Return-Path: Received: from mail20.syd.optusnet.com.au ([211.29.132.201] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP-TLS id 620687 for flyrotary@lancaironline.net; Tue, 25 Jan 2005 02:06:19 -0500 Received-SPF: none receiver=logan.com; client-ip=211.29.132.201; envelope-from=lendich@optusnet.com.au Received: from george (d220-236-245-114.dsl.nsw.optusnet.com.au [220.236.245.114]) by mail20.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j0P75iqi017642 for ; Tue, 25 Jan 2005 18:05:45 +1100 Message-ID: <004201c502ac$8e65bdb0$72f5ecdc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Performance coatings- bearing damage? Date: Tue, 25 Jan 2005 17:07:38 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003F_01C50300.5F9794A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_003F_01C50300.5F9794A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Performance coatings- bearing damage? Ken, Is that lower temp with the 2nd oil cooler? George ( down under) When I first started flying my coot the rotors were not coated and = I was fighting cooling problems and I was seeing oil temps up to 260 = degrees on full power climb and cruising at 220 degrees, I then pulled = the engine down and coated the rotors without pulling the bearings and = had no problems with them. After coating the rotors the temp toped out at 220 on climb and = dropped to 180 in cruise, at that point that was the only change I made = and ran it for several hundred hrs so that should be a good comparison = of apples to apples, since then I have made changes that has dropped the = temp to 160 on climb and 140 in cruise. Ken Welter Greetings, I just talked to Brad at Performance Coatings, and he said they try = to batch items together, to keep from wasting material. For scheduling = purposes, it's interesting to note that they do piston tops, and rotors = on Wednesdays. They charge $45 for each rotor. The process includes = blasting the rotor faces, spraying on the coating, and curing it at 350 = degrees. They have a fixture that they use on rotors, which keeps = anything from touching the bearing. =20 Will the bearing be damaged at 350 degrees? I'm thinking there's a = good chance it will.=20 Thanks, Rusty (still undecided) ------=_NextPart_000_003F_01C50300.5F9794A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Performance coatings- bearing = damage?
 
Ken,
Is that lower temp with the 2nd oil=20 cooler?
George ( down under)
 
   When I first started flying my = coot the=20 rotors were not coated and I was fighting cooling problems and I was = seeing=20 oil temps up to 260 degrees on full power climb and cruising at 220 = degrees, I=20 then pulled the engine down and coated the rotors without pulling the = bearings=20 and had no problems with them.
 After coating the rotors the temp = toped out at=20 220 on climb and dropped to 180 in cruise, at that point that was the = only=20 change I made and ran it for several hundred hrs so that should be a = good=20 comparison of apples to apples, since then I have made changes that = has=20 dropped the temp to 160 on climb and 140 in cruise.
 Ken Welter






Greetings,
 
I just talked = to Brad at=20 Performance Coatings, and he said they try to batch items together, = to keep=20 from wasting material.  For scheduling purposes, it's = interesting to=20 note that they do piston tops, and rotors on = Wednesdays.  =20 They charge $45 for each rotor.  The process includes blasting = the=20 rotor faces, spraying on the coating, and curing it at 350 = degrees. =20 They have a fixture that they use on rotors, which keeps anything = from=20 touching the bearing.  
 
Will the = bearing be damaged=20 at 350 degrees?  I'm thinking there's = a good=20 chance it will. 
 
Thanks,
Rusty (still=20 undecided)
 

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