Re: boat propulsion - miniature computer-controlled steam plant?

For what it's worth - I was thinking of
* de Laval turbine
* Ljungstro..m turbine
With Ljungstrom turbine, wondered if blades could be made on tips of rod
pegs set into the face of the disk.  The centrifugal force isn't in line
to sling the inserts out of their seats. ?
I wondered whether the revs would have been manageable.
Two contra-rotating discs would have been fine - two generators.
Presumably at those revs a couple of magnets embedded in each disk?
Idle speculation.
I got an "Arduino" embedded device working today.
Advantage me seeking jobs in processing - new mines opening up around
here (Cornwall).