Return-Path: Received: from ms-smtp-03.southeast.rr.com ([24.93.67.84] verified) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2620310 for flyrotary@lancaironline.net; Wed, 01 Oct 2003 15:29:16 -0400 Received: from o7y6b5 (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-03.southeast.rr.com (8.12.10/8.12.2) with SMTP id h91JQwW0011491 for ; Wed, 1 Oct 2003 15:26:59 -0400 (EDT) Message-ID: <002b01c38852$0d725b80$1702a8c0@WorkGroup> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: alternator choice and pulleys? Date: Wed, 1 Oct 2003 15:27:28 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0028_01C38830.86360200" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0028_01C38830.86360200 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =20 ----- Original Message -----=20 From: Rick Girard=20 To: Rotary motors in aircraft=20 Sent: Wednesday, October 01, 2003 3:25 PM Subject: [FlyRotary] Re: alternator choice and pulleys? Russell Duffy wrote: 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 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. 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. Cheers, Rusty =20 Rusty, for what is worth - you know - my usual 0.02 worth. I previously ran two belts to alternator and water pump. Once I = added the smog pump for a vacuum source, the geometry forced me to = either give up dual belts on the water pump OR the alternator. I figure = I wanted the water pump working more than the alternator. So only one = belt on the alternator. I do use top quality Gates belts as I found = that some of the off brand automobile belts would shread in a short = amount of time. I came back from one long flight with half of the = "cogs" missing from one such, so the belt was clearly on the verge of = failure. Ed ------=_NextPart_000_0028_01C38830.86360200 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 Rick = Girard=20
Sent: Wednesday, October 01, = 2003 3:25=20 PM
Subject: [FlyRotary] Re: = alternator=20 choice and pulleys?

Russell Duffy wrote:

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

 Rusty, for what is worth - you know - my = usual 0.02=20 worth.

I previously ran two belts to = alternator and=20 water pump.  Once I added the smog pump for a vacuum source, = the=20 geometry forced me to either give up dual belts on the water pump OR = the=20 alternator.  I figure I wanted the water pump working more than = the=20 alternator.  So only one belt on the alternator.  I do use = top=20 quality Gates belts as I found that some of the off brand automobile = belts=20 would shread in a short amount of time.  I came back from one = long=20 flight with half of the "cogs" missing from one such, so the belt = was=20 clearly on the verge of failure.

Ed

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