SpudFiles

I used to do this with oxygen and gasoline or acetylene, no water. I was crazy enough to put some lead fishing weights or washers on top, along with fins and a nosecone. I'd say I got 300+ feet, but that may be generous. No idea how high the weights (read: shrapnel) went when the bottle exploded, which was pretty much every other launch.

I had a real Rube Goldberg-esque remote ignitor, composed of a 35V, 100uF electrolytic cap, a full-wave rectifier running on 15V stepdown xfmr to charge it with, and an ignition coil from a Model-T Ford (no joke, my dad had it left over from his high-school science fair project!) housed in a wooden box.

Has anyone tried HHO (gas mixture produced by electrolysis of water) bottle rockets. I've seen some people on YouTube fill with HHO and ignite 2 liter bottles. I've done it with a thick 60mL bottle. Even at that small amount it is very loud.

You can also buy combustion water rockets from Estes