X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [65.54.250.76] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.7) with ESMTP id 964529 for flyrotary@lancaironline.net; Wed, 01 Feb 2006 23:10:03 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.250.76; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 1 Feb 2006 20:09:16 -0800 Message-ID: Received: from 4.171.114.124 by BAY115-DAV4.phx.gbl with DAV; Thu, 02 Feb 2006 04:09:15 +0000 X-Originating-IP: [4.171.114.124] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Cooling air inlets Date: Wed, 1 Feb 2006 23:09:11 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0094_01C62784.82FC58A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MIMEOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Wed, 1 Feb 2006 23:09:11 -0500 X-OriginalArrivalTime: 02 Feb 2006 04:09:16.0438 (UTC) FILETIME=[6EDC9360:01C627AE] This is a multi-part message in MIME format. ------=_NextPart_000_0094_01C62784.82FC58A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I agree Bill, the challenge of ducting the rad below the engine while = fighting the exhaust system, oil pan, etc for space is greatly = underestimated IMO. The Rad core dims are 18 W x 13 H x 2.625 thick. With good ducting = ,just barely enough I hope. Tracy Tracy, I really believe you will be better off with the round cowl inlets. = What oil cooler are you using there? Powersport never had good cooling = from that lower inlet. They used the firewall mounted radiator with = rather poor ducting. I believe you would have to bottom mount the = radiator and carefully duct it for the lower scoop cooler to work, and = then only with an increase in cooling drag. Bill Jepson=20 PS. What are the dims. on your radiator again? WRJ=20 =20 -----Original Message----- From: Tracy Crook To: Rotary motors in aircraft Sent: Wed, 1 Feb 2006 12:23:12 -0500 Subject: [FlyRotary] Re: Cooling air inlets Not that the purpose built cowl will not work but I felt that fitting = and optimizing all the systems was more straight forward and easier with = the 'classic' cowl. Not shown in the picture is the intake manifold = which is similar to the one in my RV-4. It would stick out the side of = the purpose built cowl. This is just one of many factors. Also, I = think Will James who makes the purpose built cowl was still working out = the rights to market it (it was originally for Powersport) when I got = mine. Tracy ----- Original Message -----=20 From: Greg@itmack=20 To: Rotary motors in = aircraft=20 Sent: Tuesday, January 31, 2006 4:59 PM Subject: [FlyRotary] Re: Cooling air inlets Tracy, just wondering why you went for the "classic" cowl instead of = the Sam James purpose built rotary cowl? Greg Hi John, There are no ballpark figures, only arguments about them : ) FWIW, I am using a Sam James cowl with 5" round inlets and = fervently hope that they will cool my 20B. Tracy (dangerously close to first engine start) ----- Original Message -----=20 From: John = Downing=20 To: Rotary motors in = aircraft=20 Sent: Sunday, January 29, 2006 8:06 PM Subject: [FlyRotary] Cooling air inlets I am modifying the cowling for the Tailwind. The air inlet = holes are 2 5/8"s x 7.5"s for a total of app. 21.5 sq. inches. x 2 for = a total of 43. I am looking at a 5 inch round hole which is the size = that Same James is using for the O-320's, which would make the = diffusers easier to fabricate. The round 5 " hole has approximately = 19.3 sq inches x 2 for 38.6 sq. inches total, if my math is right. Is = this a ball park figure for the water coolers (GM evaporators) on the = Mazda 13 B engine. JohnD -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net/lists/flyrotary/ Attached Image: = 20B_update.jpg=20 [Image removed] ------=_NextPart_000_0094_01C62784.82FC58A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I agree Bill, the challenge of ducting the rad below the engine = while=20 fighting the exhaust system, oil pan, etc for space is greatly=20 underestimated IMO.
 
The Rad core dims are 18 W x 13 H x 2.625 thick.  With = good=20 ducting ,just barely enough I hope.
Tracy
Tracy,
 I really believe you will be better off with the round cowl = inlets.=20 What oil cooler are you using there? Powersport never had good = cooling=20 from that lower inlet. They used the firewall mounted radiator = with=20 rather poor ducting. I believe you would have to bottom mount the = radiator and=20 carefully duct it for the lower scoop cooler to work, and then only = with an=20 increase in cooling drag.
Bill Jepson
PS. What are the dims. on your radiator again?=20 WRJ 
 
-----Original Message-----
From: Tracy = Crook=20 <lors01@msn.com>
To: Rotary motors in aircraft=20 <flyrotary@lancaironline.net>
Sent: Wed, 1 Feb 2006 12:23:12=20 -0500
Subject: [FlyRotary] Re: Cooling air inlets

Not that the purpose built cowl will not work but I felt that = fitting and=20 optimizing all the systems was more straight forward and easier with=20 the 'classic' cowl.  Not shown in the picture is the intake = manifold=20 which is similar to the one in my RV-4.  It would stick out the = side of=20 the purpose built cowl.  This is just one of many = factors.  =20 Also, I think Will James who makes the purpose built cowl was still = working=20 out the rights to market it (it was originally for Powersport) when I = got=20 mine.
 
Tracy
----- Original Message -----
From: Greg@itmack =
To: Rota= ry=20 motors in aircraft
Sent: Tuesday, January 31, = 2006 4:59=20 PM
Subject: [FlyRotary] Re: = Cooling air=20 inlets

Tracy, just wondering why you went for the = "classic"=20 cowl instead of the Sam James purpose built rotary = cowl?
 
Greg

Hi John,
There are no ballpark figures, only arguments about them =  :=20 )
 
FWIW, I am using a Sam James cowl with 5" round inlets=20 and fervently hope that they will cool my 20B.
 
Tracy  (dangerously close to first engine start)
----- Original Message ----- =
From: John=20 Downing
To: Rota= ry=20 motors in aircraft
Sent: Sunday, January 29, = 2006 8:06=20 PM
Subject: [FlyRotary] = Cooling air=20 inlets

I am modifying the cowling for = the=20 Tailwind.  The air inlet holes are 2 5/8"s x 7.5"s for a = total=20 of  app. 21.5 sq. inches. x 2 for a total of 43. =  I am=20 looking at a 5 inch round hole which is the size that Same James = is=20 using for the O-320's,  which would make the diffusers = easier=20 to fabricate.  The round 5 " hole has approximately 19.3 sq = inches x 2 for 38.6 sq. inches total, if my math is = right.  Is=20 this a ball park figure for the water coolers (GM evaporators) = on the=20 Mazda 13 B engine. =20 = JohnD
Attached Image: 20B_update.jpg=20
[Image removed]
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