Return-Path: Received: from [206.228.212.23] (HELO mail.statesville.net) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 534718 for flyrotary@lancaironline.net; Tue, 16 Nov 2004 12:25:47 -0500 Received-SPF: none receiver=logan.com; client-ip=206.228.212.23; envelope-from=twjames@statesville.net Received: from TWJames [63.162.171.178] by mail.statesville.net with ESMTP (SMTPD32-8.13) id A877C174005E; Tue, 16 Nov 2004 12:27:19 -0500 From: "Tommy James" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Post Mortem on Steve Brooks RD-1B Date: Tue, 16 Nov 2004 12:25:30 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0101_01C4CBD7.5D056BA0" X-Mailer: Microsoft Office Outlook, Build 11.0.6353 Thread-Index: AcTL972C5t7ix8CSQrKK8dXOpY2s1gACUtbA In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Message-Id: <200411161227904.SM02356@TWJames> X-RBL-Warning: REVDNS: This E-mail was sent from a MUA/MTA 63.162.171.178 with no reverse DNS entry. X-RBL-Warning: SPAMHEADERS: This E-mail has headers consistent with spam [4000020e]. X-Declude-Sender: twjames@statesville.net [63.162.171.178] X-Note: Scanned for Spam This is a multi-part message in MIME format. ------=_NextPart_000_0101_01C4CBD7.5D056BA0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Thanks T, An honest man may be hard to find, but appreciated by all who know him. Tommy<>< _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook Sent: Tuesday, November 16, 2004 11:11 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Post Mortem on Steve Brooks RD-1B Total time on drive was 20 hours. Steve noticed the problem as an oil leak from the input shaft oil seal. Internal inspection showed the input shaft thrust bearing roller cage which is a polymer cage to be partially melted and most of the rollers were out of the cage. Overheat was the obvious cause of cage failure. Rear race of bearing was seized on input shaft and was 'blued' from heat. This allowed the shaft to move back and contact the adapter plate. All sorts of nastiness resulted from this but the details are not as important as the root cause. Amazingly, the drive continued to operate normally but the time between roller cage failure and discovery of the problem is unknown. The oil passage from the input shaft pilot bearing to the thrust bearing was found to be clogged and no oil was getting to the thrust bearing (except for incidental splash). What caused the clog has not been determined. I will attempt to carefully grind away the input gear and see what it was as time permits. The rear race was spinning against the adapter plate and acting as the thrust bearing while being lubricated only with splash. That Mobile 1 is amazing stuff! A careful inspection of the gears showed no evidence of damage or wear. Corrective action: Replaced the input shaft assembly and thrust bearing, installed nylon snubber/spacer to bring input shaft endplay into spec. Tracy Crook, RWS ------=_NextPart_000_0101_01C4CBD7.5D056BA0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Thanks T,

An honest man may be hard to find, = but appreciated by all who know him.

Tommy<><

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook
Sent: Tuesday, November = 16, 2004 11:11 AM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = Post Mortem on Steve Brooks RD-1B

Total time on = drive was 20 hours. Steve noticed the problem as an oil leak from the input shaft oil seal. Internal inspection showed the = input shaft thrust bearing roller cage which is a polymer cage to be partially = melted and most of the rollers were out of the cage. Overheat was the = obvious cause of cage failure. Rear race of bearing was seized on input = shaft and was 'blued' from heat. This allowed the shaft to move back and contact = the adapter plate. All sorts of nastiness resulted from this but the = details are not as important as the root cause. Amazingly, the drive = continued to operate normally but the time between roller cage failure and discovery = of the problem is unknown.

<= /font>

<= /font>

The oil = passage from the input shaft pilot bearing to the thrust bearing was found to be = clogged and no oil was getting to the thrust bearing (except for incidental = splash). What caused the clog has not been determined. I will attempt to = carefully grind away the input gear and see what it was as time = permits.

<= /font>

=

The rear race = was spinning against the adapter plate and acting as the thrust bearing = while being lubricated only with splash. That Mobile 1 is amazing = stuff!

<= /font>

A careful = inspection of the gears showed no evidence of damage or wear.

<= /font>

Corrective action: Replaced the input shaft assembly and thrust bearing, installed nylon snubber/spacer to bring input shaft endplay into = spec.

<= /font>

Tracy Crook, RWS

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