X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from elasmtp-junco.atl.sa.earthlink.net ([209.86.89.63] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTP id 6548849 for lml@lancaironline.net; Mon, 21 Oct 2013 08:37:05 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.63; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=AMCjXt4SQ9Opf9gCtkUs2TTDL+Hj1TQvAxPOKo5lkavl57qVug3YSTUut0IiJJNO; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [70.105.250.9] (helo=[192.168.1.24]) by elasmtp-junco.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1VYEik-0007Gy-ND for lml@lancaironline.net; Mon, 21 Oct 2013 08:36:31 -0400 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-401-324864297 Subject: Re: [LML] Odyssey PC680 Batteries on Firewall -- Cool Enough? Date: Mon, 21 Oct 2013 08:36:29 -0400 In-Reply-To: To: "Lancair Mailing List" References: Message-Id: <6BE3B5AF-1D7D-4927-80E0-7362A494D87A@earthlink.net> X-Mailer: Apple Mail (2.1085) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940a7e2c60335117e0df3cee732c3e2410f350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 70.105.250.9 --Apple-Mail-401-324864297 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 Hi Valin, I don't know what you will find in a Legacy. In my IV-P I have temp = probes under the engine and on the firewall. temps are in the 150 - 170 = range with a couple blast tubes in the center area. I have about 100 = hours on Odyssey batteries in that location. I can't say for sure they = are happy as I have fried two pair on the ground using an incorrect = charger. (Don't ask me how I did it twice) Do you ever fly solo? right side battery box might be good for that. Colyn On Oct 21, 2013, at 7:40 AM, Valin & Allyson Thorn wrote: Hey LML gang, =20 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 = airplane 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, and our hydraulic pump in the original design location behind = the bulkhead in the tail. =20 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 = firewall =96 especially when we=92re looking at one of the batteries = being downstream of the airflow going through the oil cooler. =20 Has anyone measured the temperatures around the firewall in flight? Has = anyone had any issues with their batteries installed on the firewall? =20 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). =20 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 = like to avoid getting the airplane=92s Y/lateral cg too far from the = middle with 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 oil filter. =20 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/advice related to a battery installations on firewalls. =20 Thanks, =20 Valin & Allyson Thorn Legacy Project Boulder, Colorado --Apple-Mail-401-324864297 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 Hi Valin,

I don't know what you = will find in a Legacy.  In my IV-P I have temp probes under the = engine and on the firewall.  temps are in the 150 - 170 range with = a couple blast tubes in the center area.   I have about 100 hours = on Odyssey batteries in that location.   I can't say for sure they = are happy as I have fried two pair on the ground using an incorrect = charger.  (Don't ask me how I did it = twice)

Do you ever fly solo?   right side = battery box might be good for = that.

Colyn

On Oct 21, = 2013, at 7:40 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 airplane 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, and 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 firewall =96 especially when = we=92re looking at one of the batteries being downstream 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 with 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 like to avoid = getting the airplane=92s Y/lateral cg too far from the middle with 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 oil = 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/advice related to a battery installations on = firewalls.
 
Thanks,
 
Valin & Allyson Thorn
Legacy = Project
Boulder, = Colorado

= = --Apple-Mail-401-324864297--