flyrotary@lancaironline.net Mailing List Archive

Kelly,

It would seem by my findings that an "O" ring with a cross section of approx .093 to .098 need a groove .071 to .074 deep and .122 to .126 wide.

We have .065 deep to 113 to .135.

This is better suited to the TES type "O" ring, as it seems harder to crush.

Sorry my info can't be more accurate than that!

Needless to say neither can the actual "O" rings as they vary from .095 to .098 for the .093 size i.e. + or - .005. This leads me to think that the + side is more the norm.

My guess is that the .098 will be good for the inside groove, anything bigger may be too big.

OK!

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