On perpetual motion machines in Traveller

Bart, the fact that the thruster plate is a perpetual motion machine
as it's described in the SOM has been well-documented by Dow Rieder,
who's also coughed up some very entertaining descriptions of how an
ordinary starship can generate enough power to run a planet's cities....
Maybe he could repost (hint hint), or James could point to an archive
number (hint hint)?

metlay