X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d23.mx.aol.com ([205.188.139.137] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 1004311 for flyrotary@lancaironline.net; Thu, 16 Jun 2005 15:14:36 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.139.137; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-d23.mx.aol.com (mail_out_v38_r1.7.) id q.149.471b54cb (16110) for ; Thu, 16 Jun 2005 15:13:49 -0400 (EDT) Received: from mblk-d45 (mblk-d45.mblk.aol.com [205.188.212.229]) by air-id12.mx.aol.com (v106.2) with ESMTP id MAILINID122-3eee42b1cf6c203; Thu, 16 Jun 2005 15:13:49 -0400 Date: Thu, 16 Jun 2005 15:13:48 -0400 Message-Id: <8C740BEA8BC49BD-B14-84CD@mblk-d45.sysops.aol.com> From: wrjjrs@aol.com References: Received: from 66.127.99.234 by mblk-d45.sysops.aol.com (205.188.212.229) with HTTP (WebMailUI); Thu, 16 Jun 2005 15:13:48 -0400 X-MB-Message-Source: WebUI X-MB-Message-Type: User In-Reply-To: X-Mailer: AOL WebMail 1.1.0.12781 Subject: Re: [FlyRotary] Re: turbo oil drain Content-Type: multipart/alternative; boundary="--------MailBlocks_8C740BEA8B7850D_B14_80B4_mblk-d45.sysops.aol.com" MIME-Version: 1.0 To: flyrotary@lancaironline.net X-AOL-IP: 205.188.212.229 ----------MailBlocks_8C740BEA8B7850D_B14_80B4_mblk-d45.sysops.aol.com Content-Type: text/plain; charset="us-ascii" -----Original Message----- From: Russell Duffy <13brv3@bellsouth.net> To: Rotary motors in aircraft Sent: Thu, 16 Jun 2005 13:34:16 -0500 Subject: [FlyRotary] Re: turbo oil drain You need pressurized oil on the turbo bearings. The shaft will sieze VERY fast if there isn't oil pressure. Now wait a minute. Didn't we just establish that the bearing "seals" will not hold even the slightest pressure, which means we can NOT pressurize them. Sounds like we need oil flow, not pressure. Rusty Partially true Rusty. But what is done is that there is a clearance space at the end of the bearings. After the oil bleeds out of the bearing there is no real pressure. You didn't think the e-shaft end seals hold back 100+ PSI oil pressure did you? Bill Jepson ----------MailBlocks_8C740BEA8B7850D_B14_80B4_mblk-d45.sysops.aol.com Content-Type: text/html; charset="us-ascii"

-----Original Message-----
From: Russell Duffy <13brv3@bellsouth.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, 16 Jun 2005 13:34:16 -0500
Subject: [FlyRotary] Re: turbo oil drain

You need pressurized oil on the turbo bearings. The shaft will sieze VERY fast if there isn't oil pressure.

Now wait a minute. Didn't we just establish that the bearing "seals" will not hold even the slightest pressure, which means we can NOT pressurize them. Sounds like we need oil flow, not pressure.

Rusty

Partially true Rusty. But what is done is that there is a clearance space at the end of the bearings. After the oil bleeds out of the bearing there is no real pressure. You didn't think the e-shaft end seals hold back 100+ PSI oil pressure did you?

Bill Jepson

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