Win a copy of The Ethical Meat Handbook this week in the Food Choices forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education skip experiences global resources the cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • r ranson
  • Nicole Alderman
  • Anne Miller
  • Pearl Sutton
  • James Freyr
  • Jocelyn Campbell
stewards:
  • Joylynn Hardesty
  • paul wheaton
  • Burra Maluca
garden masters:
  • Steve Thorn
  • Greg Martin
gardeners:
  • Jay Angler
  • Carla Burke
  • thomas rubino

How low can you go?

 
Posts: 9
Location: Central Oklahoma
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
This seems like a weird question, but how small can you make a rocket mass heater that functions like it is supposed to? Has anyone tired this?

Thinking of burying the heat chamber below the pizza stone bottom of, and exhaust piping in the walls of, a beehive oven.

RileyG
You know, the one with all the idiot ideas
{They haven't thrown me out of Oklahoma, yet}
 
gardener
Posts: 2245
Location: Southern Illinois
380
transportation cat dog fungi trees building writing rocket stoves woodworking
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
William,

This is a great question.  I personally have not built a rocket stove, but I have built a small TLUD kiln to make char.  The mini TLUD was based on an old 1 gallon paint can, the leftover can from a can of beans and two soup cans.  I tried this just to experiment.  Sure enough, it worked.  I had to tinker with it a little bit but I eventually got it to produce wood gas that burned completely and totally without any smoke at all.  And in the end I got a little black beans can worth of charcoal.

So given the my little experiment worked, I bet you could get a RMH in a compact package.  One issue worth noting though—my little TLUD took about 90 minutes from start to finish.  Possibly this is not enough time to fully heat your mass or cook what you want to cook.  But I think it is a great idea and I say go for it!

Eric
 
pollinator
Posts: 248
23
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I have only made 6” versions but I have read about a 3” one and several 4” systems however it seems pretty well documented that 6” or lager is the way to go as smaller systems are fickle and difficult  to operate.
 
Posts: 51
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I've seen more and more rocket stoves, especially mexican ones, fed by fans through small holes in the sides of the burn chamber.  Also, I've seen small can gasifiers, with a computer fan fed into the bottom, and slits cut in the top and holes at the bottom.
 
gardener
Posts: 2729
Location: Cincinnati, Ohio,Price Hill 45205
239
forest garden trees urban
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I believe Erica got a 3" one to work, but wasn't happy with the results.
Batchbox rockets can be shorter than originally thought and still operate well.
The riser can be roughly 3 timed system diameter with no real issues.
That makes for an 8" batch box with a 24" tall riser,  as measured from the base of the box, so fitting  it under an oven should be a non-issue.

Flip and John Anderson have done some of the earliest work on rocket ovens and even kilns,  and their rockets are all basic cob cooking rocket.

Here is a video of their work:






 
If I'd had more time, I would have written a shorter letter. -T.S. Eliot such a short, tiny ad:
Learn Permaculture through a little hard work
https://wheaton-labs.com/bootcamp
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!