X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-mb01.mx.aol.com ([64.12.207.164] verified) by logan.com (CommuniGate Pro SMTP 5.4c2a) with ESMTP id 4842644 for flyrotary@lancaironline.net; Tue, 08 Feb 2011 15:04:47 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.207.164; envelope-from=Lehanover@aol.com Received: from imo-ma04.mx.aol.com (imo-ma04.mx.aol.com [64.12.78.139]) by imr-mb01.mx.aol.com (8.14.1/8.14.1) with ESMTP id p18K45OL028148 for ; Tue, 8 Feb 2011 15:04:05 -0500 Received: from Lehanover@aol.com by imo-ma04.mx.aol.com (mail_out_v42.9.) id q.eb2.ecf5892 (34952) for ; Tue, 8 Feb 2011 15:04:00 -0500 (EST) Received: from magic-d19.mail.aol.com (magic-d19.mail.aol.com [172.19.155.135]) by cia-da06.mx.aol.com (v129.8) with ESMTP id MAILCIADA061-88884d51a1b027c; Tue, 08 Feb 2011 15:04:00 -0500 From: Lehanover@aol.com Message-ID: <465d1.167f130a.3a82fbaf@aol.com> Date: Tue, 8 Feb 2011 15:03:59 EST Subject: Re: [FlyRotary] Header slip joints To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_465d1.167f130a.3a82fbaf_boundary" X-Mailer: 9.0 Security Edition for Windows sub 5382 X-AOL-IP: 72.187.199.116 X-Spam-Flag:NO X-AOL-SENDER: Lehanover@aol.com --part1_465d1.167f130a.3a82fbaf_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 2/8/2011 1:15:46 P.M. Eastern Standard Time, jskmberki@windstream.net writes: I placed 2 slip joints in each of the header runners. Can the slip joint movement be maintained? Can anything be applied to the slip joint to ensure that it does not bind up? Thanks for any help Joe Berki Limo EZ The forces generated when a nest of snakes header system is welded up tight, like a street header for a V-8 where 4 headers are welded into a collector are immense. And so usually crack in a few years, and at very low temperatures. In racing that 4 into one header has pipes that slip into the collector and even though they fit snugly are not able to generate enough force to crack themselves. I have Inconel headers from Indy cars built just like that. This allows the header pipes to be made so thin that they are discarded after 3 heat cycles. Probably not a good practice for airplanes. If the slip joint is not so tight that it needs extensive hammering to get it together it will slip freely when it needs to. Another good reason to stay close to or below 1,600 degrees. Put 3 feet of pipe in a vice. Place a dial indicator on the end of the pipe. Heat one side of the pipe and watch. Like a hot exhaust pipe with air blowing on one side. Inspect pipes before every flight. I was cracking headers apart at the collector. (welded tight). I put a blast tube in to cool the collector. The pipe cracked apart through the EGT probe hole. I made a slip joint connection, and even with a Dutch clamp keeping the connection fairly snug, no cracks in 30 years. Support the down stream stuff, so that the headers are not seeing any of that weight. Lynn E. Hanover --part1_465d1.167f130a.3a82fbaf_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 2/8/2011 1:15:46 P.M. Eastern Standard Time,=20 jskmberki@windstream.net writes:

I placed=20 2 slip joints in each of the header runners. Can the slip=20 joint
movement be maintained? Can anything be applied to the sl= ip=20 joint to ensure
that it does not bind up?
Thanks for any help
<= BR>Joe=20 Berki
Limo EZ

The forces generated when a nest of snakes header system is welded up= =20 tight, like a street header for a V-8 where 4 headers are welded into a=20 collector are immense. And so usually crack in a few years, and at very lo= w=20 temperatures. In racing that 4 into one header has pipes that slip in= to the=20 collector and even though they fit snugly are not able to generate enough= force=20 to crack themselves.

I have Inconel headers from Indy cars built just like that. This allo= ws the=20 header pipes to be made so thin that they are discarded after 3 heat cycle= s.=20 Probably not a good practice for airplanes.

If the slip joint is not so tight that it needs extensive hammering= to get=20 it together it will slip freely when it needs to. Another good reason to= stay=20 close to or below 1,600 degrees.

Put 3 feet of pipe in a vice. Place a dial indicator on the end of th= e=20 pipe. Heat one side of the pipe and watch.

Like a hot exhaust pipe with air blowing on one side.

Inspect pipes before every flight.

I was cracking headers apart at the collector. (welded tight). I put= a=20 blast tube in to cool the collector.

The pipe cracked apart through the EGT probe hole.

I made a slip joint connection, and even with a Dutch clamp keeping= the=20 connection fairly snug, no cracks in 30 years.

Support the down stream stuff, so that the headers are not seein= g any=20 of that weight.

Lynn E. Hanover

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