X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 04 Nov 2009 17:39:00 -0500 Message-ID: X-Original-Return-Path: Received: from elasmtp-masked.atl.sa.earthlink.net ([209.86.89.68] verified) by logan.com (CommuniGate Pro SMTP 5.2.17) with ESMTP id 3930622 for lml@lancaironline.net; Wed, 04 Nov 2009 12:44:42 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.68; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=qQJrbrLLUgkeRCEpzqRC/QVmc5CzoIO0NbdoO2t/9tMOVXTD+lQVUzHxSBCrLqpx; h=Received:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-ELNK-Trace:X-Originating-IP; Received: from [216.57.118.63] (helo=ccaselt3) by elasmtp-masked.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1N5jtu-0002IH-LM; Wed, 04 Nov 2009 12:44:06 -0500 X-Original-Message-ID: <1d1801ca5d76$680eb980$668c020a@nvidia.com> From: "Colyn Case at earthlink" X-Original-To: "Lancair Mailing List" , "Jeffrey Liegner, MD" References: Subject: Re: L-IVP Battery Cooling X-Original-Date: Wed, 4 Nov 2009 12:44:06 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_1D15_01CA5D4C.7EE9F540" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3598 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940da25e521e6e2be639d44ac2c2c6721d7350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 216.57.118.63 This is a multi-part message in MIME format. ------=_NextPart_000_1D15_01CA5D4C.7EE9F540 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: L-IVP Battery CoolingThe Bob Nuckolls wisdom on this is that some = voltage drop is okay for a starting system. I'm only repeating that not endorsing it. (Caveat, if you have a full feathering prop and would like to air = restart after feathering, it takes 20-30 seconds of vigorous cranking under nasty cold conditions to get it out of feather. = Voltage, and cold cranking amps helpful here) That doesn't worry me nearly so much as high current unprotected wires = in the cockpit, at least when not in starting mode. ----- Original Message -----=20 From: Jeffrey Liegner, MD=20 To: Lancair Mailing List=20 Cc: Colyn Case at earthlink=20 Sent: Wednesday, November 04, 2009 6:40 AM Subject: Re: L-IVP Battery Cooling Also, a remote location causes more voltage drop due to the longer = cable. I have one battery in the back and tried copper wire (very = heavy) and had almost no voltage drop, but when I checked aluminum wires = (very light), I had nearly 1.0v drop from the terminals to the Buss. = Aluminum is OK for avionics Buss, but not cranking or hydralic pump amp = (too much heat and volt loss), if drawing off a battery behind the rear = bulkhead. My humble opinion. Voltage drop per foot is part of the specification of the cable wire = guage and material. Jeff L LIVP ------=_NextPart_000_1D15_01CA5D4C.7EE9F540 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: L-IVP Battery Cooling
The Bob Nuckolls wisdom on this is that = some=20 voltage drop is okay for a starting system.
I'm only repeating that not endorsing=20 it.
(Caveat, if you have a full feathering = prop and=20 would like to air restart after feathering, it takes 20-30 seconds of=20 vigorous
cranking under nasty cold conditions to = get it out=20 of feather.   Voltage, and cold cranking amps helpful=20 here)
 
That doesn't worry me nearly so much as = high=20 current unprotected wires in the cockpit, at least when not in starting=20 mode.
 
----- Original Message -----
From:=20 Jeffrey=20 Liegner, MD
Sent: Wednesday, November 04, = 2009 6:40=20 AM
Subject: Re: L-IVP Battery = Cooling

Also, a remote location causes more voltage drop due to the = longer=20 cable.  I have one battery in the back and tried copper wire = (very heavy)=20 and had almost no voltage drop, but when I checked aluminum wires = (very=20 light), I had nearly 1.0v drop from the terminals to the Buss.  = Aluminum=20 is OK for avionics Buss, but not cranking or hydralic pump amp (too = much heat=20 and volt loss), if drawing off a battery behind the rear = bulkhead.  My=20 humble opinion.

Voltage drop per foot is part of the specification of the cable = wire=20 guage and material.

Jeff L
LIVP

 
------=_NextPart_000_1D15_01CA5D4C.7EE9F540--