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mini pill bottle combustion

Discuss miniature cannons built from things such as pill bottles and pen caps.
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mini pill bottle combustion

Unread postAuthor: skishoot » Thu Jun 17, 2010 4:15 pm

Hello this is my first mini (i have built 2 nerf guns) and I would really like feedback on it. I am hopefully going to make another version but I want my next version to be the best it can be. I used a small pill bottle for the chamber and a barrel that fits airsoft bbs extremely loosely.I took the igniter from a lighter and use ax in it. I was wondering if just having bare wires in the chamber for ignition is not the best, should I replace it with nails or screws? also does anyone know if there is a way that I can get a clip and possibly use it for airsoft battles if i had a hop up? I will probably get a tank and compress it with air so I just have to press a blowgun handle to prime it then pull the trigger. Here are some pics:

EDIT: any suggestions please share!!!!
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updated with airsoft pistol barrel
Last edited by skishoot on Fri Jun 18, 2010 2:29 pm, edited 1 time in total.

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Unread postAuthor: metalmeltr » Thu Jun 17, 2010 6:41 pm

I would recomend using a piece of 3/4 pvc or copper to hold the compressed air and use 5/16 metal fuel line as the barrel a blowgun will work for the valve
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Unread postAuthor: skishoot » Thu Jun 17, 2010 6:59 pm

what is 5/16 barrel good for?
thanks
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Unread postAuthor: Gun Freak » Thu Jun 17, 2010 7:14 pm

5/16 line is a good fit for airsoft bb's.
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Unread postAuthor: skishoot » Thu Jun 17, 2010 7:23 pm

ok thanks and by the way does having screws for the ignition create a bigger spark? and where can I buy the 5/16 fuel line?
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Unread postAuthor: Gun Freak » Thu Jun 17, 2010 7:33 pm

No I don't think using screws makes a difference but it just makes the spark stay in one place because the screws are stronger than a plain wire.
You can get the line, I think it's brake line... at auto stores.
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Unread postAuthor: skishoot » Thu Jun 17, 2010 7:42 pm

thanks, do you have any idea how much it will cost?
sorry i'm asking so many questions, I'm a newb.
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Unread postAuthor: Gun Freak » Thu Jun 17, 2010 7:46 pm

No problem, it should only be a few bucks for a few feet, far too long for this gun but you can use it for multiple guns.
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Unread postAuthor: skishoot » Thu Jun 17, 2010 7:50 pm

ok thanks alot I'm planning on building a vortex cap soon too so that will work out.
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Unread postAuthor: Gun Freak » Thu Jun 17, 2010 8:02 pm

Cool, BBMG's are cool too and not that hard to make, just do a lot of research in the Wiki and in the showcase.
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Unread postAuthor: skishoot » Fri Jun 18, 2010 1:38 pm

I found brass 6.1mm ID at Mcmaster will that wok as barrel material?
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Unread postAuthor: deathbyDWV » Fri Jun 18, 2010 2:20 pm

That'll work fine. Good job on the mini... :)
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Unread postAuthor: skishoot » Fri Jun 18, 2010 2:26 pm

thanks, I replaced the barrel with an airsoft pistol barrel that is attached to it's hop up. I will add a pic at the top.
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Unread postAuthor: skishoot » Sun Jun 20, 2010 2:37 pm

will 1/4 in copper pipe work as a barrel? sorry i heard somewhere it would but I am not sure. please help and suggest improvements on the cannon.
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Unread postAuthor: theBOOM » Sun Jun 20, 2010 4:57 pm

Metered fueling (syringe would be easiest), chamber fan if possible, longer barrel.
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