X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.219.56.248] (HELO qnsi-xch.qnsi.net) by logan.com (CommuniGate Pro SMTP 5.0.5) with ESMTP id 905247 for flyrotary@lancaironline.net; Thu, 29 Dec 2005 11:47:14 -0500 Received-SPF: none receiver=logan.com; client-ip=66.219.56.248; envelope-from=bhughes@qnsi.net Content-class: urn:content-classes:message Return-Receipt-To: "Bobby J. Hughes" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C60C97.83BA2F90" Subject: RE: [FlyRotary] Re: Unobtainium seals? Disposition-Notification-To: "Bobby J. Hughes" X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0 Date: Thu, 29 Dec 2005 10:47:11 -0600 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Unobtainium seals? thread-index: AcYMlzbAFjAfPpkuTaeyqsH0nvhEkwAAD6PQ From: "Bobby J. Hughes" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C60C97.83BA2F90 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Are you planning any for the Renesis :) =20 Bobby ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook Sent: Thursday, December 29, 2005 10:43 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Unobtainium seals? =20 On Dec 28, 2005, at 6:54 PM, wrjjrs@aol.com wrote: =09 Monty, Carbon is old-speak, most are going for Tracys' ceramic seals. The take a while to break in, but seem to last very well. Rotor housing wear hasn't been a problem for anyone not using a 100,000 mile motor to start with. Ed Anderson ran into some trouble with ROTOR tip seal slot wear, check yours carefully. I defer to Tracy, Ed and Lynn as to the corner seals, nobody I know has really worn out a motor. (including racers in sedan classes!) Bill Jepson =20 =09 Bill, Tracy's seals are not ceramic. They are made from a super secret Unobtainium metal:) Buly To everybody on fly rotary, MEA CULPA. Incorrect listing for the ceramic seals! Tracy's seals are listed as a "Proprietary alloy" that is not a derivative of gray cast iron as most are. (Mazda's as well) I was thinking of ceramic seals. Then Tracy's seals and blurted that out.=20 Lynn, My dad was a ceramic expert. The softest true ceramic is so hard that it can only be machined using diamond grinding processes, hence the "stupid" prices. (I agree that the actual ceramic seals are hideously expensive) Monty, I do still say that carbon seals are not a good Idea for an aircraft engine. Go with something more durable like Tracy's or the high priced ceramic. Fortunately for us Tracy's seals are getting good reports from the car guys using them at ridiculous RPM and pressure. They should last well in our engines. Tracy's seals are much cheaper as well so let's get some! Buly, I am planning to start an UNOBTAININUM mine real soon, wanna buy stock? Bill Jepson=20 =20 True, the seals are made of unobtainium : ) But it gets worse. Will soon introduce nitrided unobtainium seals. This is in response to the drag racing maniacs running 30+ pounds of boost with occasional detonation. The seals still don't break but they can be bent downward in the middle when at high temperature and detonation slams them down, bottoming them out on the spring seats. The nitrided seals retain their strength at higher temps. =20 =20 Tracy=20 ------_=_NextPart_001_01C60C97.83BA2F90 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Are you = planning any for=20 the Renesis :)

Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy=20 Crook
Sent: Thursday, December 29, 2005 10:43 AM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Unobtainium=20 seals?

On Dec 28, 2005, at 6:54 PM, wrjjrs@aol.com wrote:

Monty,

Carbon is = old-speak, most=20 are going for Tracys' ceramic seals. The take a while to = break in,=20 but seem to last very well. Rotor housing wear hasn't been a = problem=20 for anyone not using a 100,000 mile motor to start with. Ed = Anderson ran=20 into some trouble with ROTOR tip seal slot wear, check yours=20 carefully. I defer to Tracy, Ed and Lynn as to the corner = seals,=20 nobody I know has really worn out a motor. (including racers in = sedan=20 classes!)

Bill=20 Jepson

Bill, Tracy's seals are not ceramic. They are made from a super = secret=20 Unobtainium metal:)

Buly

To everybody on fly rotary, MEA CULPA. Incorrect listing for the = ceramic=20 seals!

Tracy's seals are listed as a "Proprietary alloy" that is not a=20 derivative of gray cast iron as most are. (Mazda's as well) I was = thinking of=20 ceramic seals. Then Tracy's seals and blurted that out.

Lynn, My dad was a ceramic expert. The softest true ceramic is so = hard=20 that it can only be machined using diamond grinding processes, hence = the=20 "stupid" prices. (I agree that the actual ceramic seals are hideously=20 expensive)

Monty, I do still say that carbon seals are not a good Idea = for an=20 aircraft engine. Go with something more durable like Tracy's or the = high=20 priced ceramic. Fortunately for us Tracy's seals are getting good = reports from=20 the car guys using them at ridiculous RPM and pressure. They should = last well=20 in our engines. Tracy's seals are much cheaper as well so let's get=20 some!

Buly, I am planning to start an UNOBTAININUM mine real soon, = wanna=20 buy stock?

Bill Jepson

True, the seals are made of unobtainium : ) But it gets=20 worse. Will soon introduce nitrided unobtainium seals. = This is in=20 response to the drag racing maniacs running 30+ pounds of boost with=20 occasional detonation. The seals still don’t break but = they can be bent=20 downward in the middle when at high temperature and detonation slams = them=20 down, bottoming them out on the spring seats. The nitrided = seals=20 retain their strength at higher temps.

Tracy

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