X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 21 Oct 2013 07:40:13 -0400 Message-ID: X-Original-Return-Path: Received: from argon.lunarpages.com ([216.97.227.30] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6548133 for lml@lancaironline.net; Sun, 20 Oct 2013 12:16:45 -0400 Received-SPF: pass receiver=logan.com; client-ip=216.97.227.30; envelope-from=thorn@starflight.aero Received: from 65-128-94-248.hlrn.qwest.net ([65.128.94.248]:53087 helo=VAlien2) by argon.lunarpages.com with esmtpa (Exim 4.77) (envelope-from ) id 1VXvfi-0002Hi-Nu for lml@lancaironline.net; Sun, 20 Oct 2013 09:16:07 -0700 From: "Valin & Allyson Thorn" X-Original-To: "'Lancair Mailing List'" X-Original-Cc: "Valin & Allyson Thorn" Subject: Odyssey PC680 Batteries on Firewall -- Cool Enough? X-Original-Date: Sun, 20 Oct 2013 10:16:02 -0600 X-Original-Message-ID: <002401cecdaf$ac6f28a0$054d79e0$@starflight.aero> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0025_01CECD7D.61D729A0" X-Mailer: Microsoft Outlook 15.0 Content-Language: en-us Thread-Index: Ac7Nr4MZP+aRAsElQseAlVMMw9mAsg== X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - argon.lunarpages.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - starflight.aero X-Get-Message-Sender-Via: argon.lunarpages.com: authenticated_id: thorn@starflight.aero This is a multipart message in MIME format. ------=_NextPart_000_0025_01CECD7D.61D729A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 ------=_NextPart_000_0025_01CECD7D.61D729A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hey LML = gang,

 

We’re planning on installing = our two Odyssey PC680 AGM 12V batteries (connected in series for 28 V = system) on our Legacy’s 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.

 

We’ve seen quite a few = airplanes at Oshkosh with batteries on their firewall.=A0 But, as we finalize our firewall = layout we couldn’t help but wonder if there are any issues with = the thermal environment on the firewall – especially when = we’re 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?=A0 = Has anyone had any issues with their batteries installed on the = firewall?

 

Odyssey’s 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.=A0 = And avoiding the oil cooler air flow on the left side would be = cooler.=A0 We can get them both = on the right side away from the oil cooler but would like to avoid = getting the airplane’s Y/lateral cg too far from the middle with = other heavy things already on the right side.=A0 We’d also prefer to not = install them at the top of the firewall (more like middle) so we = don’t have to have a remote oil filter setup and to free that top = space for other components.=A0 = 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’s with max op temps of 176 deg F should be okay.=A0 Would appreciate hearing of = people’s flight experiences, firewall temperatures, and = comments/advice related to a battery installations on = firewalls.

 

Thanks,

 

Valin & Allyson = Thorn

Legacy = Project

Boulder, = Colorado

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