Return-Path: Received: from wb1-a.mail.utexas.edu ([128.83.126.134] verified) by logan.com (CommuniGate Pro SMTP 4.2.1) with ESMTP-TLS id 400461 for flyrotary@lancaironline.net; Tue, 07 Sep 2004 10:47:17 -0400 Received-SPF: none receiver=logan.com; client-ip=128.83.126.134; envelope-from=msteitle@mail.utexas.edu Received: (qmail 14925 invoked from network); 7 Sep 2004 14:46:47 -0000 Received: from dhcp-191-101.per.utexas.edu (HELO hrs-mark.mail.utexas.edu) (146.6.191.101) by wb1.mail.utexas.edu with SMTP; 7 Sep 2004 14:46:47 -0000 Message-Id: <5.1.1.5.2.20040907094159.0103b488@localhost> X-Sender: msteitle@mail.utexas.edu@localhost X-Mailer: QUALCOMM Windows Eudora Version 5.1.1 Date: Tue, 07 Sep 2004 09:46:40 -0500 To: "Rotary motors in aircraft" From: Mark Steitle Subject: Re: [FlyRotary] Temperature limits on Locknuts In-Reply-To: Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_8740937==.ALT" --=====================_8740937==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed Ed, I recently became aware of the practice of using only metal locknuts on everything fwf. So, I ordered a couple dozen of each size and replaced everything fwf on my installation except for the ones used on the psru bolts. Did you change those to metal or use the nylon supplied with the redrive? Mark S. Mark S. At 10:43 PM 9/5/2004 -0400, you wrote: >Attached is what I found with a quick search for locknuts with >plastic/nylon inserts. The max temperature range is listed as 250F. The >metal ones go up to 1000F. So perhaps metal is overkill - but 250F does >not provide me with a comfort margin I would like under the cowl. > >I agree that the prop bolt nuts should never see 250F, but, the question >is what effect elevated temperatures short of 250F do to the life of the >material. > >So it would appear that what ever makes you feel comfortable would be the >way to go. Me, for the prop and most things forward of the firewall, I'll >continue to use the Metal Lock nuts. > >Ed > > >Ed Anderson >RV-6A N494BW Rotary Powered >Matthews, NC > > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html --=====================_8740937==.ALT Content-Type: text/html; charset="us-ascii" Ed,
I recently became aware of the practice of using only metal locknuts on everything fwf. So, I ordered a couple dozen of each size and replaced everything fwf on my installation except for the ones used on the psru bolts. Did you change those to metal or use the nylon supplied with the redrive?

Mark S.

Mark S. At 10:43 PM 9/5/2004 -0400, you wrote:

Attached is what I found with a quick search for locknuts with plastic/nylon inserts. The max temperature range is listed as 250F. The metal ones go up to 1000F. So perhaps metal is overkill - but 250F does not provide me with a comfort margin I would like under the cowl.

I agree that the prop bolt nuts should never see 250F, but, the question is what effect elevated temperatures short of 250F do to the life of the material.

So it would appear that what ever makes you feel comfortable would be the way to go. Me, for the prop and most things forward of the firewall, I'll continue to use the Metal Lock nuts.

Ed

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC

>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html

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