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quick question

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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quick question

Unread postAuthor: poopsiedoodle1234567 » Tue Jun 26, 2007 6:14 pm

im making my first spud gun and i was wondering what a safe amount of psi is for a plastic pepsi bottle so it wont explode on me.

thanks in advance.
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Unread postAuthor: pat123 » Tue Jun 26, 2007 6:21 pm

i have heard people say that they hold 150 psi before they explode but I wouldn't go over 50 or 60

welcome to spudfiles
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Unread postAuthor: lukemc » Tue Jun 26, 2007 6:22 pm

well they are meant for water pressure but ive had mine up to about 75 psi and no problems. im sure people will say that they can got to 125 but im not going to it seves its purpose at 75
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Unread postAuthor: jssizzle » Tue Jun 26, 2007 6:23 pm

Well, they have been tested up to 160 psi, but NEVER try to take them up that far. It really varies by brand, so to be safe don't take it over 75.

Plenty of people will say otherwise, but for your own sake stay under 75.
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Unread postAuthor: poopsiedoodle1234567 » Tue Jun 26, 2007 6:26 pm

thanks :) :D
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Unread postAuthor: paaiyan » Tue Jun 26, 2007 6:31 pm

Best advice, don't use a bottle. Haha, but you should be good to about 75 I think.
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Unread postAuthor: praetorian91 » Tue Jun 26, 2007 6:50 pm

Personally, I would stay away from bottles. PVC is cheap, and solvent welding is not that hard. Besides, you are going to have to work your ass off to attach the threads on the bottle to a valve and barrel.
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Unread postAuthor: trae08 » Tue Jun 26, 2007 6:52 pm

well i dont think if a bottle blows up it would hurt you just scare you depending on what you were doing.. anyway ive had them bottles up to 125 with no problems
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Unread postAuthor: paaiyan » Tue Jun 26, 2007 6:54 pm

WEll the bottle wouldn't hurt too much, unless you had it between your legs... WHo was it that tried that stunt? I forget. Anyway, don't do it.
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Unread postAuthor: spudbud101 » Tue Jun 26, 2007 6:57 pm

A bottle ruptured between a guy's legs... Dear god.
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Unread postAuthor: paaiyan » Tue Jun 26, 2007 6:58 pm

I think it just laft a gash in his inner thigh, he got off lucky. But whoever wants to try it again, watch out for two things; femoral artery, and the family jewels.
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Unread postAuthor: sandman » Tue Jun 26, 2007 7:30 pm

i have had my old compressed air bottle launcher at 90 psi and i had no worries
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Unread postAuthor: mark0491 » Tue Jun 26, 2007 8:25 pm

Back when i was building "bottle Rockets" for my nephews i got them to get about 100 psi saftley But i wouldn't suggest going over around 75-80
Also Try and find thicker bottles they produce higher Psi
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Unread postAuthor: knappengineering » Tue Jun 26, 2007 8:33 pm

I had a small soda bottle explode on me at 40 psi but I've launched two liter bottle rockets at over 60 psi. I'm using a two liter soda bottle right now, but I'm going to switch to pvc, which is stronger and easier to connect. 8)
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Unread postAuthor: rednecktatertosser » Tue Jun 26, 2007 9:12 pm

There was a darwin award given for a guy who had a dryice bo*b explode between his legs, he now has a pair of silcon testes. i like those books, you cant help but laugh at some peoples lack of common sense.

On topic: I have wanted to use a sida bottle for a while now, but i guess ill stick with pvc, like the knappengineering said its easier to connect.
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