Return-Path: Received: from fed1rmmtao05.cox.net ([68.230.241.34] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 620278 for flyrotary@lancaironline.net; Mon, 24 Jan 2005 19:18:30 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.34; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao05.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with ESMTP id <20050125001759.PFSJ14815.fed1rmmtao05.cox.net@BigAl> for ; Mon, 24 Jan 2005 19:17:59 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Performance coatings- bearing damage? Date: Mon, 24 Jan 2005 16:18:10 -0800 Message-ID: <000001c50273$5a93d6e0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C50230.4C7551D0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C50230.4C7551D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable 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_000_0001_01C50230.4C7551D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

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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