Simple barrel rocket heater - without a mass

Hello,
I am a new member and a new person to wood heating.

I have come across this site because I am looking at heating options for keeping people warm outdoors at a Christmas in July event in Australia.

I started off with the simple cut barrel and burn wood. Looking on line I came across a barrel with cast iron door and chimney. Something I could easily make using just steel. The barrels would of been a one off use.

Doing more research I came across a rocket barrel and then the rocket barrel mass heater.

Awesome and surprised I have not seen more of them here....but that is another story.

My question for now is...
Are their any simple plans to make a rocket barrel heater without the mass?

I will not have time to make several of these. Also the event is in a state forest. Approx. 150 people so looking to make a couple of heaters.

Thanks for your time in replying.
I have done a search but not found what I am looking for.

Chilly

20th thread has a couple ideas:
https://permies.com/t/35403/rocket-stoves/portable-RMS

A lot of people test their design with a setup outdoors, without adding mass to the exhaust. No reason it couldn't be as permanent as you like.

Chilly : Two things -

One : you are creating one of the most efficient Wood burning units ''In the World " and then letting most of the heat radiate to the outdoors,
Simply Burying your exhaust pipe in a box of sand/Thermal Mass is preferable to allowing 60% of your heat to be exhausted to the environment !

Two : The barrel is vital to achieving even the 40% of prompt heating expected off of the RMH, No barrel and all you have is a way to burn wood
efficiently, and Zero Way to provide useful Warming !

When the barrel goes on the vertical chimney must go up, This is a mandatory step that is required by the Physics of the RMHs operation, You
can not even expect to test your RMH (out of doors ) without following up the setting in place of the barrel w/o immediately erecting your vertical
chimney !

Cast your net around you, hopefully you will find someone with previous experience in RMH building in time to make and test a few conventional
designs before your july event ! For the craft !

Think like fire, flow like a Gas, Don't be the Marshmallow ! As always your comments and questions are solicited and welcome ! Big AL !

pocket rocket, but large!

http://donkey32.proboards.com/thread/989/burning-paint-off-minutes-tops?page=1#scrollTo=8921

http://www.rocketstoves.com/pdf/pocketrocket.pdf

http://www.youtube.com/results?search_query=pocket+rocket+heater

allen lumley wrote:Chilly : Two things -

One : you are creating one of the most efficient Wood burning units ''In the World " and then letting most of the heat radiate to the outdoors,
Simply Burying your exhaust pipe in a box of sand/Thermal Mass is preferable to allowing 60% of your heat to be exhausted to the environment !

Two : The barrel is vital to achieving even the 40% of prompt heating expected off of the RMH, No barrel and all you have is a way to burn wood
efficiently, and Zero Way to provide useful Warming !

When the barrel goes on the vertical chimney must go up, This is a mandatory step that is required by the Physics of the RMHs operation, You
can not even expect to test your RMH (out of doors ) without following up the setting in place of the barrel w/o immediately erecting your vertical
chimney !

Cast your net around you, hopefully you will find someone with previous experience in RMH building in time to make and test a few conventional
designs before your july event ! For the craft !

Think like fire, flow like a Gas, Don't be the Marshmallow ! As always your comments and questions are solicited and welcome ! Big AL !

Hi, thanks for the response. It would be good to make a thermal mass heater but I do not believe that is viable for this event. It will be out doors in a state forest, for one day. The heater needs to turn up and be removed the next day. I was looking at maximise the heat I can produce with little wood for a short time...mainly whilst a spit roast dinner is being eaten. Then removed.
However I am interested in making one for home. It will be an experiment at first and then maybe i'll look at putting one in the house or undercover seating area.

Chilly

Chilly ; Cast down your bucket where you are : Geof Lawton and other Australian pioneers of Permaculture have embraced the rocket stove, Many early RMH
pioneers arrived at their campsites with but little more than their Billycan and simple hands on experience !

You can also look for information on Fox holes and Rocket Stovesto see how a simple fire can be created with much greater efficiencies than three Rook
fires! The more you Google the more that you will learn !

A word to the wize, there is a lot of Crap - ''Flaming Units of Death'' masquerading as Rocket stoves and Rocket Mass Heaters on You-Tube, I would use a high
degree of suspicion of Anything I saw on you tube !
For the Cause Big AL !

Hi Allen,

There is a lot of stuff out there to read....and I am sure lots of it is junk too. Already seen a few things which just seem so wrong!!!

Hence being on here and asking....reading...learning and being grateful for the advice and pointers....thank you.

Have got three barrels to have a play with....just trying to find some pipe.

Looking for a one piece 150mm / 6inches diameter but thinking I might have to go with two pieces or three of 100mm/4 inches.....just because I can get that for free!!

Thanks again,

Chilly

Peter Chilvers : Here is where I recommend you goto rocketstoves.com to download your PDF Copy(s) of the Brand New 3rd edition of Ianto Evans now
Classic Book " Rocket Mass Heaters " !

With over 100,000 RMHs Made world wide, most were made following 'The Book', and 95% of all the 1st time builds (that Worked ) were made following 'The Book'!

A 6 inch system is about as small as you would want to attempt for a 1st time build, 4 inch systems are generally considered to be a job for someone who has
already built a few 6 inch RMHs first !

I am not sure I understand your last sentence. Just to clarify, When you Double the size of the pipe you are working with you get 4 Xs the Flow through the pipe,
you scrub off a lot of your flow due to friction loss at the inside surfaces of your pipes, This is called Laminar flow, and is the reason that you can not just scale
down a RMH. You quickly loose too much flow for the RMH to function Properly.

With a Tall vertical chimney,and no mass after the Barrel, you probably could make a 4'' system work, approximately 40% of your heat will be radiated off of the
Barrel, the other 60% will be vented directly to the sky

In fairness to any other members of the group(s) attending, you should post a clear disclaimer that due to time constraints and physics your system was built
w/out mass and may not function With Mass or indoors, after all we are trying to promote appropriate Technology, not set people up to fail ! For the Good of the Craft !
Big AL