----- Original Message -----
From: "William" <wschertz@ispwest.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, September 24, 2003 9:23 PM
Subject: [FlyRotary] Re: DIE the short Answer


> Ed,
> There is a sealing technique that relies on surface tension that might
work,
> tolerance would not have to be super accurate.
>
> Visualize a small groove on the inside of the outer tube, and then fill it
> with a high temperature silicone oil that is loaded with very fine iron
> particles.  put a magnet around the tube, and the particles stay in the
> location of the magnet, and the surface tension of the oil to the
particles
> holds the oil where the particles are.  Then slip the inner tube into the
> outer tube, and the oil-ring acts like an 0-ring, but with very low
> friction.
>
> Bill Schertz
>

Thanks, Bill.

Boy! that is ingenious.  Never in a million years would that ever have cross
my mind.  Do you have any sources of additional information on that
technique.  In other words, what tolerances might be important? size of the
particles? etc. Its effective temperature range - although I presume that
with silicon oil the range is wide.

 I sure would like to research it some more - does it have a name?

I'm going try that at home!{:>)

Ed Anderson