X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao06.cox.net ([68.230.241.33] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1027266 for flyrotary@lancaironline.net; Thu, 30 Jun 2005 12:42:30 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.33; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao06.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050630164144.UHPI19494.fed1rmmtao06.cox.net@BigAl> for ; Thu, 30 Jun 2005 12:41:44 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Stainless Steel 13B Exhaust Flange? Date: Thu, 30 Jun 2005 09:41:47 -0700 Message-ID: <000d01c57d92$9b3fe400$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01C57D57.EEE10C00" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_000E_01C57D57.EEE10C00 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Re: Stainless Steel 13B Exhaust Flange? =20 How about 1/8" SS and then weld on the cut-off tiangles as stiffeners = from bolt holes to exhaust hole? If I'm not mistaken, Tracy said he made some flanges out of 1/8" steel (don't recall if it was stainless), and I guess they worked. Seems like = he felt that was pretty minimal though. I don't think I'd hesitate to use 3/16". Personally, I'd probably rather use stiffer material, than go to = the trouble of welding the stiffeners on. =20 =20 Rusty; =20 It's not the stiffness of the flange we're after; it's strengthening of = the pipe to flange joint. It's an area of lots of thermal stresses; and the flange to pipe weld is likely the most common failure point, especially = if there is not flexibility for stress relief downstream on the pipes. Of course the geometry and the welding of the stiffeners is a bit critical = as well. =20 Al ------=_NextPart_000_000E_01C57D57.EEE10C00 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Subject: [FlyRotary] Re: Stainless Steel 13B Exhaust Flange?

 

How about = 1/8" SS and then weld on the cut-off tiangles as stiffeners from bolt holes to = exhaust hole?

If I'm not mistaken, Tracy said he = made some flanges out of 1/8" steel (don't recall if it was stainless), = and I guess they worked.  Seems like he felt that was pretty minimal though.  I don't think I'd hesitate to use 3/16".  Personally, I'd probably rather use stiffer material, than go to = the trouble of welding the stiffeners on.  

 

Rusty;

 

It’s not the stiffness of = the flange we’re after; it’s strengthening of the pipe to flange = joint.  It’s an area of lots of thermal stresses; and the flange to = pipe weld is likely the most common failure point, especially if there is not flexibility for stress relief downstream on the pipes.  Of course = the geometry and the welding of the stiffeners is a bit critical as = well.

 

Al

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