X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 21 Oct 2013 10:38:45 -0400 Message-ID: X-Original-Return-Path: <2thman1@gmail.com> Received: from mail-pd0-f177.google.com ([209.85.192.177] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6548924 for lml@lancaironline.net; Mon, 21 Oct 2013 09:21:17 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.192.177; envelope-from=2thman1@gmail.com Received: by mail-pd0-f177.google.com with SMTP id p10so5261678pdj.8 for ; Mon, 21 Oct 2013 06:20:43 -0700 (PDT) X-Received: by 10.68.200.233 with SMTP id jv9mr17660792pbc.7.1382361642889; Mon, 21 Oct 2013 06:20:42 -0700 (PDT) X-Original-Return-Path: <2thman1@gmail.com> Received: from [192.168.1.121] (c-208-53-115-208.customer.broadstripe.net. [208.53.115.208]) by mx.google.com with ESMTPSA id wd6sm25793048pab.3.2013.10.21.06.20.41 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 21 Oct 2013 06:20:41 -0700 (PDT) References: In-Reply-To: Mime-Version: 1.0 (1.0) Content-Type: multipart/alternative; boundary=Apple-Mail-C1F611EB-8F63-4D3B-8B31-C8E81968850F X-Original-Message-Id: <7E3ABBCA-5EBD-4BE3-9CDD-E89FF90F5098@gmail.com> Content-Transfer-Encoding: 7bit X-Mailer: iPad Mail (10B329) From: John Barrett <2thman1@gmail.com> Subject: Re: [LML] Odyssey PC680 Batteries on Firewall -- Cool Enough? X-Original-Date: Mon, 21 Oct 2013 06:20:40 -0700 X-Original-To: Lancair Mailing List --Apple-Mail-C1F611EB-8F63-4D3B-8B31-C8E81968850F Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Have two PC 680s on rt side firewall high inside AL box. Turbo down lower do= esn't seem to bother. I doubt your firewall will be as hot in that area as m= ine is. Should not be a problem.=20 John N31VP Sent from my iPad On Oct 21, 2013, at 4:40 AM, "Valin & Allyson Thorn" = wrote: > Hey LML gang, > =20 > We=E2=80=99re planning on installing our two Odyssey PC680 AGM 12V batteri= es (connected in series for 28 V system) on our Legacy=E2=80=99s firewall fo= r 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 sea= ts, and our hydraulic pump in the original design location behind the bulkhe= ad in the tail. > =20 > We=E2=80=99ve seen quite a few airplanes at Oshkosh with batteries on thei= r firewall. But, as we finalize our firewall layout we couldn=E2=80=99t hel= p but wonder if there are any issues with the thermal environment on the fir= ewall =E2=80=93 especially when we=E2=80=99re looking at one of the batterie= s being downstream of the airflow going through the oil cooler. > =20 > Has anyone measured the temperatures around the firewall in flight? Has a= nyone had any issues with their batteries installed on the firewall? > =20 > Odyssey=E2=80=99s stated operating temperature range for their PC680 batte= ries , without a metal jacket, is -40=C2=B0F (-40=C2=B0C) to 113=C2=B0F (45=C2= =B0C)and with a metal jacket is -40=C2=B0F (-40=C2=B0C) to 176=C2=B0F (80=C2= =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 b= oth on the right side away from the oil cooler but would like to avoid getti= ng the airplane=E2=80=99s Y/lateral cg too far from the middle with other he= avy things already on the right side. We=E2=80=99d also prefer to not insta= ll them at the top of the firewall (more like middle) so we don=E2=80=99t ha= ve to have a remote oil filter setup and to free that top space for other co= mponents. Installing a battery up high on the left side requires a remote o= il filter setup because of interference for replacement of the oil filter. > =20 > Without data and only intuition it seems that the metal jacket PC680=E2=80= =99s with max op temps of 176 deg F should be okay. Would appreciate hearin= g of people=E2=80=99s flight experiences, firewall temperatures, and comment= s/advice related to a battery installations on firewalls. > =20 > Thanks, > =20 > Valin & Allyson Thorn > Legacy Project > Boulder, Colorado --Apple-Mail-C1F611EB-8F63-4D3B-8B31-C8E81968850F Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable

Have two PC 680s on rt side firewall h= igh inside AL box. Turbo down lower doesn't seem to bother. I doubt your fir= ewall will be as hot in that area as mine is. Should not be a problem. =

John

N31VP

Sent from my iP= ad

On Oct 21, 2013, at 4:40 AM, "Valin & Al= lyson Thorn" <thorn@starflight.a= ero> wrote:

Hey LML g= ang,

We=E2=80=99= re planning on installing our two Odyssey PC680 AGM 12V batteries (connected= in series for 28 V system) on our Legacy=E2=80=99s firewall for airplane ce= nter of gravity control. This w= ill 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 de= sign location behind the bulkhead in the tail.

We=E2=80=99ve seen quite a few airplanes at O= shkosh with batteries on their firewall.&nb= sp; But, as we finalize our firewall layout we couldn=E2=80=99t help b= ut wonder if there are any issues with the thermal environment on the firewa= ll =E2=80=93 especially when we=E2=80=99re looking at one of the batteries b= eing downstream of the airflow going through the oil cooler.

Has anyone measured the tempera= tures around the firewall in flight? <= /span>Has anyone had any issues with their batteries installed on the firewa= ll?

Odyssey=E2=80= =99s stated operating temperature range for their PC680 batteries , without a= metal jacket, is -40=C2=B0F (-40=C2=B0C) to 113=C2=B0F (45=C2=B0C)and with a metal jacket is -40=C2=B0F (-= 40=C2=B0C) to 176=C2=B0F (80=C2= =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 t= hem both on the right side away from the oil cooler but would like to avoid g= etting the airplane=E2=80=99s Y/lateral cg too far from the middle with othe= r heavy things already on the right side.&n= bsp; We=E2=80=99d also prefer to not install them at the top of the f= irewall (more like middle) so we don=E2=80=99t have to have a remote oil fil= ter setup and to free that top space for other components. Installing a battery up high on the left side r= equires a remote oil filter setup because of interference for replacement of= the oil filter.

deg F should be o= kay. Would appreciate hearing o= f people=E2=80=99s flight experiences, firewall temperatures, and comments/a= dvice related to a battery installations on firewalls.
=

Thanks,

Valin & Allyson Thorn<= /p>
Legacy Project
Boulder, Colorado

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