From: "Neil Unger 12348ung@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: alternator
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Thu, 14 Jun 2018 12:25:44 +1000
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Todd,

                 Main measurement is the ID of the stator pack.  I have 
to have an ID of 2 5/8 inches to clear my cushion drive, Then with 
modification I may have 1 3/4 inches space between the plate and the 
cushion drive plate.  Will have to measure.  The harley seems a good 
price compared to the Racemate.  Neil.


On 6/14/2018 11:29 AM, Todd Bartrim bartrim@gmail.com wrote:
> Hi Neil;
>   First, my apologies for not answering your earlier question sooner, 
> but it's been a busy week.
> I'm not certain which dimension that you were looking for, but with it 
> in place it is difficult to measure anything but the rotor cup.
> Those measurements are 6.3" OD on the cup and after I machined a 
> little off the face edge of the cup I was left with 1.35" thickness. 
> Looking back at my report it looks like I had to remove a total of 
> about 0.156 off both sides of the cup to make it fit so it was 
> probably about 1.5" thick originally. At the time I did this I had 
> detailed notes on every possible dimension, but that was some years back.
>    Not knowing enough about your PSRU, I can't say for certain which 
> would be a good fit, but from what I can see of the Racemate, while it 
> is a good solution for the purpose in which it was intended as a belt 
> driven waterpump alt, I think if I was to do it again, I would not 
> hesitate to use the Harley style again, rather than pay extra to 
> modify something that is well designed for the other end of the engine.
>   But I would not buy it from the local Harley shop ever again as I 
> paid far too much for it. I would use the Compufire #55540 kit with 
> rotor, stator & regulator which can be bought at Amazon.com right now 
> for $197.64 usd.
> https://www.amazon.com/Compu-Fire-32-amp-Charging-System-55540/product-reviews/B000GUWM5K
> This would be your most cost effective way to add it in and apparently 
> Compufire is manufactured in the USA. (for those worried that it is a 
> cheap Chinese knock-off)
>   As far as machining costs, once again I do not know the details of 
> your design, but with mine the greatest difficulty was in doing it as 
> a one off design. But if I was to have been doing a bunch of them, I 
> don't think the additional machining would be too onerous, but would 
> not be able to put a dollar amount on that work. And of course, 
> outside of machining and parts costs, you've got to cut yourself a 
> little something as profit for this venture.
>   Now with that said, to answer your current question if we think it 
> would be worth it, I would say yes. I've been doing a fair bit of 
> ground testing for unrelated issues but as I disconnected my main 
> alternator in order to access oil lines, I've been running on the 
> back-up PM alt only and it is working flawlessly. Even with both 
> working I can switch seamlessly from the main to the back-up with only 
> a slight volt drop of 0.4 due to different voltage regulators.
>   It seems like a lot of money, but in my opinion it is better money 
> spent than on a back-up lightweight battery. Of course I won't be a 
> customer since I already have it and my opinion is biased, but while I 
> could list more than a handful of things that I wouldn't do again, 
> this isn't one of them.
>   I would do it again in a heartbeat.
>
> Todd
>
> Todd Bartrim
>
> On Wed, Jun 13, 2018 at 4:42 PM, Neil Unger 12348ung@gmail.com 
> <mailto:12348ung@gmail.com> <flyrotary@lancaironline.net 
> <mailto:flyrotary@lancaironline.net>> wrote:
>
>     Group,
>
>                           Have done some investigation into mounting
>     another generator on the cushion drive and I think it is possible
>     if I use the Racemate rather than the harley.  Cost appears to be
>     similar but the dimensions of the Racement seem more adaptable.  I
>     will have to alter the cushion drive to fit, but that is simply an
>     annoyance at this stage.  Guessing the cost involved it looks like
>     $350 for the generator and regulator, plus possibly an additional
>     $200 for machining making an additional $550 USD for the generator.
>
>     IS this cost effective??  You only can answer this for me. The
>     generator puts out 35 amps.
>
>     What say you all?
>
>     Regards.  Neil
>
>     --
>     Homepage: http://www.flyrotary.com/
>     Archive and UnSub:
>     http://mail.lancaironline.net:81/lists/flyrotary/List.html
>     <http://mail.lancaironline.net:81/lists/flyrotary/List.html>
>
>


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    <p>Todd,</p>
    <p>                Main measurement is the ID of the stator pack.  I
      have to have an ID of 2 5/8 inches to clear my cushion drive, Then
      with modification I may have 1 3/4 inches space between the plate
      and the cushion drive plate.  Will have to measure.  The harley
      seems a good price compared to the Racemate.  Neil.<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 6/14/2018 11:29 AM, Todd Bartrim
      <a class="moz-txt-link-abbreviated" href="mailto:bartrim@gmail.com">bartrim@gmail.com</a> wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:list-11257214@logan.com">
      <div dir="ltr">Hi Neil;
        <div>  First, my apologies for not answering your earlier
          question sooner, but it's been a busy week.</div>
        <div>I'm not certain which dimension that you were looking for,
          but with it in place it is difficult to measure anything but
          the rotor cup.</div>
        <div>Those measurements are 6.3" OD on the cup and after I
          machined a little off the face edge of the cup I was left with
          1.35" thickness. Looking back at my report it looks like I had
          to remove a total of about 0.156 off both sides of the cup to
          make it fit so it was probably about 1.5" thick originally. At
          the time I did this I had detailed notes on every possible
          dimension, but that was some years back.</div>
        <div>   Not knowing enough about your PSRU, I can't say for
          certain which would be a good fit, but from what I can see of
          the Racemate, while it is a good solution for the purpose in
          which it was intended as a belt driven waterpump alt, I think
          if I was to do it again, I would not hesitate to use the
          Harley style again, rather than pay extra to modify something
          that is well designed for the other end of the engine.</div>
        <div>  But I would not buy it from the local Harley shop ever
          again as I paid far too much for it. I would use the Compufire
          #55540 kit with rotor, stator &amp; regulator which can be
          bought at Amazon.com right now for $197.64 usd.</div>
        <div><a
href="https://www.amazon.com/Compu-Fire-32-amp-Charging-System-55540/product-reviews/B000GUWM5K"
            moz-do-not-send="true">https://www.amazon.com/Compu-Fire-32-amp-Charging-System-55540/product-reviews/B000GUWM5K</a></div>
        <div>This would be your most cost effective way to add it in and
          apparently Compufire is manufactured in the USA. (for those
          worried that it is a cheap Chinese knock-off)</div>
        <div>  As far as machining costs, once again I do not know the
          details of your design, but with mine the greatest difficulty
          was in doing it as a one off design. But if I was to have been
          doing a bunch of them, I don't think the additional machining
          would be too onerous, but would not be able to put a dollar
          amount on that work. And of course, outside of machining and
          parts costs, you've got to cut yourself a little something as
          profit for this venture.</div>
        <div>  Now with that said, to answer your current question if we
          think it would be worth it, I would say yes. I've been doing a
          fair bit of ground testing for unrelated issues but as I
          disconnected my main alternator in order to access oil lines,
          I've been running on the back-up PM alt only and it is working
          flawlessly. Even with both working I can switch seamlessly
          from the main to the back-up with only a slight volt drop of
          0.4 due to different voltage regulators.</div>
        <div>  It seems like a lot of money, but in my opinion it is
          better money spent than on a back-up lightweight battery. Of
          course I won't be a customer since I already have it and my
          opinion is biased, but while I could list more than a handful
          of things that I wouldn't do again, this isn't one of them.</div>
        <div>  I would do it again in a heartbeat.</div>
        <div><br>
        </div>
        <div>Todd</div>
      </div>
      <div class="gmail_extra"><br clear="all">
        <div>
          <div class="gmail_signature" data-smartmail="gmail_signature">
            <div dir="ltr">Todd Bartrim</div>
          </div>
        </div>
        <br>
        <div class="gmail_quote">On Wed, Jun 13, 2018 at 4:42 PM, Neil
          Unger <a href="mailto:12348ung@gmail.com"
            moz-do-not-send="true">12348ung@gmail.com</a> <span
            dir="ltr">&lt;<a href="mailto:flyrotary@lancaironline.net"
              target="_blank" moz-do-not-send="true">flyrotary@lancaironline.net</a>&gt;</span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">Group,<br>
            <br>
                                  Have done some investigation into
            mounting another generator on the cushion drive and I think
            it is possible if I use the Racemate rather than the
            harley.  Cost appears to be similar but the dimensions of
            the Racement seem more adaptable.  I will have to alter the
            cushion drive to fit, but that is simply an annoyance at
            this stage.  Guessing the cost involved it looks like $350
            for the generator and regulator, plus possibly an additional
            $200 for machining making an additional $550 USD for the
            generator.<br>
            <br>
            IS this cost effective??  You only can answer this for me. 
            The generator puts out 35 amps.<br>
            <br>
            What say you all?<br>
            <br>
            Regards.  Neil<br>
            <br>
            --<br>
            Homepage:  <a href="http://www.flyrotary.com/"
              rel="noreferrer" target="_blank" moz-do-not-send="true">http://www.flyrotary.com/</a><br>
            Archive and UnSub:   <a
              href="http://mail.lancaironline.net:81/lists/flyrotary/List.html"
              rel="noreferrer" target="_blank" moz-do-not-send="true">http://mail.lancaironline.<wbr>net:81/lists/flyrotary/List.<wbr>html</a><br>
          </blockquote>
        </div>
        <br>
      </div>
    </blockquote>
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