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help with volume of air chamber...

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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help with volume of air chamber...

Unread postAuthor: Major Collins » Sun Dec 06, 2009 1:29 am

ok if i had a piece of tube 25 mm round or circumference and hrmm lets say it was a meter long how much air would fit in ?(like not being pressurized or anything, just enough to fill it up with air ) what is the math behind this ? how do i work it out?
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Unread postAuthor: randompkguy » Sun Dec 06, 2009 1:47 am

It seems you want the volume of the tube. So if you know the inner DIAMETER of the tube, you would just find the area of the circle and then multiply by the length of the tube:

area=pi(r^2)
volume=area(length of tube)
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Unread postAuthor: jackssmirkingrevenge » Sun Dec 06, 2009 1:57 am

As above, or if you're really lazy GGDT works it out automatically ;)
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Unread postAuthor: Major Collins » Sun Dec 06, 2009 2:33 am

exactly volume of the tube is what i need .... hrmm i need to find out diameter how do i do this? by the way i want this info becuase i was told if you want a double ball valve semi auto design the secondary chamber has to have the same volume as your barrel im looking into this :D
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Unread postAuthor: Major Collins » Sun Dec 06, 2009 2:56 am

ok i went and measured 2 tubes the first is 18 mm and the second one is 23 mm inner circumference and i would like to know how much air each could take if the were both a meter long .
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Unread postAuthor: john bunsenburner » Sun Dec 06, 2009 4:13 am

How old are you? I did this in 5th grade math...

so you take the inner diameter(18mm and 23mm).
Then divide it by two(for you that is 9mm and 11.5mm)
Then square them both( thats 81 and 132.25)
Then multiply by Pi( thats 254. 34 and 415.27)
Now you have the area of your tube, just one side
Multiply this by the length and you will have the volume in mm^3.
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Unread postAuthor: Major Collins » Sun Dec 06, 2009 4:26 am

im 16 and lol i did do this in grade 5 too but i forgot :D haha but after this i will rember ;)
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Unread postAuthor: john bunsenburner » Sun Dec 06, 2009 6:35 am

your 16? you see now i regret not being meaner about it...hell with 16 you start doing proper math...
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Unread postAuthor: Major Collins » Sun Dec 06, 2009 7:52 am

Math is like meh what eves i pay attention to science lol this + this = explosions whooo thats how i roll haha
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Unread postAuthor: psycix » Sun Dec 06, 2009 9:31 am

That attitude won't bring you very far.
If you really want to use science to create "explosions whooo" you will need to do research and learn proper math.

To start off you should learn how to calculate volumes and surfaces, I'm not going to spoonfeed it, the formulas are really simple and can be found within 5 seconds on google.
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Unread postAuthor: Major Collins » Sun Dec 06, 2009 9:51 am

i already know what goes boom im over that haha and i dont evan do science anymore and now i know how to calculate volumes and area i just need a kick start to remember
"immaturity keeps me young" -mychonny
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Unread postAuthor: psycix » Sun Dec 06, 2009 9:54 am

If you know how to calculate volumes and areas, then you could start learning about the use of capital letters, punctuation and paragraphs.
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Unread postAuthor: CpTn_lAw » Sun Dec 06, 2009 11:31 am

Major Collins wrote:i already know what goes boom im over that haha and i dont evan do science anymore and now i know how to calculate volumes and area i just need a kick start to remember
"immaturity keeps me young" -mychonny



Immaturity is far from "zero brain activity". Your attitude is either gonna get you injured, or nowhere at all. Time for a change.
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Unread postAuthor: Willdebeers » Sun Dec 06, 2009 1:03 pm

john bunsenburner wrote:your 16? you see now i regret not being meaner about it...hell with 16 you start doing proper math...


Yeah, well i'm jesus so shut up.










C'mon, don't flame eachother!
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Unread postAuthor: Major Collins » Sun Dec 06, 2009 6:47 pm

Yes thankyou people need to relax just have a little have fun i was joking about blowing things up -.-
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