Re: engineering problem
I had the same idea as halucin8 about the keel. I was thinking to just put a rudder and position it where it will go all the way around the fountain at the same angle.
As far as power goes, it's going to be hard to figure out how much thrust you need and how to control it to use as a propellant. Not to mention a 12oz. co2 tank is very heavy. When you say RC, does that mean no electricity or it can be electric and just not remote controlled?