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Coke bottle strafer (short burst)

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Coke bottle strafer (short burst)

Unread postAuthor: Solo » Tue Apr 10, 2007 6:18 pm

I had a crazy idea for a dirt-cheap plastic soda bottle bb strafer. Have a 3' barrel with the breach end epoxied closed, a few small holes drilled in the barrel about 1' from the breach end to let the air in. then glue the barrel in thru a hole a bottle cap, so that the air holes are just inside the bottle. Put a ball valve in the barrel right outside of the cap. Put a schrader valve through the bottom of the bottle. That's your gun.

How it works: load your bb's down the barrel. Close the ball valve. Pump the bottle up. Open the ball valve. The gun operates on the Vogt cycle, firing one bb at a time until they are all gone. It also owes the ball valve and the mag-in-chamber idea from Jack/FMJ. Then the rest of the air probably just gets vented. (Unless you wanted to put a second ball valve on the barrel, and then you could use the space between them as an 'air lock' to load bbs while there is still pressure in the bottle.)

In the States, 1/2" sch40 PVC pipe is available that fits nicely inside the mouth of your standard soda bottle. You could build the gun around that, giving it handles and a barrel shroud.
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Unread postAuthor: super spuder » Tue Apr 10, 2007 6:31 pm

kool idea. just dont take the soda bottle up past 100 psi or else you will need a new bottle and new ear drums :lol: (soda bottles blow up at 120-130 psi)(and they are very loud) :wink: :thumbright:
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Unread postAuthor: Scope » Tue Apr 10, 2007 7:41 pm

2 litter soda bottles are ok at 100 psi...
i suspect smaller ones would be even better actualy


nice ideas
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Unread postAuthor: Solo » Wed Apr 11, 2007 8:06 am

Thanks!

Yeah, I blew up a bottle one time. Well, it broke where I had the schrader stuck through the bottom of the bottle, and I thought I'd blown myself up, but then I was like "whoah, I'm still in one piece, how did that happen?"
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Unread postAuthor: FeLeX » Wed Apr 11, 2007 8:25 am

Hey man sorry to bother you but could you draw up a diagram for that its kinda hard for me to understand.
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Unread postAuthor: Solo » Wed Apr 11, 2007 1:04 pm

It's really quite simple. I drew up the basic thing w/o the 1/2" PVC housing I actually would probably use if I built it. Let's see if this works:
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Edit: hooray, it does! It's kinda grainy, though, but I guess that ought to do.
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Unread postAuthor: paaiyan » Wed Apr 11, 2007 1:30 pm

What's to keep the bb's from coming out that air hole? And I'd think the compresed gas would most likely escape from the same hole and rob power from the bb's.

EDIT: It also appears that you would really ned to line that ball valve up perfectly and quickly in order for them to pass through. That might be difficult.
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Unread postAuthor: zeigs spud » Wed Apr 11, 2007 2:55 pm

Solo wrote:It's really quite simple. I drew up the basic thing w/o the 1/2" PVC housing I actually would probably use if I built it. Let's see if this works:
Image

Edit: hooray, it does! It's kinda grainy, though, but I guess that ought to do.


yea nothing keeps bb's from going out back or through air hole, which is useless and acualy would be bad for performance if you were to put bb's behind it.
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Unread postAuthor: super spuder » Wed Apr 11, 2007 2:58 pm

or you could put a couple of small air holes behind the all of the bbs and then when you open the ball valve all the bbs come flying out at once like a shot gun :blob5: that would be cool
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Unread postAuthor: paaiyan » Wed Apr 11, 2007 3:16 pm

Or you could just leave a hole in the back of that tube. Put two tiny holes through it at the back and thread a thin piece of wire through and tie it to itself. This would prevent the bb's from exiting the back of the tube and allow for maximum airflow. That still doesnt solve the ball valve problem though.
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Unread postAuthor: Scope » Wed Apr 11, 2007 3:59 pm

the whole isnt big enough for the bbs to fit through.. simple enough
thats why they wont go through
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Unread postAuthor: paaiyan » Wed Apr 11, 2007 4:14 pm

OK well what's it for?
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Unread postAuthor: zeigs spud » Wed Apr 11, 2007 4:20 pm

paaiyan wrote:Or you could just leave a hole in the back of that tube. Put two tiny holes through it at the back and thread a thin piece of wire through and tie it to itself. This would prevent the bb's from exiting the back of the tube and allow for maximum airflow. That still doesnt solve the ball valve problem though.


yeah, lol idk why ppl thiink extra holes do anything at all to help.
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Unread postAuthor: paaiyan » Wed Apr 11, 2007 4:30 pm

I don't know, my thought is that hole towards the front will allow the air to escape the barrel and leave the bb's relatively unscathed.
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 11, 2007 11:22 pm

no need for any extra holes, just make the magazine pipe of a slightly bigger I/D (say 8mm)
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