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Wanted

ijusam

Regular Member
Joined
Mar 24, 2007
Messages
322
Location
Kent county, Delaware, USA
imported post

Wynder wrote:
Looks like a decent flick -- good gun porn in the trailer; however, what do you think... can you put a 'curve' on a bullet?

http://movies.yahoo.com/movie/1809878244/video/4771511/standardformat/;_ylt=Aq_Q0cuvGDQdMyy3KFK90ShfVXcA

Wynder wrote: what do you think... can you put a 'curve' on a bullet?

Yes, you can put a curve on a bullet. Can you make this shot? I can’t, but wont say it can’t be done.

Projectile Drift.

  1. Projectile Drift:When viewed from the rear, most projectiles spin in a clockwise direction. Spinning projectiles act like a gyroscope and exhibit gyroscopic precession. This effect causes the projectile to move to the right, which is called the horizontal plane gyroscopic effect. As the range to target increases, projectile drift increases
(2) Wind Drift. The effect of wind on a projectile in flight is called wind drift. The amount of drift depends on the projectile's time of flight and the wind speed acting on the cross-sectional area of the projectile. Time of flight depends on the range to the target and the average velocity of the projectile. When firing into a crosswind, the gunner must aim upwind so that the wind drifts the projectile back to the target.

(3) Angular rate error. is caused by the motion of the barrel as the projectile leaves the weapon. The amount of error induced depends on the range to the target, the rate of motion.

(4) Trajectory shift. When the boreline axis of the weapon differs from the motion of the vehicle, the movement of the vehicle changes the trajectory of the projectile. For off-axis shots within ±90 degrees of the vehicle’s heading, trajectory shift causes the round to hit left or right of the target. To correct for trajectory shift, the gunner leads the target.

All of these ( and more) can put a curve on a bullet. Of course they compound, so the more factors and more severe the conditions, result in greater induced error. A good shooter can use these known and calculated factors to achieve better results and even make "impossible" hits. A skeet shooter uses the angular rate error to spread his shot pattern more horizontally thus increasing his chances of a hit.

In this clip, it seems the factors involved are projectile drift and angular rate error. At this range projectile drift would not be noticeable. As for angular rate error; I wouldn’t be able to calculate. It would depend on the rate of arc, barrel length, muzzle velocity, projectile size and weight, time of flight, ect. Of course barrel misalignment could also be a factor if it was held gangsta style with sights to the right.

Ballistics make my head hurt!
 

openryan

State Researcher
Joined
Apr 18, 2007
Messages
1,602
Location
, Indiana, USA
imported post

Movie looks pretty cool, I would like to see it, although probably on DVD if I still remember then, I am not one for going to theaters and shelling out 30 bucks for 1 and a half hours of entertainment unless it is something that really, really catches my interest.

And yes, I can put a curve on a bullet, as well as a change-up :)
 

Thundar

Regular Member
Joined
Sep 12, 2007
Messages
4,946
Location
Newport News, Virginia, USA
imported post

ijusam wrote:
Wynder wrote:
Looks like a decent flick -- good gun porn in the trailer; however, what do you think... can you put a 'curve' on a bullet?

http://movies.yahoo.com/movie/1809878244/video/4771511/standardformat/;_ylt=Aq_Q0cuvGDQdMyy3KFK90ShfVXcA

Wynder wrote: what do you think... can you put a 'curve' on a bullet?

Yes, you can put a curve on a bullet. Can you make this shot? I can’t, but wont say it can’t be done.

Projectile Drift.

  1. Projectile Drift:When viewed from the rear, most projectiles spin in a clockwise direction. Spinning projectiles act like a gyroscope and exhibit gyroscopic precession. This effect causes the projectile to move to the right, which is called the horizontal plane gyroscopic effect. As the range to target increases, projectile drift increases
(2) Wind Drift. The effect of wind on a projectile in flight is called wind drift. The amount of drift depends on the projectile's time of flight and the wind speed acting on the cross-sectional area of the projectile. Time of flight depends on the range to the target and the average velocity of the projectile. When firing into a crosswind, the gunner must aim upwind so that the wind drifts the projectile back to the target.

(3) Angular rate error. is caused by the motion of the barrel as the projectile leaves the weapon. The amount of error induced depends on the range to the target, the rate of motion.

(4) Trajectory shift. When the boreline axis of the weapon differs from the motion of the vehicle, the movement of the vehicle changes the trajectory of the projectile. For off-axis shots within ±90 degrees of the vehicle’s heading, trajectory shift causes the round to hit left or right of the target. To correct for trajectory shift, the gunner leads the target.

All of these ( and more) can put a curve on a bullet. Of course they compound, so the more factors and more severe the conditions, result in greater induced error. A good shooter can use these known and calculated factors to achieve better results and even make "impossible" hits. A skeet shooter uses the angular rate error to spread his shot pattern more horizontally thus increasing his chances of a hit.

In this clip, it seems the factors involved are projectile drift and angular rate error. At this range projectile drift would not be noticeable. As for angular rate error; I wouldn’t be able to calculate. It would depend on the rate of arc, barrel length, muzzle velocity, projectile size and weight, time of flight, ect. Of course barrel misalignment could also be a factor if it was held gangsta style with sights to the right.

Ballistics make my head hurt!

I guess it really depends on your definition of curve. As a bullet travels downrange the effect of gravity can be seen on the bullets trajectory. The bullet is curving toward the earth. So, in a way, all bullets curve:p
 
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