Detailed pictures of the construction

of a rocket mass heaterBy josh , rocket mass heater at Organizmo, colombia

Not me in picture and not at Organizmo.

It is another rocket project in colombia that i am invovled in though ;-)

Preparing the area

First there is of plastic (pvc or similar) as a moister barrier. After that a layer of gravel a

laid fairly level. On top of the gravel i poured a thin layer of watery concrete with gravel on

top of everything and maintaining the level. Big rocks are layed on the border with concrete

to hold them in place.

This is all done to protect the cob and stove from moister from below and also raising It a

bit off the ground.

Laying a base for the bench

A course of bricks in concrete because

bricks is what i had, could be anything

sturdy enough,It is just to raise the bench

from the ground.

Since there are no connections for these pipes i used

scraps of metal and chicken mesh covered in

cement/cob mortar. (no- straw cob)

Laying out the flues these are ceramic pipes

Most common here is smoke ducts, they are

usually quite coslty and these were a good

dimension a about 8 inches.

These pipes determined the dimensions for the

rest of the stove.

Construction of the combustion

unit

Used in total

about 50 bricks

first course of bricks : make sure it is wide enough for the courses of

bricks and for the bricks that will hold the a barrel which you will see

soon. the hole you see is a ash pit.

base layer

these bricks are layed flat, this layer will determin

the length of the burntunnel. Need to measure this

before hand beacuase the bricks can be different.

Layer 1

Layer 2

This layer the bricks are stacked on

edge, around the entire layer beneath.

On this level i had to cut off one third of two

bricks to maker It work. Now it is ready for the

heat riser!

Layer 3

Creating the support for the barrel and

directing the gases to the pipes. I find

it easiest and strongest to do with

bricks. It can be done with rock ,cob, or

a combination of everything.

Can you see what is wrong with the picture above? No? Well the bricks should be

locked together like puzzle pieces. Ana-maria from organizmo reminded me! Bricks

stacked straight on eachother will flop over.

Creating barrel support and the

"bridge" to the pipes.

Now the bricks are stacked

properly and mortared

together with sand/clay.

You can see the bridge to

the pipes being created.the

Hole there is going to be the

cleanout.

The bricks are plastered in and out, smoothed

out And the bridge is made wire mesh and

cobbed up.

This inuslation method is not

reccomended and is experimental. The

heatriser is ceramic tubing, the

insulation is a charcoal mix with wet

clay and put In a chicken wire

cylinder. Other tested insulation

methods are advised. It is what was

available...

Heatriser and insulation in place!

In-between hobbies include, Burning off paint from the

barrel, mixing tons of cob (literally) and tincering with mini rocket

experiments.

Putting up the barrel and giving her a test run! This gives you a final chance

make adjustments like: putting the barrel at the desired height or the height

which gives the best draft. Ok it works! Now what?

Test drive

Sculpt a bench!

Ready for plaster!

After testing a few batches here is the best i came

up with:

plaster for top half

1 part clay

2 part sand

1 1/2 cow manure

1 part flour paste

A few handfuls

plant fiber ( fique)

Plasters

Platster for bottom half

1 part clay

2 parts clay

1 part clay soil

1 part rice husks

ready to go!

This slide is ment to assist you if you are thinking of creating a rocket stove, or just as

inspiration. It is not a detailed description it merely shows the main steps through pictures.

If you search the web for rocket mass heater you will find the dimensions you need for

your stove. I highly reccomend reading the book about rocket mass heaters.

Alright! Hope you are making one right now! If not and you want to, send me an email

and i can hopefully help you out!

I am willing to come hold a rocket mass heater workshop with you as well!

Thank you all at Organizmo for the help and support with the creation of this stove!

http://organizmo.org/

Joshua Roxendal

joshua@roxendal.com

Http://pemakultur.ihop.nu