JB> RJT> I have a number of yahoo lists flowing in here for various aspects of
JB> RJT> machining and CNC stuff,  and the subject seems to come up
JB> RJT> with fair regularity.  People are building such engines,
JB> RJT> though I don't know if they're actually using them to do
JB> RJT> any useful work.

JB>The one I saw was used for submarine propulsion, and reportedly works totall
JB>silently.

 At least more silent tyen the Hydrogen Peroxide powered internal
 combustions the British tried many years ago. And becaue it is a slow
 speed device it would be quiter then even a steam turbine because of
 the elimination of the Reduction gear noise.
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 þ SLMR 2.1a þ This note from El Cajon California USA