I hope this is the definition of a j-tube rocket. Its a j tube with a 20ga barrel over the riser, hot plate is used as lid of barrel. Its my second "test" rocket. Will build for keeps real soon based on what I learned.
I started a j tube here at basecamp, and boiled a gallon of water in a pot. It was pretty fun and quick! The bottom of the pot got all creasotey, so I should perhaps have burned the paper up, then once the fire was started put the pot on. I'll have to try it that way next time.
(Edit because I missed a pic when I was posting a moment ago)
"Be a treasure to the poor, an admonisher to the rich, an answerer to the cry of the needy... Be as a lamp unto them that walk in darkness..." - Baha'u'llah, Epistle to the Son of the Wolf
These are my starting materials inside the rocket j-tube before I started the fire.
These are my starting materials in the rocket j-tube after I started the fire.
This is an additional load of wood that I put in the rocket j-tube!
This is a picture of the water I boiled on the rocket j-tube!
As other people have encountered, I also encountered issues with creosote build up on the bottom of the pot. Also, while using longer sticks of wood, it requires a little bit of attention to push down the wood as the bottom burns, because if the fire gets too high up the wood, it can smoke back a bit.