Mailing List flyrotary@lancaironline.net Message #26277
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] Rational for TES "O" Rings
Date: Wed, 31 Aug 2005 14:09:43 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
      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
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)........
 
 
Hi Kelly,
 
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. 
 
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? 
 
Cheers,
Rusty (RV-3 tentatively sold)
 
 
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