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From: "Chris Owens - Rotary" <rotary@cmowens.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: re: [FlyRotary] Re: Eductor scavenging of radiator outlet, WAS 20B RV-8 cooling results
Date: Wed, 28 Apr 2010 07:30:57 -0700
Reply-To: rotary@cmowens.com
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Ah yes, I see.  I'll need to do some searching through the archives 
regarding exhaust augmentation.  Pretty intriguing stuff!

Thanks for the additional info.

~Chris

----------------------------------------
 From: "Ernest Christley" <echristley@nc.rr.com>
Sent: Wednesday, April 28, 2010 9:23 AM
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Eductor scavenging of radiator outlet, WAS 20B 
RV-8 cooling results

Chris Owens - Rotary wrote:
> You know, I don't know if this has been discussed, but the whole 
> pressure differential thing got me thinking of something that I'm 
> surprised I hadn't thought of earlier. Since the draw of air via low 
> pressure on the output side seems to be key, I wonder if an eductor 
> type of scenario would work.
>
> Back in my Navy days, we used to use a device called an in-line 
> eductor for dewatering flooded spaces. Similar to a venturi, more or 
> less, you pumped water through it, it created a suction, and it was 
> designed to suck as much water through it as you put into it. 100 
> gallons per minute input would dewater at 100 gallons per minute with 
> 200 gallons per minute flowing through the output. A representative 
> device is here (perhaps not for fluid use, but the concept is similar):
>
> http://www.1877eductors.com/eductor_gas_dimensions.htm
>
> I presume a similar approach could be taken with a radiator setup, 
> would you think? I imagine it would work well for a center mounted 
> radiator with a centerline, below-the-nose scoop, so one could utilize 
> the cheek inlets to provide source air for the outlet side.
>
> ~Chris
Chris, that is what an exhaust augmenter does. The engine's exhaust 
goes into point D in your drawing. It is accelerated through the 
dimension B, and leaves a slight vacuum which pulls the other fluid in 
through E. The exhaust augmenter simply eliminates the structure needed 
to connect a hose to point E.

--
Homepage: http://www.flyrotary.com/
Archive and UnSub: 
http://mail.lancaironline.net:81/lists/flyrotary/List.html



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<span style=3D"font-family: Arial, Helvetica, sans-serif; font-size: 10pt">=
Ah yes, I see.&nbsp; I'll need to do some searching through the archives re=
garding exhaust augmentation.&nbsp; Pretty intriguing stuff!<br />
<br />
Thanks for the additional info.<br />
<br />
~Chris<br />
<div id=3D"divSignature"></div>
<br />
<br />
<span style=3D"font-family: tahoma,arial,sans-serif; font-size: 10pt;"><hr =
width=3D"100%" size=3D"2" align=3D"center" />
<b>From</b>: "Ernest Christley" &lt;echristley@nc.rr.com&gt;<br />
<b>Sent</b>: Wednesday, April 28, 2010 9:23 AM<br />
<b>To</b>: "Rotary motors in aircraft" &lt;flyrotary@lancaironline.net&gt;<=
br />
<b>Subject</b>: [FlyRotary] Re: Eductor scavenging of radiator outlet, WAS =
20B RV-8 cooling results</span><br />
<br />
Chris Owens - Rotary wrote:<br />
&gt; You know, I don't know if this has been discussed, but the whole <br /=
>
&gt; pressure differential thing got me thinking of something that I'm <br =
/>
&gt; surprised I hadn't thought of earlier. Since the draw of air via low <=
br />
&gt; pressure on the output side seems to be key, I wonder if an eductor <b=
r />
&gt; type of scenario would work.<br />
&gt;<br />
&gt; Back in my Navy days, we used to use a device called an in-line <br />
&gt; eductor for dewatering flooded spaces. Similar to a venturi, more or <=
br />
&gt; less, you pumped water through it, it created a suction, and it was <b=
r />
&gt; designed to suck as much water through it as you put into it. 100 <br =
/>
&gt; gallons per minute input would dewater at 100 gallons per minute with =
<br />
&gt; 200 gallons per minute flowing through the output. A representative <b=
r />
&gt; device is here (perhaps not for fluid use, but the concept is similar)=
:<br />
&gt;<br />
&gt; http://www.1877eductors.com/eductor_gas_dimensions.htm<br />
&gt;<br />
&gt; I presume a similar approach could be taken with a radiator setup, <br=
 />
&gt; would you think? I imagine it would work well for a center mounted <br=
 />
&gt; radiator with a centerline, below-the-nose scoop, so one could utilize=
 <br />
&gt; the cheek inlets to provide source air for the outlet side.<br />
&gt;<br />
&gt; ~Chris<br />
Chris, that is what an exhaust augmenter does. The engine's exhaust <br />
goes into point D in your drawing. It is accelerated through the <br />
dimension B, and leaves a slight vacuum which pulls the other fluid in <br =
/>
through E. The exhaust augmenter simply eliminates the structure needed <br=
 />
to connect a hose to point E.<br />
<br />
--<br />
Homepage: http://www.flyrotary.com/<br />
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.ht=
ml<br />
<br /></span>

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