X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mx2.netapp.com ([216.240.18.37] verified) by logan.com (CommuniGate Pro SMTP 5.3.6) with ESMTPS id 4240080 for flyrotary@lancaironline.net; Wed, 28 Apr 2010 10:22:41 -0400 Received-SPF: softfail receiver=logan.com; client-ip=216.240.18.37; envelope-from=echristley@nc.rr.com X-IronPort-AV: E=Sophos;i="4.52,288,1270450800"; d="scan'208";a="351533664" Received: from smtp1.corp.netapp.com ([10.57.156.124]) by mx2-out.netapp.com with ESMTP; 28 Apr 2010 07:21:48 -0700 Received: from [10.62.16.108] (ernestc-laptop.hq.netapp.com [10.62.16.108]) by smtp1.corp.netapp.com (8.13.1/8.13.1/NTAP-1.6) with ESMTP id o3SELmCb013455 for ; Wed, 28 Apr 2010 07:21:48 -0700 (PDT) Message-ID: <4BD84475.3090206@nc.rr.com> Date: Wed, 28 Apr 2010 10:21:41 -0400 From: Ernest Christley Reply-To: echristley@nc.rr.com User-Agent: Thunderbird 2.0.0.24 (X11/20100317) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Eductor scavenging of radiator outlet, WAS 20B RV-8 cooling results References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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.