X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2783261 for flyrotary@lancaironline.net; Sat, 08 Mar 2008 14:10:52 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([75.191.186.236]) by cdptpa-omta01.mail.rr.com with SMTP id <20080308191011.KHAO10595.cdptpa-omta01.mail.rr.com@edward2> for ; Sat, 8 Mar 2008 19:10:11 +0000 Message-ID: <002801c88150$0ef875b0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Emailing: Inclinded Radiators.doc Date: Sat, 8 Mar 2008 14:10:22 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0025_01C88126.25E20950" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0025_01C88126.25E20950 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sorry, Al, there was not any more to be had out of that document. I can = understand that all angles of inclination may not be equal - in heat = transfer or drag, but must admit I was surprised to find that 55deg = supposedly provided 30% more heat transfer and 20% less drag than one = perpendicular to the air flow. It would be interesting to find out the = source of such a conclusion - I mean the graph looks like it comes from = somewhere{:>) Ed ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Saturday, March 08, 2008 11:22 AM Subject: [FlyRotary] Re: Emailing: Inclinded Radiators.doc Ed; With admittedly only a few minutes of study; I wouldn't draw any = conclusion from that report - other than for that particular duct = design, inclining the rad to a certain point resulted in better flow = characteristics. Perhaps a 'correct' design with a straight thru flow = would be even better. Al -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] = On Behalf Of Ed Anderson Sent: Saturday, March 08, 2008 7:13 AM To: Rotary motors in aircraft Subject: [FlyRotary] Emailing: Inclinded Radiators.doc Here is an extract out of an article on race car cooling that is very = interesting about use of inclined radiators. Unfortunately, I could not = find any reference as to where this information was derived from - but, = if correct, is fairly significant. It basically states that inclining a radiator from 0 deg to 20-30 deg = will decrease cooling and increase drag - not terribly surprising, = however, the article continues saying that at approx. 55 dig of = inclination the cooling effectiveness is 30% greater than a radiator = with no inclination and the drag is 20% less!!! Now I found that = surprising - but, then air flow does take surprising twists (no pun = intended). While I find that claim very interesting - I have not found any = collaborating documents. But, thought the group might find it = interesting For your information Ed The message is ready to be sent with the following file or link = attachments: Inclined Radiators.doc Note: To protect against computer viruses, e-mail programs may prevent = sending or receiving certain types of file attachments. Check your = e-mail security settings to determine how attachments are handled. ------=_NextPart_000_0025_01C88126.25E20950 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Sorry, Al, there was not any more to be had out = of that=20 document.  I can understand that all angles of inclination may not = be equal=20 - in heat transfer or drag, but must admit I was surprised to find that = 55deg=20 supposedly provided 30% more heat transfer and 20% less drag than one=20 perpendicular to the air flow.  It would be interesting to find out = the=20 source of such a conclusion - I mean the graph looks like it comes from=20 somewhere{:>)
 
 
Ed
----- Original Message -----
From:=20 Al = Gietzen=20
Sent: Saturday, March 08, 2008 = 11:22=20 AM
Subject: [FlyRotary] Re: = Emailing:=20 Inclinded Radiators.doc

Ed;

With = admittedly=20 only a few minutes of study; I wouldn=92t draw any conclusion from = that report =96=20 other than for that particular duct design, inclining the rad to a = certain=20 point resulted in better flow characteristics.  Perhaps a = =91correct=92=20 design with a straight thru flow would be even = better.

 

Al

 

-----Original=20 Message-----
From: = Rotary=20 motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed = Anderson
Sent: Saturday, March 08, 2008 = 7:13=20 AM
To: Rotary = motors in=20 aircraft
Subject: = [FlyRotary]=20 Emailing: Inclinded Radiators.doc

 

Here is an extract out = of an=20 article on race car cooling that is very interesting about use of = inclined=20 radiators.  Unfortunately, I could not find any reference as to = where=20 this information was derived from - but, if correct, is fairly=20 significant.

 

It basically states that = inclining=20 a radiator from 0 deg to 20-30 deg will decrease cooling and increase = drag -=20 not terribly surprising, however, the article continues saying that at = approx.=20 55 dig of inclination the cooling effectiveness is 30% greater than a = radiator=20 with no inclination and the drag is 20% less!!!  Now I found that = surprising - but, then air flow does take surprising twists (no pun=20 intended).

 

While I find that=20 claim very interesting - I have not found any collaborating=20 documents.  But, thought the group might find it=20 interesting

 

For your=20 information

 

Ed

 

 

The message is ready to be = sent with the=20 following file or link attachments:
Inclined = Radiators.doc

Note: To=20 protect against computer viruses, e-mail programs may prevent sending = or=20 receiving certain types of file attachments.  Check your e-mail = security=20 settings to determine how attachments are=20 handled.

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