Butane cannon build

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.
ToyFactory87
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Sat Jul 28, 2018 10:35 am

I made here a small cannon that is intended to use butane gas. My first trial ended up in failure. I am going to build a more reliable igniter that also seals the chamber. I am wondering though if my chamber is too small for gas?
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jrrdw
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Sun Jul 29, 2018 8:33 am

Your air / fuel mix is probably wrong. There is page after page of great discussion here on those topics.

Welcome to Spudfiles. :D
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jackssmirkingrevenge
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Sun Jul 29, 2018 9:41 am

How big is your chamber and how are you metering your gas?

For small volumes, a syringe is the best idea:

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hectmarr wrote:You have to make many weapons, because this field is long and short life
ToyFactory87
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Sun Jul 29, 2018 5:19 pm

Using a typical fill valve for butane lighter. I need to install an o ring in rear seal, and working in igniter module 3.5v dc to 40kv ac
ToyFactory87
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Sun Jul 29, 2018 5:24 pm

Just hitting the valve with the can. Wasnt metering. I havr to install an o ring to seal rear seal and im making ignitor plug that seals, and ignition power module 3.5v dc to 40kv ac
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jackssmirkingrevenge
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Mon Jul 30, 2018 7:51 am

In that case it's almost guaranteed that you have far too much fuel in your chamber. I really recommend the syringe method for accurate filling.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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