Warning! working with electricity and gas is dangerous. I accept no responsibility for others actions using the information on this site.
Introduction
This spudgun is made for fireshows so it has a rather short barrel and it normally doesn’t shoot projectiles. I have been experimenting a lot with different ways to make a larger fireball.
Specifications
| Tube | Ø110mm PP pipe, length 120cm |
| Combustion chamber | Ø110x300mm |
| Spark | Stungun with 9v battery |
| Gas | 1x 600ml propane bottle |
| Ventilator | 12v air mattress inflator |
| Ventilator power | 12v battery from power drill |
Diagram
Spudgun diagram
Description
This spudgun is made inside a 110mm PP pipe. It is designed to be fired in rapid succession therefore the gas tank is located inside the pipe. Valves can be ativated to allow gas to flow into the combustion chamber. A stungun provides the spark to ignite the gas. After firing a small blower vents the combustion chamber for the next firing.
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- spudgun total view
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- spark gap wires
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- gas canister and valves
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- gas canister and valves
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- on/off switch for the trigger. inlet for the blower
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- 12V battery for blower and stungun
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- Showing the trigger and the stungun
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- three different sizes of balloon pipes. 75, 110 and 160mm
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- Pipe for gas balloons
Operation
A firing round begins by letting some gas into the combustion chamber for about 5 seconds. The gas is shut off and another valve closes the gas inlet pipe. The Stungun can now be activated and the gas mixture ignited. After firing the valve for the blower is opened and the combustion chamber is vented. The blower valve is closed and the gas inlet pipe is opened. Now the process can start over.
Video of the spudgun shooting wads of savdust dipped in petrol and wrapped in a paper towel.
Video of the spudgun firing gas filled balloons