X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 24 Oct 2013 12:48:18 -0400 Message-ID: X-Original-Return-Path: Received: from mail-oa0-f46.google.com ([209.85.219.46] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6563158 for lml@lancaironline.net; Thu, 24 Oct 2013 12:22:45 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.219.46; envelope-from=donkarich@gmail.com Received: by mail-oa0-f46.google.com with SMTP id g12so2646643oah.33 for ; Thu, 24 Oct 2013 09:22:12 -0700 (PDT) MIME-Version: 1.0 X-Received: by 10.60.140.168 with SMTP id rh8mr1477220oeb.76.1382631732065; Thu, 24 Oct 2013 09:22:12 -0700 (PDT) Received: by 10.182.29.134 with HTTP; Thu, 24 Oct 2013 09:22:11 -0700 (PDT) Received: by 10.182.29.134 with HTTP; Thu, 24 Oct 2013 09:22:11 -0700 (PDT) In-Reply-To: References: X-Original-Date: Thu, 24 Oct 2013 09:22:11 -0700 X-Original-Message-ID: Subject: Re: [LML] Odyssey PC680 Batteries on Firewall -- Cool Enough? From: Don Karich X-Original-To: Lancair Mailing List Content-Type: multipart/alternative; boundary=047d7b2e4c463ebce404e97f0936 --047d7b2e4c463ebce404e97f0936 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable I have installed two B&C battery on the firewall of my legacy in a12 volt system (dual ellectric system). Initially i had cooling problems and fried the one above the oil cooler. I added a second cooler and oil temps dropped dramatically.since then(500 later) and 7 years later no problems. I have an IO540 lyc On Oct 21, 2013 4:41 AM, "Valin & Allyson Thorn" wrote: > Hey LML gang,**** > > ** ** > > We=92re planning on installing our two Odyssey PC680 AGM 12V batteries > (connected in series for 28 V system) on our Legacy=92s firewall for airp= lane > center of gravity control. This will help our cg because we have a light > weight MT prop, a removable electric air conditioner behind the seats, an= d > our hydraulic pump in the original design location behind the bulkhead in > the tail.**** > > ** ** > > We=92ve seen quite a few airplanes at Oshkosh with batteries on their > firewall. But, as we finalize our firewall layout we couldn=92t help but > wonder if there are any issues with the thermal environment on the firewa= ll > =96 especially when we=92re looking at one of the batteries being downstr= eam of > the airflow going through the oil cooler.**** > > ** ** > > Has anyone measured the temperatures around the firewall in flight? Has > anyone had any issues with their batteries installed on the firewall?**** > > ** ** > > Odyssey=92s stated operating temperature range for their PC680 batteries = , > without a metal jacket, is -40=B0F (-40=B0C) to *113=B0F* (45=B0C)and wit= h a > metal jacket is -40=B0F (-40=B0C) to *176=B0F* (80=B0C).**** > > ** ** > > Mounting them up high on the firewall is likely the coolest. And > avoiding the oil cooler air flow on the left side would be cooler. We > can get them both on the right side away from the oil cooler but would li= ke > to avoid getting the airplane=92s Y/lateral cg too far from the middle wi= th > other heavy things already on the right side. We=92d also prefer to not > install them at the top of the firewall (more like middle) so we don=92t = have > to have a remote oil filter setup and to free that top space for other > components. Installing a battery up high on the left side requires a > remote oil filter setup because of interference for replacement of the oi= l > filter.**** > > ** ** > > Without data and only intuition it seems that the metal jacket PC680=92s > with max op temps of 176 deg F should be okay. Would appreciate hearing > of people=92s flight experiences, firewall temperatures, and comments/adv= ice > related to a battery installations on firewalls.**** > > ** ** > > Thanks,**** > > ** ** > > Valin & Allyson Thorn**** > > Legacy Project**** > > Boulder, Colorado**** > --047d7b2e4c463ebce404e97f0936 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable

I have installed two B&C battery on the firewall of my legacy in a12= volt system (dual ellectric system). Initially i had cooling problems and = fried the one above the oil cooler. I added a second cooler and oil temps d= ropped dramatically.since then(500 later) and 7 years later no problems. I = have an IO540 lyc

On Oct 21, 2013 4:41 AM, "Valin & Allys= on Thorn" <thorn@starfligh= t.aero> wrote:

Hey LML gang,

=A0

We=92re planning on installing = our two Odyssey PC680 AGM 12V batteries (connected in series for 28 V syste= m) on our Legacy=92s firewall for airplane center of gravity control.= =A0 This will help our cg because we have a light weight MT prop, a = removable electric air conditioner behind the seats, and our hydraulic pump= in the original design location behind the bulkhead in the tail.=

=A0<= /span>

We=92ve = seen quite a few airplanes at Oshkosh with batteries on their firewall.=A0 But, as we finalize our firewall layout we couldn=92t help but= wonder if there are any issues with the thermal environment on the firewal= l =96 especially when we=92re looking at one of the batteries being downstr= eam of the airflow going through the oil cooler.

=A0<= /span>

Has anyo= ne measured the temperatures around the firewall in flight?=A0 Has anyone had any issues with their batteries installed on the firewall?<= u>

=A0<= /span>

Odyssey= =92s stated operating temperature range for their PC680 batteries , without= a metal jacket, is -40=B0F (-40=B0C) to 113=B0F (45=B0C)and with a = metal jacket is -40=B0F (-40=B0C) to 176=B0F (80=B0C).=

=A0<= /span>

Mounting= them up high on the firewall is likely the coolest.=A0 And av= oiding the oil cooler air flow on the left side would be cooler.=A0 <= /span>We can get them both on the right side away from the oil cooler but w= ould like to avoid getting the airplane=92s Y/lateral cg too far from the m= iddle with other heavy things already on the right side.=A0 We= =92d also prefer to not install them at the top of the firewall (more like = middle) so we don=92t have to have a remote oil filter setup and to free th= at top space for other components.=A0 Installing a battery up = high on the left side requires a remote oil filter setup because of interfe= rence for replacement of the oil filter.

=A0<= /span>

Without = data and only intuition it seems that the metal jacket PC680=92s with max o= p temps of 176 deg F should be okay.=A0 Would app= reciate hearing of people=92s flight experiences, firewall temperatures, an= d comments/advice related to a battery installations on firewalls.

=A0<= /span>

Thanks,<= u>

=A0<= /span>

Valin &a= mp; Allyson Thorn

Legacy Project<= /u>

Boulder, Colorado

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