From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Inlet radius ratio
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
References: <list-13372725@logan.com>
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Date: Tue, 7 Jan 2020 19:51:21 -0500
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Thanks Charlie,

If it's in those papers I can't find it. (NASA 3405 and AIAA80-1242R)

Sounded like it was an old NACA paper.

Anyone else?

Finn

On 1/7/2020 12:33 PM, Charlie England ceengland7@gmail.com wrote:
> I probably have the paper you're looking for. I'll try to find it for 
> you & send it to you later today.
>
> Charlie
>
> On Tue, Jan 7, 2020 at 11:03 AM Finn Lassen finn.lassen@verizon.net 
> <mailto:finn.lassen@verizon.net> <flyrotary@lancaironline.net 
> <mailto:flyrotary@lancaironline.net>> wrote:
>
>     Tracy reported a marked increase in cooling when changing the
>     inner/outer radius of the duct inlet. The outer radius of the lip
>     should
>     apparently be greater than the inner radius of the lip. He got the
>     optimum ratio from an NACA paper, but don't remember which.
>
>     I think the goal is maximum pressure recovery at low speeds (100 mph)
>     and high angle of attack and of course minimum drag at low and high
>     speeds (output cowl flap to lessen flow at high speeds making the air
>     flow easily around the inlet and cowl at higher speeds).
>
>     I've been trying to locate that paper but keep finding papers on
>     turbine
>     inlets and supersonic inlets.
>
>     Does anyone know what that NACA paper may be? Or even just the
>     optimum
>     radius ratio?
>
>     Finn
>
>
>
>     --
>     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">Thanks Charlie,<br>
      <br>
      If it's in those papers I can't find it. (NASA 3405 and
      AIAA80-1242R)<br>
      <br>
      Sounded like it was an old NACA paper.<br>
      <br>
      Anyone else?<br>
      <br>
      Finn<br>
      <br>
      On 1/7/2020 12:33 PM, Charlie England <a class="moz-txt-link-abbreviated" href="mailto:ceengland7@gmail.com">ceengland7@gmail.com</a> wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:list-13372725@logan.com">
      <meta http-equiv="content-type" content="text/html; charset=utf-8">
      <div dir="ltr">
        <div class="gmail_default" style="font-size:small">I probably
          have the paper you're looking for. I'll try to find it for you
          &amp; send it to you later today.</div>
        <div class="gmail_default" style="font-size:small"><br>
        </div>
        <div class="gmail_default" style="font-size:small">Charlie</div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Tue, Jan 7, 2020 at 11:03
          AM Finn Lassen <a href="mailto:finn.lassen@verizon.net"
            moz-do-not-send="true">finn.lassen@verizon.net</a> &lt;<a
            href="mailto:flyrotary@lancaironline.net"
            moz-do-not-send="true">flyrotary@lancaironline.net</a>&gt;
          wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0px 0px 0px
          0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Tracy
          reported a marked increase in cooling when changing the <br>
          inner/outer radius of the duct inlet. The outer radius of the
          lip should <br>
          apparently be greater than the inner radius of the lip. He got
          the <br>
          optimum ratio from an NACA paper, but don't remember which.<br>
          <br>
          I think the goal is maximum pressure recovery at low speeds
          (100 mph) <br>
          and high angle of attack and of course minimum drag at low and
          high <br>
          speeds (output cowl flap to lessen flow at high speeds making
          the air <br>
          flow easily around the inlet and cowl at higher speeds).<br>
          <br>
          I've been trying to locate that paper but keep finding papers
          on turbine <br>
          inlets and supersonic inlets.<br>
          <br>
          Does anyone know what that NACA paper may be? Or even just the
          optimum <br>
          radius ratio?<br>
          <br>
          Finn<br>
          <br>
          <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.net:81/lists/flyrotary/List.html</a><br>
        </blockquote>
      </div>
    </blockquote>
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