If you don't know what a rocket stove is, have a look at "rocketstoves.com" or search at Youtube where there are tons of very good videos to get inspiration from.
Step 1: Material List
1x oval bucket with lid
1x stove-pipe 120mm x 1 m
1x stove-pipe 130mm x 50 cm
10l hydro clay for hydroculture-plants
2,5 kg chamotte mortar
Everything costs about 35 EUR
bucket (for mixing the mortar)
bucket with the same shape as the bucket for the stove but slightly smaller
Step 2: Mark the Holes
Step 3: Cut Out the Holes
Step 4: Insert the Pipes Into the Holes
Step 5: Make the Bottom of the Stove
Mix the mortar with water so it has the consistency of ketchup. Fill the bottom of the bucket with hydroclay ( about 2 cm high) and then pour the clay pearls into the mortar. Mix it well and pour it back into the bucket.
Step 6: Make the Stove-walls
Again, mix mortar and clay pearls. Then insert it into the stove and fill the gap between the outer bucket wall and the inner bucket with the mortar-clay-pearl mix. Compress the clay-pearls with a stick to prevent air bubbles in the wall. Let the mortar sit for at least 24h.
Step 7: Remove the Inner Bucket
Step 8: Finished!
Step 9: Conclusion
After several months and using the stove a couple of times I can tell you this:
- The draft often starts in the wrong direction i.e. suction through the cimney. You can prevent that by blowing into the filling hole or by starting the flow by pouring some flamable liquid down the chimney and light it.
- The filling hole gets clogged easily by the ashes or coals and it limits the draw
- the thin metal of the bucket gets brittle after a while and because of the steel is covered with zinc its everything but healthy what comes out of the chimney on the first fires
At least it was fun to build and I learned a couple of things, but definetiv better invest you time in building a REAL rocket stove.