second combustion gun

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.
nibbler125
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Sun Jan 26, 2014 1:09 am

Ok so I took a break from spud gunning but now I decided to come back and what better of a way then with an over under design. The gun is made with sch 40pvc and I also used some wood for reinforcement to stop flexing and provide for handles.

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Specs...Barrel is 2" bore and is 5' long. Combustion chamber is 3" bore and is 2' long.

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I made the box out of hobby grade plywood, It houses a rechargeable battery and the switch used to power the chamber fan, Note the light only comes on when the fan is running

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This being the inside of the gun, it uses dual spark, one on each end of the combustion chamber and a fan between them. The whole unit is removable with one screw to be serviced and the wires entering the chamber are a tight fit and have been glued in place to prevent leaks

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The ignition here is a simple piezo ignitor with a nice handlebar grip to cover the copper tube its housed in

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Front handle, not much to say, It balances quite nicely and can be carried around one handed


My final notes, This has turned out to be a very nice gun it seems to shoot with quite a bit of power and is still compact, clean and is made well. I really like the over under style too, it handles very nicely and is easier to aim then I originally thought.
Last edited by nibbler125 on Thu Oct 09, 2014 3:00 pm, edited 1 time in total.
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mark.f
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Sun Jan 26, 2014 6:33 am

Looks great! Nice simple combustion gun. Do you use propane/butane or is this a spray n' pray?
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Labtecpower
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Sun Jan 26, 2014 6:57 am

I've spotted some DWV parts :P

Other than that, nice gun! :)
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jackssmirkingrevenge
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Sun Jan 26, 2014 7:54 am

Shineh! props for the toggle switch :D
hectmarr wrote:You have to make many weapons, because this field is long and short life
nibbler125
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Sun Jan 26, 2014 11:07 am

mark.f wrote:Looks great! Nice simple combustion gun. Do you use propane/butane or is this a spray n' pray?
Its spray and pray at the moment but there is lots of room to put a propane injection system in.
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