Bill Broon

Yeah cool i can pick up a bale of straw.

So this clay n perlite bake... where might one find a bit more detailed info on this stage of the construction?

Also my site for the ploytunnel is on a bit of a slope. Would it be better for the ducting to run uphill from stove, downhill or better levelling off the ground first?

Thanks heaps sorry to hijack the thread for a wee bit

The duct is the inner lining of a three part heat riser. Duct, perlite and clay, duct; the duct will burn out and leave the perlite and clay as the heat riser. when we wrote the book we had several types of heat risers in development the thicker was to give us a little bit of thermal mass Its not really needed and pipe of that thickness is way costly.

Awesome! So its making a mould and then it burns off. I likee very much! This gives me the motivation to get on this thing much faster. I have old bricks, ducting and plenty of hay (is this ok for cob?) and mud/soil/animal poo...

How weather proof would a standard rocket stove be? I can build the stove first and then the polytunnel around the stove. I expect heavy rain but no freezing conditions.

Thanks! Off to re-watch the videos again

Awesome videos!

I am collecting materials for a polytunnel and rocket stove and have some q's.

In the Evan's and Jackson book they specify at least 1/8th and preferably 1/4 inch thick stove pipe as the main heat riser. In the vids i see regular flue pipe being used which is thinner. Is this ok to use as i have plenty laying around but am finding it hard to source thicker steel pipe...

Also i am wondering if we could vent the co2 and water vapour directly into greenhouse. I have seen a video where a commercial tomato farmer increased his yield by around 500% by recycling (from a methane digester) his co2 back into GH.

Cheers!