Samurai Sword vs 9mm

[rayesyn]

one cool video:

http://video.google.ca/videoplay?docid=-3818187790122256202

[nano]

Whoa!

[najibs]

Whoa!

So if I ever get a gun pulled on me, I'll just whip out my samurai sword, and I'll be safe.

[buddhaboy12]

So if I ever get a gun pulled on me, I'll just whip out my samurai sword, and I'll be safe.

Not necessarily... rather than getting shot once, the bullet splits into 2. So you get shot twice :cheesygri

[nahim.a.a]

In old times it was a custom to 'test' a newly build Samurai sword for the nobility on a prisoner who was going to be executed. Even today its common practice to test the sword on a life pig.

[bottomfeeder]

No biggie.

The sword has a width cross-section of 3 inches and razor sharp edge

The bullet was just a lead bullet - with no copper jacket - very soft.

Think of it this way - you think that the bullet should do more damage because it is travelling fast... but that does not matter. Imagine the following - what do you think would happen if the soft lead bullet was stationary and the sword moving at 500 meters per second? Do you think the sword would cut through the bullet? The sword and the bullet meet at 500 meters per second - it does not really matter which one is moving. but I could be wrong - can anyone disprove?

[rayesyn]

good analysis bottomfeeder, sorry i can't disprove you. i'm still amazed by that video.

No biggie.

The sword has a width cross-section of 3 inches and razor sharp edge

The bullet was just a lead bullet - with no copper jacket - very soft.

Think of it this way - you think that the bullet should do more damage because it is travelling fast... but that does not matter. Imagine the following - what do you think would happen if the soft lead bullet was stationary and the sword moving at 500 meters per second? Do you think the sword would cut through the bullet? The sword and the bullet meet at 500 meters per second - it does not really matter which one is moving. but I could be wrong - can anyone disprove?

[corrupt123]

Another reason I want to learn Kendo.

Unfortunately though, in todays society, especially our North American one, you'd have three pounds of lead inside you before you unsheathed the sword :(

[veryhuman]

the same show did this w/ a bigger machine gun. the sword got owned.

[vrus]

I heard tupac got shot .

[elusion]

crazy

[Brownbear]

I heard tupac got shot .

what a lame thing to say...

cool video btw.

[MizTEcK]

Repost

[ian1386]

Think of it this way - you think that the bullet should do more damage because it is travelling fast... but that does not matter. Imagine the following - what do you think would happen if the soft lead bullet was stationary and the sword moving at 500 meters per second? Do you think the sword would cut through the bullet? The sword and the bullet meet at 500 meters per second - it does not really matter which one is moving. but I could be wrong - can anyone disprove?

not sure what you're talking about, since I haven't watched the movie yet, but a bullet going at 500m/s is much different than a sword going 500m/s, reason being is that the inertia of the sword is MUCH more since it has more mass. If the sword is 1000 times heavier than the bullet, then it would take 1000 times the force/resistance to stop it in the same amount of time as the bullet.

[eelfliw]

In the beginning of the video they shows a concrete block being split in half by the bullet.....

Would be interesting to see what happens to the sword if the concret block was fired at the sword at the same speed as the bullet.

[nano]

So if I ever get a gun pulled on me, I'll just whip out my samurai sword, and I'll be safe.
we cant let this video out soon you will see thugs walking around with swords

[Valek]

http://youtube.com/watch?v=vdF9k0HVn7E&search=katana%20vs%20machine

Gun for the win. :P

[corrupt123]

http://youtube.com/watch?v=vdF9k0HVn7E&search=katana%20vs%20machine

Gun for the win. :P

It took 7 bullets to finally break it. Thats pretty damn tough IMO.

[yuwing8]

it doesn't matter in the end.. person who yeilds the sword still die :|

[P__S__2]

Cool, but I'd pick the gun over the sword any day.

[Rometiklan]

The pen is mightier than the sword, and now so is the gun. The sword is getting a bad rap.

[mattpiloto]

What would be really cool is if you could pull a jedi trick and actually stop a bullet with a sword without having them all clamped nicely in place.

[felixdd]

not sure what you're talking about, since I haven't watched the movie yet, but a bullet going at 500m/s is much different than a sword going 500m/s, reason being is that the inertia of the sword is MUCH more since it has more mass. If the sword is 1000 times heavier than the bullet, then it would take 1000 times the force/resistance to stop it in the same amount of time as the bullet.

First of all, I think you mean to say "momentum" and not "inertia".

Nonetheless, the concept of momentum is still relevant, and that you're theoretically correct in saying that the bullet going at the knife at 500 m/s is different than the knife going at the bullet at 500 m/s.

Consider an analogy ad extremum: throwing a large (1 cubic meter) sponge at a machete such that, at the moment of impact with the edge, it is traveling at a measly 5 m/s. Since the sponge is very light, it takes very little force to stop the sponge -- and this includes friction. All this means that the sponge will not suffer a very deep cut.

Now twist it the other way around, and chuck the machete at the sponge. Even at 5 m/s, the heavy knife will carry enough kinetic energy to considerably penetrate the sponge.

So yes, in theory, bottomfeeder's logic is flawed. However, given that we're talking about a ball of lead here, and also talking about slicing cleanly through the bullet at high speeds, his model is definitely "good enough".

[Peckerwood]

It is not a 9mm.

The gun being used is a 1911A1 in 45ACP...the projectile is more than likely copper jacketed and wouldn't matter if it was or wasn't. It's velocity is only around 900fps or 274m/s...grain weight is 230grains or 15 grams...energy is approximately 413ft/lbs

Also consider that in the second video they are using a 50bmg which is a huge catridge...the bullet wieghs about 700 grains minimum and carries 13,000 ft/lbs of energy...it is also copper jacketed.

[edit] Added for comparison:
9mm Luger next to a 50BMG(12.7x99mm)
http://usera.imagecave.com/peckerwood2/127_99_01.jpg

9mm Luger next to a 45ACP
http://usera.imagecave.com/peckerwood2/45acp_02.jpg

Various assorted cartridges..9mm Luger is 3rd from the left...45acp is 5th from the left...50bmg is last on the right...Kudos to anyone who can guess them all :D
http://usera.imagecave.com/peckerwood2/ammo.jpg

[mbg]

So if I ever get a gun pulled on me, I'll just whip out my samurai sword, and I'll be safe.

At least you can never be charged with carrying a concealed weapon with a samurai sword.

[eelfliw]

At least you can never be charged with carrying a concealed weapon with a samurai sword.
Hey, what's that long, hard thing in your pants?

[AzN_RiverdaleCI]

So if I ever get a gun pulled on me, I'll just whip out my samurai sword, and I'll be safe.

lol

[Peckerwood]

Those that live by the sword get shot by those who do not ;)

[Punky]

Hey, what's that long, hard thing in your pants?

:lol:

[nfnx]

lol damn man... that shows teh force of a machine gun... would not want to be raped by one of those .... dang..