From: "Neil Unger 12348ung@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Inlet duct sizing
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
References: <list-12848207@logan.com>
Message-ID: <31c02034-fb3e-bd43-97e2-f07d817488f5@gmail.com>
Date: Thu, 15 Aug 2019 16:58:58 +1000
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Mat,  measurements are not exact as I have a cowl in the way, but 
basically I have 90 sq inches  total air  inlet which is divided up 1/3  
2/3 between oil and water.  Cubic inches for oil is 8 x 18 x 2.25 equals 
324 cubic inches for oil.  Water is 13 x 20 x 2.25 giving 585 cubs.

I find this is just good enough in our 105 degrees F  summer heat.  Now 
in winter it takes 10 minutes to heat the water to 80 degrees on the 
thermostat.  Oil is flat to get to 70 degrees, but it is only about 60 
degrees OAT .  I feel a lot of you blokes seem to get away with very 
small radiators, but My Rad is the smallest I would be comfortable with 
in our summers.

Will be interesting to see how you go.

Regards Neil.

On 8/15/2019 1:42 PM, Matt Boiteau mattboiteau@gmail.com wrote:
> I'm having a hard time in this Florida heat, trying to do my first 
> flight. With a highspeed taxi run, (up to 55kts or so), will net my 
> oil and coolant above my warning limits. 240 oil pan, 230 coolant out.
>
> The coolant inlet (44sq") is huge with the idea that down the road I'd 
> go turbo. The rad is from a dodge truck 19 x 24 x 1 = 454sq", with a 
> wedge shape diffuser. Right now it just exits the back of the cowl, no 
> cowl flaps or sub cowl installed yet.
>
> The oil inlet is a lot smaller (~12.5sq"), going to a 2.5" scat hose, 
> then to a trumpet shape which leads into a wedge. The oil rad is 9 x 
> 11 x 2 = 198sq" from cx racing. For the outlet, I have a big box to 
> collect the hot/expanded air, then neck it back down to 2.5" exit. 
> Tomorrow I'll try another taxi test, with the outlet box 
> completely removed and dumping into the cowl.
>
> To find out if my prop is doing anything with airflow into the inlets, 
> used a tube of water and found around 2200 static rpm, it raised the 
> water about 4inches in the oil duct. I think that equals around 
> ~55kts. I thought the prop would of cooled down the rads a lot more, 
> but I guess I have bad duct designs. Maybe move them closer to the 
> blade? Looking at the picture, the oil is on the left with all the 
> green tape. I tried to make the opening bigger with foam, didn't see a 
> real difference. Being on the bottom of the cowl and to the left, it 
> doesn't get the rotating air from the blades as much.
>
> I know high speed taxi tests in this Florida heat, is probably the 
> worst case scenario. Depending how the morning goes, we might just fly 
> the plane and get some speed into her nose. See at what speed the 
> temperatures stabilize and start to cool down.
>
> - Matt Boiteau
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html

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    <p>Mat,  measurements are not exact as I have a cowl in the way, but
      basically I have 90 sq inches  total air  inlet which is divided
      up 1/3  2/3 between oil and water.  Cubic inches for oil is 8 x 18
      x 2.25 equals 324 cubic inches for oil.  Water is 13 x 20 x 2.25
      giving 585 cubs.</p>
    <p>I find this is just good enough in our 105 degrees F  summer
      heat.  Now in winter it takes 10 minutes to heat the water to 80
      degrees on the thermostat.  Oil is flat to get to 70 degrees, but
      it is only about 60 degrees OAT .  I feel a lot of you blokes seem
      to get away with very small radiators, but My Rad is the smallest
      I would be comfortable with in our summers.</p>
    <p>Will be interesting to see how you go.</p>
    <p>Regards Neil.<br>
    </p>
    <div class="moz-cite-prefix">On 8/15/2019 1:42 PM, Matt Boiteau
      <a class="moz-txt-link-abbreviated" href="mailto:mattboiteau@gmail.com">mattboiteau@gmail.com</a> wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:list-12848207@logan.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div id="__MailbirdStyleContent" style="font-size:
        10pt;font-family: Arial;color: #000000">I'm having a hard time
        in this Florida heat, trying to do my first flight. With a
        highspeed taxi run, (up to 55kts or so), will net my oil and
        coolant above my warning limits. 240 oil pan, 230 coolant out.<br>
        <div><br>
        </div>
        <div>The coolant inlet (44sq") is huge with the idea that down
          the road I'd go turbo. The rad is from a dodge truck 19 x 24 x
          1 = 454sq", with a wedge shape diffuser. Right now it just
          exits the back of the cowl, no cowl flaps or sub cowl
          installed yet.</div>
        <div><br>
        </div>
        <div><span style="font-size: 10pt;line-height: 1.5">The oil
            inlet is a lot smaller (~12.5sq"), going to a 2.5" scat
            hose, then to a trumpet shape which leads into a wedge. The
            oil rad is 9 x 11 x 2 = 198sq" from cx racing. For the
            outlet, I have a big box to collect the hot/expanded air,
            then neck it back down to 2.5" exit. Tomorrow I'll try
            another taxi test, with the outlet box </span>completely<span
            style="font-size: 10pt;line-height: 1.5"> removed and
            dumping into the cowl.</span></div>
        <div><br>
        </div>
        <div>To find out if my prop is doing anything with airflow into
          the inlets, used a tube of water and found around 2200 static
          rpm, it raised the water about 4inches in the oil duct. I
          think that equals around ~55kts. I thought the prop would of
          cooled down the rads a lot more, but I guess I have bad duct
          designs. Maybe move them closer to the blade? Looking at the
          picture, the oil is on the left with all the green tape. I
          tried to make the opening bigger with foam, didn't see a real
          difference. Being on the bottom of the cowl and to the left,
          it doesn't get the rotating air from the blades as much. <br>
          <br>
          I know high speed taxi tests in this Florida heat, is probably
          the worst case scenario. Depending how the morning goes, we
          might just fly the plane and get some speed into her nose. See
          at what speed the temperatures stabilize and start to cool
          down.</div>
        <div><br>
        </div>
        <div class="mb_sig">- Matt Boiteau</div>
      </div>
      <br>
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      <pre class="moz-quote-pre" wrap="">--
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