How- to Build a Rocket Stove. For earth- friendly cooking!

A kitchen space is probably one of the most important spaces for a home and even more so for a community space. Its where family, friends and visitors spend quality time. For us its also a gathering place for sharing ideas, socialising and where our produce will be transformed into delicious, off-the-farm meals. So needless to say, the cooking stove is an important part of our farm.

So, how can we build kitchen stoves that promote community cooking, are super efficient, use less heat, provide more heat and don’t leave us stinking of smoke? Our awesome permaculture interns had the answer…”Lets build a Rocket Stove!!!”  A Rocket Stove is mega efficient, really fun to build, it doesn’t cost the earth, can be built out of recycled materials and is a great activity for kids – especially if you’re planning to use and make your own mud mixture to build with like we did! (Tell them you’re building a rocket anything and they’ll be in!) If you already have a stove, consider building one of these for your outdoor space, bbqs, or a portable, down-sized one for camping. Just ensure, that if you build a bigger one its under a roof for rain protection.

Brianna, our mega talented intern, made two rocket stove designs for the farm as an experiment to see which is better in terms of efficiency, practicality and cost and for educational purposes. We built two stoves of the 1st design, and 1 of the 2nd design. So far, its looking like Design 2 is going to work better. You’ll find out why in a minute..

Rocket Stove Design 1

There are some elements of both designs that are the same. These include: a mud and brick foundation, a metal door to control air flow, an ashtray and metal grid which ensure the entry point doesn’t get clogged and an L tube. However, in this design we used a large metal barrel, which doubles as a cooking surface and insulation. We added an extra thin brick insulation layer to protect people from getting burnt whilst they’re cooking and we placed the exhaust pipe at the bottom of the barrel.

Permaculture Design Rocket Stove 2.

Materials you need:

Soil, sand, straw, cow manure and clay to make your mud mortar, and if you’re ambitious your bricks too,
Adobe bricks (if you’re not feeling that ambitious),
Metal Barrel for cooking surface (its too late for us now, but I strongly suggest sanding off the paint before using it),
3 metal pipes- 2 for the L tube and 1 for the exhaust pipe (some welding will need to be done here),
Metal tray and metal grid (we welded scrap metal sheets to make the ashtray and small metal rods to make the grid).

Rocket Stove Design 2

In the second design we decided to use the metal bricks as the primary insulation, a smaller metal cylinder for concentrated heat in the centre and a seperate metal sheet as the cooking surface. In this case we will be welding the exhaust pipe onto the edge of cooking surface instead of at the bottom, so as not too lose excess heat. This design uses more bricks, but because the metal sheet is flatter than the cooking surface in the 1st design and the heat is more concentrated, we think it will end up being better to use.

 

Permaculture Design Kul Kul Farm

Getting down and dirty

1. Source your metal, preferably from a scrap yard and send to a welder, or weld it yourself. Some bits will need a professional’s help.

Permaculture natural building kul kul farm

2. Mix soil, sand and clay. Step, jump and dance on this mixture until it begins to combine. Tip: Break up your clay, add a little water and let it sit overnight before the big building day, this makes it easier for mixing, otherwise you’re in for a workout! Add the cow manure and straw gradually, in bucket size quantities. You will know the mixture is ready when you can roll it up in a ball, or when you step in the mixture barefoot you can see you toes.

Mud mortar- Rocket Stove Building

4. If you’re as keen as our interns, make little wooden or bamboo block stencils, place the mud mixture in (once ready) and leave the blocks to dry.
How to make mud bricks, Kul Kul Farm
5. Set your mud brick foundations in a circle. For design 1 add the L tube and exhaust pipe, for design 2 only add the L tube. Set bricks in a square for your fuel input/ combustion chamber.
Permaculture building Kul Kul Farm

 

6. Add 4 layers of brick with mud mortar. Use broken or cut bricks and mud to fill in the gaps. For design 1 place the metal barrel on top and a wire mesh on the outside of the barrel for extra insulation, add a thin layer of mud mortar and brick . For design 2 continue to set the bricks and mud mortar till you reach 80cm, leaving space in the centre for the cylinder and metal sheet.

Build a super simple Rocket stove

7. Lay the bricks with mud mortar in a square to create the fuel entry chamber. To this for both designs.

8. For design 2 add the exhaust pipe to the cooking surface/ metal sheet and weld it together.

CIMG2319

9. Leave the stoves set for 3 days, lighting small fires with small twigs to help speed up the drying.
Permaculture DIY Kul Kul Farm

Learn more about renewable energy in our upcoming Permaculture Design Course this September 21 to Oct 6th.

 

Check out these short clips of us building the rocket stoves as part of our Rocket Stove Building Workshop last week.

 

5 responses to “How- to Build a Rocket Stove. For earth- friendly cooking!

  1. Great inspirational initiative to reduce challenges our communities are experiences because of climate changes!

  2. Thank you very much for this information. Will be building our own for our youth cafe in Zwelihle community in Hermanus

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