Return-Path: <13brv3@bellsouth.net> Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2620254 for flyrotary@lancaironline.net; Wed, 01 Oct 2003 14:58:37 -0400 Received: from rad ([68.212.15.208]) by imf18aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20031001185837.NEUH1874.imf18aec.mail.bellsouth.net@rad> for ; Wed, 1 Oct 2003 14:58:37 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: alternator choice and pulleys? Date: Wed, 1 Oct 2003 13:58:36 -0500 Message-ID: <005e01c3884e$04efb1f0$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_005F_01C38824.1C19A9F0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_005F_01C38824.1C19A9F0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable I use the GEO alt and an advantage with it is that if you kill power to the exciter lead it will stop the power output so you can shut it down in the event of a voltage overrun. Ken Welter =20 East Coast confirmed that the UltraMini works like that as well. After seeing Mark's message, I called around, but the cheapest I could get one = was $135 + $35 core, and that was for a rebuilt unit. I just went ahead and ordered a new alt from East Coast for $219. =20 Now, the problem will be coming up with a double pulley. They said the shaft was 15mm, and the normal size was 17mm, so finding a double pulley might be tricky. If I can't make one work, then I'll have to consider = using just a single V belt, or trying to convert to a serpentine belt. On one hand, a dual belt seems like it would be twice as likely to keep the = water pump running, but in reality, it's not. If the outer belt comes off, = the inner could remain, but if the inner comes off, the outer belt will go = with it. It's tough to say if it really offers any redundancy, but it does = offer more contact area on the water pump pulley, which has a terrible = geometry already. =20 Cheers, Rusty =20 ------=_NextPart_000_005F_01C38824.1C19A9F0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

  I use the GEO alt and an advantage with it is = that if you=20 kill power
to the exciter lead it will stop the power output so you = can shut=20 it
down in the event of a voltage overrun.

  Ken=20 Welter

 
East = Coast confirmed=20 that the UltraMini works like that as well.  After seeing Mark's = message, I=20 called around, but the cheapest I could get one was $135 + $35 core, and = that=20 was for a rebuilt unit.  I just went ahead and ordered a new alt=20 from East Coast for $219.
 
Now, the = problem will be=20 coming up with a double pulley.  They said the shaft was 15mm, and = the=20 normal size was 17mm, so finding a double pulley might be = tricky.  If=20 I can't make one work, then I'll have to consider using just a = single V=20 belt, or trying to convert to a serpentine belt.  On one = hand, a=20 dual belt seems like it would be twice as likely to keep the = water pump=20 running, but in reality, it's not.  If the outer belt comes off, = the inner=20 could remain, but if the inner comes off, the outer belt will go with = it. =20 It's tough to say if it really offers any redundancy, but it does offer = more=20 contact area on the water pump pulley, which has a=20 terrible geometry already.
 
Cheers,
Rusty
  




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