Return-Path: Received: from fed1mtao02.cox.net ([68.6.19.243] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2912305 for flyrotary@lancaironline.net; Wed, 31 Dec 2003 12:37:04 -0500 Received: from BigAl ([68.107.116.221]) by fed1mtao02.cox.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20031231173704.GRIP27510.fed1mtao02.cox.net@BigAl> for ; Wed, 31 Dec 2003 12:37:04 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: exhaust flange? Date: Wed, 31 Dec 2003 09:37:18 -0800 Message-ID: <001a01c3cfc4$bced3df0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001B_01C3CF81.AEC9FDF0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4024 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_001B_01C3CF81.AEC9FDF0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Russell Duffy Sent: Wednesday, December 31, 2003 8:33 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: exhaust flange? > It works well so long as none of the tube touches the sides of the hole > through the flange. In the case of thick walled tubing, it doesn't matter. Hum-m-m; that's interesting. My opinion is that a tight fit into the flange is just fine. The key is that any side loading is taken by the bearing against the flange, and not by the weld, and would likely also reduce the thermal stresses in the immediate region of the weld. Maybe a question of whether you are using inconel, or SS which is subject to stress corrosion in the tube walls. I was surprised (and disappointed) when I got my tangential manifold muffler done by a FAA certified welder to find that it is welded on the outside. It is .058 inconel into the RB flange. Same guy did Dave Atkins, so his is probably the same way and apparently still is fine. It's definitely a source of concern to me. Al ------=_NextPart_000_001B_01C3CF81.AEC9FDF0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

 

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On = Behalf Of Russell Duffy
Sent: Wednesday, December 31, 2003 8:33 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: exhaust flange?

 

> It works well so long as none of the tube touches the sides of the hole =

> through the flange. In the case of thick walled tubing, it doesn't = matter.

 

Hum-m-m; that’s interesting.  My opinion = is that a tight fit into the flange is just fine.  The key is that any = side loading is taken by the bearing against the flange, and not by the weld, = and would likely also reduce the thermal stresses in the immediate region of = the weld. Maybe a question of whether you are using inconel, or SS which is = subject to stress corrosion in the tube walls.

 

I was surprised (and disappointed) when I got my = tangential manifold muffler done by a FAA certified welder to find that it is = welded on the outside.  It is = .058 inconel into the RB flange.  Same guy did Dave Atkins, so his is probably = the same way and apparently still is fine.  It’s definitely a source = of concern to me. 

 

Al

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