X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ispmxmta05-srv.windstream.net ([166.102.165.166] verified) by logan.com (CommuniGate Pro SMTP 5.2.1) with ESMTP id 2844913 for flyrotary@lancaironline.net; Sat, 12 Apr 2008 13:48:46 -0400 Received-SPF: pass receiver=logan.com; client-ip=166.102.165.166; envelope-from=jskmberki@alltel.net Received: from ispmxaamta08-gx.windstream.net ([71.29.110.122]) by ispmxmta05-srv.windstream.net with ESMTP id <20080412174804.CUWW9682.ispmxmta05-srv.windstream.net@ispmxaamta08-gx.windstream.net> for ; Sat, 12 Apr 2008 12:48:04 -0500 Received: from joehomepc ([71.29.110.122]) by ispmxaamta08-gx.windstream.net with SMTP id <20080412174803.OHXY12888.ispmxaamta08-gx.windstream.net@joehomepc> for ; Sat, 12 Apr 2008 12:48:03 -0500 Message-ID: <007e01c89cc6$61d006e0$01fea8c0@joehomepc> From: "Joe Berki" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: adding a tubing bead Date: Sat, 12 Apr 2008 13:55:23 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_007B_01C89CA4.DA5E1E70" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1914 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1914 This is a multi-part message in MIME format. ------=_NextPart_000_007B_01C89CA4.DA5E1E70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable JBWeld? ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Saturday, April 12, 2008 10:55 AM Subject: [FlyRotary] Re: adding a tubing bead Subject: [FlyRotary] Re: adding a tubing bead Al, you could do like Tracy did on his original, wrap a string = coated with epoxy around the tube. I hope that idea it still works, as = I did mine that way. JohnD Yes; but what epoxy? Most epoxies lose strength rapidly above about = 150F. What keeps the bead in place at 210F when the pressure is the = highest? You would want to use an epoxy that was good to 300F. Whether it works depends on the connection configuration. Just = consider the x-sectional area of the connection, the expected pressure, = and the constraints counteracting the force. Some connections don't need = a bead at all. A short coupling hose in a straight line where things = are constrained at both ends needs no bead. The pressure forces offset. = A longer hose with a 90 degree bend needs a bead or the pressure will = blow the hose off the connection. Just some rambling thoughts . . =20 Al -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG.=20 Version: 7.5.519 / Virus Database: 269.22.12/1374 - Release Date: = 4/11/2008 4:59 PM ------=_NextPart_000_007B_01C89CA4.DA5E1E70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
JBWeld?
----- Original Message -----
From:=20 Al = Gietzen=20
Sent: Saturday, April 12, 2008 = 10:55=20 AM
Subject: [FlyRotary] Re: adding = a tubing=20 bead

Subject:=20 [FlyRotary] Re: adding a tubing bead

 

Al, you could do like=20 Tracy did on=20 his original, wrap a string coated with epoxy around the tube.  = I hope=20 that idea it still works, as I did mine that way. =20 JohnD

Yes; = but what=20 epoxy?  Most epoxies lose strength rapidly above about = 150F.  What=20 keeps the bead in place at 210F when the pressure is the = highest?  You=20 would want to use an epoxy that was good to 300F.

 

Whether = it works=20 depends on the connection configuration.  Just consider the = x-sectional=20 area of the connection, the expected pressure, and the constraints=20 counteracting the force. Some connections don=92t need a bead at = all.  A=20 short coupling hose in a straight line where things are constrained = at both=20 ends needs no bead. The pressure forces offset. A longer hose with a = 90=20 degree bend needs a bead or the pressure will blow the hose off the=20 connection.

 

Just = some=20 rambling thoughts  . . 

 

Al

 

 

No virus found in this incoming message.
Checked by AVG.=20
Version: 7.5.519 / Virus Database: 269.22.12/1374 - Release Date:=20 4/11/2008 4:59 PM
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