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High pressure gun --> silencer video update

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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Unread postAuthor: MRR » Sun May 03, 2009 1:05 pm

I like that gun so much at the moment that I added a breach load that was reserved for one of my bigger guns.

Well, looks bad ass....
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Close up of the breach. I will also add a handle.
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Unread postAuthor: CpTn_lAw » Sun May 03, 2009 1:10 pm

Niceee :D

Any guess on the average muzzle velocity ?
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Unread postAuthor: MRR » Sun May 03, 2009 1:17 pm

Nope, I was so busy building that i didn't test the performance with silencer and now it's getting dark outside :cry: .
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Unread postAuthor: c11man » Sun May 03, 2009 4:31 pm

why cant the sun rise faster? anyway i cant wait till we get some preformace numbers from this beast
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Unread postAuthor: daniel323 » Sun May 03, 2009 5:55 pm

that gun looks amazing and powerful great build.
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Unread postAuthor: MRR » Mon May 04, 2009 9:35 am

Made some test shots and the results were not disappointing but also not as good as i expected.

I simply build too fast.... I have multiple leaks (noticeable at 200psi +) and the breach load doesn't seal 100%. :cry:

I'm going to disassemble the gun an try again.
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Unread postAuthor: Gaderelguitarist » Mon May 04, 2009 10:22 pm

MRR wrote:Made some test shots and the results were not disappointing but also not as good as i expected.

I simply build too fast.... I have multiple leaks (noticeable at 200psi +) and the breach load doesn't seal 100%. :cry:

I'm going to disassemble the gun an try again.


Slap on a couple more layers of Teflon tape and really crank those fittings together.

For the breach, maybe try a sealing gasket that makes a seal when you close the bolt.
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Unread postAuthor: MRR » Wed May 06, 2009 11:48 am

I've found the problem...
The hose barb that the piston seals against is screwed "upside down" so I had to wrap the teflon tape in the other direction (forgot about that).

I made a test shot at 245psi on a 3cm wooden board (5" nail) and it went right through. :twisted:
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Unread postAuthor: MRR » Mon May 11, 2009 1:41 pm

Here is a little video footage i shot at the weekend.

Yes I know the garden is a mess at the moment.
I've found the music on jamendo.com ... sounds like Kung-Fu somehow :D

[youtube]http://www.youtube.com/watch?v=SP5adMMIFXw[/youtube]
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Unread postAuthor: jackssmirkingrevenge » Mon May 11, 2009 2:12 pm

Nice :) could the aiming fail be coming from the fact that you weren't shooting from rest?

Try resting the launcher on a bench or something and try shooting a group of 5-10 shots, with the laser attached and always pointing at the same spot - see if it groups at random.
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Unread postAuthor: MRR » Mon May 11, 2009 2:19 pm

I will try that but the biggest problem in my opinion is the alignment of laser and barrel (just zip tied it)
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Unread postAuthor: ALIHISGREAT » Mon May 11, 2009 2:26 pm

I love damage vids, be sure to keep the coming!
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Unread postAuthor: jackssmirkingrevenge » Mon May 11, 2009 2:26 pm

Why not buy a proper laser, they're not that expensive.
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Unread postAuthor: paaiyan » Mon May 11, 2009 2:28 pm

Well jack's idea is the best thing either way. If it's random groupings you need to probably find better ammo. If your groupings are tight then it's just a matter of adjusting your laser to compensate for it.
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Unread postAuthor: MRR » Mon May 11, 2009 2:38 pm

The darts are ok and very accurate at short distance.

@jsr
I bought this cheap laser to disassemble it and give it a new housing/switch that fit the gun. I'd rather build than buy something.
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