Return-Path: <13brv3@bellsouth.net> Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 754386 for flyrotary@lancaironline.net; Tue, 22 Feb 2005 12:42:32 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.65; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf17aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050222174142.VOGE2031.imf17aec.mail.bellsouth.net@rd> for ; Tue, 22 Feb 2005 12:41:42 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] 2nd Alternator stuff... revisited.. Date: Tue, 22 Feb 2005 11:42:03 -0600 Message-ID: <045101c51905$d19b6480$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0452_01C518D3.8700F480" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0452_01C518D3.8700F480 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Does anyone have any experience mounting a gear driven alternator attached to/driven by the flexplate gear-ring? Would something along the lines of an 0-200 style permanent magnet alternator be useable? example: http://www.aircraftspruce.com/catalog/eppages/alt200g.php Hi David, I think the problem you'll find with this is the RPM. Looks to me like this is made to run in the accessory case, and be driven by reasonably small gear. Imagine that 11" (just a guess) diameter starter ring gear driving that tiny little gear on the alternator in the picture. We could probably come close to 100,000 rpm :-) On a side note, what is the ABSOLUTE MINIMUM required power to keep the engine running using the EC-2, Delco Coils, ONE electric fuel pump (assume some generic power draw here).. No electric water pumps, not I think someone else already mentioned this, but if our assumption is that you'll lose the belt, then your battery will far outlast your coolant and engine due to the loss of the mechanical water pump. Rusty (need to see your fishing license) ------=_NextPart_000_0452_01C518D3.8700F480 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Does anyone have any experience mounting a gear driven = alternator
attached to/driven by the flexplate gear-ring? Would = something=20 along the
lines of an 0-200 style permanent magnet alternator be=20 useable?
example:  http:/= /www.aircraftspruce.com/catalog/eppages/alt200g.php

Hi = David,   I=20 think the problem you'll find with this is the RPM.  Looks to me = like this=20 is made to run in the accessory case, and be driven by reasonably small=20 gear.  Imagine that 11" (just a guess) diameter starter ring gear = driving=20 that tiny little gear on the alternator in the picture.  We could = probably=20 come close to 100,000 rpm :-)

On a side note, what is the ABSOLUTE MINIMUM required power to keep=20 the
engine running using the EC-2, Delco Coils, ONE electric fuel=20 pump
(assume some generic power draw here).. No electric water pumps, = not

I think someone else = already mentioned=20 this, but if our assumption is that you'll lose the belt, then your = battery will=20 far outlast your coolant and engine due to the loss of the mechanical = water=20 pump. 

Rusty (need to see your = fishing=20 license)

 

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