New super gun

[Tallas]

http://upi.com/SecurityTerrorism/view.p ... 0112-5273r

Next month a new high-explosive munition will be fired in Singapore and then tested again by the U.S. Army, heralding what may be a sea change in weaponry: a family of guns that can fire at speeds of up to 240,000 rounds per minute, albeit in short bursts.

[Ddrak]

http://www.metalstorm.com/

The gun has been operational since the late 90's (at least that's when I saw it demoed on Aussie TV). It's only taken 8 years to get serious military interest...

Dd

[Kula]

Did you happen to watch the Mythbusters episode where the tested the theory of how much water can protect you from a bullet? All of the most powerful guns bullets basically disintegrated when they hit water. 3 feet of water can protect you from a .50 cal.

[UltraBurz]

Don't think we want to send the army around with 3 feet thick water tubes around their bodies though

[Ddrak]

Metal Storm will blow straight through 3 feet of water, and most armor plating as well. The rate of fire means that single bullet tests are worthless.

Dd

[Nikore]

Yeah I agree with you ddrak, i saw that Mythbusters and all they did was take a big rifle and shoot it in too the water. It does not take in too account the rate of fire or how many bullets are being fired at once. Besides if you rember, in that same show they tryed a shot gun which comptely distroyed the test equpment and the target. So yeah 3 feet of water might protect you from a 50cal Dester egal but it seems it wont stop a shot gun or some of high powered sub-machine guns we use in warfar today.

Besides when you fight this guy you wont have to worry about the water

[Kula]

What it showed was.....when trying to overcome water resistance a slower bullet words better. The 9mm pistol did very well. The faster the bullet the worse the performance.

Clearly a machine gun will work better because once the first bullet breaks the surface tension......the succeeding bullets will go deeper.

[GINLAAN]

Actually they proved on myth busters that water could and could not stop a bullet. THat test is totally dependent on the angle of fire.

Fire stright down and the water was no match. Fire at a angle and the bullet couldnt go 20 inches before more or less exploding. I believe they fired at a 50 degrea angle if i recall. It would be intersting to find out what the actual angle is when the water stops protecting.

[Averam]

It wasn't a pistol. It was a Browning .50cal rifle. Little bit different.

[Embar Angylwrath]

Actually they proved on myth busters that water could and could not stop a bullet. THat test is totally dependent on the angle of fire.

Fire stright down and the water was no match. Fire at a angle and the bullet couldnt go 20 inches before more or less exploding. I believe they fired at a 50 degrea angle if i recall. It would be intersting to find out what the actual angle is when the water stops protecting.

Angle of fire has little to do with it. Dig out your old high school physics book. Water is a newtonian fluid, and its rheological properties are such that the viscosity of the water is directionally proportional to the stress applied to it. In other words, the harder you hit water, the harder it hits back.

So, the higher the velocity per given mass, the more force per given mass (F=ma). The more force applied to the water by the ballistic mass the more force the ballistic mass has to deal with itself. This is why faster bullets shatter more easily when they hit the water, as they are dealing with higher levels of force than slower bullets.

Also, there is the factor of concentration of force too. If you fire a single ballistic mass into water, whatever force the ballistic mass has to absorb is concentrated on the tip of the bullet. This is the principle that causes hollow points to flatten and expand. With shotgun shells, the force of impact is distributed over a larger surface area, thus allowing the shot retain integrity. The slower velocity of shotgun loads also allow for deeper penetration by the shot, since there is less force of viscosity to overcome.

[Ddrak]

Water is a newtonian fluid, and its rheological properties are such that the viscosity of the water is directionally proportional to the stress applied to it.

I think you mean "resistance to shear stress", not "viscosity". The definition of a newtonian fluid is that the viscosity is independant of stress applied.

Nomenclature aside, the rest of your statement was accurate.

Dd

[Embar Angylwrath]

Water is a newtonian fluid, and its rheological properties are such that the viscosity of the water is directionally proportional to the stress applied to it.

I think you mean "resistance to shear stress", not "viscosity". The definition of a newtonian fluid is that the viscosity is independant of stress applied.

Nomenclature aside, the rest of your statement was accurate.

Dd

Viscosity IS the resistance of a fluid to shear stress. That's the non-mathematical definition of viscosity. The higher the force needed to induce shear stress in a fluid, the higher the fluid's viscosity.

I think you may be confusing a nuance or two of fluid dynamics. First, a Newtonian fluid has a viscosity that is independent of the PRESSURE applied to the liquid, not the shear stress. Meaning that, all other things being equal, a glass of water under 14 psi will pour out just as fast as water at 2 psi, or 20,000 psi.

However, we are talking about shear stress, which is completely different from a uniform pressure applied over a fluid. A shear stress applies an uneven amount of force to a fluid's surface (actually, it doesn't have to be at the surface, it works anywhere in a fluid body, but for the purposes of this discussion, we'll keep the visualization to one in context of the thread). The difference between a non-Newtonian and a Newtonian fluid is that in Newtonian fluids, the viscosity changes in direct proportion to the amount of shear stress applied to the fluid. In non-Newtonian fluids, the change in the fluid's viscosity when shear stress is applied is non-proportional. Thixotropic and dilatant fluids are good examples of this phenomenon.

So the "constant" viscosity in Newtonian fluids is a proportional constant. The viscosity will change, but only in direct and proportion to the amount of shear stress applied. More shear stress, more viscosity. Less shear stress, less viscosity.

[Ddrak]

Seriously, in a Newtonian Fluid viscosity is independant of shearing stress. It's properly defined as the ratio of the shearing stress to the velocity gradient. If it varies with shearing stress then the fluid is non-Newtonian.

[Myth1184]

so why would you need a gun that fires 240,000 rounds per minute?

[Ddrak]

To blow the living shit out of anything in front of you?

[Saevrok]

Because when absolutely everything has to die...

[Nikore]

so why would you need a gun that fires 240,000 rounds per minute?

Cleary for deer hunting!

[Lunarstorm]

so why would you need a gun that fires 240,000 rounds per minute?

To compensate for a small penis?

Loon

[Myth1184]

Because when absolutely everything has to die...

Ahh....this should deployed to New Orleans where the blacks are once again looting the town dry. Surprised hasnt heard anything about it on the news lately but local. Cops are just letting them loot too, its sad.

[Saevrok]

Those are niggers Myth, never confuse a black man for a nigger. They are completely different. Dont you watch the boondocks?