X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Received: from smtp114.sbc.mail.re2.yahoo.com ([68.142.229.91] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with SMTP id 1870381 for flyrotary@lancaironline.net; Mon, 26 Feb 2007 20:54:38 -0500 Received-SPF: none receiver=logan.com; client-ip=68.142.229.91; envelope-from=downing.j@sbcglobal.net Received: (qmail 82565 invoked from network); 27 Feb 2007 01:53:30 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=sbcglobal.net; h=Received:X-YMail-OSG:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=LTKN5aobpVAWImn1rxg9C1N+RfwLwMGht5ndVrTCT1j/OPiPMZOmNhnmg06KcJYCeJHdq0qm0OtzIFTJ+3aEYEWUuXcVTpnbV+V05IuanlZ4kPAApF9S/CGp1zIKHdfWbiBjXfHjcSiv3/2yh79ySMATotZ+YUiazKG+MVVgKiM= ; Received: from unknown (HELO mom) (downing.j@sbcglobal.net@75.40.224.46 with login) by smtp114.sbc.mail.re2.yahoo.com with SMTP; 27 Feb 2007 01:53:30 -0000 X-YMail-OSG: oETILxIVM1kHFS3eBxUnuUDCAsfk9bWlQKHD0NJZStLuf3cnX0ZTQ8RM_y4Uq2gBvzRqu2A.jiubec1YreSmZjwlhUxMNVMNyMJ.D0xy9dnmpZQumuR2SV5nwV843ZC22Zo9HMg0EwGND7k- Message-ID: <008801c75a12$2255ada0$4001a8c0@gateway.2wire.net> From: "John Downing" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: cowl openings for water radiators Date: Mon, 26 Feb 2007 20:53:52 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0085_01C759E8.38F95EA0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_0085_01C759E8.38F95EA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ed, is there some particular reason that you necked the inlet down = small, then enlarged it again. Thankyou for the pictures. JohnD ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Monday, February 26, 2007 3:39 PM Subject: [FlyRotary] Re: cowl openings for water radiators John, don't know if these photos will help. But, like you I only have = between 3 and 6" of duct distance on the radiators. You should do Ok = with 20 sq inch on each opening with a good diffuser/duct. Attached are = some photos of my current ducts. The openings are 18 sq inches each. I = have had one opening down to as little as 10 square inches - but that = was a bit marginal - so opened it back up. I have a generous exit area = for the hot air including a larger 4" x 12" bottom opening as well as = louvers on each side of the cowl. So you mileage could vary - but Tracy = has essentially the same size opening as well as several others. Ed ----- Original Message -----=20 From: John Downing=20 To: Rotary motors in aircraft=20 Sent: Monday, February 26, 2007 12:12 PM Subject: [FlyRotary] cowl openings for water radiators What size openings do I need for the water radiators? The Wittman = Tailwind cowl I have has postal slots of 3' x 7 3/4" , which is = approx. 22 1/4 sq in. on each side. Sam James for the 160 Lycoming is = using 4 3/4' round holes which are 17.6 sq. inches on each side. My = radiators are quite close to the opening and I plan on making the = diffusers trumpet shaped, will the openings be large enough if I can = stay over 20 sq. inches on each side with a decent trumpet shape. JohnD = hushpowere II on order - hope to start in 2 weeks if weather = cooperates. -------------------------------------------------------------------------= --- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ -------------------------------------------------------------------------= ----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_0085_01C759E8.38F95EA0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ed, is there some particular reason = that you necked=20 the inlet down small, then enlarged it again.  Thankyou for the=20 pictures.  JohnD
----- Original Message -----
From:=20 Ed=20 Anderson
Sent: Monday, February 26, 2007 = 3:39=20 PM
Subject: [FlyRotary] Re: cowl = openings=20 for water radiators

John, don't know if these photos will = help.  But,=20 like you I only have between 3 and 6" of duct distance on the = radiators. =20 You should do Ok with 20 sq inch on each opening with a good=20 diffuser/duct.  Attached are some photos of my current = ducts.  The=20 openings are 18 sq inches each.  I have had one opening down to = as little=20 as 10 square inches - but that was a bit marginal - so opened it back=20 up.  I have a generous exit area for the hot air including a = larger 4" x=20 12" bottom opening as well as louvers on each side of the cowl.  = So you=20 mileage could vary - but Tracy has essentially the same size opening = as well=20 as several others.
 
Ed
----- Original Message -----
From:=20 John=20 Downing
To: Rotary motors in = aircraft=20
Sent: Monday, February 26, = 2007 12:12=20 PM
Subject: [FlyRotary] cowl = openings for=20 water radiators

What size openings do I need for = the water=20 radiators?   The Wittman Tailwind cowl I have has postal = slots of=20 3' x 7 3/4" , which is   approx. 22 1/4 sq in. on each = side. =20 Sam James for the 160 Lycoming is using 4 3/4' round holes which are = 17.6=20 sq. inches on each side.  My radiators are quite close to the = opening=20 and I plan on making the diffusers trumpet shaped, will the openings = be=20 large enough if I can stay over 20 sq. inches on each side with a = decent=20 trumpet shape.  JohnD      =20 hushpowere II on order - hope to start in 2 weeks if weather=20 cooperates.

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