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| Wrath Ordanace |
 Posted: 08/28/2008 21:03 PM Post subject: Supply Chamber Size. |
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Private
Joined: 27 Aug 2008
Posts: 3
7.77 Spud Bux
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What size supply chamber do I need???
I want to fire a Nerf Vortex from a 2" Barrel, 18" long. Sprinkler valve system and I need my supply chamber to be only 1' long or less and on a 60degree down slope to hide in a stock.
Also I plan on using a smaller diameter steel tubing for the supply chamber, of course it will be regulated, but I need more info on sizes and PSI.
Any ideas? |
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| Hotwired |
| Posted: 08/28/2008 21:18 PM Post subject: |
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UK Spudgunner
Joined: 13 Oct 2006
Posts: 1800
3889.01 Spud Bux
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No idea whatsoever.
A chap comes up to you with a dried pea, asks you what size rubber band he needs to ping it about with.
What kind of answer can you give him?
So. YOU are going to have to say what kind of pressure you have available, be that a foot pump, compressor or gas cylinder. Also the kind of speed the nerf is supposed to have, for which knowing the weight of it would be very helpful.
The answer will in the end be from a program called GGDT which if you search for, download and fiddle with yourself will save you time and be of interest in the future for any other air projects. |
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| VH_man |
| Posted: 08/28/2008 21:36 PM Post subject: |
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Swimmaman
Joined: 09 Dec 2006
Posts: 1497
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| Wrath Ordanace |
| Posted: 08/29/2008 15:22 PM Post subject: |
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Private
Joined: 27 Aug 2008
Posts: 3
7.77 Spud Bux
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Sorry for the illinformed question guys. I had very little sleep yesterday and wasn't even sure on some of my measurements.
Aside from the sizes I already gave. The rocket weighs approx 2.6 oz and has a diameter of 2.16 inches. I want to be able to fire the rocket at 240fps at 150-200 psi using compressed air.
Thanks for the spoonful of info with the program, I will check it out and let you know what I find. Thanks guys. |
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| Hotwired |
| Posted: 08/29/2008 16:09 PM Post subject: |
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UK Spudgunner
Joined: 13 Oct 2006
Posts: 1800
3889.01 Spud Bux
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As you'll likely have not much idea about how to use GGDT I'll post a screenshot at what your setup would look like in it:
The valve data was from the GGDT library where there's data for a 2" sprinkler valve. You won't need to change anything there.
The only input you were wondering about was the chamber, you can change the ID (used 1.25") and length (used 12") on the left, maybe even fiddle with the pressure (used 200psi) to see what you get. |
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| vovka351 |
| Posted: 08/29/2008 18:12 PM Post subject: |
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Private First Class
Joined: 30 Jun 2008
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| I don't recall seeing affordable 2" sprinkler valves, nor are they usually rated to 200 psi |
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| Wrath Ordanace |
| Posted: 08/29/2008 19:02 PM Post subject: |
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Private
Joined: 27 Aug 2008
Posts: 3
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No, they are ussually rated for 160psi or so, but I could use the program however I am having trouble opening the executable file. So I'm still working on that.
You can get higher rated ball valves, but I really like the use of a blogun as a relief trigger mechanism. |
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