There have also been atempts to use gravitational principles in bicycles to gain power for driving. I don`t know if this has been successful. I have seen these bikes, but not testet them. Because of the fact that the principle of the "Trägheitsaktives Schwungsystem" can also be used for inertial propulsion I think it shoul be possible to do so (You just have to put all the moon-weights to the same direction). OK, now have a look at some pictures:

FAHRRAD   Fahrrad alt   Fahrrad neu1   Fahrrad neu2