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X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf22aec.mail.bellsouth.net ([205.152.59.70] verified) by logan.com (CommuniGate Pro SMTP 5.0c1) with ESMTP id 688233 for flyrotary@lancaironline.net; Wed, 31 Aug 2005 15:17:43 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.70; envelope-from=13brv3@bellsouth.net Received: from ibm67aec.bellsouth.net ([65.6.194.9]) by imf22aec.mail.bellsouth.net with ESMTP id <20050831190943.VVWO15420.imf22aec.mail.bellsouth.net@ibm67aec.bellsouth.net> for ; Wed, 31 Aug 2005 15:09:43 -0400 Received: from rd ([65.6.194.9]) by ibm67aec.bellsouth.net with ESMTP id <20050831190942.FDXA17147.ibm67aec.bellsouth.net@rd> for ; Wed, 31 Aug 2005 15:09:42 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Rational for TES "O" Rings Date: Wed, 31 Aug 2005 14:09:43 -0500 Message-ID: <000001c5ae5f$8bdf23b0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C5AE35.A3091BB0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C5AE35.A3091BB0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I am of the opinion (yet to be proven ) that the use of TES seals = in the rotors may raise the critical temp for oil.......It is well known that = the 13B is most efficient with oil temps in the 160 to 200 F range and that = power suffers above these numbers........I do not advocate flying with oil = temps above those numbers but most of us will struggle with oil temps as we sort out our oil cooling systems.........My hope is that the TES seals = will provide a safety buffer for oil temp by preventing the rotor oil seals = from going away with short periods of over temp during test flying......The=20 same can be said for the inner coolent seal as well with the outer seal probably not a real problem (but they are less expensive than = stock)........ =20 =20 Hi Kelly, =20 I can't fault any of the above logic. When this discussion first came = up, I was thinking only of the coolant o-rings, and never once considered that = TES could be used for the oil seals. Assuming they work as well as they = should, I agree that it might help some to use them.=20 =20 I can't find the message now, but I believe Lynn or Leon told us that = the first failure from overheating the oil would be the soft material on the bearings. Can someone confirm this? What is the first thing to fail = when the oil temp gets too high? =20 =20 Cheers, Rusty (RV-3 tentatively sold) =20 =20 ------=_NextPart_000_0001_01C5AE35.A3091BB0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

I am of the opinion (yet to be = proven ) that=20 the use of TES seals in the

rotors may raise the critical temp for oil.......It is well known = that the=20 13B

is most efficient with oil temps in the 160 to 200 F range and that = power

suffers above these numbers........I do not advocate flying with = oil=20 temps

above those numbers but most of us will struggle with oil temps as = we

sort out our oil cooling systems.........My hope is that the TES = seals=20 will

provide a safety buffer for oil temp by preventing the rotor oil = seals=20 from

going away with short periods of over temp during test = flying......The=20

same can be said for the inner coolent seal as well with the = outer=20 seal

probably not a real problem (but they are less expensive than=20 stock)........

Hi=20 Kelly,

I can't fault=20 any of the above logic. When this discussion first came = up, I=20 was thinking only of the coolant o-rings, and never once considered = that=20 TES could be used for the oil seals. Assuming they work as well as = they=20 should, I agree that it might help some to use=20 them.

I can't find=20 the message now, but I believe Lynn or Leon told us that the first = failure=20 from overheating the oil would be the soft material on the=20 bearings. Can someone confirm this? What is the first = thing to=20 fail when the oil temp gets too high?

Cheers,

Rusty (RV-3=20 tentatively sold)

=20

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