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Available Now, Detailed Basic Batchbox Construction by Dragon Technology

thomas rubino

master rocket scientist

Posts: 6807

Location: latitude 47 N.W. montana zone 6A

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posted 1 year ago

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My new book for first-time builders has arrived from the printers and is available to purchase now.
https://dragontechrmh.com/now-available-batchbox-core-construction-book/
Understanding Batchbox construction supplies you with all the information needed to build a Batchbox core.
Material and tools needed, detailed measurements for a 6" batch with the numbers to increase to any Batchbox size.
Suggestions on where to purchase materials in your area.
I asked Peter van den Berg to proofread this book for accuracy before printing and have received his approval.

This book only details Batchbox Core construction, it does not direct you on how to build the bell or bench that your core will be heating.
Bell or bench construction is a site-specific detail that must be decided on site when laying out your stove build.

See my site for prices.
Save and order both my books together.
To order with PayPal contact me at dragontech@blackfoot.net
To order with a check
https://dragontechrmh.com/now-available-batchbox-core-construction-book/

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For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!

Glenn Littman

rocket scientist

Posts: 178

Location: Sangre de Cristo Mountains, CO - Lat 38°14' - Zone 5b

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posted 1 year ago

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Bravo Tom! The DragonTech technical resource library is growing. I understand these fine textbooks will be required reading for anyone looking to get their Rocket Scientist PhD (Phire Doctore).

Rocket surgeon and soil builder... healthy plants are all about the soil.
- My 6" Batch Rocket specs and materials list: https://permies.com/t/248275/Batch-Rocket-Double-Skin-Bell
- Batch Rocket detailed build thread with Q&A: https://permies.com/t/238503/Batch-Rocket-Build

Rob Dooley

Posts: 33

Location: Pacific NW - Oregon

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posted 10 months ago

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Whoo-Hoo!
my books are on the way - Thanks Tom!
Glenn, I will be going over your builds a lot as I get into this. I am way ready to have less wood cutting to do.
I didn't realize there was a PhD involved - I guess I better study some more...

Glenn Littman

rocket scientist

Posts: 178

Location: Sangre de Cristo Mountains, CO - Lat 38°14' - Zone 5b

136

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posted 10 months ago

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Rob Dooley wrote:Whoo-Hoo!
my books are on the way - Thanks Tom!
Glenn, I will be going over your builds a lot as I get into this. I am way ready to have less wood cutting to do.
I didn't realize there was a PhD involved - I guess I better study some more...

Rob, this is a great community here, ready to answer questions, provide some real world experience and generally cheer you on as you undertake this most rewarding project.

Eloise Rock

pollinator

Posts: 102

Location: South Central Alaska Zone 4a/b

posted 9 months ago

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Wondering if the book includes how to properly size the core for the size of the stove? Or the stove for the size of the core, however you go about it. And any other factors relating to the core integrating into the whole project? Thanks!

thomas rubino

master rocket scientist

Posts: 6807

Location: latitude 47 N.W. montana zone 6A

3713

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posted 9 months ago

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Hi Eloise;
My book is on core construction but does touch on integrating it into a bell.
Bell size is determined by the internal surface area (ISA)
Each core size can utilize a certain bell size without adding a bypass.
Here are the published ISA numbers for specific core sizes.
From Peter's website https://batchrocket.eu/en/building
Riser diameter / Internal Surface area

12.5 cm (5") ISA 3.7 m² (39.8 sq ft)
15.0 cm (6") ISA 5.3 m² (57 sq ft)
17.5 cm (7") ISA 7.2 m² (77.5 sq ft)
20.0 cm (8") ISA 9.4 m² (101 sq ft)
22.5 cm (9") ISA 11.4 m² (123 sq ft)
25.0 cm (10") ISA 14.7 m² (158 sq ft)

These isa numbers can be exceeded by installing a bypass to aid in starting a good draft.

EDIT) ISA is measured on the walls and the roof unless it is insulated.
The floor and the core are not measured.

For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!

Anthony Dougherty

Posts: 58

Location: All Heavenly Hosts Homestead - Maine, zone 5

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posted 9 months ago

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are those metal doors necessary? if i didn't want a bell and instead wanted the load opening to be open, would this be a problem for the dynamics of the operation?

“Increase and multiply, and fill the earth, and gain dominion over it, and rule over the fish of the sea and the birds of the heavens and all the livestock and all the earth and all the creeping things that creep upon the earth.”

thomas rubino

master rocket scientist

Posts: 6807

Location: latitude 47 N.W. montana zone 6A

3713

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posted 9 months ago

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Hi Anthony;
No, doors are optional.
The original Batcboxes had no door and sometimes a large slab was propped there to keep sparks inside and hold some heat after the fire goes out.
Efficiency may suffer and over-fueling is likely to happen when adding wood.

A plug door of CFB can be used as a temporary door.

So no bell?
Just an open Batchbox?
With the riser venting outdoors?

For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!

Anthony Dougherty

Posts: 58

Location: All Heavenly Hosts Homestead - Maine, zone 5

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posted 9 months ago

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thomas rubino wrote:Hi Anthony;
No, doors are optional.
The original Batcboxes had no door and sometimes a large slab was propped there to keep sparks inside and hold some heat after the fire goes out.
Efficiency may suffer and over-fueling is likely to happen when adding wood.

A plug door of CFB can be used as a temporary door.

So no bell?
Just an open Batchbox?
With the riser venting outdoors?

yeah i originally was interested in RMHs, but i was hoping a Batchbox set up might feel a little more fireplace(y) and be a nice touch for these Maine winter nights. My though was embedded in a central Cob wall that would capture and radiate the heat through the house.

I agree. Here's the link: http://stoves2.com