Algodoo

Very interesting, how does it work?
EDIT: Oh my god, this is the most powerful engine EVER

My word! without the rubber belt, it rotates up to 880 revolutions per second!!!

it works with magnetism. Look at the blue/red circle^^
and thanks for the comments

there must be scripting in this? i tried to make the same thing and it didnt work

http://img830.imageshack.us/img830/8397/makeyourownelectroe.mp4
this is a tutorial save it on your computer and opens with windows mediaplayer

this can be used in a lot of thinges

electro magnetism

It's stable at unreasonably high speeds, but produces very little actual power. I built one that's stable up to 6k rad/sec (balancing is key), but it only takes a 100Nm motor to stop it. Since I don't think it's possible to build a transmission that can step down speeds that high, it's hard for me to see a use for this. It is pretty cool though.

So, a challenge: can anyone get one of these to produce, say, at least 200Nm of power at <6kRPM (not 6k rad/sec, which is more like 60k or 600k RPM, not sure which)?