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 2783496 for flyrotary@lancaironline.net; Sat, 08 Mar 2008 19:49:47 -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-omta06.mail.rr.com with SMTP id <20080309004908.RTGZ14418.cdptpa-omta06.mail.rr.com@edward2> for ; Sun, 9 Mar 2008 00:49:08 +0000 Message-ID: <001401c8817f$693e0100$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Emailing: Inclinded Radiators.doc Date: Sat, 8 Mar 2008 19:49:20 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0011_01C88155.802794A0" 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_0011_01C88155.802794A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ok, Al, got your point this time. If poor to start with then any = improvement might look great but be substantially less than a good = installation to begin with. The inlet does look more like the old = "traditional" sinusoidal inlets( which we know are about the worst you = could choose) rather than say - a "Streamline Duct". Ed ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Saturday, March 08, 2008 6:30 PM Subject: [FlyRotary] Re: Emailing: Inclinded Radiators.doc 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. Ed; I didn't mean to imply that they were 'making it up'. I can believe = that that is what they actually measured. From the drawing it appears = that the diffuser section is what K & W called 'old style'; so with the = rad perpendicular there may have been flow separation or whatever; IOW = poor pressure recovery. Inclining the rad increased the pressure drop, = and at some point the flow stayed attached and everything worked great - = you see what I'm getting at. Too many other variables. It's like a one = person testimonial on a health food supplement - "Oh, yeah; it cured my = cancer, my athletes foot and bad breath; I swear by the stuff". And = actual data shows it doesn't do anything. Al=20 ------=_NextPart_000_0011_01C88155.802794A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ok, Al, got your point this time.  If = poor to=20 start with then any improvement might look great but be substantially = less than=20 a good installation to begin with.  The inlet does look more like = the old=20 "traditional" sinusoidal inlets( which we know are about the worst you = could=20 choose) rather than say - a "Streamline Duct".
 
Ed
----- Original Message -----
From:=20 Al = Gietzen=20
Sent: Saturday, March 08, 2008 = 6:30=20 PM
Subject: [FlyRotary] Re: = Emailing:=20 Inclinded Radiators.doc

 

Sorry, Al, there was not = any more=20 to be had out of that document.  I can understand that all angles = of=20 inclination may not be equal - in heat transfer or drag, but must = admit I was=20 surprised to find that 55deg supposedly provided 30% more heat = transfer and=20 20% less drag than one perpendicular to the air flow.  It would = be=20 interesting to find out the source of such a conclusion - I mean the = graph=20 looks like it comes from somewhere{:>)

  Ed.

Ed;

I = didn=92t mean to=20 imply that they were =91making it up=92.  I can believe that that = is what=20 they actually measured. From the drawing it appears that the diffuser = section=20 is what K & W called =91old style=92; so with the rad = perpendicular there may=20 have been flow separation or whatever; IOW poor pressure = recovery. =20 Inclining the rad increased the pressure drop, and at some point the = flow=20 stayed attached and everything worked great =96 you see what I=92m = getting=20 at.  Too many other variables.  It=92s like a one person = testimonial=20 on a health food supplement =96 =93Oh, yeah; it cured my cancer, my = athletes foot=20 and bad breath; I swear by the stuff=94.  And actual data shows = it doesn=92t=20 do anything.

 

Al=20

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