Combustion Cannon with stand

Boom! The classic potato gun harnesses the combustion of flammable vapor. Show us your combustion spud gun and discuss fuels, ratios, safety, ignition systems, tools, and more.
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Sun Jul 07, 2019 7:11 am

Hi everyone. I want show you my Potato gun, what I made. For me it is little ugly. I need to clean it but it works and it is fueled via 100 ml syringe :D btw sorry for my bad english. I fuel the gun from syringe using 100 ml of propane-butane and cannon never almost failed. Is it good ratio of fuel? In my calculation I need 115 ml but i am not sure about that.
- chamber volume: 3.5 l
- barrel diameter: 5cm
- barrel length: 1 meter
- range: about 80-90 m
- Piezo BBQ ignitor
- fuel: Propane-butane for lighters
- ammo: Potatoes, has someone knows good ammo for 5cm diameter barrel?
- removable barrels
120 mm Fan (runs on two 9V batteries)
Wooden stand (95 cm high)
Funny story: I shot twice times with it and the fan started to move so I used super glue and baking soda method to repair it and by accident i hit one propeller with glue and now it is stuck. For now I don't know how to remove this glue.
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Sun Jul 07, 2019 11:16 pm


Nice example of a "traditional" combustion :) and good on you for using syringe fueling!

I would say the ideal quantity to inject if you 3.5L chamber volume is accurate would be 130mL, so you might be injecting a little under if it's a 50:50 propane:butane mix.
hectmarr wrote:You have to make many weapons, because this field is long and short life
Private 4
Private 4
Posts: 70
Joined: Thu Mar 07, 2019 12:38 pm

Mon Jul 08, 2019 4:06 am

Thanks. I don't see on bottle any words about mix.
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