"Paul F. Dietz" wrote in message ...
Manfred Bartz wrote:

Do be aware that reactionless propulsion is mathematically equivalent
to a perpetual motion machine of the first kind (if the phenomenon
occurs the same way in any inertia reference frame.)

I keep hearing these kinds of statements. Please give me a practical
example
of how you could exploit a reactionless drive to make a perpetual
motion
machine.

Anyway, if you just use a light bulb as an engine, you've got
propulsion without having to carry a specific reaction mass.