Received-SPF: pass
 receiver=logan.com; client-ip=209.85.198.236; envelope-from=bartrim@gmail.com
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=subject:from:to:in-reply-to:references:content-type:date:message-id
         :mime-version:x-mailer;
        b=NApEe2jLGU2BL/YBfiO8vWtpz9j3ieL+ivVQCdHEwPDmffdYCmmsQrucBlABq0JtK0
         VV6S5kZ1UeX1Ke+Zeub8ILG5NgymjGOzraf6vSYDb1oIixjOned4MHNE6XJSTGRFJ1fs
         jXlooenoDOqRQB6C/6bk0x+e2IfXDkyH0rtpE=
Subject: Re: [FlyRotary] Re: Harley Davidson Generator
From: Todd Bartrim <bartrim@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-3630896@logan.com>
References: <list-3630896@logan.com>
Content-Type: multipart/related; type="multipart/alternative"; boundary="=-EPEx+gwCHOZ6t6e8+8dc"
Date: Mon, 04 May 2009 01:49:01 -0700
Message-Id: <1241426941.12321.12.camel@Endurance>
Mime-Version: 1.0


--=-EPEx+gwCHOZ6t6e8+8dc
Content-Type: multipart/alternative; boundary="=-7Ljz/wBFXRI5LABD5fOl"


--=-7Ljz/wBFXRI5LABD5fOl
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

Hi Ernest;
    From Georges comment, I gather that the heat sensitivity would
likely be due to the glue that bonds the magnets to the inside of the
rotor. This makes sense and also means that I shouldn't have much of an
issue if no air blows under the rotor and onto the stator. Air movement
around the rotor should be enough.
     I really am a lot less satisfied with "should" than I used to
be.:-P

Todd
C-FSTB


On Sun, 2009-05-03 at 21:01 -0400, Ernest Christley wrote:

> Todd Bartrim wrote:
> > I'm thinking about the cooling issue that you are addressing with fan 
> > blades. How much heat do you think it will generate? I'm 
> > thinking/hoping not much. I don't know about the original Harley 
> > install, but as this is commonly used source of power, I got to 
> > looking at my Ski-Doo, ATV and dirt bike. In everyone of them the 
> > stator/rotor is completely sealed up and is not liquid or oil cooled. 
> > And I've never had issues with them. It would be a simple matter for 
> > me to put a small baffle at the exit of one of the evap cores that I 
> > use for cooling and direct some of the air over the rotor, but due to 
> > the tight fit, not much air would find it's way under to the stator.
> I don't know what sort of heat load it'll generate, but it is almost 
> immaterial to my installation.  For me, he intake air will be flowing 
> over it regardless.  I've been told that PM alternators are only 50% 
> efficient.  I find that hard to believe;  that would be a 500W heat 
> source for a 40A generator.  But even at that worst case, it isn't an 
> issue for me.
> 

--=-7Ljz/wBFXRI5LABD5fOl
Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: 7bit

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN">
<HTML>
<HEAD>
  <META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=UTF-8">
  <META NAME="GENERATOR" CONTENT="GtkHTML/3.26.0">
</HEAD>
<BODY>
Hi Ernest;<BR>
&nbsp;&nbsp;&nbsp; From Georges comment, I gather that the heat sensitivity would likely be due to the glue that bonds the magnets to the inside of the rotor. This makes sense and also means that I shouldn't have much of an issue if no air blows under the rotor and onto the stator. Air movement around the rotor should be enough.<BR>
&nbsp;&nbsp;&nbsp;&nbsp; I really am a lot less satisfied with &quot;should&quot; than I used to be.<IMG SRC="cid:1241426906.12321.10.camel@Endurance" ALIGN="middle" ALT=":-P" BORDER="0"><BR>
<BR>
Todd<BR>
C-FSTB<BR>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%">
<TR>
<TD>
<BR>
</TD>
</TR>
</TABLE>
<BR>
On Sun, 2009-05-03 at 21:01 -0400, Ernest Christley wrote:
<BLOCKQUOTE TYPE=CITE>
<PRE>
Todd Bartrim wrote:
&gt; I'm thinking about the cooling issue that you are addressing with fan 
&gt; blades. How much heat do you think it will generate? I'm 
&gt; thinking/hoping not much. I don't know about the original Harley 
&gt; install, but as this is commonly used source of power, I got to 
&gt; looking at my Ski-Doo, ATV and dirt bike. In everyone of them the 
&gt; stator/rotor is completely sealed up and is not liquid or oil cooled. 
&gt; And I've never had issues with them. It would be a simple matter for 
&gt; me to put a small baffle at the exit of one of the evap cores that I 
&gt; use for cooling and direct some of the air over the rotor, but due to 
&gt; the tight fit, not much air would find it's way under to the stator.
I don't know what sort of heat load it'll generate, but it is almost 
immaterial to my installation.  For me, he intake air will be flowing 
over it regardless.  I've been told that PM alternators are only 50% 
efficient.  I find that hard to believe;  that would be a 500W heat 
source for a 40A generator.  But even at that worst case, it isn't an 
issue for me.

</PRE>
</BLOCKQUOTE>
</BODY>
</HTML>

--=-7Ljz/wBFXRI5LABD5fOl--

--=-EPEx+gwCHOZ6t6e8+8dc
Content-ID: <1241426906.12321.10.camel@Endurance>
Content-Disposition: attachment; filename="face-raspberry.png"
Content-Type: image/png; name="face-raspberry.png"
Content-Transfer-Encoding: base64
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--=-EPEx+gwCHOZ6t6e8+8dc--