Mike Rigby

How about if the mass was contained within the bell/heat exchanger? With channels for the gases to flow through?
Yes you would have to be careful not to bottleneck the flow.

Porn? Lol I wish. Wife would kill me!

It's an external building away from my house.
I'll post more info after I read the book

Thanks for the honest feedback.
Yeah the book is on the reading list.

Interesting idea of a double bell jar. Is this stacked or stood parallel? I have some ideas to change the design of number 2 however number 1 (the test) needs to be build first. Ideas like a heated air intake (similar to a few threads down), plenum chamber leading to multiple exhausts, etc. just see where the wind takes me.

Yeah I agree it's a small area but its what I have to work with. I don't think I'll be using any heat battery, just fins on the heat exchanger to save space.

I stumbled on this website whilst researching hobo stoves made from beer kegs but I loved the idea of controlling the exhaust fumes and more efficient burning of the rocket mass heater.

Morning/Afternoon/Evening all (depends where you are in the work)

I been looking at this forum for the last few months and have a head full of ideas on building various RMH and Stoves.
My first plan is to make a Rocket mass heater for my small workshop. Its just over 2m x 2m, and about 2m tall. its not a huge space but i plan on using it to work in during the winter months, and also as a drying room for laundry. Living in one of the wettest countries in the world (England), drying laundry can be a pain.
I've been collecting wood from trees i've been cutting down for a while now (still seasoning), and i've been accumilating parts to make the heater.
so far i have a small oil barrel, and a 13kg gas cylinder. The barrel will fit inside the cylinder.

so the plan is the barrel will hold the insulation for the flue/combustion chamber, and the cylinder will be upside down and used as the heat exchange.
only problems i'm having at the moment is the size of the combustion chamber/fuel feed/air feed/flue.
If i make the system from 3" box/tube section, does the air feed need to be included in this 3" or can i have an additional feed? i'm thinking more (controllable) air is better?
Also, does the exhaust need to be the same size as the rocket system? or can it be X% smaller?

Thanks for any replies

Mike