Return-Path: Received: from [129.116.87.171] (HELO MAIL01.austin.utexas.edu) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 620893 for flyrotary@lancaironline.net; Tue, 25 Jan 2005 08:54:53 -0500 Received-SPF: none receiver=logan.com; client-ip=129.116.87.171; envelope-from=mark.steitle@austin.utexas.edu X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C502E5.5F2D0CB5" Subject: RE: [FlyRotary] Re: Performance coatings- bearing damage? Date: Tue, 25 Jan 2005 07:54:21 -0600 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69EC07E7A@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Performance coatings- bearing damage? Thread-Index: AcUCc2fmilscIR8URNuqhRPycV5dhwAca7ug From: "Mark R Steitle" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C502E5.5F2D0CB5 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Rusty, =20 Maybe this is an oversimplification, but can't you take an old bearing and put it in the oven @ 350 degrees for a half-hour and see how it reacts? Just set it on the cookie sheet right next to the brownies. =20 =20 Mark S. =20 =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen Sent: Monday, January 24, 2005 6:18 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Performance coatings- bearing damage? =20 Subject: [FlyRotary] Re: Performance coatings- bearing damage? =20 Will the bearing be damaged at 350 degrees? I'm thinking there's a good chance it will. =20 =20 I'd say no. The is no metal in there that is going to be damaged by 350F. 350C would be another matter. =20 Al=20 =20 As I understand it, the whole issue with keeping the oil temp below 210 is to keep from melting the bearings =20 210 is a good limit for the side seals. If the bearings were Babbit metal (lead/tin alloys with some copper and antimony thrown in, invented by Isacc Babbit about 150 years ago), the melting point would be somewhere around 550F. I have no idea what the composition of the rotor bearings are, but I'm guessing something with much more copper and zinc in it (akin to bronze) and the melting point would be considerably higher. =20 But like I said; I'm only guessing. =20 =20 Al ------_=_NextPart_001_01C502E5.5F2D0CB5 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Rusty,

 

Maybe this is an = oversimplification, but can’t you take an old bearing and put it in the oven @ 350 degrees = for a half-hour and see how it reacts?  Just set it on the cookie sheet right next = to the brownies. 

 

Mark S.  =

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Monday, January 24, = 2005 6:18 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: Performance coatings- bearing damage?

 

Subject: [FlyRotary] Re: Performance coatings- bearing = damage?

 

Will the bearing be damaged = at 350 degrees?  I'm thinking there's a good chance it will.  =

 

I’d say no.  The is no metal in there that is going to be damaged by = 350F.  350C would be another matter.

 

Al 

=

 

As I understand = it, the whole issue with keeping the oil temp below 210 is to keep from melting = the bearings

 

210 is a good limit for the side = seals.  If the bearings were Babbit metal (lead/tin alloys with some = copper and antimony thrown in, invented by Isacc Babbit about 150 years ago), the = melting point would be somewhere around 550F.  I have no idea what the = composition of the rotor bearings are, but I’m guessing something with much = more copper and zinc in it (akin to bronze) and the melting point would be considerably higher.

 

But like I said; I’m only guessing. 

 

Al

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