X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from nk11p08mm-asmtp002.mac.com ([17.158.58.247] verified) by logan.com (CommuniGate Pro SMTP 6.0) with ESMTP id 5967163 for flyrotary@lancaironline.net; Mon, 24 Dec 2012 19:51:07 -0500 Received-SPF: pass receiver=logan.com; client-ip=17.158.58.247; envelope-from=steveizett@me.com MIME-version: 1.0 Content-type: multipart/alternative; boundary="Boundary_(ID_eMcT8FLcq08C9pZvJPnRiw)" Received: from [10.1.1.6] (58-7-170-26.dyn.iinet.net.au [58.7.170.26]) by nk11p08mm-asmtp002.mac.com (Oracle Communications Messaging Server 7u4-26.01(7.0.4.26.0) 64bit (built Jul 13 2012)) with ESMTPSA id <0MFK00IIUAC50U90@nk11p08mm-asmtp002.mac.com> for flyrotary@lancaironline.net; Tue, 25 Dec 2012 00:50:32 +0000 (GMT) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.9.8327,1.0.431,0.0.0000 definitions=2012-12-24_07:2012-12-24,2012-12-24,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 ipscore=0 suspectscore=2 phishscore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=6.0.2-1203120001 definitions=main-1212240304 From: Stephen Izett Subject: Re: [FlyRotary] Re: Cooling Duct design Date: Tue, 25 Dec 2012 08:50:28 +0800 In-reply-to: To: Rotary motors in aircraft References: Message-id: <64E43C9D-6C09-4F48-894E-D5896CF0AEFE@me.com> X-Mailer: Apple Mail (2.1283) --Boundary_(ID_eMcT8FLcq08C9pZvJPnRiw) Content-type: text/plain; CHARSET=US-ASCII Content-transfer-encoding: 7BIT Thanks Mark for the feedback Steve On 24/12/2012, at 11:12 PM, Mark Steitle wrote: > Hi Steve, > > Referring to the top view drawing, my guess is the majority of the air would favor the top half of the core, starving the other half of air. I think I would try to duplicate the long curved duct wall on both sides, forming a trumpet shape nearest the core. On the side-view drawing, my guess is the majority of the cooling air would pile up on the back/downwind side. I would squeeze it down to almost nothing at the backside. Then take some manometer readings and adjust as appropriate. > > Be sure you have free space behind the radiator for the air to exit the core, and adequate cowl opening(s). I had to add a cowl flap to my Lancair, but it really helps during hot weather climb-outs. When up into cooler air I usually close the cowl flap for reduced cooling drag. > > Mark S. > Lancair ES - PP 20B - 258 hrs > > On Mon, Dec 24, 2012 at 1:32 AM, Stephen Izett wrote: > Hi Guys > > I'm about to construct the diffuser for the water exchanger. > Can some of you guys with operating setups critique the design please. > So it consists of a K&Mish diffuser followed by a wedge. > > > > And a happy Christmas to you all. > > Steve Izett > Perth Western Australia > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html > > --Boundary_(ID_eMcT8FLcq08C9pZvJPnRiw) Content-type: text/html; CHARSET=US-ASCII Content-transfer-encoding: 7BIT Thanks Mark for the feedback

Steve
On 24/12/2012, at 11:12 PM, Mark Steitle wrote:

Hi Steve, 

Referring to the top view drawing, my guess is the majority of the air would favor the top half of the core, starving the other half of air.  I think I would try to duplicate the long curved duct wall on both sides, forming a trumpet shape nearest the core.  On the side-view drawing, my guess is the majority of the cooling air would pile up on the back/downwind side.  I would squeeze it down to almost nothing at the backside.  Then take some manometer readings and adjust as appropriate.  

Be sure you have free space behind the radiator for the air to exit the core, and adequate cowl opening(s).  I had to add a cowl flap to my Lancair, but it really helps during hot weather climb-outs.  When up into cooler air I usually close the cowl flap for reduced cooling drag.

Mark S.
Lancair ES - PP 20B - 258 hrs   

On Mon, Dec 24, 2012 at 1:32 AM, Stephen Izett <steveizett@me.com> wrote:
Hi Guys

I'm about to construct the diffuser for the water exchanger.
Can some of you guys with operating setups critique the design please.
So it consists of a K&Mish diffuser followed by a wedge.



And a happy Christmas to you all.

Steve Izett
Perth Western Australia

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