yes, it works by 1 side of the engine allways being heavier than the other so without gravity there wouldn't be a difference in weight and the engine wouldn't work.
simple, TOO simple (evil laugh and dramatic music)
all jokes aside this is awesome. it might not be realistic but it looks really cool
5/5 for content
3/5 realisticness
and 10/5 for showing that noob that ripped off your scene who's boss (that would be you) keep having Phun (or algodoo)
interesting, hope emil/algodoo company fixes this in an upcoming version.
they probably will they fixed a bug that I reported about 1 year ago in the recent update