X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Received: from alnrmhc12.comcast.net ([204.127.225.92] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1871351 for flyrotary@lancaironline.net; Tue, 27 Feb 2007 08:35:48 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.225.92; envelope-from=wschertz@comcast.net Received: from 7n7z201 (c-24-7-194-231.hsd1.il.comcast.net[24.7.194.231]) by comcast.net (alnrmhc12) with SMTP id <20070227133447b12009b5c7e>; Tue, 27 Feb 2007 13:34:58 +0000 Message-ID: <00a401c75a74$0d0b50a0$e7c20718@7n7z201> From: "Bill Schertz" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: cowl openings for water radiators Date: Tue, 27 Feb 2007 07:34:37 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A1_01C75A41.BC0189E0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_00A1_01C75A41.BC0189E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The pour foam came from Wicks or Aircraft Spruce. When it is hardened, = it sands easily. (still messy) Bill Schertz KIS Cruiser # 4045 ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Tuesday, February 27, 2007 6:44 AM Subject: [FlyRotary] Re: cowl openings for water radiators Hey, Bill. Neat approach to shaping the duct. I end up rasping and = cutting foam blocks to the my shape - lots of mess. I tried your = approach once with local insulation type foaming stuff - did not work = well at all. So what brand of pour foam did you use. Thanks Ed ----- Original Message -----=20 From: Bill Schertz=20 To: Rotary motors in aircraft=20 Sent: Tuesday, February 27, 2007 12:35 AM Subject: [FlyRotary] Re: cowl openings for water radiators John, can't answer your question on size of opening from operating = experience, but Ed Anderson's results indicate that you should be okay. I am enclosing some pictures of the technique I used to make the = trumpet shapes and have them mount to the radiators and meet the cowl = openings. 1. Cut a piece of cardboard the size of the active area of the = exchangers, and tape it in place 2. Cut a piece that fits in the cowl opening, then cut a small foam = block to fit between the two. Cut and try, sand to fit. Hot glue them = together. This is shown in pics P6130001 and 2 3. Remove them from the plane and you end up with P6130003, with the = cardboard pieces reflecting the planes of each opening. Make a box = coated with packing tape around each assembly, and pour in some = pour-foam. 4. After it hardens, you can remove the box, and sand the foam to = the appropriate shape P6160004 is part done, then P6210011 shows them = coated with micro ready for fiberglass layup. Bill Schertz KIS Cruiser # 4045 ----- Original Message -----=20 From: John Downing=20 To: Rotary motors in aircraft=20 Sent: Monday, February 26, 2007 11:12 AM 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_00A1_01C75A41.BC0189E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
The pour foam came from Wicks or = Aircraft Spruce.=20 When it is hardened, it sands easily. (still messy)
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
From:=20 Ed=20 Anderson
Sent: Tuesday, February 27, = 2007 6:44=20 AM
Subject: [FlyRotary] Re: cowl = openings=20 for water radiators

Hey, Bill.  Neat approach to shaping the=20 duct.  I end up rasping and cutting foam blocks to the my shape - = lots of=20 mess.  I tried your approach once with local insulation type = foaming=20 stuff - did not work well at all.  So what brand of pour foam did = you=20 use.
 
Thanks
 
Ed
----- Original Message -----
From:=20 Bill=20 Schertz
To: Rotary motors in = aircraft=20
Sent: Tuesday, February 27, = 2007 12:35=20 AM
Subject: [FlyRotary] Re: cowl = openings=20 for water radiators

John, can't answer your question on = size of=20 opening from operating experience, but Ed Anderson's results = indicate that=20 you should be okay.
 
I am enclosing some pictures of the = technique I=20 used to make the trumpet shapes and have them mount to the radiators = and=20 meet the cowl openings.
 
1. Cut a piece of cardboard the = size of the=20 active area of the exchangers, and tape it in place
2. Cut a piece that fits in the = cowl opening,=20 then cut a small foam block to fit between the two. Cut and try, = sand to=20 fit. Hot glue them together. This is shown in pics P6130001 and=20 2
 
3. Remove them from the plane and = you end up=20 with P6130003, with the cardboard pieces reflecting the planes of = each=20 opening. Make a box coated with packing tape around each assembly, = and pour=20 in some pour-foam.
 
4. After it hardens, you can remove = the box,=20 and sand the foam to the appropriate shape P6160004 is part done, = then=20 P6210011 shows them coated with micro ready for fiberglass=20 layup.
Bill Schertz
KIS Cruiser # 4045
----- Original Message ----- =
From:=20 John Downing
To: Rotary motors in = aircraft=20
Sent: Monday, February 26, = 2007 11:12=20 AM
Subject: [FlyRotary] cowl = openings=20 for water radiators

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

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Homepage:  http://www.flyrotary.com/
Archive = and=20 UnSub:  =20 http://mail.lancaironline.net/lists/flyrotary/

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