X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp110.sbc.mail.mud.yahoo.com ([68.142.198.209] verified) by logan.com (CommuniGate Pro SMTP 5.0c1) with SMTP id 689290 for flyrotary@lancaironline.net; Thu, 01 Sep 2005 14:36:55 -0400 Received-SPF: none receiver=logan.com; client-ip=68.142.198.209; envelope-from=dcarter@datarecall.net Received: (qmail 89883 invoked from network); 1 Sep 2005 18:34:36 -0000 Received: from unknown (HELO davidsdell8200) (dcarter11@sbcglobal.net@67.41.160.246 with login) by smtp110.sbc.mail.mud.yahoo.com with SMTP; 1 Sep 2005 18:34:35 -0000 Message-ID: <052401c5af23$cb504a00$6401a8c0@davidsdell8200> Reply-To: "David Carter" From: "David Carter" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Rational for TES "O" Rings Date: Thu, 1 Sep 2005 12:34:31 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0521_01C5AEF1.802E0C60" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0521_01C5AEF1.802E0C60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Rational for TES "O" RingsAbout "the o-rings raising the = oil temp" - I've seen more than one post asking about that. The way I = read that is, "The TES o-rings can tolerate higher oil [or rotor or = housing] temperatures" - not that they "raise the oil temperature". I = frequently "open mouth and insert foot" in these forums, not quite = getting the sense of some of the conversations. Just trying to be = helpful - sometimes my "helpfulness urge" exceeds my "intelligence or = understanding". Sorry if I've missed the point. David ----- Original Message -----=20 From: Mark R Steitle=20 To: Rotary motors in aircraft=20 Sent: Thursday, September 01, 2005 9:25 AM Subject: [FlyRotary] Re: Rational for TES "O" Rings =20 =20 =20 I don't know how you figure the TES seals could raise the temp but I = am concerned at how stiff they are and in the application of the rotors = I think the seals need to be softer and more flexible but that's just an = eyeball engineers point of view, the Viton seals have worked just fine = for me and in my early days of sorting things out I was running very = high oil temps and still had no problems with the O-rings, if it works I = don't fix it. I am however using the TES O-rings in the rotor housing and like them = and will stick with them but this is an application where I don't think = they need to be flexible as with the rotors but then again I am just an = eyeball engineer. Ken Welter =20 Ken, When rebuilding my 20B, I used TES o-rings on both water and oil. I = have a little over 9 hours of light running (ground runs only) on the = engine with no apparent problems. The one thing I think we need to = realize with the oil o-rings is their proximity to the very hot rotor = surfaces. Lynn has stated that under heavy loads the rotors can get to = 450* or higher. Since the oil o-rings are in the sides of the rotors, = very near the hottest part of the rotors, I suspect they could easily = see temps higher than what we're reading on the oil temp gauge. I don't = recall seeing any temp figures that have actually been measured for the = oil o-rings. I don't know how we could measure that, but if we had that = information it could answer the question of whether or not TES oil = o-rings are needed there. I figured it was cheap insurance, so I used = the TES o-rings for both the oil and water locations. =20 Mark S. ------=_NextPart_000_0521_01C5AEF1.802E0C60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: = [FlyRotary] Rational for TES "O" Rings
About "the o-rings raising the oil = temp"  -=20 I've seen more than one post asking about that.  The way I read = that is,=20 "The TES o-rings can tolerate higher oil [or rotor or housing] = temperatures" -=20 not that they "raise the oil temperature".  I frequently "open = mouth and=20 insert foot" in these forums, not quite getting the sense of some of the = conversations.  Just trying to be helpful - sometimes my = "helpfulness urge"=20 exceeds my "intelligence or understanding".  Sorry if I've missed = the=20 point.
 
David
 
----- Original Message -----=20
From: Mark R Steitle
Sent: Thursday, September 01, 2005 9:25 AM
Subject: [FlyRotary] Re: Rational for TES "O" = Rings

 

 

 

  =20 I don't know how you figure the TES seals could raise the temp but I am=20 concerned at how stiff they are and in the application of the rotors I = think the=20 seals need to be softer and more flexible but that's just an eyeball = engineers=20 point of view, the Viton seals have worked just fine for me and in my = early days=20 of sorting things out I was running very high oil temps and still had no = problems with the O-rings, if it works I don't fix=20 it.

 I am however using the TES = O-rings in=20 the rotor housing and like them and will stick with them but this is an=20 application where I don't think they need to be flexible as with the = rotors but=20 then again I am just an eyeball = engineer.

  Ken=20 Welter

 

Ken,

When = rebuilding my 20B,=20 I used TES o-rings on both water and oil.  I have a little over 9 = hours of=20 light running (ground runs only) on the engine with no apparent = problems. =20 The one thing I think we need to realize with the oil o-rings is their = proximity=20 to the very hot rotor surfaces.  Lynn has stated that under heavy = loads the=20 rotors can get to 450* or higher.  Since the oil o-rings are in the = sides=20 of the rotors, very near the hottest part of the rotors, I suspect they = could=20 easily see temps higher than what we=92re reading on the oil temp = gauge.  I=20 don=92t recall seeing any temp figures that have actually been measured = for the=20 oil o-rings.  I don=92t know how we could measure that, but if we = had that=20 information it could answer the question of whether or not TES oil = o-rings are=20 needed there.  I figured it was cheap insurance, so I used the TES = o-rings=20 for both the oil and water locations.

 

Mark=20 S.

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