Return-Path: Received: from relay04.roc.ny.frontiernet.net ([66.133.131.37] verified) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2625575 for flyrotary@lancaironline.net; Mon, 06 Oct 2003 01:09:46 -0400 Received: (qmail 10143 invoked from network); 6 Oct 2003 05:09:39 -0000 Received: from unknown (HELO frontiernet.net) ([170.215.97.8]) (envelope-sender ) by relay04.roc.ny.frontiernet.net (FrontierMTA 2.3.6) with SMTP for ; 6 Oct 2003 05:09:39 -0000 Message-ID: <3F80EBBF.D43AE183@frontiernet.net> Date: Mon, 06 Oct 2003 00:12:47 -0400 From: Jim Sower X-Mailer: Mozilla 4.77 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Thick Vs Thin Radiators - NASCAR References: Content-Type: multipart/alternative; boundary="------------81190946E25037128A96344D" --------------81190946E25037128A96344D Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Ed, <... Did this help or did I just make it more confusing ...> Once again we find ourselves in "violent agreement" ... :o) In your crude "box" plenum, (or any design with too sharp corners) when the air couldn't negotiate the turn, it separated, became a turbulent eddy and stopped going anywhere or doing anything useful. Smoothing out your ramps reduced inlet from 24 square inches to 8-9. That's 2/3!! A HUGE savings in cooling drag. That is what I was trying to get across. Merely delivering air to the radiator face is not enough. We have to deliver it in a sufficiently organized manner to enable it to work as efficiently as it can. I know 7 deg is hard to achieve in our limited space, but my objective is to have everyone giving it their very best shot at 7 deg, and accepting what they end up with as the best package they can make, rather than just hanging radiators out in the sky. I was surprised that it was only 7 deg. I expected more like 20 .... Jim S. --------------81190946E25037128A96344D Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Ed,
<... Did this help or did I just make it more confusing ...>
Once again we find ourselves in "violent agreement" ... :o)
In your crude "box" plenum, (or any design with too sharp corners) when the air couldn't negotiate the turn, it separated, became a turbulent eddy and stopped going anywhere or doing anything useful. Smoothing out your ramps reduced inlet from 24 square inches to 8-9. That's 2/3!! A HUGE savings in cooling drag. That is what I was trying to get across. Merely delivering air to the radiator face is not enough. We have to deliver it in a sufficiently organized manner to enable it to work as efficiently as it can. I know 7 deg is hard to achieve in our limited space, but my objective is to have everyone giving it their very best shot at 7 deg, and accepting what they end up with as the best package they can make, rather than just hanging radiators out in the sky.

I was surprised that it was only 7 deg. I expected more like 20 .... Jim S.

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