From: "Charlie England ceengland7@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Curved aluminum radiators.
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
References: <list-12871817@logan.com>
Message-ID: <4a3382d7-8d13-ee84-439c-76ceaf054f94@gmail.com>
Date: Thu, 22 Aug 2019 09:56:21 -0500
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On 8/22/2019 4:11 AM, Todd Bartrim bartrim@gmail.com wrote:
> I'm considering making some changes to my cooling system as it is not 
> adequate when flying low & slow, as on recent flights on a few hot 
> days. I'm still using a set of evap cores as they fit the limited 
> space on either side of the PSRU in an RV cowl.
>   Bill Jepson made mention of a curved radiator earlier this summer, 
> which as been simmering on a hot spot way back in my brain ever since. 
> I've spent the last few days looking real hard at the idea.
> The size and shape of the curve looks like it would conform quite 
> nicely to the bottom of the RV cowl. so that the top of the rad would 
> be perpendicular to the airflow while the bottom will curve away. This 
> would require a new ducts to be glassed to take advantage of this, but 
> that would allow for more time and room to slow down the airflow for 
> greater efficiency. It would also almost double the square inches of 
> cooling area than I currently have, however as it is thinner it would 
> provide half of the cubic inches of volume as I currently have.
>  The small thick rads I currently use were chosen more with high 
> speeds in mind (well, and of course ease of installation), but now I'm 
> thinking that I'd rather have a thinner rad that would perform better 
> on the ground and in slow flight. These curved rads seem like they 
> could offer some advantages.
>   I've just found them listed on Amazon.ca for $148CAD with free 
> shipping (x2)which seems pretty resonable, so for $300, it might offer 
> a significant cooling upgrade.... or maybe not.
> I wish I could find an old one to cut open to inspect, test weld, 
> check for fit, etc.
>
> Does anybody have any thoughts on the idea? I'm on the edge so it 
> wouldn't take much to push me over, or pull me back....
>
> Todd Bartrim
ebay. New are considerably cheaper than Amazon.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=Kawasaki+ZX7R+radiator&_sacat=0
Here's a used one:
https://www.ebay.com/itm/1996-ZX7R-ZX7-radiator-stock-zx-7-750-Ninja-96-97-98-99-00-01-02-03/123667309499?fits=Make%3AKawasaki&hash=item1ccb2563bb:g:E5sAAOSwbYZXf8qr:sc:USPSFirstClass!39209!US!-1
Getting them into Canada; can't help much there. :-)

Charlie


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    <div class="moz-cite-prefix">On 8/22/2019 4:11 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-12871817@logan.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">I'm considering making some changes to my cooling
        system as it is not adequate when flying low &amp; slow, as on
        recent flights on a few hot days. I'm still using a set of evap
        cores as they fit the limited space on either side of the PSRU
        in an RV cowl.
        <div>  Bill Jepson made mention of a curved radiator earlier
          this summer, which as been simmering on a hot spot way back in
          my brain ever since. I've spent the last few days looking real
          hard at the idea.</div>
        <div>The size and shape of the curve looks like it would conform
          quite nicely to the bottom of the RV cowl. so that the top of
          the rad would be perpendicular to the airflow while the bottom
          will curve away. This would require a new ducts to be glassed
          to take advantage of this, but that would allow for more time
          and room to slow down the airflow for greater efficiency. It
          would also almost double the square inches of cooling area
          than I currently have, however as it is thinner it would
          provide half of the cubic inches of volume as I currently
          have.</div>
        <div> The small thick rads I currently use were chosen more with
          high speeds in mind (well, and of course ease of
          installation), but now I'm thinking that I'd rather have a
          thinner rad that would perform better on the ground and in
          slow flight. These curved rads seem like they could offer some
          advantages.</div>
        <div>  I've just found them listed on Amazon.ca for $148CAD with
          free shipping (x2)which seems pretty resonable, so for $300,
          it might offer a significant cooling upgrade.... or maybe not.</div>
        <div>I wish I could find an old one to cut open to inspect, test
          weld, check for fit, etc.</div>
        <div><br>
        </div>
        <div>Does anybody have any thoughts on the idea? I'm on the edge
          so it wouldn't take much to push me over, or pull me back....<br>
          <div><br>
          </div>
          <div>
            <div>
              <div dir="ltr" class="gmail_signature"
                data-smartmail="gmail_signature">
                <div dir="ltr">Todd Bartrim</div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
    ebay. New are considerably cheaper than Amazon.<br>
    <a
href="https://www.ebay.com/sch/i.html?_from=R40&amp;_trksid=m570.l1313&amp;_nkw=Kawasaki+ZX7R+radiator&amp;_sacat=0">https://www.ebay.com/sch/i.html?_from=R40&amp;_trksid=m570.l1313&amp;_nkw=Kawasaki+ZX7R+radiator&amp;_sacat=0</a><br>
    Here's a used one:<br>
    <a
href="https://www.ebay.com/itm/1996-ZX7R-ZX7-radiator-stock-zx-7-750-Ninja-96-97-98-99-00-01-02-03/123667309499?fits=Make%3AKawasaki&amp;hash=item1ccb2563bb:g:E5sAAOSwbYZXf8qr:sc:USPSFirstClass!39209!US!-1">https://www.ebay.com/itm/1996-ZX7R-ZX7-radiator-stock-zx-7-750-Ninja-96-97-98-99-00-01-02-03/123667309499?fits=Make%3AKawasaki&amp;hash=item1ccb2563bb:g:E5sAAOSwbYZXf8qr:sc:USPSFirstClass!39209!US!-1</a><br>
    Getting them into Canada; can't help much there. :-)<br>
    <br>
    Charlie<br>
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