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

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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.

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