The Inbox

How to make your own Contod Rocket Stove for disasters

By Hazel  P. Villa,VERA Files

After VERA Files featured on Yahoo! a story on a stove innovation that can be built in less than two hours with minimal skills, tools and materials from typhoon debris, requests were made to post the actual steps.

Development worker Joshua "Jed" B. Guinto, who made the innovation from the basic design of the rocket stove by Dr. Larry Winiarski of the Aprovecho Institute in Oregon, has adjusted the materials to include old metal roof with clay, soil and rice husk as the insulating layer.

Called the Contod Rocket Stove, Guinto says the stove can be made out of tin metal sheets such as old metal roof (yero), 30 liters carbide canisters or even biscuit container of equivalent size plus three pieces of one-liter tin cans (Del Monte pineapple cans are of the right size). It will also require clay or soil and other biomass materials such as rice husks and coco fiber (bunot ng niyog) for the insulating layer.

The efficiency of the rocket stove comes from the right combination of fuel, air and heat. It is important that the wood sticks fuel are small and air is flowing freely beneath them. It is only partly pushed to the burner chamber so as not to create too much smoke. The long fuel shelf preheats the incoming fuel and air. The high chimney serves as to pull up fresh air and at the same time burn the smoke without losing heat because of the insulating effect of the clay-rice hull mix. The extra high skirt protects the heat from being blown off and improves the contact of the flames to the pot. The hot skirt serves to dry the next fuel stick.

The steps to making the Contod Rocket Stove, as shared by Guinto, are shown below:

Steps 1 and 2. Join two containers of Del Monte Pineapple juice cans or any similar container in a T-junction. One hole would serve as the fuel chamber and the other end as the chimney.


Step 3. Cut a metal roof to the size which will allow the kettle to cover the sides of the pot. Flatten the metal by pounding with a big piece of wood. Make a hole on the side to fit in the fuel chamber.


Step 4. Join the ends of the metal roof. Fold one inch at both ends in opposite directions and lock them together by carefully hammering. Lock the joint together by punching a hole at both ends and fix with a piece of wire.


Step 5. Assemble the T joint inside the center of the cylinder. Put on more one liter tin can on top of the chimney.


Step 6. Prepare a mixture of one part soil or better yet, clay to one part rice hull and one part coco fiber.


Step 7. Fill the space between the T joint and the cylinder and press the mixture hard.


Step 8. Put three pieces of stones with the size enough to have the pot about 1.2 centimeters from the chimney.


Step 9. Cut and flatten one more piece of metal sheet. This which will serve as the platform of the fuel sticks inside the fuel chamber without blocking the fire chamber.


Step 10. Prepare about ten small tin cans of sardines. Cut open both sides and attach them to the uppermost side of the stove. This will serve as holder of the wet fuel sticks which can be dried while cooking.


(VERA Files is put out by veteran journalists taking a deeper look at current issues. Vera is Latin for "true.")


Editor’s note:Yahoo Philippines encourages responsible comments that add dimension to the discussion. No bashing or hate speech, please. You can express your opinion without slamming others or making derogatory remarks.

  • Couple married 67 years holds hands in final hours together
    Couple married 67 years holds hands in final hours together

    FRESNO, Calif. (AP) — After spending 67 years together as devoted husband and wife, there was no question how Floyd and Violet Hartwig would end their lives — together. …

  • Lupita Nyong'o's $150,000 Oscars dress stolen from hotel
    Lupita Nyong'o's $150,000 Oscars dress stolen from hotel

    The $150,000 pearl-studded, custom-made Calvin Klein dress worn by Oscar-winning actress Lupita Nyong'o at this year's Academy Awards has been stolen, police said on Thursday. The gown, embellished with 6,000 natural white pearls, was stolen from Nyong'o's room at the London Hotel in West Hollywood, during the day on Wednesday, a spokesman for the Los Angeles County Sheriff's Department in West Hollywood said. "Ms Nyong'o was not in the room at the time of the theft," Deputy John Mitchell …

  • US-led strikes on IS after group seizes 220 Christians
    US-led strikes on IS after group seizes 220 Christians

    The US-led coalition has carried out air strikes against the Islamic State group in northeastern Syria, where the jihadists have launched a new offensive and kidnapped 220 Assyrian Christians. The raids on Thursday struck areas around the town of Tal Tamr in Hasakeh province, the Syrian Observatory for Human Rights said, without giving information on possible casualties. The town remains under the control of Kurdish forces, but at least 10 surrounding villages have been seized by IS, along …

  • Militants abduct more Christians, smash ancient artifacts
    Militants abduct more Christians, smash ancient artifacts

    BEIRUT (AP) — Islamic State militants seized more Christians from their homes in northeastern Syria in the past three days, bringing the total number abducted by the extremist group to over 220, activists said Thursday. …

  • 3 Pinays on Forbes power women list
    3 Pinays on Forbes power women list

    Three Filipina executives, who are all daughters of known business tycoons in the country, made it to Forbes’ list of the 50 most powerful businesswomen in Asia. Teresita Sy-Coson, vice chairman of SM Investments and chairman of BDO Universal Bank, was included in the list for the fourth year in a row since its inception. “Under her (Sy-Coson) lead SMIC became the largest listed company on the Philippine Stock Exchange by market cap. Also in the 2015 list is 70-year-old Helen Yuchengco-Dee, …

  • 13 of 15 SAF survivors to leave PNP hospital
    13 of 15 SAF survivors to leave PNP hospital

    Thirteen of the 15 Special Action Force (SAF) policemen who survived the bloody firefight with Muslim rebels in Mamasapano last month are ready to go home after a month of medical treatment, a police official said yesterday. Philippine National Police (PNP) spokesman Chief Superintendent Generoso Cerbo Jr. said the two remaining survivors will have to stay in hospital for further treatment, one of whom has shrapnel embedded near his spine. One of the two SAF commando survivors is still …

  • US sends spy plane to patrol disputed sea
    US sends spy plane to patrol disputed sea

    The United States has deployed its newest and most advanced surveillance aircraft for patrols over the West Philippine Sea and South China Sea. The P-8A Poseidon aircraft completed more than 180 flight hours from Feb. 1 to 21 from Clark Air Base, according to the US Navy’s 7th Fleet. …

  • Review: SKK Mobile V2, a P3,999 watered-down LG G2
    Review: SKK Mobile V2, a P3,999 watered-down LG G2

    How well does this P3,999 offering from an underdog in the local mobile industry stack up against the competition? Let's find out. …


Should Aquino be held accountable over the Mamasapano operations?

Poll Choice Options