X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 08 Jan 2008 15:23:25 -0500 Message-ID: X-Original-Return-Path: Received: from fmailhost03.isp.att.net ([204.127.217.103] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2635348 for lml@lancaironline.net; Mon, 07 Jan 2008 20:25:57 -0500 Received-SPF: pass receiver=logan.com; client-ip=204.127.217.103; envelope-from=bbradburry@bellsouth.net Received: from arptk8ng400 (adsl-154-183-252.mco.bellsouth.net[72.154.183.252]) by isp.att.net (frfwmhc03) with SMTP id <20080108012517H0300id6l7e>; Tue, 8 Jan 2008 01:25:17 +0000 X-Originating-IP: [72.154.183.252] From: "Bill Bradburry" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] Legacy Wing Bolt Torque Specs X-Original-Date: Mon, 7 Jan 2008 20:26:04 -0500 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003F_01C8516B.8707E050" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AchRbxVDxoI9DtzbQOOtCXPm4xeNXgAJfp6A X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16545 This is a multi-part message in MIME format. ------=_NextPart_000_003F_01C8516B.8707E050 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit So is the general consensus that the torque spec is, "Tight as you can get it!"? Bill B _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Dennis Johnson Sent: Monday, January 07, 2008 3:51 PM To: lml@lancaironline.net Subject: [LML] Legacy Wing Bolt Torque Specs >Does anyone know the torque specs for the two wing spar bolts on the Legacy? I asked my aero engineer friend the same question when I was building my Legacy. He said that one purpose of torquing a fastener is to make sure that the torque exceeds the tension load experienced by the fastener while it's in use. I think what he meant is that you want the tension on the bolt to be high enough that it's not possible for any "play" to develop from further stretching the bolt when the bolt is in use. The Legacy's wing bolts are mainly stressed in shear and are under light tension load, so the "correct" torque is probably not critical. I looked up the standard torque of that size bolt, which was way more than I could achieve in such a cramped space. Best, Dennis Johnson Legacy, 110 hours ------=_NextPart_000_003F_01C8516B.8707E050 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

So is the general consensus that the torque spec is, = “Tight as you can get it!”?

Bill B

From: Lancair Mailing List = [mailto:lml@lancaironline.net] On Behalf Of Dennis Johnson
Sent: Monday, January 07, = 2008 3:51 PM
To: = lml@lancaironline.net
Subject: [LML] Legacy = Wing Bolt Torque Specs

>Does anyone know the torque specs for the two wing spar = bolts on the Legacy?

I asked my aero engineer friend the same question when I was = building my Legacy. He said that one purpose of torquing a fastener is to = make sure that the torque exceeds the tension load experienced by the = fastener while it's in use. I think what he meant is that you want the tension on = the bolt to be high enough that it's not possible for any "play" = to develop from further stretching the bolt when the bolt is in = use.

The Legacy's wing bolts are mainly stressed in shear and are under light tension load, so the "correct" torque is = probably not critical. I looked up the standard torque of that size bolt, = which was way more than I could achieve in such a cramped space. =

Best,

Dennis Johnson

Legacy, 110 hours =

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