Fox news has a story reporting that the new Army machine gun NG-SAR intended to replace the SAW has the power of a main battle tank, and that is completely wrong. The weapon's chamber pressure is approximately the same as a tank's cannon at around 60-80 K.S.I. yet the volume is tiny comparatively hence the NG-SAR hasn't got anything like the power of a main battle tank at a 'soldier's fingertips' as Fox reported.
It would be good if one could pack the explosive power of a M.B.T shell into a machine gun bullet, yet the machine gun bullet also is substantially smaller than a tank round.
An M-1 uses 105mm and 120mm rounds of four varieties while a SAW uses 5.56mm bullets and the new NG-SAR probably something about 6.8mm Tanks use explosive rounds as well adding more power.
https://www.globalsecurity.org/military/systems/munitions/105t.htm
https://www.thefirearmblog.com/blog/2018/03/05/us-army-calls-next-generation-squad-automatic-rifle-prototypes/
1 k.s.i. = 1000 p.s.i.,
80 k.s.i. = 80,000 p.s.i.
http://www.foxnews.com/tech/2018/07/19/armys-new-machine-gun-will-blast-like-battle-tanks.html
http://video.foxnews.com/v/5811182850001/?#sp=show-clips
A higher chamber pressure increases the exit velocity of a bullet from the barrel of a gun. Gun-powder has volume limits. Probably electric guns have a much greater potential for exit velocity for several reasons comparable to putting one's foot on the accelerator and brake simultaneously before releasing the brake.
In theory one could build a large electric machine gun on the moon and use the Earth as a practice target testing to determine if the bullets could penetrate all the way through and out the other side of that planet. Just kidding. It might be useful as a tool for shooting dangerous asteroids though.
It would be good if one could pack the explosive power of a M.B.T shell into a machine gun bullet, yet the machine gun bullet also is substantially smaller than a tank round.
An M-1 uses 105mm and 120mm rounds of four varieties while a SAW uses 5.56mm bullets and the new NG-SAR probably something about 6.8mm Tanks use explosive rounds as well adding more power.
https://www.globalsecurity.org/military/systems/munitions/105t.htm
https://www.thefirearmblog.com/blog/2018/03/05/us-army-calls-next-generation-squad-automatic-rifle-prototypes/
1 k.s.i. = 1000 p.s.i.,
80 k.s.i. = 80,000 p.s.i.
http://www.foxnews.com/tech/2018/07/19/armys-new-machine-gun-will-blast-like-battle-tanks.html
http://video.foxnews.com/v/5811182850001/?#sp=show-clips
A higher chamber pressure increases the exit velocity of a bullet from the barrel of a gun. Gun-powder has volume limits. Probably electric guns have a much greater potential for exit velocity for several reasons comparable to putting one's foot on the accelerator and brake simultaneously before releasing the brake.
In theory one could build a large electric machine gun on the moon and use the Earth as a practice target testing to determine if the bullets could penetrate all the way through and out the other side of that planet. Just kidding. It might be useful as a tool for shooting dangerous asteroids though.
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