![j shape rocket burner j shape rocket burner](https://20401z3eigij1ugd3g2szg83-wpengine.netdna-ssl.com/wp-content/uploads/2016/11/oven-3.jpg)
We gave fire to the firebox and stood back. In addition, we made a higher hole in the Super Adobe wall to fit the new exhaust pipe.Īs before, we made the majestic march to the thematic throne. We replaced the ash insulation with lava rock. We made the changes and added a cool horseshoe base to stand the stove. We extended the exhaust from the 3-foot length to 15 feet including a couple small turns by adding “duct” piping we purchased at the local hardware store. As a backup thought process, If thought we needed a Round Three, we would increase the size of the firebox to 6” diameter. We redesigned the firebox to enter from underneath.
![j shape rocket burner j shape rocket burner](https://i.pinimg.com/474x/fd/21/53/fd2153529c40fe1a616945703532337c--rocket-stoves-wood-stoves.jpg)
The exhaust was too short which caused air to blow back into the stove instead of exiting out. In addition, we think that the draft would work better if the exhaust was longer and mostly pointing up. We discovered we built the firebox higher than the exhaust so we did not start the draft process properly. We pulled the stove apart and examined the design. Sure, we added some of our design elements but what did we leave out or miss? What went wrong? We thought we followed the internet examples very carefully. We carried our kingly creation back to the drawing board and began to debrief the problems. We extinguished the small fire and dissembled the rocket stove from the wall. Smoke backed up in the room making it impossible to stay inside. We anxious lit a small fire in the firebox expecting to feel the warming heat from the rocket stove combustion chamber. We carefully cut a hole in the lower section of the super adobe wall and placed the horizontal exhaust pipe through its ordained gapping orifice. We gleefully carried our creation to its rightful tile throne, precisely placed to raise the stove off the common cob floor. We added a 10 inch saw blade to the top of the unit. We were not too concerned, thinking that the outdoor conditions with wind was skewing our effectiveness. It had some problems with draft but when the wind kicked up it would back flow and reverse the burn direction. It was only 16 inches in diameter to fit in a small space. The height of the unit was to be about 2 feet. The firebox was designed to enter horizontal into the side of the outer casing of the chamber to give it a low profile. All these pieces were assembled with the idea of making it compact and useful for heating a small room. Our designed then was to vent out the back of the chamber casing straight to the outside withno venting upwards. Our research indicated that the exhaust was to be mainly steam, CO2 and a little smoke. Because the rocket effect of the fire exhaust out of the top of the firebox is so hot, we used an old water heater section for the outside casing of the chamber. The second section of the combustion chamber is a cover that can take some heat. Some of the videos from the internet showed builders using cob and perlite. After completing the weld of the “J” shape firebox, we filled the bucket with ash for insulation and covered it with a cut out section of an old appliance from the “Magical Metal Pile”. We used a steel 5-gallon can to insulate the long exhaust section of the “J” shape. This part of the project required an insulated internal section and cover to complete a chamber. They needed to work together hand in hand. We could not finish the firebox until some of the combustion chamber was completed. It was a little tricky welding the pieces together in a small application. The cool thing about the “J” shape design is that the fire will burn sideways from a draft caused by the exhaust. We cut the pipe at 45-degree angles and welded the pieces together at right angles. We started by building a firebox from 4.5 inch steel pipe. When we need something, it seems to “magically appear” in our metal recycle pile. Living on a homestead has its advantages when it comes to finding parts for projects. Three main parts were needed: a firebox, combustion chamber and exhaust.
![j shape rocket burner j shape rocket burner](http://aprovecho.org/wp-content/uploads/2020/09/09-17-NL-vented-rocket-jet-flame-sats.png)
We started the design for our space heater. Why not scale down the big designs we were seeing on the internet and make something to fit a small room.
![j shape rocket burner j shape rocket burner](https://i.pinimg.com/originals/0b/ad/da/0badda34081f7aff86d233a2660ce9ad.jpg)
J shape rocket burner portable#
Something more portable and unobtrusive seemed more appropriate for our needs. A rocket stove to heat water is a better idea but in the meantime, we decided on a smaller, more fun project to propel us into the “rocket” adventure. Looking for an excuse to build one of our own, we considered the effectiveness of the radiant heat floor in the Earthbag Structure. We quickly got busy searching the internet for stove ideas. We want to thank our neighbor, Vicky, for introducing us to rocket stoves.