X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [65.54.250.73] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 972127 for flyrotary@lancaironline.net; Mon, 06 Feb 2006 10:59:19 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.250.73; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 6 Feb 2006 07:58:25 -0800 Message-ID: Received: from 4.174.2.224 by BAY115-DAV1.phx.gbl with DAV; Mon, 06 Feb 2006 15:58:25 +0000 X-Originating-IP: [4.174.2.224] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Tension bolt protection sheet Date: Mon, 6 Feb 2006 10:58:22 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000B_01C62B0C.3F05E270" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 Seal-Send-Time: Mon, 6 Feb 2006 10:58:22 -0500 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 X-OriginalArrivalTime: 06 Feb 2006 15:58:25.0766 (UTC) FILETIME=[29E3C860:01C62B36] This is a multi-part message in MIME format. ------=_NextPart_000_000B_01C62B0C.3F05E270 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Just another point of view. If the tension bolts are installed with the recommended procedure of = putting a spiral bead of RTV on them to prevent vibration fatigue, the = bolt is not likely to break in the first place. If somehow it does = anyway, they always (AFAIK) break at the threaded end. The RTV will = prevent the bolt from backing out. Tracy (paranoid about adding hardware/weight to my plane) Al, I understand your problem with the loose bolts. The thing I need to = mention is why would anyone have a main engine external bolt or nut that = isn't safety wired? I plan to wire all my nuts as this will prevent = anything from falling out if a stud does break. Bill Jepson Hi Bill, I used a technique the rotary racing crowd uses to prevent a = stud/bolt from backing out of the engine into the flywheel/flex plate. = A thin sheet of steel (aluminum might do) the area of which covers all = the tension bolts is used to cover the engine tension bolt heads. This = sheet is attached using the using the rear main bearing/gear support = bolts. This sheet prevents any bolt from backing out should it break. = I put a spot of silicone on head of each bolt to dampen any vibration of = the sheet. I recall at least one incident where a tension bolt did back out, = but fortunately the individual (Perry Mic, I believe) was using the 35 = lb manual flywheel which simply bent the bolt out of the way. A flex = plate may not survive such an encounter. Ed=20 Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com ------=_NextPart_000_000B_01C62B0C.3F05E270 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Just another point of view.
If the tension bolts are installed with the recommended procedure = of=20 putting a spiral bead of RTV on them to prevent vibration fatigue, the = bolt is=20 not likely to break in the first place. If somehow it does anyway, they = always=20 (AFAIK) break at the threaded end.  The RTV will prevent the bolt = from=20 backing out.
 
Tracy (paranoid about adding hardware/weight to my plane)

 
Al,
I understand your problem with the loose bolts. The thing I = need to=20 mention is why would anyone have a main engine external bolt or nut = that=20 isn't safety wired?  I plan to wire all my nuts as this = will=20 prevent anything from falling out if a stud does break.
Bill Jepson
 
Hi Bill,
 
I used a technique the rotary racing crowd uses = to prevent=20 a stud/bolt from backing out of the engine into the flywheel/flex=20 plate.   A thin sheet of steel (aluminum might do) the = area of=20 which covers all the tension bolts is used to cover  the engine = tension=20 bolt heads.  This sheet is attached using the  using the=20 rear main bearing/gear support bolts.  This sheet prevents = any=20 bolt from backing out should it break.  I put a spot of = silicone on=20 head of each bolt to dampen any vibration of the sheet.
 
I recall at least one incident  where a = tension bolt=20 did back out, but fortunately the individual (Perry Mic, I believe) = was=20 using the 35 lb manual flywheel which simply bent the bolt out of = the=20 way.  A flex plate may not survive such an = encounter.
 
Ed
 
Ed Anderson
Rv-6A N494BW Rotary = Powered
Matthews,=20 NC
eanderson@carolina.rr.com
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