decided (10+ years ago) > that the battery would never fail - only the alternator. Clearly (now), > without battery voltage (in my design) to hold the master relay closed - > when the battery voltage fall to around 6-7 volts (in my case) the relay > opens and all that good electrical power being produced by the perfectly > good alternator - can not reach any part of the electrical system. Clearly > NOT good as I could have continued to fly perfectly well with just the > alternator juice. > > Your design is not going to be any better than the accuracy of your > assumptions. Clearly some of my assumptions make 10 years ago definitely > need revising. > > Ed > > > The message is ready to be sent with the following file or link > attachments: > > DIAG_3B.jpg > DIAG_2B.jpg > DIAG_1B.jpg > > > Note: To protect against computer viruses, e-mail programs may prevent > sending or receiving certain types of file attachments. Check your e-mail > security settings to determine how attachments are handled. > > > __________ Information from ESET NOD32 Antivirus, version of virus > signature > database 3267 (20080714) __________ > > The message was checked by ESET NOD32 Antivirus. > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > --0015175cba62f6a20f046b9a9aa1 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Just one comment about the isolation diodes idea.=A0 I hate it.=A0 It's= for my own selfish reason though.=A0 The diodes not only isolate potential= faults, they isolate electrical noise from the battery which increases the= noise on the rest of the system.=A0=A0 Noise on systems with poor electric= al system layout has been my number 1 headache.=A0=A0 These diodes multiply= the problem by at least a factor of two.=A0 If you insist on using the dio= des, you might want to install a capacitor at your main power distribution = point.=A0 Those big electrolytics that the monster car audio systems use wo= uld be ideal : )

The electrical systems guru (Bob K.) points out that batteries do not m= ake a good noise absorber and that is technically true but I would counter = that they are infinitely better than nothing at all.=A0

Tracy

On Fri, Jun 5, 2009 at 7:47 AM, Ed Anderson = <eanderso= n@carolina.rr.com> wrote:


Jim Maher was kind enough to convert the large DXF files of my electrical system to JPG so perhaps more of you can examine it. =A0Recall I have remov= ed
the 2nd battery stuff - so ignore that on the diagrams. =A0Also the diagram=
does not show any of the detailed EC2/injector/ignition wiring - follow
Tracy's recommendations on that.

As you will note there is no "isolation" diode between alternator= and
battery and also that the battery voltage holds the master relay closed. That is another change I must make. =A0I must have decided (10+ years ago)<= br> that the battery would never fail - only the alternator. =A0Clearly (now),<= br> without battery voltage (in my design) to hold the master relay =A0closed -=
when the battery voltage fall to around 6-7 volts (in my case) the relay opens and all that good electrical power being produced by the perfectly good alternator - can not reach any part of the electrical system. =A0Clear= ly
NOT good as I could have continued to fly perfectly well with just the
alternator juice.

Your design is not going to be any better than the accuracy of your
assumptions. =A0Clearly some of my assumptions make 10 years ago definitely=
need revising.

Ed


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Note: To protect against computer viruses, e-mail programs may prevent
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The message was checked by ESET NOD32 Antivirus.



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Homepage: =A0http:/= /www.flyrotary.com/
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