[IronJack]

I guess I don't understand the construction of this device. I'm under the impression that the balls themselves are beign whirled in some kind of large disc or cylinder. There may be an imbalance in that rotating mass when one of the balls is released, but that isn't the same as recoil.

However, my vision of the device may not be accurate either.

[Doctor Stochastic]

Another example here.

[Dinsdale]

"Young man, in this house we obay the laws of physics!" Homer Simpson

It does'nt mater what kind of contraption you use to get something up to speed.

Think of this problem. Put a ball trap in front of your device, run the balls back into the gun.

Do you have a reactionless drive? (i.e does the regular recoil of the balls hitting the trap now pull the whole thing forward?)

If you do you are rich beyond averace and have brought the stars into reach. I don't think you do.