i was wondering can you curve a bullet because in this movie the wanted they show that you can

Still no.

No again tomorrow.

Look -->HERE<--

In "Wanted" they curve a bullet, entertaining, but not possible.

Hi,

I have an idea about how to make a bullet curve, however it doesn't need a movement of the shooter's arm for the bullet to curve and the rotation of the bullet will depend on the angle of the barrel rifling.
every bullet is turning because of earth rotation and an aerodynamic effect called magnus effect. but the magnus effect kicks in when the trajectory of the bullet is very long. moreover the gyroscopic effect due to the bullet revolution straiten the trajectory. it's all about a equilibrium of those forces. my idea is to change those forces so the magnus effect become relevant in short trajectory:

the bullet has to be made in a low density alloy shell and a very high density alloy in the core. the core is not in contact with the shell separated by a low viscosity but high lubrication fluid: the idea is to have the shell revolving because of the rifling of the barrel but not the core. the shell will be covered with air guides and the angle of the rifling in the barrel high.
since the majority of the weight of the bullet will be because of the core, the gyroscopic effect will be lower and the magnus effect higher: the bullet may curve easily.

quote:

the idea is to have the shell revolving because of the rifling of the barrel but not the core. the shell will be covered with air guides

good luck with that. Curving a bullet in REALITY with any kind of steady control, or even a real radial arc is not feasible (wind blowing or a bullet tumbling doesn't count). The myth, and the concepts, are busted. IF someone can actually produce reproducable results i may be inclined to change. but it hasn't happened yet and most likely never will (to my knowledge)

yeah it was just a thinking experiment, i totally agree, the myth is busted i was just trying to find a relatively inexpensive way to make a curving bullet. in the case i introduced, i have serious doubts. it's likely the magnus effect wouldn't overcome the momentum of the bullet.

in an other scale, magnus effect is used to straiten airsoft projectile trajectory : the technology is called "hop-up"(r) and make the bullet spin so its trajectory is "less" parabolic.the trajectory is then "curved" to be less curved ^^.

in a bigger scale, some missiles use the gyroscopic effect with a rotating core inside to change trajectories.

so the physics behind this problem is not impossible but apparently impossible to implement in practical use for bullets

Making a bullet curve using the magnus effect would not be difficult, and they definitely have the machining skills to do it.

All you need is a rifle that can fire spherical balls, such as a muzzle-loader. Instead of giving longitudinal rifling along the barrel, you create groves along the one side of the barrel, imparting a lateral spin on the bullet, and a sideways curve.

it's possible, but i was trying to find a way to do it with an round nose bullet, not a spherical one to make it like in the movie. but your point is totally admissible

No,no,no,no,no and NO!!!!!!

People who believes in curving bullets are STUPIDO.... Sorry to be so harsh, but... It's for your own good..

If you curve a bullet you cannot shoot it through a straight barrel.

quote:

Originally posted by CitizenGKar:
No,no,no,no,no and NO!!!!!!

People who believes in curving bullets are STUPIDO.... Sorry to be so harsh, but... It's for your own good..

People who do not believe the magnus effect works on bullets on the other hand are super-geniuses, so smart that they have a physics all their own.

quote:

Originally posted by Nanomyth:
If you curve a bullet you cannot shoot it through a straight barrel.

A spherical bullet fired through a straight, notched barrel would spin. The magnus effect would push the bullet against the notches as it traveled through the barrel. Once the barrel was not there to force it to go straight, the bullet would immediately start to curve.

The Magnus effect cannot curve a bullet as seen in the movie.

The Magnus effect can't swing a bullet around Angelina Jolie and hit the target directly behind her in the space of a few feet.

The Magnus effect can't make a bullet fly in a circular path, killing multiple people on the way, then returning to hit the shooter.

Period. Any claim otherwise is simply moving the goalposts.

quote:

Originally posted by Lokifan:
The Magnus effect cannot curve a bullet as seen in the movie.

I didn't see the movie. I'm just saying the magnus effect can curve a bullet.

quote:

Originally posted by erikmartin:

quote:

Originally posted by Lokifan:
The Magnus effect cannot curve a bullet as seen in the movie.

I didn't see the movie. I'm just saying the magnus effect can curve a bullet.

No, you are DEAD WRONG on that point...

You cannot compare a bullet with a ball.. And that's what you are doing when you are claiming that the Magnus effect affects bullets in the way you are believing it does...

IT DOESNT'T... The spin is there to stabilize the bullets trajectory and see to it that the bullet goes as straight as possible.. It ain't there to make it curve in any way..

If it was, then guns would be able to twist the rifling at will. At the moment there's no other way to do that than to change the bore.

And that is something you won't do in just seconds.. it takes a little more time than that..

quote:

Originally posted by CitizenGKar:

quote:

Originally posted by erikmartin:

I didn't see the movie. I'm just saying the magnus effect can curve a bullet.

No, you are DEAD WRONG on that point...

You cannot compare a bullet with a ball.. And that's what you are doing when you are claiming that the Magnus effect affects bullets in the way you are believing it does...

IT DOESNT'T... The spin is there to stabilize the bullets trajectory and see to it that the bullet goes as straight as possible.. It ain't there to make it curve in any way..

If it was, then guns would be able to twist the rifling at will. At the moment there's no other way to do that than to change the bore.

And that is something you won't do in just seconds.. it takes a little more time than that..

A bullet is not different from a ball, as some bullets ARE balls, and specifically the bullets I am talking about curving are balls.

I never suggested that the longitudinal spin that comes from normal rifling could curve a bullet. The magnus effect from a longitudinal spin is zero.

Changing the bore is exactly what I have suggested every time I have posted on this subject (namely lateral notches along one single side of the barrel, which would impart a lateral spin to a spherical bullet, making it curve in the direction of the notched side of the barrel). Nor have I suggested that the barrel could be bored in seconds.

I wasn't really considering it as a practical combat accessory, just as a novelty. But I suppose you could have a curve-inducing barrel that you could swap out with the regular one when you need to shoot around the enemy's cover. ...if you don't mind shooting ball ammo.