# Thread: Air vortex thoughts / ramblings of the uneducated

1. Hey guys, came here looking for help in a subject that i cant seem to pin down.
i am a bit of a science novice but i do tend to get the principle behind it, im just struggling to find something that is a simple answer

basically i will be building a costume in the next year, which involves cannons on the back, ( its a science fiction costume )
now obviously these cannot be real but the thought of them firing something harmless came to mind.

my thoughts drifted to air " Vortices",

I have seen few TV shows build giant gas/ explosive mix cannons, which obviously i do not require, and i have had a go doing the whole "box " with hole cut in it.

there are also commercial versions but these may be a little too small for my liking, (even though i may use the smoke generators inside)

the basic draft is a tube around six inches in diameter, possibly about 30 inches in length, a small smoke machine in the front, inside there will be piston which is the diameter of the tube attached to a geared rack and half gear much like a soft air gun. i am looking at around 10-20ft distance, more is better as it will be on stage.

as a first hurdle, as far as i can tell, shape is pretty much irrelevant i assume?

after that, what would be more important? the volume of the tube before the pressure wave exits, (could this have a detrimental effect if it was too long?) or the is it more dependent on the velocity of the pressurewave " inside?

also i read somewhere before coming here that the more "agitation " using baffles inside the tube, the better, is this correct?

thank you if anyone can help,

have never been good at simple math, let alone this level of fluid dynamics.

2.

3. Can you elaborate a bit on the effect you want to achieve? Will this be firing some harmless projectile like a nerf ball, or just a puff of smoke? Is it just one shot, or do you need a repeater? Should it make a sound of any kind?

4. it is literally a vortex of air, the smoke gets entrapped in it and allows it to be seen ( i tried posting a video of the toy but it denied me ) as for sounds and repeatability i am pretty good with that side of things , its more the "scaling " of the air vortex,

there is a company who make a toy called Zero Blaster Vapor Vortex Generator ,( Google ) this is basically what i am referencing off, i just am not sure about the scaling of the math behind it that can be altered.

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