From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] N214FL RV-4 First Flight
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
References: <list-1261026@logan.com>
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Date: Sat, 27 Feb 2021 23:29:33 -0500
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Yep, inlet/outlets on rads are very, very restrictive. 7/64x1/2" (0.05 
sqin or 1/4" diameter hole equivalent)) at best. I was aware of it when 
I JB-welded 5/8" and 3/4" over existing tubes and "just wanted to see 
how it would work" and then forgot about it.

Drilling holes in tank end plates I also found a small tube inside one 
tank and baffles in both tanks. Now removed.

As for airflow, when I get new elbows welded onto the rads I'll collect 
new data. I think the large delta is due to the very slow coolant flow 
-- stays in rads way too long (and thus not circulating through the 
engine fast enough).

Finn

On 2/27/2021 9:32 PM, Steven W. Boese SBoese@uwyo.edu wrote:
> Finn,
>
> If the "WTeng" sensor location is somewhere in the engine block and 
> not at the coolant outlet and the "WTout" sensor is in the coolant 
> exiting the engine, then the coolant flow rate through the system may 
> need to be increased by enlarging the radiator connections.� 
> Typically, it seems that at normal operating temps, the delta-T across 
> the engine and across the radiators is about 15 deg F.
>
> It also would appear that the mass air flow through the radiators may 
> need to be increased since the air delta T is quite large and the temp 
> of the air exiting the radiators is close to temp of the coolant 
> exiting the radiators.� If your OAT were increased to 100 deg F, you 
> could see "WTout" of ~250 deg F with the setup as it is now.
>
> The attached plots show the effect of changing only the air inlet and 
> outlet areas of my system which has ~0.9" id plumbing to the single 
> radiator.
>
> FWIW
>
> Steve Boese
>
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html


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    <div class="moz-cite-prefix">Yep, inlet/outlets on rads are very,
      very restrictive. 7/64x1/2" (0.05 sqin or 1/4" diameter hole
      equivalent)) at best. I was aware of it when I JB-welded 5/8" and
      3/4" over existing tubes and "just wanted to see how it would
      work" and then forgot about it.<br>
      <br>
      Drilling holes in tank end plates I also found a small tube inside
      one tank and baffles in both tanks. Now removed.<br>
      <br>
      As for airflow, when I get new elbows welded onto the rads I'll
      collect new data. I think the large delta is due to the very slow
      coolant flow -- stays in rads way too long (and thus not
      circulating through the engine fast enough).<br>
      <br>
      Finn<br>
      <br>
      On 2/27/2021 9:32 PM, Steven W. Boese <a class="moz-txt-link-abbreviated" href="mailto:SBoese@uwyo.edu">SBoese@uwyo.edu</a> wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:list-1261026@logan.com">
      <meta http-equiv="Content-Type" content="text/html;
        charset=windows-1252">
      <style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
      <div style="font-family: Calibri, Arial, Helvetica, sans-serif;
        font-size: 12pt; color: rgb(0, 0, 0);">
        <span style="margin:0px;font-size:12pt">Finn,</span>
        <div style="margin:0px;font-size:12pt"><br>
        </div>
        <div style="margin:0px;font-size:12pt">If the "WTeng" sensor
          location is somewhere in the engine block and not at the
          coolant outlet and the "WTout" sensor is in the coolant
          exiting the engine, then the coolant flow rate through the
          system may need to be increased by enlarging the radiator
          connections.� Typically, it seems that at normal operating
          temps, the delta-T across the engine and across the radiators
          is about 15 deg F.</div>
        <div style="margin:0px;font-size:12pt"><br>
        </div>
        <div style="margin:0px;font-size:12pt">It also would appear that
          the mass air flow through the radiators may need to be
          increased since the air delta T is quite large and the temp of
          the air exiting the radiators is close to temp of the coolant
          exiting the radiators.� If your OAT were increased to 100 deg
          F, you could see "WTout" of ~250 deg F with the setup as it is
          now.</div>
        <div style="margin:0px;font-size:12pt"><br>
        </div>
        <div style="margin:0px;font-size:12pt">The attached plots show
          the effect of changing only the air inlet and outlet areas of
          my system which has ~0.9" id plumbing to the single
          radiator.��</div>
        <div style="margin:0px;font-size:12pt"><br>
        </div>
        <div style="margin:0px;font-size:12pt">FWIW</div>
        <div style="margin:0px;font-size:12pt"><br>
        </div>
        <div style="margin:0px;font-size:12pt">Steve Boese</div>
        <div style="margin:0px">
          <span style="margin:0px;font-size:12pt"></span></div>
        <br>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">--
Homepage:  <a class="moz-txt-link-freetext" href="http://www.flyrotary.com/">http://www.flyrotary.com/</a>
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