Bill Jepson wrote:

I understand many of the problems seen by engine bolts in rotaries. In my
daily job I have come across the use of Belleville washer/springs as a
means of maintaining a tight joint in systems that show a large delta T.
Cryogenic systems are where I first saw them used. (We use LN2 cooled
valve baffles in our systems) These high stiffness bellevilles are also
used in high temp and pressure joints like steam valves. The problem is
the same as ours, high pressure, large changes in temperature etc. I
know this won't prevent resonant freq. problems of course. Keeping a
more constant pressure on the seal surfaces does protect seals. The
threads are protected as well. A very small amount of planned travel
protects the bolts from stretch also. Allowing small controlled
expansion seems a perfect fit for the rotary. Bill Jepson

 PS I purchased the other 20B Alan had. I'm also interested in
following up on aluminum end housings and intermediate housings. The 20B
power to weight would be awesome with aluminum side plates! There's more
I want to talk about, but as you are at OSH right now it can wait for
later. WRJ

 
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