Special Ops Paintball: Paintball Howitzer - Special Ops Paintball

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Paintball Howitzer no, not a Bazooka! Rate Topic: -----

#31 User is offline   Lyian 

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Posted 02 July 2009 - 11:07 AM

View PostCesar, on Jul 1 2009, 05:36 PM, said:

honestly, you should have no problems with the SCH 40 PVC connectors, especially at such low pressures.....


EDIT:

ok, heres a basic design that should work well...

your going to want to make two sub-assemblies like this:
Posted Image

and then assemble the two sub-assemblies like this.....
Posted Image


this is if you are using a 3" diameter barrel that is 3' long.......


as for a valve, ide suggest looking into a modded sprinkler valve, a ball valve will work just fine, however a sprinkler valve will give you more consistent results.



Why are you showing 2 T's in the first diagram, but only 2 in the second?

and is it necessary to connect both ends to each other?

second, i might concider the sprinkelr valve, but im trying to avoid using anything automatic. Sides, to they even make a 1" sprinkler valve?

This post has been edited by Lyian: 02 July 2009 - 11:11 AM

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#32 Guest_Cesar_*

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Posted 02 July 2009 - 12:02 PM

View PostLyian, on Jul 2 2009, 02:07 PM, said:

View PostCesar, on Jul 1 2009, 05:36 PM, said:

honestly, you should have no problems with the SCH 40 PVC connectors, especially at such low pressures.....


EDIT:

ok, heres a basic design that should work well...

your going to want to make two sub-assemblies like this:
Posted Image

and then assemble the two sub-assemblies like this.....
Posted Image


this is if you are using a 3" diameter barrel that is 3' long.......


as for a valve, ide suggest looking into a modded sprinkler valve, a ball valve will work just fine, however a sprinkler valve will give you more consistent results.



Why are you showing 2 T's in the first diagram, but only 2 in the second?

and is it necessary to connect both ends to each other?

second, i might concider the sprinkelr valve, but im trying to avoid using anything automatic. Sides, to they even make a 1" sprinkler valve?


because you are going to make 2 of the first drawing.....and assemble them like the second drawing....so you will have a total 4, 2 foot sections of 2" pipe.

like this:
Posted Image
the red is the top chamber
the black is the bottom chamber
the blue is the pipe connecting the top and bottom chambers.


and yes, they do make 1" sprinkler valves.
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#33 User is offline   Lyian 

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Posted 02 July 2009 - 12:26 PM

View PostCesar, on Jul 2 2009, 03:02 PM, said:

because you are going to make 2 of the first drawing.....and assemble them like the second drawing....so you will have a total 4, 2 foot sections of 2" pipe.



why two? i need to sketch up the idea i had in mind.
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#34 Guest_Cesar_*

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Posted 02 July 2009 - 01:03 PM

View PostLyian, on Jul 2 2009, 03:26 PM, said:

View PostCesar, on Jul 2 2009, 03:02 PM, said:

because you are going to make 2 of the first drawing.....and assemble them like the second drawing....so you will have a total 4, 2 foot sections of 2" pipe.



why two? i
need to sketch up the idea i had in mind.

because if you only use one, you wont have enough air volume to shoot a projectile.\

a 3" diam barrel need a TON of air, especially at the 4-5' lengths you are thinking

This post has been edited by Cesar: 02 July 2009 - 01:04 PM

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#35 User is offline   Lyian 

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Posted 03 July 2009 - 12:28 AM

View PostCesar, on Jul 2 2009, 04:03 PM, said:

View PostLyian, on Jul 2 2009, 03:26 PM, said:

View PostCesar, on Jul 2 2009, 03:02 PM, said:

because you are going to make 2 of the first drawing.....and assemble them like the second drawing....so you will have a total 4, 2 foot sections of 2" pipe.



why two? i
need to sketch up the idea i had in mind.

because if you only use one, you wont have enough air volume to shoot a projectile.\

a 3" diam barrel need a TON of air, especially at the 4-5' lengths you are thinking



I was wondering how much cubic air i would need for such a thing. I was thinking three chambers, but not arranged like that (i know that layout isnt necessary) Think i need 4 chambers of 2"x3' then?

Also, what is the formula for figuring out how much air ill need?
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#36 Guest_Cesar_*

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Posted 03 July 2009 - 07:58 PM

View PostLyian, on Jul 3 2009, 03:28 AM, said:

View PostCesar, on Jul 2 2009, 04:03 PM, said:

View PostLyian, on Jul 2 2009, 03:26 PM, said:

View PostCesar, on Jul 2 2009, 03:02 PM, said:

because you are going to make 2 of the first drawing.....and assemble them like the second drawing....so you will have a total 4, 2 foot sections of 2" pipe.



why two? i
need to sketch up the idea i had in mind.

because if you only use one, you wont have enough air volume to shoot a projectile.\

a 3" diam barrel need a TON of air, especially at the 4-5' lengths you are thinking



I was wondering how much cubic air i would need for such a thing. I was thinking three chambers, but not arranged like that (i know that layout isnt necessary) Think i need 4 chambers of 2"x3' then?

Also, what is the formula for figuring out how much air ill need?



the volume of a cylinder is Pi x r^2 x H

so a 3" barrel 4 feet long is:

3.14 x 9 x 48 = 1365 cu. in.

a pressure chamber 2 feet long has 301 cu.in.

so multiply that by 4 pressure chambers gives you 1204 cu. in.

if you want 3 pressure chambers of 3 feet long you will have 1356 cu.in. which is enough, however im not certain how you would configure it.

This post has been edited by Cesar: 03 July 2009 - 08:14 PM

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#37 User is offline   Lyian 

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Posted 03 July 2009 - 10:41 PM

View PostCesar, on Jul 3 2009, 10:58 PM, said:

the volume of a cylinder is Pi x r^2 x H

so a 3" barrel 4 feet long is:

3.14 x 9 x 48 = 1365 cu. in.

a pressure chamber 2 feet long has 301 cu.in.

so multiply that by 4 pressure chambers gives you 1204 cu. in.

if you want 3 pressure chambers of 3 feet long you will have 1356 cu.in. which is enough, however im not certain how you would configure it.



um.. yea, but isnt their more air when its pressurized? so if their is 301 cu/in of air in a 2' long chamber under normal pressure, wouldnt forcing more air into it increase the pressure (hence why the pressure goes up?) or am i off?

What im getting as is, can you not get the same amount of air in a smaller chamber, the higher the pressure of that chamber is?

This post has been edited by Lyian: 03 July 2009 - 10:57 PM

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Posted 05 July 2009 - 07:53 AM

if i am not mistaken, if you have a chamber at 1ATM you will have X amount of air.....if you then place that chamber at 2ATM you will then have 2X amount of air...


and you can get away with using a 3/4" 1' long air chamber if you are running at 800+ PSI...

...but because your pressures are so low, matching the volume of the barrel to the volume of the airchamber is the your simplest and safest bet for having a decent launcher.....


paintball launchers arent an exact science....its kind of the Alchemy of the paintball world....
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#39 User is offline   XziviT 

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Posted 05 July 2009 - 01:50 PM

View PostBobbjoe, on Jun 24 2009, 08:35 PM, said:

Most people don't want to get hit by a plastic bottle going 80 mph...


You got a point mate..

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#40 User is offline   splntercell 

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Posted 07 July 2009 - 05:49 PM

Here is a couple pics of my work in progress to give you some ideas. Its just the working guts I am going to start dressing it up soon.

Posted Image

Posted Image
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#41 User is offline   Lyian 

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Posted 07 July 2009 - 09:16 PM

View Postsplntercell, on Jul 7 2009, 08:49 PM, said:

Here is a couple pics of my work in progress to give you some ideas. Its just the working guts I am going to start dressing it up soon.



nice, but i dont suppose you have any pics of it without the wood casing? :laugh:
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#42 User is offline   splntercell 

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Posted 08 July 2009 - 05:31 PM

View PostLyian, on Jul 8 2009, 12:16 AM, said:

View Postsplntercell, on Jul 7 2009, 08:49 PM, said:

Here is a couple pics of my work in progress to give you some ideas. Its just the working guts I am going to start dressing it up soon.



nice, but i dont suppose you have any pics of it without the wood casing? :D


I took off as much of the wood as i could in these pics.

Posted Image


Posted Image

I am using a 26 inch x 4 inch expansion chamber, a 6 foot x 3 inch barrel, and a modded sprinkler vaulve to fire it. On the front of the expansion chamber i have a pressure relief vaulve set to 100 psi, and on the back there is a gauge and a regulator.
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#43 User is offline   Lyian 

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Posted 08 July 2009 - 09:11 PM

View Postsplntercell, on Jul 8 2009, 08:31 PM, said:

View PostLyian, on Jul 8 2009, 12:16 AM, said:

View Postsplntercell, on Jul 7 2009, 08:49 PM, said:

Here is a couple pics of my work in progress to give you some ideas. Its just the working guts I am going to start dressing it up soon.



nice, but i dont suppose you have any pics of it without the wood casing? :(


I took off as much of the wood as i could in these pics.


I am using a 26 inch x 4 inch expansion chamber, a 6 foot x 3 inch barrel, and a modded sprinkler vaulve to fire it. On the front of the expansion chamber i have a pressure relief vaulve set to 100 psi, and on the back there is a gauge and a regulator.


a modded sprinkler valve? are not all sprinkler valves electronic? or is that pretty much just a ball valve?

This post has been edited by Lyian: 08 July 2009 - 09:11 PM

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#44 User is offline   splntercell 

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Posted 09 July 2009 - 06:24 AM

View PostLyian, on Jul 9 2009, 12:11 AM, said:

View Postsplntercell, on Jul 8 2009, 08:31 PM, said:

View PostLyian, on Jul 8 2009, 12:16 AM, said:

View Postsplntercell, on Jul 7 2009, 08:49 PM, said:

Here is a couple pics of my work in progress to give you some ideas. Its just the working guts I am going to start dressing it up soon.



nice, but i dont suppose you have any pics of it without the wood casing? :rolleyes:


I took off as much of the wood as i could in these pics.


I am using a 26 inch x 4 inch expansion chamber, a 6 foot x 3 inch barrel, and a modded sprinkler vaulve to fire it. On the front of the expansion chamber i have a pressure relief vaulve set to 100 psi, and on the back there is a gauge and a regulator.


a modded sprinkler valve? are not all sprinkler valves electronic? or is that pretty much just a ball valve?


Its not a ball valve the basic operation of a sprinkler valve ther is a rubbe stopper at the end of the electronic selinoid. The stopper blocks a small hole above the diaphragm. When the selinoid is charged it slowly let's out the back pressure on the diaphragm that opens the valve. Modding the valve replaces the selinoid with an air compressor blowgun and increases the size of the hole and filling in the pass through hole. This makes the valve open instantly when you hit the blowgun trigger. I am on my blackberry right now when I get home I can go more in depth.
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#45 Guest_Cesar_*

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Posted 09 July 2009 - 06:48 AM

View PostLyian, on Jul 9 2009, 12:11 AM, said:

a modded sprinkler valve? are not all sprinkler valves electronic? or is that pretty much just a ball valve?


look here this will tell you just about everything you need to know.
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