Return-Path: Received: from out003.verizon.net ([206.46.170.103] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 620721 for flyrotary@lancaironline.net; Tue, 25 Jan 2005 02:48:39 -0500 Received-SPF: pass receiver=logan.com; client-ip=206.46.170.103; envelope-from=rotary.coot@verizon.net Received: from [192.168.1.103] ([65.239.57.50]) by out003.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20050125074804.LFZJ1106.out003.verizon.net@[192.168.1.103]> for ; Tue, 25 Jan 2005 01:48:04 -0600 Mime-Version: 1.0 X-Sender: res0c5l1@incoming.verizon.net Message-Id: In-Reply-To: References: Date: Mon, 24 Jan 2005 23:52:47 -0800 To: "Rotary motors in aircraft" From: Ken Welter Subject: [FlyRotary] Re: Performance coatings- bearing damage? Content-Type: multipart/alternative; boundary="============_-1105482865==_ma============" X-Authentication-Info: Submitted using SMTP AUTH at out003.verizon.net from [65.239.57.50] at Tue, 25 Jan 2005 01:48:03 -0600 --============_-1105482865==_ma============ Content-Type: text/plain; charset="us-ascii" ; format="flowed" I use two 2nd gen coolers, its real hard to keep the rotary cool in the coot as full power climb out is only 80 mph and I hold full power for 30 to 40 minutes at a time when lifting off at a gross weight of 3200 lbs. Ken > >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. > > > >Will the bearing be damaged at 350 degrees? I'm thinking there's a >good chance it will. > > > >Thanks, > >Rusty (still undecided) > > --============_-1105482865==_ma============ Content-Type: text/html; charset="us-ascii" [FlyRotary] Re: Performance coatings- bearing damage?
    I use two 2nd gen coolers, its real hard to keep the rotary cool in the coot as full power climb out is only 80 mph and I hold full power for 30 to 40 minutes at a time when lifting off at a gross weight of 3200 lbs.
  Ken



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.  
 
Will the bearing be damaged at 350 degrees?  I'm thinking there's a good chance it will. 
 
Thanks,
Rusty (still undecided)
 

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