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pneumatic spearguns...

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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pneumatic spearguns...

Unread postAuthor: jackssmirkingrevenge » Fri Aug 17, 2012 2:19 pm

... are actually valveless single stroke captive piston pneumatics!

This was news to me.

No need for an external air supply, push in the spear compressing the air until the trigger sear locks et voila.
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Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 2:42 pm

Interesting, I once considered building valve based on this.
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 17, 2012 3:31 pm

Essentially similar tothis concept, except it doesn't rely on external air and uses a piston pusher that doesn't actually leave the barrel.
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Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 3:38 pm

Are you planning on building this? BTW you always supply us with links, and what you link us to tends to have more links Ect. and in the end I spend about an hour going through all these links :lol: Thanks
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Unread postAuthor: MRR » Fri Aug 17, 2012 3:55 pm

I think this design could be improved with a balanced piston. There is too much stress on the trigger mechanism in my opinion.
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Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 4:00 pm

What does the water go in for anyway?
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Unread postAuthor: mattyzip77 » Fri Aug 17, 2012 4:07 pm

SPEARCHUCKER!!!!!! :lol:
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Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 4:11 pm

Actually this would make an epic handheld air cann - er... not air cannon but uh... weapon thingy. Wait, these are already mass produced aren't they.
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 17, 2012 4:13 pm

MRR wrote:I think this design could be improved with a balanced piston. There is too much stress on the trigger mechanism in my opinion.


Could be done, but how much pressure can you really generate with a single stroke, it's not *that* stressed.

What does the water go in for anyway?


... because you're underwater?

You can't leave that part full of air, because it will resist the motion of the piston. Of course water does this too but it is incompressible so it is simply being forced out.

Found the diagram on a website suggesting a "dry" barrel, where the space in front of the piston is evacuated:

Image

If they really wanted to increase power significantly though, it's easier to just stick on a schrader valve and pump a few extra psi.

*gasp* have I just suggested MOAR POWER! over better efficiency?!
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Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 4:37 pm

Oh, I didn't think about that part.
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Unread postAuthor: silentkill12345 » Sat Aug 18, 2012 1:32 am

looks verry intresting :) want to see one in action
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