Introduction: Double Combustion Chamber Gun

This technique of "double combustion

chamber" increases twice (at least), the power of these weapons.

Actually shoot the gun 1X - 2X ?? ... no need to compress the air - fuel mixture previously.

In the first chamber "A", deflagration produces a pressure of about 3 -4 bar, as in any standard combustion weapon.

My idea was add a second combustion chamber "B", in which the products of combustion chamber "A", compress loaded in this chamber "B" mixture, thus achieving compression overcome atmospheric pressure, the resulting increase in pressure final shot. Not, is not a hybrid, but a common good power weapon combustion.

When gases accelerated by the transfer port is re-expand by increasing area in the chamber "B", there is a transfer of thermal energy, (due largely to the strong turbulence) from the chamber "A" . A chamber equivalent to the total volume of the two interconnected chambers, absolutely no energy increases to the trigger. I have tried this many times.

I relied to develop this method, in a study by Lars Rogstadkjernet entitled: "Combustion of Gas in Closed, Interconnected Vessels: Piling Pressure". Let down this excellent work in PDF, so that the interested reader can refer to.

In the case of this specific application, my gun, I touch the work of making various experiments, to give appropriate relationships with the necessary volumes of the chambers communicating hole diameter and effective method for mixing supply them both. If these relations, always for this application in particular, are not met, the power increase is not done, the gun behaving as if it had more than one camera ....

research on this topic is missing, but I think this is a first practical achievement, because without doubt my experimental gun pulls much stronger


1- Combustion chamber "A", 220 cm 3

2- Combustion chamber "B", 50 cm3

3- Manual air pump, 100 cm3 volumetric capacity, single action. It is activated 5 times, three to clean and two combustion chambers to inflate the exact amount of mixing.

4- sliding system for introducing ammunition (steel ball 3/16 "- 4,76mm).

5- liquid fuel tank (ethyl alcohol 95%) of 18 cm3

6- fuel line.

7- hose to avoid splashing.

8- gun barrel.


- The orifice intercommunication between the two chambers has a diameter of 5mm. The final output port, which overlooks the canyon is 4mm in diameter. This area ratio is the only one that seems to work well.

Actually it is unknown as the stoichiometric air mixture is compressed - fuel in chamber "B" because I do not have the necessary measurement tools, however, with an estimate "by eye and ear", and comparing penetration munitions at different targets, with and without the combustion chamber "B", I think about the mixture is compressed to about 1X - 2X, at least.

- This gun has also, a neodymium magnet retaining the ammunition strongly increasing retention combustion gases and adding more power to the shots.

It is necessary to reinforce both chambers with fiberglass and epoxy resin, especially the "B", as I have happened to be deformed and this matter of reinforcing with fiber, would avoid this problem and greatly reduce the risk of explosion.

I am not liable for personal injury caused by the use or misuse of this weapon.

This video shows the operation of this weapon combustion. Regards !

“Combustion of Gas in Closed, Interconnected Vessels: Pressure Piling”

By Lars Rogstadkjernet

Step 1: Double Combustion Chamber Gun

Step 2: Double Combustion Chamber Gun


About This Instructable




Bio: Me gusta planear y realizar proyectos de ciencia y arte.
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