Return-Path: Sender: (Marvin Kaye) To: lml Date: Mon, 09 Dec 2002 01:15:27 -0500 Message-ID: X-Original-Return-Path: Received: from smtp.comcast.net ([24.153.64.2] verified) by logan.com (CommuniGate Pro SMTP 4.0.2) with ESMTP id 1897679 for lml@lancaironline.net; Sun, 08 Dec 2002 23:51:07 -0500 Received: from cp172883-b.arlngt01.va.comcast.net (pcp735631pcs.arlngt01.va.comcast.net [68.50.58.204]) by mtaout06.icomcast.net (iPlanet Messaging Server 5.2 HotFix 1.05 (built Nov 6 2002)) with ESMTP id <0H6U00IUZ5CNVT@mtaout06.icomcast.net> for lml@lancaironline.net; Sun, 08 Dec 2002 23:51:06 -0500 (EST) X-Original-Date: Sun, 08 Dec 2002 23:53:26 -0500 From: Bob Pastusek Subject: RE: [LML] Stopnuts - AN365 vs MS21042 In-reply-to: X-Original-To: Lancair Mailing List Reply-to: rpastusek@htii.com X-Original-Message-id: <00b301c29f3e$e9299380$6601a8c0@cp172883-b.arlngt01.va.comcast.net> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V4.72.2106.4 X-Mailer: Microsoft Outlook 8.5, Build 4.71.2173.0 Content-type: multipart/alternative; boundary="Boundary_(ID_JpaV6cXsfNWGUXmFfNO5MQ)" Importance: Normal X-Priority: 3 (Normal) X-MSMail-priority: Normal This is a multi-part message in MIME format. --Boundary_(ID_JpaV6cXsfNWGUXmFfNO5MQ) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Clark, The all-metal nuts we used on AF jet engines exceeded the tensile strength of AN components for equivalent size fasteners, but I don't have the data for these specific parts. One consideration is that the MS nuts don't have as much bearing surface, so I'd suggest using only the standard (vice the thin) washers with them when applying to composite and other "soft" materials, and carefully watch the tightening torque. From personal experience, the thin washers, combined with overtightening that is typical without aid of a torque wrench, will "cone" the washers and supporting material--especially composites. Although I don't see how you could spare it, most of the rest of us could achieve even better weight savings, and improve our general lot in life in by a modest diet... Bob -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net]On Behalf Of Wclarkstill@aol.com Sent: Sunday, December 08, 2002 5:12 PM To: Lancair Mailing List Subject: [LML] Stopnuts - AN365 vs MS21042 Anyone have any guidance on what applications of standard AN365 stopnuts one should NOT replace with the lighter MS21042 all metal stopnuts (~40% the weight of an equivalent AN365)? Any comments Brent R.? With the fuselage still open, one could replace almost every nut in the plane in a day and save 2-3 pounds. But maybe there are some nuts (e.g. large structural ones in the gearbox) I should leave as AN365. Any suggestions? Thanks, Clark Still (New York, 100% TB20, 44% LIVPT) --Boundary_(ID_JpaV6cXsfNWGUXmFfNO5MQ) Content-type: text/html; charset=iso-8859-1 Content-transfer-encoding: 7BIT
Clark,

The all-metal nuts we used on AF jet engines exceeded the tensile strength of AN components for equivalent size fasteners, but I don't have the data for these specific parts. One consideration is that the MS nuts don't have as much bearing surface, so I'd suggest using only the standard (vice the thin) washers with them when applying to composite and other "soft" materials, and carefully watch the tightening torque. From personal experience, the thin washers, combined with overtightening that is typical without aid of a torque wrench, will "cone" the washers and supporting material--especially composites.
 
Although I don't see  how you could spare it, most of the rest of us could achieve even better weight savings, and improve our general lot in life in by a modest diet...
 
Bob
-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net]On Behalf Of Wclarkstill@aol.com
Sent: Sunday, December 08, 2002 5:12 PM
To: Lancair Mailing List
Subject: [LML] Stopnuts - AN365 vs MS21042

Anyone have any guidance on what applications of standard AN365 stopnuts one should NOT replace with the lighter MS21042 all metal stopnuts (~40% the weight of an equivalent AN365)?  Any comments Brent R.?

With the fuselage still open, one could replace almost every nut in the plane in a day and save 2-3 pounds.  But maybe there are some nuts (e.g. large structural ones in the gearbox) I should leave as AN365.

Any suggestions?  Thanks, Clark Still (New York, 100% TB20, 44% LIVPT)
--Boundary_(ID_JpaV6cXsfNWGUXmFfNO5MQ)--