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a thought ocrrured to me way back when I had lots of time on my
hands to brainstorm.
I remembered the copper disk inside a chicken incubator and how it
was helium filled and would expand or contract and turn on or off
the light bulb and maintain a temperature in the incubator within a
1/2 degree range.
could such a disk also be used to in a Stirling engine since it
seems to move in and out a good deal with just a 1degree temperature
change
thanks guys

We appreciate your post and thinking 'outside the box.' I'm at a loss at the moment to see how the thermstat principle could be applied to a Stirling engine.

Some Stirling engines have been hydrogen filled and pressurization has also been used to improve performance. All suggestions are read and given consideration whenever possible.

There have been Stirling-cycle engines in which diaphragms or bellows have been used in place of pistons. The Harwell thermo-mechanical generator or Themodyne, developed in the late 60's and early 70's, is one example. Marc de Piolenc, Iligan City, Philippines