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The Sneezer

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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The Sneezer

Unread postAuthor: EnigmaMax » Fri Jul 08, 2011 4:28 pm

Before I begin, this cannon was inspired by this. Seeing as it is a very rare antique,
I thought instead of hunting for one, it would be more practical to build one.
Plus, this gun was practically free, all the parts were either lying around the house
or scraped from previous projects.

Image

I'm pretty sure this is classified as an elastic compressed dart gun. It uses
high strength surgical tubing to plunge a bike pump, which is rigged to a barrel.
It is triggered by a ball valve, which pinches the piston when closed.
When the valve is opened, the plunger quickly sinks, shoots air through the barrel,
and sticks a dart into whatever was on the business end.

Image

I used several hose clamps to secure a caulking gun to the bottom,
which now serves as a stirrup, and an anchor for the tubing.

Image

Also, I rigged a PVC construction to the gun, so the barrel can slide in and out, and be loaded from the breach.

Image

Overall, this thing is pretty powerful. It sinks darts at least 1/2" in wood.
I think if I add more bands, I can get >800 fps velocities.

Image

Accuracy is...flawed, but not impossible.
The sudden lunge of the plunger makes this feel more like a shotgun than an airgun.
Plus, I don't have any sights right now, but I think I can mold some from epoxy.
Nevertheless, I almost killed a very dodgy spider with it. :evil:

Image
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Last edited by EnigmaMax on Fri Jul 08, 2011 4:46 pm, edited 1 time in total.
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Unread postAuthor: streetfire » Fri Jul 08, 2011 4:32 pm

again was too late on the other

cool gun so its a pull back and fire kind of gun? should be pretty fast to fire like the concept of no pumping
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Unread postAuthor: EnigmaMax » Fri Jul 08, 2011 4:35 pm

You hit the nail on the head. It's still kinda slow, but it beats lugging around an air compressor.
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Unread postAuthor: Ragnarok » Fri Jul 08, 2011 5:21 pm

With a name like that, I was assuming it would be based on this...
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: 3VIL G3NIUS » Fri Jul 08, 2011 6:40 pm

I don't think your meant to talk about shooting at living things, a spider is a living thing.
Pretty cool concept though.
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Unread postAuthor: LeMaudit » Fri Jul 08, 2011 6:54 pm

More ghetto than that... and you have to be a zombie yourself to use it :shock: :D

now why am I so intrigued by ghetto looking stuff suddenly....

I like the look. Video + damage?

And I'm even more intrigued by this inspiration you had, this old gun is pretty weird... so is it's patent... never saw anything like that before! :shock:
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I HAZ A BANG!
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Unread postAuthor: EnigmaMax » Fri Jul 08, 2011 7:26 pm

I'll try to get video up, but it won't have sound :(
I guess you'll have to imagine a very loud sneeze when it fires!

...also, sorry the spider, I hate them so much, I didn't think it of it being offensive. It's still very much alive, due to my shoddy aiming :cussing:
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Unread postAuthor: jackssmirkingrevenge » Fri Jul 08, 2011 8:45 pm

Wow. I'm amazed it works at all :D

You should try a proper pneumatic, the darts will go much deeper even with a basic valve and relatively low pressure.

LeMaudit wrote:now why am I so intrigued by ghetto looking stuff suddenly....


:shock:

Also.

Image

And I'm even more intrigued by this inspiration you had, this old gun is pretty weird...


Pretty inefficient too:
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