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| sgtmik |
 Posted: 02/08/2010 10:22 AM Post subject: |
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Joined: 31 Jul 2008
Posts: 17
41.78 Spud Bux
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Spud Bud | Quote: | | know i can get more power out of a pneumatic but the problem is that i don't have a compressor and if i were to buy one portability will be an issue. And I don't think pumping up a dual chambered air cannon with a bike pump will be too efficient... |
If you don't have a compressor, buying one will be expansive and actually the cycle time will be just as long if not more long than a propane one. The bigger the tank, the smaller your compressor, the longer it will take you to shoot off a couple shoots.
My final word, go for a combustion. I am tellin' ya. Go for combustion. I have both and I enjoy my combustion for big projectiles and my air riffle for small projectiles. Here's a link to EASILY calculate your ratios and meter length, pressure etc. I found it easy to use and that using it made the construction of my combustion canon A LOT EASIER.
http://www.burntlatke.com/ft_live.html
You should know that the fuel mixture and atmospheric pressure has to stay as it is. |
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| Spud Bud |
| Posted: 02/08/2010 12:36 PM Post subject: |
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Private First Class
Joined: 07 Feb 2010
Posts: 25
68.18 Spud Bux
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Yea i was hoping to break the 900 ft/lb barrier.
Considering i made a dual chambered pneumatic with two 3'' chambers, 24'' long, will it take a vast amount of pumping to get it up to 100PSI? I was researching a bit on the piston valves and i think i would be able to make one but then again the pumping will probably take a very long time and will be tiresome I suppose. |
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| sgtmik |
| Posted: 02/08/2010 13:09 PM Post subject: |
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Joined: 31 Jul 2008
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| Im tellin ya dawg. Go for combustion |
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| Spud Bud |
| Posted: 02/08/2010 13:25 PM Post subject: |
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Private First Class
Joined: 07 Feb 2010
Posts: 25
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| sgtmik wrote: | | Im tellin ya dawg. Go for combustion |
I am going for combustion..how much didn't cost you to make yours? |
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| McCoytheGreater |
| Posted: 02/09/2010 0:03 AM Post subject: |
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Sergeant Major
Joined: 15 Dec 2009
Posts: 193
32.17 Spud Bux
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| Hubb wrote: | Is there any other reason to go with a combustion?  |
The only other reason I can think of is against forum rules.
Edited by BTB.It was still too obvious.. |
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| sgtmik |
| Posted: 02/09/2010 9:33 AM Post subject: |
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[/quote]Spud Bud
I am going for combustion..how much didn't cost you to make yours? | Quote: |
About 100$ actualy. It wasn't too bad. But I added stuff since then so now it cost me about 20$ more. And it includes the 13% taxe i am paying (fork the canadian taxes!!). So for a hundre bucks, i think you are go to go. Don't buy a chamber fan yet. Go for the main component. Chamber, barel, propane, propane meter and ignition (BBQ). | |
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| Hubb |
| Posted: 02/09/2010 11:57 AM Post subject: |
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Major General
Joined: 28 May 2007
Posts: 2410
701.43 Spud Bux
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| sgtmik wrote: | | Im tellin ya dawg. Go for combustion | That statement is just about sig-worthy...  |
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| sgtmik |
| Posted: 02/09/2010 16:43 PM Post subject: |
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Private
Joined: 31 Jul 2008
Posts: 17
41.78 Spud Bux
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| God! Can anyone help me doing a good well made quote. I donT understand how they work! |
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| Spud Bud |
| Posted: 02/09/2010 18:12 PM Post subject: |
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Private First Class
Joined: 07 Feb 2010
Posts: 25
68.18 Spud Bux
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Alright then, when i gather up all the components,hopefully under a month  , I will post up some pics of the finished cannon. Thanks |
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| DR |
| Posted: 03/09/2010 14:20 PM Post subject: Chamber length estimate is too long |
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2nd Lieutenant
Joined: 08 Oct 2004
Posts: 200
615.39 Spud Bux
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In your beginning post, you stated:
| Quote: | | I was thinking of a 4in chamber, 25in long with either a golf ball, tennis ball, or plain'ol 2in barrel of possibly even all these setups with interchangeable barrels. |
With a 25 inch long, 4" SCH40 Chamber - you would need a golf ball barrel that is 197-1/2" long. (almost 16-1/2 feet)...
you would need a tennis ball barrel that is 95.49" long (almost 8 feet)...
you would need a "plain 'ol 2 inch barrel" that is 136 inches long (11' 4")
Surprises me that everyone had overlooked this. This topic was posted what... a month ago? I hope that dude didn't really make his chamber that long.
The most important thing you need to do before building your chamber, is determining what size/length barrel you will slap on it.
The biggest barrel would be the 2-1/2" Tennis Ball barrel. The chamber would only need to be just shy of 19" long, to support (volume-wise @ 0.7:1) a 6 foot long barrel. - Total length: just shy of 8 feet.
So, unless you weigh over 140 pounds soaking wet... that's a huge cannon to handle.
A 4-foot long tennis ball barrel is much easier to handle and the chamber only need be a little over 12-1/2" long.
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