Can vortex rings be dangerous?
I suppose you could say that. There is a patent in existance for a special type of torpedo that deliberately creates a bubble ring to increase the destructive power of the device. The big ring that you see around the central column of some mushroom clouds is just a huge smoke ring. And as I mentioned previously, many types of big guns make smoke rings when they fire. On the other hand, I have placed a version of my RingMachine device in a fishtank with a couple of goldfish, and they didn’t mind it at all.