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Why does no one make 12g co2 air guns/cannons?

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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Why does no one make 12g co2 air guns/cannons?

Unread postAuthor: valin » Sun Jul 17, 2016 11:06 am

Hey guys,

New to all this, but I'm surprised that this isn't a common source of propellant, especially with all of the quick change adapters available. Can anyone fill me in to why these designs are not more popular?
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Re: Why does no one make 12g co2 air guns/cannons?

Unread postAuthor: matti » Thu Jul 21, 2016 5:25 am

Hey,

it's mostly because they are so small and cost some money. Decent size spudgun would need one cartridge with every shot..
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Re: Why does no one make 12g co2 air guns/cannons?

Unread postAuthor: jimmy101 » Thu Jul 21, 2016 6:42 pm

Like Matti said, a 12g CO2 cartridge on a spud gun would be like using one on a paintball gun.
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Re: Why does no one make 12g co2 air guns/cannons?

Unread postAuthor: jackssmirkingrevenge » Mon Jul 25, 2016 4:03 am

jimmy101 wrote:Like Matti said, a 12g CO2 cartridge on a spud gun would be like using one on a paintball gun.


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Re: Why does no one make 12g co2 air guns/cannons?

Unread postAuthor: jimmy101 » Mon Jul 25, 2016 1:19 pm

Like I said. It is a dumb idea. The 12g is what, about 5% the volume of a standard paintball CO2 cylinder?
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Re: Why does no one make 12g co2 air guns/cannons?

Unread postAuthor: Gippeto » Mon Jul 25, 2016 8:51 pm

12gram would make for a very portable setup...but HOW much more portable than a 3.5 or 9 ounce tank? And then there's the cost factor to consider....12gram cartridges are THE most expensive way to purchase CO2. Paintball tanks are more affordable long term...bulk tanks are even cheaper...long term.
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Re: Why does no one make 12g co2 air guns/cannons?

Unread postAuthor: jackssmirkingrevenge » Tue Jul 26, 2016 4:46 am

You typically get 30-40 shots from such a setup, it's silly compared to over 500 shots you'd get from a 12 oz tank but useful for some people who do military simulation and don't lay down a lot of fire (or used to be, most of them have moved to airsoft now) or who don't have access to bulk CO2.
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Re: Why does no one make 12g co2 air guns/cannons?

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Re: Why does no one make 12g co2 air guns/cannons?

Unread postAuthor: velocity3x » Tue Jul 26, 2016 1:28 pm

valin wrote:Hey guys,

New to all this, but I'm surprised that this isn't a common source of propellant, especially with all of the quick change adapters available. Can anyone fill me in to why these designs are not more popular?


You probably can't imagine how brutally expensive it is to design, manufacture and operate something of that size.
This one was $8.00 per shot.
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Re: Why does no one make 12g co2 air guns/cannons?

Unread postAuthor: valin » Sat Jul 30, 2016 1:09 pm

I see what you guys mean with cost, but are you thinking in terms of single shot cannons, expelling all the force of the 12g in one swoop? I was thinking about using it for multiple (yet still few) shots, and taking advantage of the compact size & quick reload of CO2, generally for the purposes of paintball/airsoft game play.
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Re: Why does no one make 12g co2 air guns/cannons?

Unread postAuthor: Dig_Gil » Wed Sep 14, 2016 4:40 pm

Sure it can be done. I've considered an hybrid compressed air/CO2 design (where a CO2 cartridge is used as back up when main pressure dwindles) so to help regulation. It's highly convenient and (if your launcher isn't too large) powerful. But free atmospheric air is much cheaper and you're only require to expend energy on a pump. If you are really cheap you can even compress it by hand and forget about paying a gym!

CO2, on the other hand, isn't eco-friendly renewable energy ;-) . Another downside of CO2 (although not a big deal if you deliver it through a regulator) is that its pressure is dependent on temperature. If it gets cold, your launcher will be weaker. Usually it requires a expansion chamber which will get cold as more CO2 evaporates to fill in the chamber, thus you lose pressure unless you allow it to heat up. As I said, these downsides aren't a problem in small applications where you don't need much pressure or volume. Usually we, here, build tubes to launch potato sized objects which require hugh-mongous volume.
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Re: Why does no one make 12g co2 air guns/cannons?

Unread postAuthor: biged » Fri Nov 11, 2016 12:23 pm

matti wrote:
Decent size spudgun would need one cartridge with every shot..


^^^ This.

Made a chart long ago by unloading an entire 12g CO2 cartridge with the PSI results vs Chamber size in cubic inches.
This is at 72 degrees. Hotter and psi goes up, colder and the psi drops.

Code: Select all
6 Cubic inches 700 psi
7 Cubic inches 600 psi
8 Cubic inches 525 psi
9 Cubic inches 466.666667 psi
10 Cubic inches 420 psi
11 Cubic inches 381.818182 psi
12 Cubic inches 350 psi
13 Cubic inches 323.076923 psi
14 Cubic inches 300 psi
15 Cubic inches 280 psi
16 Cubic inches 262.5 psi
17 Cubic inches 247.058824 psi
18 Cubic inches 233.333333 psi
19 Cubic inches 221.052632 psi
20 Cubic inches 210 psi
21 Cubic inches 200 psi
22 Cubic inches 190.909091 psi
23 Cubic inches 182.608696 psi
24 Cubic inches 175 psi
25 Cubic inches 168 psi
26 Cubic inches 161.538462 psi
27 Cubic inches 155.555556 psi
28 Cubic inches 150 psi
29 Cubic inches 144.827586 psi
30 Cubic inches 140 psi
31 Cubic inches 135.483871 psi
32 Cubic inches 131.25 psi
33 Cubic inches 127.272727 psi
34 Cubic inches 123.529412 psi
35 Cubic inches 120 psi
36 Cubic inches 116.666667 psi
37 Cubic inches 113.513514 psi
38 Cubic inches 110.526316 psi
39 Cubic inches 107.692308 psi
40 Cubic inches 105 psi
41 Cubic inches 102.439024 psi
42 Cubic inches 100 psi
43 Cubic inches 97.6744186 psi
44 Cubic inches 95.4545455 psi
45 Cubic inches 93.3333333 psi
46 Cubic inches 91.3043478 psi
47 Cubic inches 89.3617021 psi
48 Cubic inches 87.5 psi
49 Cubic inches 85.7142857 psi
50 Cubic inches 84 psi
51 Cubic inches 82.3529412 psi
52 Cubic inches 80.7692308 psi
53 Cubic inches 79.245283 psi
54 Cubic inches 77.7777778 psi
55 Cubic inches 76.3636364 psi
56 Cubic inches 75 psi
57 Cubic inches 73.6842105 psi
58 Cubic inches 72.4137931 psi
59 Cubic inches 71.1864407 psi
60 Cubic inches 70 psi
61 Cubic inches 68.852459 psi
62 Cubic inches 67.7419355 psi
63 Cubic inches 66.6666667 psi
64 Cubic inches 65.625 psi
65 Cubic inches 64.6153846 psi
66 Cubic inches 63.6363636 psi
67 Cubic inches 62.6865672 psi
68 Cubic inches 61.7647059 psi
69 Cubic inches 60.8695652 psi
70 Cubic inches 60 psi
71 Cubic inches 59.1549296 psi
72 Cubic inches 58.3333333 psi
73 Cubic inches 57.5342466 psi
74 Cubic inches 56.7567568 psi
75 Cubic inches 56 psi
76 Cubic inches 55.2631579 psi
77 Cubic inches 54.5454545 psi
78 Cubic inches 53.8461538 psi
79 Cubic inches 53.164557 psi
80 Cubic inches 52.5 psi
81 Cubic inches 51.8518519 psi
82 Cubic inches 51.2195122 psi
83 Cubic inches 50.6024096 psi
84 Cubic inches 50 psi
85 Cubic inches 49.4117647 psi
86 Cubic inches 48.8372093 psi
87 Cubic inches 48.2758621 psi
88 Cubic inches 47.7272727 psi
89 Cubic inches 47.1910112 psi
90 Cubic inches 46.6666667 psi
91 Cubic inches 46.1538462 psi
92 Cubic inches 45.6521739 psi
93 Cubic inches 45.1612903 psi
94 Cubic inches 44.6808511 psi
95 Cubic inches 44.2105263 psi
96 Cubic inches 43.75 psi
97 Cubic inches 43.2989691 psi
98 Cubic inches 42.8571429 psi
99 Cubic inches 42.4242424 psi
100 Cubic inches 42 psi
101 Cubic inches 41.5841584 psi
102 Cubic inches 41.1764706 psi
103 Cubic inches 40.776699 psi
104 Cubic inches 40.3846154 psi
105 Cubic inches 40 psi
106 Cubic inches 39.6226415 psi
107 Cubic inches 39.2523364 psi
108 Cubic inches 38.8888889 psi
109 Cubic inches 38.5321101 psi
110 Cubic inches 38.1818182 psi
111 Cubic inches 37.8378378 psi
112 Cubic inches 37.5 psi
113 Cubic inches 37.1681416 psi
114 Cubic inches 36.8421053 psi
115 Cubic inches 36.5217391 psi
116 Cubic inches 36.2068966 psi
117 Cubic inches 35.8974359 psi
118 Cubic inches 35.5932203 psi
119 Cubic inches 35.2941176 psi
120 Cubic inches 35 psi
121 Cubic inches 34.7107438 psi
122 Cubic inches 34.4262295 psi
123 Cubic inches 34.1463415 psi
124 Cubic inches 33.8709677 psi
125 Cubic inches 33.6 psi
126 Cubic inches 33.3333333 psi
127 Cubic inches 33.0708661 psi
128 Cubic inches 32.8125 psi
129 Cubic inches 32.5581395 psi
130 Cubic inches 32.3076923 psi
131 Cubic inches 32.0610687 psi
132 Cubic inches 31.8181818 psi
133 Cubic inches 31.5789474 psi
134 Cubic inches 31.3432836 psi
135 Cubic inches 31.1111111 psi
136 Cubic inches 30.8823529 psi
137 Cubic inches 30.6569343 psi
138 Cubic inches 30.4347826 psi
139 Cubic inches 30.2158273 psi
140 Cubic inches 30 psi
141 Cubic inches 29.787234 psi
142 Cubic inches 29.5774648 psi
143 Cubic inches 29.3706294 psi
144 Cubic inches 29.1666667 psi
145 Cubic inches 28.9655172 psi
146 Cubic inches 28.7671233 psi
147 Cubic inches 28.5714286 psi
148 Cubic inches 28.3783784 psi
149 Cubic inches 28.1879195 psi
150 Cubic inches 28 psi
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