Holey Roket

Joshua B. Guinto in the Phillippines used the Oblak Holey Roket stove as inspiration and created a stove with an extra compartment to store char until cooking is done and the char is sufficiently cooled. He has done a wonderful job of writing up the results in the attached pdf.
From his conclusion:
The Charmaking Stove is Born!

  • The Char Making Holey Roket Stove is born!!
  • It allows harvesting bio char safely and conveniently and without having to tip the stove over. It eliminates the risk of heat fatigue, burns and open fires.
  • It allows clean cooking with the similar performance as a gasifier stove.
  • It allows continuous cooking.
  • The stove will last for four years or more.
  • It can be used with many other kinds of fuels.
  • The stove is much cheaper and can be fabricated in village workshops thus promotes social inclusion much better.
  • With clay, the stove has very small ecological footprint.
Reinforced Holey Roket Stove
Holey Roket Stove - Drawing (side)
Holey Roket Stove top view

by Joshua B. Guinto
Specialist, Sustainable Village Technologies

1 The Basic Mechanisms of the Rocket Stove. With the lessons from people like Rok Oblak, Richard Stanley and the Aprovecho Institute the author began learning to build the holey roket stove in his workshop at Daet, Camarines Norte. With sheer perseverance and amidst scarcity, he was able to create several models and delivered skills training to poor people in Camarines Norte, Sorsogon and recently in Bulacan.

2. Among the many feedbacks from the users are the limitation of the holey roket stove in terms of (1) fragility in handling and (2) capacity to receive bigger loads when cooking for bigger occasions and events and for food business. In response, one of the models was picked up for reinforcements.

3. The Innovations as of July 2013

The Swan Stove is a Double Burner
The Swan Stove Can also Cook and Grill
Mr Booh Roket Stove

More pictures of Jed's work on Stoves and also a pdf of Jed's work on stoves and ovens

Also take a look at http://www.stoves.bioenergylists.org/Holey-Roket-2013
for other pictures of this type of stove.

Jed started with the Rok Oblak Holey Roket stove:
http://stoves.bioenergylists.org/taxonomy/term/243

and has been making improvements to the design detailed in the pdf, and has these lovely stoves made with the help of the artists he's been working with in the Philippines.

These are the features that he's working to include in the latest batch of stoves:

  • A side fed fuel chamber allows for continuous cooking.
  • Better flame control.
  • Eliminating the risk of handling hot char.
  • Allowing for multiple fuel types
  • Clay is less expensive than metal.
  • Clay stimulates employment, social inclusion, and creativity
  • Clay stoves are heavier and brittle but they outlast equivalent metal stoves, some lasting for longer than 3 years of continuous use.
File attachments: 
Holey Roket Stove Double-Barell as a Fish
Holey Roket Stove as a Truck
Prototype Holey Roket on a box blatform with a Char pocket

See even more pictures at http://www.stoves.bioenergylists.org/Phillipines-Holey-Roket

The first two stoves in the attached i already am making since the past years. And recently, i have been teaching women and soon their husbands to also make their rocket stoves here in the province of Bulacan under a disaster preparedness program by the Save the Children International. They also make their own designs of flowers, castle towers, chess characters, and faces into their stoves.

the drawing in the third attachment is a prototype in process. It is a Holey Rocket Stove with a char pocket on the side and a box as a platform. I hope to finish it in the coming weeks.

Joshua Guinto
jed.building.bridges@gmail.com

From Rok Oblak, How to Make the Holey Roket Stove

YouTube Video showing cooking with the Holey Roket Stove

Making the Holey Roket Stove (youtube Video)

Instructions and some beautiful examples of the Roket stove can be found on Rok Oblak's Web site: http://holeyroket.wordpress.com/

Holey Roket: A Biomass Briquette Stove
Rok Oblak, Slovenia, June 2009

See Rok Stoves
and Fuel Briquette Burning at Stoves Camp 2008

The Holey Roket technology promotes using biomass briquettes and their hole as the key feature of an efficient cooking system. The flames coming in the combustion chamber are condensed within a small space (scheme) providing higher heat output and therefore better combustion of toxic gasses like Carbon Monoxide (CO).

Fuel Briquette Burning at Stoves Camp 2008
Rok Oblak, August 31, 2008
Briquette Burning StoveBriquette Burning Stove


Stove DiagramStove Diagram

This prototype was to check the hole of the briquette and how gasification can do a nice job. As said, starting the fire with few small sticks and then after preheating the chamber, briquettes ignite by themselves and burn throughly. You can help flames with having a stick in the hole while burning. I really liked how the briquette retained its shape after it burned out, so you could still push the next one it without preventing the draft..

But the briquette burned with the surface lit from the combustion chamber, as Larry predicted. You could literally walk away of the stove with the consistent flame going on all the time (I guess the briquettes were good quality :) The air inflow was only through the hole of the briquette.

Funny was, that even when one briquette burned out, the next one ignited and the airflow continued through the hole of the first briquette.

Mdula: A DIY Mud Cooking Stove
Rok Oblak, August 2008

MdulaMdula

Mdula or Modular Mbaula (stove) is a design project aiming to simplify the construction of an efficient household mud cooking stove for extreme rural areas. It is based on a Do-It-Yourself (DIY) construction techique using a simple wooden mold.

Rok Oblak has started a blog on the development of the Mdula at:
http://mdulastove.wordpress.com/

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