X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 07 Jan 2008 15:51:16 -0500 Message-ID: X-Original-Return-Path: Received: from smtp1.av-mx.com ([137.118.16.57] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2634858 for lml@lancaironline.net; Mon, 07 Jan 2008 14:09:40 -0500 Received-SPF: pass receiver=logan.com; client-ip=137.118.16.57; envelope-from=pinetownd@volcano.net Received: from DennisDell (208-3-194-198.volcano.net [208.3.194.198]) (Authenticated sender: pinetownd@volcano.net) by smtp1.av-mx.com (Postfix) with ESMTP id 327C1290292 for ; Mon, 7 Jan 2008 14:09:00 -0500 (EST) X-Original-Message-ID: <013901c85160$be637b00$6601a8c0@DennisDell> From: "Dennis Johnson" X-Original-To: "Lancair Mailing List" Subject: Legacy Wing Bolt Torque Specs X-Original-Date: Mon, 7 Jan 2008 11:08:51 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0136_01C8511D.AF5DCA40" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0136_01C8511D.AF5DCA40 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable >Does anyone know the torque specs for the two wing spar bolts on the = Legacy? =20 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. =20 Best, Dennis Johnson Legacy, 110 hours ------=_NextPart_000_0136_01C8511D.AF5DCA40 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable

>Does anyone know the torque specs for the two wing spar bolts = on the=20 Legacy?

I asked my aero engineer friend the same question when I was = building my=20 Legacy. He said that one purpose of torquing a fastener is to make = sure=20 that the torque exceeds the tension load experienced by the fastener = while it's=20 in use. I think what he meant is that you want the tension on the = bolt to=20 be high enough that it's not possible for any "play" to develop from = further=20 stretching the bolt when the bolt is in use.

The Legacy's wing bolts are mainly stressed in shear and are=20 under light tension load, so the "correct" torque is probably not=20 critical. I looked up the standard torque of that size bolt, which = was way=20 more than I could achieve in such a cramped space.

Best,

Dennis Johnson

Legacy, 110 hours

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