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| jinxd |
 Posted: 12/13/2005 14:34 PM Post subject: Combustion Painball Gun |
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Private
Joined: 18 Oct 2005
Posts: 16
29.54 Spud Bux
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Before anyone says anything, I know, don't shoot people with a homemade paintball gun, the ammo commoness is why I want to make one.
Im attaching a small, simple drawing describing my idea for the gun. Its a plain vanilla gun, nothing fancy, the usual RightGuard and grill peizo ignitor. The reason I'm posting is because I want to get it right before I waste money on the wrong things. I decided to use the male/female threaded fittings for later expansion (several barrels). Im also choosing CPVC for the barrel because from what I've read that is a perfect size for paintballs. Also, I calculated out the volume ratio with RatCalc and its ~0.81:1 (C:B). Well, I can't really elaborate much more... any suggestions or flaws?
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| TalonXxX |
| Posted: 12/13/2005 16:25 PM Post subject: |
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Master Sergeant
Joined: 16 Oct 2005
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I wouldn't step down your chamber from 1.5" to .75" since 1.5" is small enough. I would step up your barrel from .75" to 1.5" That way, you are able to take advantage of your male/female adapters by adding barrels up to 1.5" without the restriction of reduced flow. You don't want your barrel to be larger than your chamber because that creates a bottleneck at the male/female adapters and greatly reduces performance. Your design is fine... I would just change the reducer coupling to be on the barrel rather than the chamber.
So instead of the 1.5" to .75" reducer on the chamber, put a 1.5" female adapter and then on the barrel, put a 1.5" male adapter to 1.5" pipe to 1.5" to .75" reducer to .75" pipe. That will allow barrel sizes up to 1.5" with increased performance.
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| taterjim |
| Posted: 12/13/2005 21:17 PM Post subject: |
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Staff Sergeant
Joined: 23 Jul 2005
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| A 1.5" barrel on a 1.5" chamber would not work well .with that small of a chamber 3/4 " is about the largest barrel I would use. I wouldn't change a thing.
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| jinxd |
| Posted: 12/14/2005 7:48 AM Post subject: |
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| jinxd |
| Posted: 12/15/2005 9:32 AM Post subject: |
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Joined: 18 Oct 2005
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The gun has been built! 
Now, today I fire it and upload pictures.
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| julz |
| Posted: 12/16/2005 22:38 PM Post subject: |
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Sergeant Major
Joined: 18 Apr 2005
Posts: 178
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| looking forward t o ti. would ya mind posting prices? im gunna make a combustion but dont want to spend a lot of money so a simple gun like this would b very good. thx
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| jinxd |
| Posted: 12/25/2005 11:39 AM Post subject: |
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| Cronic |
| Posted: 12/25/2005 15:43 PM Post subject: |
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Joined: 24 Oct 2005
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| I have to say nice combustion indeed. Anyway how do you hold it because I don't see any room between the grip and the gun?
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| jinxd |
| Posted: 12/25/2005 16:33 PM Post subject: |
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| You can hold it like a rifle, with the cap against your shoulder. It actually has a quite nice feel to it.
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| guitarfreak |
| Posted: 12/25/2005 20:33 PM Post subject: |
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| jinxd wrote: | | You can hold it like a rifle, with the cap against your shoulder. It actually has a quite nice feel to it. | no no no no no,if the end cap blows off,you will get a broken shoulder
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| boilingleadbath |
| Posted: 12/27/2005 11:34 AM Post subject: |
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Guitarfreak, that's a pressure rated endcap. If he attempts any semblance of screwing it on, it will hold - most cap failures involve thin cleanout plugs (which are a terrible shape for holding pressure anyway) shattering, although there is the occasional event where one uses a non-pressure rated cap with some sort of odd threads (which these arn't).
The gist of that is that it won't "blow off".
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| jinxd |
| Posted: 12/28/2005 22:00 PM Post subject: |
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| Plus, look at the size of the gun.
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