Just thinking aloud here, I'm contemplating a new knife project, not a ballistic knife though which fires off its own blade (painful if you have a jakethebeast<sup>TM</sup> quality blade...) but rather one which incorporates a projectile firing device in the handle.
Something like this beast:
[youtube][/youtube]
... but more compact and definitely not as loud. The design is conceptually identical tothis one.
I calculated 0.4 grams for the delrin pusher piston, at less than 250 fps it should survive the impact at the end of its travel.
The vent could be closed off with a screw to reduce air loss to zero.
silent valveless HPA dart launcher
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jackssmirkingrevenge
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hectmarr wrote:You have to make many weapons, because this field is long and short life
I'd have some sort of vent ahead of the O-ring in extended position, so even if you don't want the propellant volume to leak out, the air in front of the piston wouldn't dampen the initial acceleration too much. But you could still trap some air at the end to cushion the piston impact.
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warhead052
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Ohhh pretty! This is pretty much along the same lines of your ballistic knife though, so it should work. The only thing I see going wrong is air compressing past the vent you put in. Unless you can stop the piston just before the vent, its gonna compress the air and possibly mess with the dart's flight. Other than that it looks like it will work.
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jackssmirkingrevenge
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Of course, I thought I had forgotten somethingal-xg wrote:I'd have some sort of vent ahead of the O-ring in extended position, so even if you don't want the propellant volume to leak out, the air in front of the piston wouldn't dampen the initial acceleration too much
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Brian the brain
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Just cheesecake the front section and your fine.
Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!
Can't ask for a better compliment!!
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!
Can't ask for a better compliment!!
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mattyzip77
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Seriously, that thing is totally fuking awesome!!!
Go Bruins!!!!
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jakethebeast
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aaah, this is what you came up with, looks nice 
Like a little mosquito 
Like a little mosquito Est Sularus Oth Mithas
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jackssmirkingrevenge
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hehe imagine two of these strapped together, with a blade in between...
hectmarr wrote:You have to make many weapons, because this field is long and short life
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jackssmirkingrevenge
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... making them even saltier!HunterT wrote:that would make even the "saltiest" Spetsnaz troops fap...
hectmarr wrote:You have to make many weapons, because this field is long and short life