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Labtecpowers (soon-to-be) quick dump valve cannon

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: Gaderelguitarist » Fri Feb 04, 2011 4:56 pm

This is really starting to look nice.

Whats to stop you from putting a spring and a sear on the firing knob to actuate this with more of a conventional trigger?
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Unread postAuthor: Labtecpower » Sat Feb 05, 2011 1:12 am

I've been thinking about it. In that way it would be more like a bazooka.

I first want to be sure it works well, than I might put a firing system on :D
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Unread postAuthor: Gaderelguitarist » Sat Feb 05, 2011 12:17 pm

Or even a giant rifle like setup, provided you put a stock on it. More work than necessary, but it's always nice to kick these things up to the next level.
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Unread postAuthor: Brian the brain » Mon Feb 07, 2011 3:55 pm

Minigun set up has always appealed to me.
Grips on top and fire it from the hip...
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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!!
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Unread postAuthor: Labtecpower » Tue Feb 08, 2011 9:03 am

hmmm... minigun is the way to go I think.

I started drilling in the gas tank (it was ventilated first :D)
But the smell coming out of it was horrible. I think when i'm done, i'll clean it up with soap

I made a complete hole in the top of the tank.
I took a sniff, and I almost started puking :?
Now I try to remove the smell. Anyone has an idea?
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Unread postAuthor: Crna Legija » Tue Feb 08, 2011 10:49 am

you could try light a match :lol:
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 08, 2011 10:50 am

Brian the brain wrote:Minigun set up has always appealed to me.
Grips on top and fire it from the hip...


Oh yeah, Mossberg 500 "chainsaw" style :D

Image

Now I try to remove the smell. Anyone has an idea?


Match :)

but it will probably dissipate after a few firings.

edit: damn, beaten to it!
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 08, 2011 10:51 am

double post... damn connection.
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Last edited by jackssmirkingrevenge on Tue Feb 08, 2011 11:04 am, edited 1 time in total.
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Unread postAuthor: Technician1002 » Tue Feb 08, 2011 11:01 am

Labtecpower wrote:I took a sniff, and I almost started puking :?
Now I try to remove the smell. Anyone has an idea?


Warm soapy water to cut the oils, followed by a hot rinse and dry quicky to prevent rust.
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Unread postAuthor: Labtecpower » Tue Feb 08, 2011 11:43 am

I cleaned the tank with warm water and soap. The smell isn't that bad anymore.
I'm thinking of burning the residues by putting rubbing alcohol in the tank, and then lighting it.

@jsr:
That one is VERY cool! definately putting a chainsaw handle on, if I get the chance!
If i do so, I want it to be in the centre of gravity.

Also,

I ran a model of the QDV trough a very crude physics simulator.

Here are the pictures;

Image

Image
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Unread postAuthor: Technician1002 » Tue Feb 08, 2011 1:24 pm

Very nice. Can you round the corners of the end of the barrel slightly? I rounded the ports edges to both save the o rings from cuts and to reduce the edge drag.

I really like the wave front entering the barrel in the first photo. In reality, the opening time of the valve will not permit that sharp of a wave front in the barrel.

In comparison, how does this compare to a sprinkler valve? I suspect it flows much better from what I have seen. The bends internal to a sprinkler valve will not be friendly to that flow.
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Unread postAuthor: Labtecpower » Tue Feb 08, 2011 2:31 pm

I modelled a very simple sprinkler valve for you.
The flow is very turbulent to say the least.

It isn't very refined, but it will give an idea :wink:

Image

Image



And, about the rounded corners: the program can't model very fine edges.


I also burned the chamber with alcohol. The smell is completely gone :)
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Unread postAuthor: Crna Legija » Tue Feb 08, 2011 10:09 pm

whats the program called? and can you try make a barrel sealer?
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Unread postAuthor: Gaderelguitarist » Tue Feb 08, 2011 10:32 pm

So how long until the tank is welded on?

How big is the tank by the way? I'm thinking along the lines of Tech's QDV cannons where he has a propane tank serving as the chamber.
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Unread postAuthor: Labtecpower » Wed Feb 09, 2011 2:41 am

Here's your barrel sealer

Image

The tank will be welded when I have time for it. I first have to make the hole in the bottom of the tank :wink:
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Last edited by Labtecpower on Sun Feb 13, 2011 2:27 pm, edited 1 time in total.
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