issue is to leave no evidence such as yr dna/fingerprints behind? hmm..

1. use water gun, but instead of normal water u use deadly poison which as soon as it touches the skin, dead!

2. use metal bullet. but instead of it going in a piece, make it :

2.1 so hot that it penetrate the skin
2.2 make it disperse .. but the bullet disperse as soon as it touches object..and the bullet better be sharp..
got it?

who mentioned about leaving fingerprints or dna behind???
a person shot by a gun would leave behind a dead body with or without the bullet in it, plus bullet wound.


hmm so far nothing that deadly to cause instant death.



isn't the purpose of bullet is to penetrate? how does temperature affect it? plus the bullet can still be traced back to the gun that fired it.

to avoid tracking, use the bullet that dispersed .. into smaller bits that's impssible to track.

There's isn't such a substance known as 'deadly poison'. Poison kills because u consume it or comes into ur body, not touches, neurotoxins is the cloeset thing. The worst thing you can get is highly corrosive material that will not kill but burn you.

Bullets are already hot as soon as it exist the gun as it absorbs thermal energy from the combustion.

U meant fragments? Something like shotgun? If it's so fragile that it breaks into fragments as soon as it hits, then it wouldn't be very much lethal

Do you even know what is disperse? >_>

Impossible to track? Do you have any idea how sensitive today's instrument is? Metal for instance can be easily track by using AAS even at mmolar range. Some other inorganic qualitative test using chemicals is already sufficient to detect it.

So u might say, so what if they detect metals? It could be something else.

Okay then electron microscope, giving magnification of up to 1000x of your naked eye.

This post has been edited by NicJolin: Mar 24 2010, 08:55 PM

if u put metal ball inside the ice.. and during the firing wouldn't da heat generated melt the ice.. railgun used megawatt, imagine the heat produce by it

to project water at such speed of destruction is probably conceivable with at least 10,000psi. that too you need a big pump to generate enough pressure to do so with current technology.

perhaps lazer projector that does as well as bullets would be a much better option.

heat from railgun can be negated by the system, but still pumping in mega amps isnt easy.
, another way is actually a system that can launch a bullet or something way up into the air and acts like an artillery.

put seriously laser isnt a bad idea, a very super efficient reflector can do the job of focusing and killing.

as have mentioned earlier why water would make a better alternative because it leaves no trace behind. laser is definitely the best at doing just that. and also no recoils to render the accuracy of the shot too.

Isn't this going off topic?
The original question is how to make a gun that fires "water" as ammo.
"How do you propel water with the same destructive velocity of a bullet?"
Nothing about leaving no evidence of the shooter whatsoever.

thanks for the pointer. why not you do the job rerail back the topic?

Because I believe the answer lies more in the area of mechanical, thermodynamics and chemistry non of which is my area of expertise.
But here's my general idea,
1. To send any projectile over any distance and having the same destructive velocity of bullets over the air requires the projectile to have some kind of stable mass. Water is liquid form doesn't seems plausible to me so I would go with ice, or would superheated plasma and/or ionized form has any uses? Just wild guess here.

2. The idea is to propel the "ammo" to very high velocity. Common guns uses gunpowder to generate the explosive pressure required. Note that heat in this case is simply a side effect. So either we shield the "ammo" from the heat, or look for other mechanism to generate the required pressure. Compressed air, jets of water, or would repelling magnetic force, power requirement aside, all sounds plausible.

Rail gun sounds like a good choice, except pure ice is a very poor electricity conductor. So perhaps mixing it with the appropriate amount of chemical ions and it would work.

Ice might work, but not pure water. Ice that added with solutes, something like an organic thickener and electrolytes could enhances its resistance to the thermal energy and increases its melting point and boiling point. The chamber which the combustion take place should be lowered in terms of pressure, as this could lower the tendency of ice turning into water. Remember, water is denser than ice.

I think the keypoint is to ensure that the ice stays intact the moment it leaves the chamber.

This post has been edited by NicJolin: Mar 27 2010, 11:51 PM