Jet or rocket furnace – features, pros and cons

Let’s clarify right away that the stove will emit a strong sound only in case of violation of the operating rules – the roar of the engine is obtained when excess air enters the furnace. The rocket furnace will normally make a quiet rustle. It runs on wood and other fuels and is highly efficient..

The rocket stove came to us from the USA and is still little known even to professional stove-makers, although it definitely deserves attention.

How the rocket furnace works:

• Direct burning. Fuel gases flow freely through the channels of the furnace without being stimulated by the draft, which is created by the chimney.
• Flue gases, which are always emitted when burning wood, are burned out. This is called pyrolysis.

The simplest jet furnace will consist of two tubes, one of which runs horizontally and the other upward. You can also use one bent pipe if you have the opportunity, otherwise welding works.

The fuel in the rocket furnace is put directly into the pipe. In this case, the incandescent gases will tend to go up, along the vertical section. On the cut of the pipe, you can place a container that will be used for cooking or boiling water. It is imperative that a gap remains between the tank and the pipe so that the combustion products can freely go out..

What else you need to know about the jet furnace:

• It is both a cooking and heating.
• It is quite possible to equip the “rocket” with a stove bench, approximately as in a Russian stove, but this design will be much less cumbersome.
• The operating time on one fuel fill in the rocket furnace is about six hours, and it keeps heat up to 12 hours if the metal structure is finished with adobe plaster.
• Initially, the rocket furnace was intended for use in nature, in the field. Portable metal structures still occupy the first place in popularity, but stationary furnaces have appeared, working on the same principle, made of brick or clay..

Pros of the rocket furnace:

• The simplicity of the design itself, which can be done independently, materials are available.
• Ability to use a variety of fuels. In such a furnace, even low-quality fuel, raw thin branches and so on will burn.
• Energy independence.
• High efficiency of work, less fuel consumption.

Cons of a jet oven:

• It will have to be controlled manually. It is necessary to constantly monitor the combustion process and regulate it.
• Some elements of the rocket furnace can get very hot, especially for the simplest metal structures. That is, there is a great danger of burns when touched, you should be especially careful not to let children near the rocket furnace.
• It will not work to use an oven of this design in a bath, since it simply cannot quickly heat the room to the desired temperature.

Now you can find the simplest schemes for how to fold a rocket furnace of 20 bricks with your own hands without mortar in just three minutes anywhere. The first row will be solid, with a horizontal projection, the second – with a hole above the projection for storing fuel, the other three rows will be a pipe. It will be warm, you can just put a cauldron or a saucepan on top.

However, in more sophisticated and efficient versions, the flue gases are passed under the bed, for example, through special channels. The second option is to install a water circuit on a simple rocket furnace..

These are examples of the biodesign of stoves operating on the “rocket” principle, but much more complex and modernized ones, with stove benches. The construction of such clay furnaces is carried out by the German company Lehm und Feuer..

Let us state that the rocket oven has many advantages, including ease of installation, the ability to use it in the field or in the summer in the yard for cooking various dishes on live fire. You just need to understand the principles of operation and design features.