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first ball valve air gun

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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first ball valve air gun

Unread postAuthor: streetfire » Thu May 19, 2011 1:34 pm

this is my first rifle (that works!) it fires homemade darts at a max of 30 bar

pic here

the gun
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sight for the show :shock:
Image

28 bar can go further
Image

the damage
Image
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Unread postAuthor: Copperboy » Thu May 19, 2011 1:42 pm

Nice gun!

Don't bother pumping above 3 bar or so, before you´ve opened that ball valve the dart will be long gone.
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Unread postAuthor: streetfire » Thu May 19, 2011 1:51 pm

Copperboy wrote:Nice gun!

Don't bother pumping above 3 bar or so, before you´ve opened that ball valve the dart will be long gone.

really? it gets more range with more bars at 17 normal firing pressure it goes 120 + meter
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Unread postAuthor: FighterAce » Thu May 19, 2011 1:57 pm

He's exaggerating... a bit... you can't use all of that potential at 30 bar with no firing mechanism and such a short barrel. I think you'd see a bigger improvement by speeding up the ball valve with a spring instead of increasing the pressure.

EDIT

Don't go over 28 bar!! I had a similar pump and the pressure gauge blew off at over 30 bar with a large chunk of the plastic body. Those little pumps are Not safe for large chambers and for pressures higher than 28 bar. Thats why they say "do not go over 28 bar" on the package.
Build yourself a stirrup pump... you'll get higher pressure, more volume and more durability from it.
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Unread postAuthor: streetfire » Thu May 19, 2011 2:07 pm

FighterAce wrote:He's exaggerating... a bit... you can't use all of that potential at 30 bar with no firing mechanism and such a short barrel. I think you'd see a bigger improvement by speeding up the ball valve with a spring instead of increasing the pressure.

my next gun will have a qev and a longer barrel although the barrel is already like 40 centimetres long
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Unread postAuthor: Labtecpower » Thu May 19, 2011 2:13 pm

I have to promote myself again. You will get about 3 times the power you have right now, according to my tests.
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Unread postAuthor: Doctore » Thu May 19, 2011 3:06 pm

Simple like mine :D
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Unread postAuthor: streetfire » Thu May 19, 2011 4:06 pm

FighterAce wrote:He's exaggerating... a bit... you can't use all of that potential at 30 bar with no firing mechanism and such a short barrel. I think you'd see a bigger improvement by speeding up the ball valve with a spring instead of increasing the pressure.

EDIT

Don't go over 28 bar!! I had a similar pump and the pressure gauge blew off at over 30 bar with a large chunk of the plastic body. Those little pumps are Not safe for large chambers and for pressures higher than 28 bar. Thats why they say "do not go over 28 bar" on the package.
Build yourself a stirrup pump... you'll get higher pressure, more volume and more durability from it.
how do you make a stirrup pump?
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Unread postAuthor: jackssmirkingrevenge » Fri May 20, 2011 12:22 am

If you're feeling creative you can spring-load the ball valve with a bit of effort.

Image

The above design is for a semi-auto repeater, if you reverse the spring and trigger dynamics you can make a single shot fast valve.
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Unread postAuthor: streetfire » Fri May 20, 2011 2:24 am

jackssmirkingrevenge wrote:If you're feeling creative you can spring-load the ball valve with a bit of effort.

Image

The above design is for a semi-auto repeater, if you reverse the spring and trigger dynamics you can make a single shot fast valve.

thanks for te pic but i know how to make it spring loaded its just that my new project with a qev is already under way so i didn't put much more effort in it
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