Return-Path: Received: from sccrmhc11.comcast.net ([204.127.202.55] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 520545 for flyrotary@lancaironline.net; Sat, 06 Nov 2004 11:25:05 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.202.55; envelope-from=kenpowell@comcast.net Received: from 204.127.205.142 (sccrwbc58.attbi.com[204.127.205.158]) by comcast.net (sccrmhc11) with SMTP id <20041106162435011002u4poe>; Sat, 6 Nov 2004 16:24:35 +0000 Received: from [68.51.44.162] by 204.127.205.142; Sat, 06 Nov 2004 16:24:35 +0000 From: kenpowell@comcast.net To: "Rotary motors in aircraft" Subject: [FlyRotary] EWP Date: Sat, 06 Nov 2004 16:24:35 +0000 Message-Id: <110620041624.12183.418CFAC10003D54500002F97220588636004040A99019F020A05@comcast.net> X-Mailer: AT&T Message Center Version 1 (Sep 14 2004) X-Authenticated-Sender: a2VucG93ZWxsQGNvbWNhc3QubmV0 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_12183_1099758275_0" --NextPart_Webmail_9m3u9jl4l_12183_1099758275_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Good question Bulent. This is a show stopper for me. It takes a minimum of 13 amps to drive the fuel injection and ignition system. I agree that 1 hour endurance is a reasonable assumption; I am using 45 minutes to allow for greater than expected battery degredation (I wiill replace the battery yearly). I agree that the EWP will shorten this endurance considerably. Dual alternators would minimize this risk. Unfortunately 2 alternators just will not fit under the cowl of my RV-4. I am considering a snowmobile/motorcycle type PM alternator but I am a LONG ways from addressing this feature. So I will add to Bulent's question - what will be the current draw at 25 gallons per minute when installed in a functioning cooling system? Ken Powell -------------- Original message -------------- > Did anybody figure out by how much the engine run time will be shortened > after an alternator failure. Now we know the engine will run approx. 1 hour > before it quits. The electric water pump will shorten this time a lot I > think. > Bulent > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html --NextPart_Webmail_9m3u9jl4l_12183_1099758275_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

Good question Bulent. This is a show stopper for me. It takes a minimum of 13 amps to drive the fuel injection and ignition system. I agree that 1 hour endurance is a reasonable assumption; I am using 45 minutes to allow for greater than expected battery degredation (I wiill replace the battery yearly). I agree that the EWP will shorten this endurance considerably. Dual alternators would minimize this risk. Unfortunately 2 alternators just will not fit under the cowl of my RV-4. I am considering a snowmobile/motorcycle type PM alternator but I am a LONG ways from addressing this feature. So I will add to Bulent's question - what will be the current draw at 25 gallons per minute when installed in a functioning cooling system?

Ken Powell

-------------- Original message --------------

> Did anybody figure out by how much the engine run time will be shortened
> after an alternator failure. Now we know the engine will run approx. 1 hour
> before it quits. The electric water pump will shorten this time a lot I
> think.
> Bulent
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html

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