X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 25 Jan 2008 06:18:50 -0500 Message-ID: X-Original-Return-Path: Received: from wind.imbris.com ([216.18.130.7] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTPS id 2692324 for lml@lancaironline.net; Thu, 24 Jan 2008 18:52:34 -0500 Received-SPF: none receiver=logan.com; client-ip=216.18.130.7; envelope-from=brent@regandesigns.com Received: from [192.168.1.100] (cbl-238-80.conceptcable.com [207.170.238.80] (may be forged)) (authenticated bits=0) by wind.imbris.com (8.12.11/8.12.11.S) with ESMTP id m0ONpttB031356 for ; Thu, 24 Jan 2008 15:51:55 -0800 (PST) (envelope-from brent@regandesigns.com) X-Original-Message-ID: <47992494.4030208@regandesigns.com> X-Original-Date: Thu, 24 Jan 2008 15:51:48 -0800 From: Brent Regan User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: Electric Powered Lancair - Long Content-Type: multipart/alternative; boundary="------------010907070306080505020902" This is a multi-part message in MIME format. --------------010907070306080505020902 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Interesting analysis Jim. A quick calculation of my IV-P's power system energy density (stored useful energy that will come out the prop flange divided by the weight of the engine and the fuel) gives a figure of 0.8 KwHr/Lb. This compares to the current (npi) technology of 0.044 KwHr/Lb (battery,+motor+controller) giving a ratio of 18:1. It is therefore true that having batteries with 10X the energy density would make them competitive with hydrocarbons BUT the battery article did not tell the full story. The density improvement was in the silicone ANODE only. The cell now becomes cathode limited and the true improvement in energy density at the cell level is only 2:1. Not shabby, but a long way from 10:1. Technology marches on and though it may be too soon to be scrapping the old four banger, it's not too soon to dream. Regards Brent Regan --------------010907070306080505020902 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Interesting analysis Jim. A quick calculation of my IV-P's power system energy density (stored useful energy that will come out the prop flange divided by the weight of the engine and the fuel) gives a figure of 0.8 KwHr/Lb. This compares to the current (npi) technology of 0.044 KwHr/Lb (battery,+motor+controller) giving a ratio of 18:1. It is therefore true that having batteries with 10X the energy density would make them competitive with hydrocarbons BUT the battery article did not tell the full story. The density improvement was in the silicone ANODE only. The cell now becomes cathode limited and the true improvement in energy density at the cell level is only 2:1. Not shabby, but a long way from 10:1.

Technology marches on and though it may be too soon to be scrapping the old four banger, it's not too soon to dream.

Regards
Brent Regan
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