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.
Posted: Tue May 08, 2012 12:02 pm
by al-xg
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.
Posted: Tue May 08, 2012 12:04 pm
by warhead052
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.
Posted: Tue May 08, 2012 12:04 pm
by jackssmirkingrevenge
al-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
Of course, I thought I had forgotten something
Posted: Tue May 08, 2012 3:25 pm
by Brian the brain
Just cheesecake the front section and your fine.
Posted: Tue May 08, 2012 5:22 pm
by mattyzip77
Seriously, that thing is totally fuking awesome!!!
Posted: Tue May 08, 2012 11:55 pm
by jakethebeast
aaah, this is what you came up with, looks nice Like a little mosquito
Posted: Wed May 09, 2012 12:13 am
by jackssmirkingrevenge
hehe imagine two of these strapped together, with a blade in between...
Posted: Wed May 09, 2012 1:17 am
by HunterT
jackssmirkingrevenge wrote:hehe imagine two of these strapped together, with a blade in between...
that would make even the "saltiest" Spetsnaz troops fap...
Posted: Wed May 09, 2012 1:43 am
by jackssmirkingrevenge
HunterT wrote:that would make even the "saltiest" Spetsnaz troops fap...
... making them even saltier!
Posted: Wed May 09, 2012 2:03 am
by HunterT
jackssmirkingrevenge wrote:
HunterT wrote:that would make even the "saltiest" Spetsnaz troops fap...
Like a little mosquito 