X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mtiwmhc12.worldnet.att.net ([204.127.131.116] verified) by logan.com (CommuniGate Pro SMTP 4.3.6) with ESMTP id 611243 for flyrotary@lancaironline.net; Thu, 21 Jul 2005 23:35:26 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.131.116; envelope-from=keltro@att.net Received: from 204.127.135.75 ([204.127.135.75]) by worldnet.att.net (mtiwmhc12) with SMTP id <2005072203344211200a98kme>; Fri, 22 Jul 2005 03:34:42 +0000 Received: from [209.247.222.86] by 204.127.135.75; Fri, 22 Jul 2005 03:34:41 +0000 From: keltro@att.net (Kelly Troyer) To: "Rotary motors in aircraft" Subject: Re: TES "O" Rings Date: Fri, 22 Jul 2005 03:34:41 +0000 Message-Id: <072220050334.234.42E06951000224B3000000EA2160466648019D9B040A05@att.net> X-Mailer: AT&T Message Center Version 1 (Feb 14 2005) X-Authenticated-Sender: a2VsdHJvQGF0dC5uZXQ= MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_234_1122003281_0" --NextPart_Webmail_9m3u9jl4l_234_1122003281_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit George, Just what I was looking for !! Now I wonder what percentage of the groove area that "Creavy" says needs to be filled and do the teflon- silicon O-rings expand (grow) under heat ?? -- Kelly Troyer Dyke Delta/13B/RD1C/EC2 -------------- Original message from "George Lendich" : -------------- Kelly, I see what you mean - a quick check of areas reveal a ratio of area of grove to "O" ring cross sectional area as:- 1. .093 = 1: .924343 ( for the .065x .113) proven fit - outer "O" ring!! 2. .098 = 1: .859 ( for the .065x .135) OK 3. .1 = 1: .8945868( for the .065x .135) OK 4. .103 = 1: .9490484 ( for the .065x.135) TOO BIG. Given the crush 'cross section' is different, but the Teflon flows under that pressure, 2 and 3 should be OK - I'm using your dimension measurements. George ( down under) George and All, I just realized I did not answer your question.......I wanted to find a cross section of the PFA-SIL that was close to the .098 as called out in earlier posts for the inner coolent O-ring......I measured the coolent O-ring grooves of my housings........Both inner and outer grooves measured .065 thousands deep.......Width of the inner was.135 thousands and width of the outer was .113 thousands........Now can someone much better in math than me figure what diameter of O-ring can we use in the inner groove wthout causing a hydraulic rupture......The inner coolent O-ring sees more heat and pressure than the outer O-ring !! On paper it appears that a .093 thousands O-ring has enough crush according to the depth of the groove but it is free to rattle around in the .135 width.........IMHO -- Kelly Troyer Dyke Delta/13B/RD1C/EC2 -------------- Original message from keltro@att.net (Kelly Troyer): -------------- George, I was trying to find out what diameters (cross section) of the high temp (500 degree f) PFA-SIL was available.........I wonder if the (450 degree f) FEP-SIL might be good enough for the coolent O-rings but use the high temp for the rotor side seal O-rings........If the coolent seals ever see even 450 degrees the aluminum rotor hsgs will probably start to crush !! "Opinions" -- Kelly Troyer Dyke Delta/13B/RD1C/EC2 -------------- Original message from "George Lendich" : -------------- Kelly, What was that in relation to. George ( down under) Group, More info from "Creavey" -- Kelly Troyer Dyke Delta/13B/RD1C/EC2 From: "Jeff Chrysler" Save Address Reminder To: "Kelly Troyer" Subject: RE: Sil-PFA .098 availability Date: Thu, 21 Jul 2005 17:12:27 +0000 [View Source] PFA is available in .103” cross section. Jeff From: Kelly Troyer [mailto:keltro@att.net] Sent: Thursday, July 21, 2005 11:48 AM To: Jeff Chrysler Subject: RE: Sil-PFA .098 availability Jeff, Thanks Jeff........What diameters are available in PFA-SIL........ .100 would probably work if available. Kelly Troyer --NextPart_Webmail_9m3u9jl4l_234_1122003281_0 Content-Type: text/html Content-Transfer-Encoding: 8bit
George,
     Just what I was looking for !! Now I wonder what percentage of the
groove area that "Creavy" says needs to be filled and do the teflon-
silicon O-rings expand (grow) under heat ??
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2




-------------- Original message from "George Lendich" <lendich@optusnet.com.au>: --------------

Kelly,
I see what you mean - a quick check of areas reveal a ratio of area of grove  to "O" ring cross sectional area as:-
1. .093 = 1: .924343 ( for the .065x .113) proven fit - outer "O" ring!!
 
2. .098 = 1: .859       ( for the .065x .135) OK
3. .1    =  1: .8945868( for the .065x .135) OK
4. .103 = 1: .9490484 ( for the .065x.135) TOO BIG.
 
Given the crush 'cross section' is different, but the Teflon flows under that pressure, 2 and 3 should be OK - I'm using your dimension measurements.
 
George ( down under)
George and All,
       I just realized I did not answer your question.......I wanted to find a
cross section of the PFA-SIL that was close to the .098 as called out
in earlier posts for the inner coolent O-ring......I measured the coolent
O-ring grooves of my housings........Both inner and outer grooves
measured .065 thousands deep.......Width of the inner was.135 thousands
and width of the outer was .113 thousands........Now can someone much
better in math than me figure what diameter of O-ring can we use in the inner
groove wthout causing a hydraulic rupture......The inner coolent O-ring sees
more heat and pressure than the outer O-ring !! On paper it appears that
a .093 thousands O-ring has enough crush according to the depth of the
groove but it is free to rattle around in the .135 width.........IMHO
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2




-------------- Original message from keltro@att.net (Kelly Troyer): --------------

George,
     I was trying to find out what diameters (cross section) of  the high temp
(500 degree f) PFA-SIL was available.........I wonder if the (450 degree f)
FEP-SIL might be good enough for the coolent O-rings but use the high
temp for the rotor side seal O-rings........If the coolent seals ever see even
450 degrees the aluminum rotor hsgs will probably start to crush !!
 
"Opinions"
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2




-------------- Original message from "George Lendich" <lendich@optusnet.com.au>: --------------

Kelly,
What was that in relation to.
George ( down under)
Group,
   More info from "Creavey"
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2



From:   
"Jeff Chrysler" <jeff@creavey.com>     Save Address     Reminder
To:    "Kelly Troyer" <keltro@att.net>
Subject:    RE: Sil-PFA .098 availability
Date:    Thu, 21 Jul 2005 17:12:27 +0000   [View Source]


PFA is available in .103” cross section.

 

Jeff

 

From: Kelly Troyer [mailto:keltro@att.net]
Sent: Thursday, July 21, 2005 11:48 AM
To: Jeff Chrysler
Subject: RE: Sil-PFA .098 availability

 

    Jeff,

      Thanks Jeff........What diameters are available in PFA-SIL........  .100

would  probably work if available.

 

  Kelly Troyer


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