X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao101.cox.net ([68.230.241.45] verified) by logan.com (CommuniGate Pro SMTP 5.2.1) with ESMTP id 2844968 for flyrotary@lancaironline.net; Sat, 12 Apr 2008 14:13:21 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.45; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao101.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20080412181240.EWLX9874.fed1rmmtao101.cox.net@fed1rmimpo02.cox.net> for ; Sat, 12 Apr 2008 14:12:40 -0400 Received: from BigAl ([72.192.137.74]) by fed1rmimpo02.cox.net with bizsmtp id CiCh1Z0051cVYgg04iChov; Sat, 12 Apr 2008 14:12:41 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: adding a tubing bead Date: Sat, 12 Apr 2008 10:16:11 -0800 Message-ID: <000201c89cc9$49cd73e0$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0003_01C89C86.3BAA33E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0003_01C89C86.3BAA33E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable JBWeld? =20 Hum-m-m; that should work. =20 Al ----- 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 =20 Subject: [FlyRotary] Re: adding a tubing bead =20 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. =20 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. =20 Just some rambling thoughts . . =20 =20 Al =20 =20 _____ =20 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_0003_01C89C86.3BAA33E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

JBWeld?

 

Hum-m-m; that should = work.

 

Al

=

----- Original Message = -----

From: Al = Gietzen

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  . . 

 

Al

 

 

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

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