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X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wproxy.gmail.com ([64.233.184.203] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 929429 for flyrotary@lancaironline.net; Tue, 17 Jan 2006 00:53:36 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.233.184.203; envelope-from=russell.duffy@gmail.com Received: by wproxy.gmail.com with SMTP id 69so1190094wra for ; Mon, 16 Jan 2006 21:52:51 -0800 (PST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:from:to:subject:date:message-id:mime-version:content-type:x-priority:x-msmail-priority:x-mailer:in-reply-to:x-mimeole:importance; b=G9+YHm4aBw32MxxG/enH4H3apOJ7LxLNnb4d2lGzRoMxd8SDzqDbi9S2xF3G4Ib5svvftYexW485dYxlTvbT2LGZ4XjGpL5nXzrZEyH7Vc91krXczM59dQnhFAiw9Rs4sJoLaX/fE1Hf3gYaR+sfsMALpitB6cNzteGLuutNoS4= Received: by 10.54.77.19 with SMTP id z19mr9125773wra; Mon, 16 Jan 2006 21:52:51 -0800 (PST) Return-Path: Received: from rd ( [65.6.194.9]) by mx.gmail.com with ESMTP id 66sm6408046wra.2006.01.16.21.52.47; Mon, 16 Jan 2006 21:52:47 -0800 (PST) From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: shake, rattle and hum Date: Mon, 16 Jan 2006 23:52:47 -0600 Message-ID: <018401c61b2a$3eb4a3c0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0185_01C61AF7.F41A33C0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0185_01C61AF7.F41A33C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I am by no means an expert in vibration analyses, but I have been witness to some unusual vibration events involving steam turbines. In one event a piece of dismantled turbine (60,000 Lb) was set on the independent foundation of an operating steam unit. The shaft vibration on several of the bearings went down. Everyone watching this thought "Hay this ant bad" so when they decided to temporarily store another piece of the dismantled turbine weighing in at 45,000 Lb on the same foundation, no one gave it a second thought until the vibration on the in service turbine jumped up to almost twice what it was previously running. So I guess what I was trying to say was that stationary weight can have as much effect on the vibration as can the rotating weight Hi Bob, Expect the unexpected :-) One of the reasons I'm trying not to get too involved with this problem, is that I KNOW how much time I'll eventually spend on it. It will be an interesting project, and worth the time, but I just can't let myself get caught up in it now. Once the RV-8 is flying, I can go into mad scientist mode to see if there's some solution to this. I've already thought of way too many experiments already. Must resist.... Rusty (RV-8 first, RV-8 first, RV-8 first...) ------=_NextPart_000_0185_01C61AF7.F41A33C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

I am by no=20 means an expert in vibration analyses, but I have been witness to some = unusual=20 vibration events involving steam turbines. In one event = a piece=20 of dismantled turbine (60,000 Lb) was set on the independent=20 foundation of an operating steam unit. The shaft vibration on = several of=20 the bearings went down. Everyone watching this thought "Hay this = ant=20 bad" so when they decided to temporarily store another piece of = the=20 dismantled turbine weighing in at 45,000 Lb on the same = foundation, no one=20 gave it a second thought until the vibration on the in service turbine = jumped up=20 to almost twice what it was previously running. So I guess what I = was=20 trying to say was that stationary weight can have as much effect = on the=20 vibration as can the rotating weight

Hi=20 Bob,

Expect the=20 unexpected :-) One of the reasons I'm trying not to get too = involved=20 with this problem, is that I KNOW how much time I'll eventually = spend on=20 it. It will be an interesting project, and worth the time, = but I just=20 can't let myself get caught up in it now. Once the RV-8 = is=20 flying, I can go into mad scientist mode to see if there's some = solution to=20 this. I've already thought of way too many experiments = already. =20 Must resist....

Rusty (RV-8=20 first, RV-8 first, RV-8 first...)

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