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2 Liter bottle Cannon

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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2 Liter bottle Cannon

Unread postAuthor: cannons-go-boom » Sat Nov 03, 2007 4:30 pm

My question is, How many psi can a 2liter bottle hold?



I have a bike Tire valve on a 2liter bottle, then the 2liter has a barrel on it.


Air Cannon Diagram:

--{000}**oooooooooo

-- = Tire Valve.

{000} = Chamber

** = Hose Valve thingy.

oooooooooo = Barrel
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Unread postAuthor: Novacastrian » Sat Nov 03, 2007 4:34 pm

I would feel safe at 100 psi, most bottles can hold more than this however there is a chance that it might be a *dud* bottle.
Please be careful with your "chamber" :) i.e. no blowing thyself up.
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Unread postAuthor: MrCrowley » Sat Nov 03, 2007 4:36 pm

[sarcasm]
Where F = final PSI in bottle before it goes boom
And T = Max PSI bottle can hold

F-1 = T

[/sarcasm]

Soda bottles are only meant to hold enough PSI safely for the CO2 in them, which is just a few psi, they have no pressure rating that we know of, but people have used them up to 80psi before.
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Last edited by MrCrowley on Sat Nov 03, 2007 4:41 pm, edited 2 times in total.
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Unread postAuthor: cannons-go-boom » Sat Nov 03, 2007 4:36 pm

lol, yeah.

I watched mythbusters and they said a certain psi but I forgot what it was.


Also, it is a 1 inch barrel. Any ideas for ammo?



P.S.
To everyone who doesnt remember me.
Its not my first cannon.
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Last edited by cannons-go-boom on Sat Nov 03, 2007 5:56 pm, edited 1 time in total.

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Unread postAuthor: Ragnarok » Sat Nov 03, 2007 4:52 pm

I've taken them past 100 without them exploding. These days, I then normally shoot something through them and watch them explode anyway.
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Unread postAuthor: ALIHISGREAT » Sat Nov 03, 2007 4:53 pm

cannons-go-boom wrote:lol, yeah.

I watched mythbusters and they said a certain pis but I forgot what it was.


Also, it is a 1 inch barrel. Any ideas for ammo?



P.S.
To everyone who doesnt remember me.
Its not my first cannon.


for ammon ideas check the sticky thread int he construction materials/ammo discusion section. and its psi not 'pis'
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Unread postAuthor: blackosprey » Sat Nov 03, 2007 4:54 pm

Why are you using soda bottles again?
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Unread postAuthor: cannons-go-boom » Sat Nov 03, 2007 4:54 pm

Ragnarok wrote:I've taken them past 100 without them exploding. These days, I then normally shoot something through them and watch them explode anyway.


lol, nice.
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Unread postAuthor: Infernal Maveric » Sat Nov 03, 2007 4:54 pm

I have seen test videos of people taking 2L soda bottles to 150PSI, but the chamber was all deformed, so it didn't look like a smart/safe thing to do.

If I were you, then I would invest a little more than $1 on a cannon to ensure you won't go deaf when (not if) the chamber decides to pop.
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Unread postAuthor: blackosprey » Sat Nov 03, 2007 4:55 pm

Yah know... it would be fun to have a "who can make the cheapest yet still safe cannon" contest. Unless it's already been done.
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Unread postAuthor: sandman » Sat Nov 03, 2007 5:10 pm

cannons-go-boom wrote:I watched mythbusters and they said a certain pis but I forgot what it was.


theirs bursted at 150 psi
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Unread postAuthor: cannons-go-boom » Sat Nov 03, 2007 5:23 pm

I can go 50 safe right?
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Unread postAuthor: Novacastrian » Sat Nov 03, 2007 5:35 pm

cannons-go-boom wrote:I can go 50 safe right?


Yeah, i cannot foresee any probs at 50psi.
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Unread postAuthor: MrCrowley » Sat Nov 03, 2007 5:38 pm

Most likely, but if the bottle has a defect you could be screwed.

Some kid in NZ had a coke bottle explode on him at normal pressures (meaning he just bought the drink and it went boom) and he was showered with plastic bits and had to go to ER to get them removed.
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Unread postAuthor: Novacastrian » Sat Nov 03, 2007 5:50 pm

MrCrowley wrote:Most likely, but if the bottle has a defect you could be screwed.

Some kid in NZ had a coke bottle explode on him at normal pressures (meaning he just bought the drink and it went boom) and he was showered with plastic bits and had to go to ER to get them removed.


Sounds like someone at the Coke factory needs a stern talking to.
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