#1
Posted 11 April 2009 - 09:34 PM
This is a concept for an extremely compact Air-powered homemade. What makes it so compact is that the barrel and tank are in the pump. The entire gun would basically be a small tube with a blast button.
Here's a sketch I quickly whipped up in Microsoft Word. It's not very exact at all, but it gets the basic idea across:
To prime it, you would pump it by the barrel/tank assembly, which is also the pump. Then you would extend the pump/barrel (so you could get to the blast button), and fire it.
This would obviously involve alot of work and air gun experience, but if this design was improved upon and created, it would probably be capable of AT2K ranges, would only take a couple pumps, and it would be perfect for integrations. You could stick one anywhere.
I posted this concept so the idea would be out there, and so it can be critiqued. I have very little knowledge of how blast chambers work, so I'm curious to hear what the more knowledgable members here have to say about this design.
So, what do you think?
Probably dead by now, or something.
#2
Posted 11 April 2009 - 09:44 PM
#3
Posted 11 April 2009 - 09:53 PM
That won't work. Your blast button isn't actuating a QEV poppet and will just dump out all of the pressure.
Like I said, I have no clue how blast chambers work. Sorry about that.
But the concept of having the barrel/tank in the pump is still valid. I'm sure someone who knows what they're doing could revise the design and come up with something that would work.
I'm going to do some research on how this type of tank works, and try to come up with something more feasible.
Probably dead by now, or something.
#4
Posted 11 April 2009 - 10:19 PM
Edited by PointBlank, 11 April 2009 - 10:19 PM.
#5
Posted 11 April 2009 - 11:27 PM
This one's a little more complicated. It's the same basic idea as V1, but the blast button is inside the whole assembly, and the gun is fired by pushing the pump/barrel all the way back and engaging the blast button.
For that purpose, I added in that "Pump-Stroke Limiter," which is basically just a piece of plastic that hits the outer tube before the blast button can be enchanged. The outer tube of the assembly would be cut like the picture below, with one side shorter than the other. While pumping, the barrel is rotated so that the P-S Limiter contacts the longer side, and the blast button isn't engaged. To fire, you would rotate it so the P-S Limiter lines up with the shorter side, and push the barrel all the way back to engage the blast button and fire.
Well there's V2. Any major problems with this one?
Probably dead by now, or something.
#6
Posted 12 April 2009 - 12:15 AM
Edited by Darth Freyr, 12 April 2009 - 12:25 AM.
#7
Posted 12 April 2009 - 02:13 AM
It looks like your blast button would release air into the sealed end of the pump, which would probably be at the same pressure as the blast chamber, and do nothing.
That's a good point.
AssassinNF, you could fix this by putting another blast button at the end of the tube. Then when firing, you could hold down that button and pull the barrel back. Ooh, just got an idea, expect a modified pic of your diagram in a bit.
Here it is, does away with the pump limit thingy:
Edited by TantumBull, 12 April 2009 - 02:23 AM.
#8
Posted 12 April 2009 - 09:21 AM
EDIT: yeah, I'll work on the size of that...
EDIT 2:
Okay, one more time...
You know what?
Fuck this, here's a link:
Good fucking picture
(I tried 5 different sizes)
Edited by wing'd man, 12 April 2009 - 09:34 AM.
#9
Posted 12 April 2009 - 10:44 AM
Kruger and Dunning (1999)
#11
Posted 12 April 2009 - 11:15 AM
Kruger and Dunning (1999)
#12
Posted 12 April 2009 - 12:21 PM
<a href="http://nerfhaven.com...howtopic=20409" target="_blank">Make it pump-action</a>
#13
Posted 13 April 2009 - 12:25 AM
It looks like your blast button would release air into the sealed end of the pump, which would probably be at the same pressure as the blast chamber, and do nothing.
That's a good point.
AssassinNF, you could fix this by putting another blast button at the end of the tube. Then when firing, you could hold down that button and pull the barrel back. Ooh, just got an idea, expect a modified pic of your diagram in a bit.
Here it is, does away with the pump limit thingy:
I like that idea.
but I'm not convinced Darth Freyr's suggestion would be a problem. I figured the tank would have alot more pressure than the pump (otherwise, what's the point of the check valve?). I think the blast button would still vent enough pressure to fire it. But if not, Tantumbull came up with a great fix for it.
And after thinking about this design a little more, it wouldn't be very hard to make a slightly larger version of this out of PVC and hornet parts. I'll have another diagram up in a bit.
Probably dead by now, or something.
#14
Posted 13 April 2009 - 01:04 AM
This is a larger version of the design, made out of hornet parts. This diagram, once again, is by no means exact, and the proportions are probably terrible, but it gets the point across. I didn't put in the pump-stroke limiter stuff out of laziness. I added an extended button to the hornet blast button, because you'd kinda need it. Also, it doesn't show it in the diagram, but the blast button would have to be glued to the tank.
All you'd need is a hornet tank, a hornet blast button, a check valve chopped off a hornet, a t-connector, and some assorted PVC/o-rings. You could probably even substitute electrical tape for the o-rings if you had to.
I don't know how practical this gun would be, but I might try it if I ever get another Hornet.
Probably dead by now, or something.
#15
Posted 13 April 2009 - 08:27 AM
You'll do a lot better if you spread the lips with the front. Trying to wriggle the back in there first seems a bit counterintuitive.
RSCBow
#16
Posted 13 April 2009 - 09:11 AM
Edited by Darth Freyr, 13 April 2009 - 09:13 AM.
#17
Posted 13 April 2009 - 11:48 AM
#18
Posted 13 April 2009 - 01:24 PM
#19
Posted 13 April 2009 - 02:04 PM
#20
Posted 13 April 2009 - 02:11 PM
#21
Posted 13 April 2009 - 02:20 PM
#22
Posted 13 April 2009 - 04:25 PM
Of course, this is all rather moot, as it is contingent on being able to build a homemade back-pressure tank. Everything else is just icing.
Kruger and Dunning (1999)
#23
Posted 13 April 2009 - 04:29 PM
http://img27.imagesh...mpacthomade.gif
#24
Posted 13 April 2009 - 04:36 PM
Is that blast button permanently connecting the pump/tank body to the outside of the pump tube? That would defeat the purpose of this concept: a moveable tank that doubles as a pump.
Kruger and Dunning (1999)
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