Return-Path: Received: from [206.46.252.40] (HELO vms040pub.verizon.net) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 880700 for flyrotary@lancaironline.net; Sun, 17 Apr 2005 04:38:29 -0400 Received: from [63.24.48.27] ([63.24.50.3]) by vms040.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0IF300HGE1BXKY79@vms040.mailsrvcs.net> for flyrotary@lancaironline.net; Sun, 17 Apr 2005 03:38:29 -0500 (CDT) Date: Sun, 17 Apr 2005 01:44:55 -0700 From: Ken Welter Subject: Re: [FlyRotary] End Clearancing of Rotors was Re: [FlyRotary] Re: New rotors, New housings In-reply-to: X-Sender: res0c5l1@incoming.verizon.net To: "Rotary motors in aircraft" Message-id: MIME-version: 1.0 Content-type: multipart/alternative; boundary="============_-1098394987==_ma============" References: --============_-1098394987==_ma============ Content-Type: text/plain; charset="us-ascii" ; format="flowed" It could also give you a few extra valuable seconds of power in the case of an oil loss. Ken > > >There is an additional advantage. If you happen to lose oil >pressure, (even with a 2 piece centre bearing crank), the rotor >has a natural tendency to cock on the stationary gear due to lack of >the oil film on the crank journals. If you have clearanced the >rotor tips, then there is less likelihood that the corner & side >seals will be swaged into their grooves. In reality, loss of oil >pressure is usually catastrophic anyway, and the rotor usually >needs to be replaced as the raised lands (the rotor gear and the >land on the opposite side sit proud of the actual rotor faces) >usually cop a hiding and end up cleaning up below spec. > > >My couple of Brass Razoos for today, > >Cheers, > >Leon > --============_-1098394987==_ma============ Content-Type: text/html; charset="us-ascii" Re: [FlyRotary] End Clearancing of Rotors was Re: [FlyRota
   It could also give you a few extra valuable seconds of power in the case of an oil loss.
  Ken



 

There is an additional advantage.  If you happen to lose oil pressure,  (even with a 2 piece centre bearing crank),  the rotor has a natural tendency to cock on the stationary gear due to lack of the oil film on the crank journals.  If you have clearanced the rotor tips,  then there is less likelihood that the corner & side seals will be swaged into their grooves.  In reality,  loss of oil pressure is usually catastrophic anyway,  and the rotor usually needs to be replaced as the raised lands (the rotor gear and the land on the opposite side sit proud of the actual rotor faces) usually cop a hiding and end up cleaning up below spec.
 
 
My couple of Brass Razoos for today,
 
Cheers,
 
Leon
 

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