Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Tue, 13 May 2003 09:18:59 -0400 Message-ID: X-Original-Return-Path: Received: from BAY0-SMTP07.adinternal.hotmail.com ([65.54.241.114] verified) by logan.com (CommuniGate Pro SMTP 4.1b6) with ESMTP id 2345677 for flyrotary@lancaironline.net; Mon, 12 May 2003 23:32:01 -0400 X-Originating-IP: [68.7.218.110] X-Originating-Email: [alventures@msn.com] Received: from BigAl ([68.7.218.110]) by BAY0-SMTP07.adinternal.hotmail.com with Microsoft SMTPSVC(5.0.2195.5600); Mon, 12 May 2003 20:31:57 -0700 Reply-To: From: "Al Gietzen" X-Original-To: "'Rotary motors in aircraft'" Subject: : 321 SS thickness X-Original-Date: Mon, 12 May 2003 20:31:55 -0700 Organization: ALVentures X-Original-Message-ID: <000001c31900$36c06a20$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4024 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Original-Return-Path: alventures@email.msn.com X-OriginalArrivalTime: 13 May 2003 03:31:57.0345 (UTC) FILETIME=[34D31910:01C31900] I think we all know by now the SS (including 321) is subject to stress corrosion at the temperatures it sees in rotary near the engine. First choice - use inconel. Second choice - make sure the SS is not subjected to stress; i.e; use slips joints, flex bellows, whatever. My $0.02 worth. Al Gietzen