Rocket Stove, Batch Rocket, Roquetinho


In the 1980's, when the Rocket Stove was invented, it was a cooker that was very easy and cheap to build, needing very little wood to get water cooking and producing hardly any smoke. It went all over the world, and from that time many people started to think about how they could use this simple but genius technique not only to cook, but also to heat spaces.

Much of this development was published on the Rocket Stove Forum where a lot of people delivered contributions. In 2012 Lasse Holmes from Alaska started an experiment - a rocketstove with a "horizontal feed". Peter van den Berg took that concept further, developing and optimizing. At the end of 2012 he was rewarded for his dedication: he had found the right dimensions, and even he himself was amazed about how good it worked. No valves, ventilators or whatever. Just bricks and natural principles in an optimized configuration resulted in the high efficient and super clean woodstove that was then called the "Batch box rocket".

By now, many Batch rocket applications have been build. Mainly as “mass heaters” - making it very heavy, so heat is stored in the bricks, giving it to the space slowly. You can find all about it on the Batchrocket website.

For Portugal’s climate, we thought, it would be better to have a “fast stove”: also made out of bricks, but only 6 cm thick, and with a steel top. Already within an hour it heats up the room (initially by convection). After an hour the bricks will radiate another 3 - 4 hours. Other than with a mass heater, at that point you can decide whether or not you light another batch of wood.

The stove

System size: 78 cm2 (4” / 10 cm diameter of the riser). Depending on insulation, the Roquetinho can heat a room up to 25 m2.


Dimensions:

   Bottom: 55 x 55 cm

    Height: 125 cm + plinth


Weight: about 500 kg


The riser is made out of Calde Cast MW Strong Lite insulating refractory concrete; the port is made out of Calderys F50 solid refractory concrete.

The top is an 8 mm thick steel plate. The door is made out of 4 mm steel, having a refractory glass window of 18 x 18 cm.


Fuel: any well dried wood, cut in logs of max. 30 cm length. One batch is ± 3 kg.


Testrun of the R123 prototype at Casal do Abade, Febr 13 2017

Prototype at Casal do Abade

It’s quite an impressive view - the extremely strong draft pulling the flames into the riser, together with the roaring sound! Temperature can go up to almost 1200º C.