Live data from Hacker News

EXACTO demonstrates first-ever guided .50-caliber bullets

darpa.mil

101–110 of 158 posts

Re: EXACTO demonstrates first-ever guided .50-caliber bullets

#101
post #9

The video and program page[1] don't reveal anything about how this works. I remember watching a documentary a few years ago on Discovery channel where this project was discussed. The bullet was essentially divided into a front and back portion, which could twist independently. The twisting then allows for corrections in the air. There's another design by Sandia labs where the bullets has little "fins" (like a missile…

[deleted]

Re: EXACTO demonstrates first-ever guided .50-caliber bullets

#102

I wonder if there are any startups in weapon technology.

> startups in weapon technology

Metal Storm: old but interesting. Mike O'Dwyer conceived of an idea for "a rapid-fire gun prototype ... can fire up to 1,000,000 rounds per minute, or 16,000 rounds per second." [0] to give extra fire-power for Special Forces soldiers. More details can be read here: http://www.abc.net.au/austory/transcripts/s167329.htm

cf: [0] https://en.wikipedia.org/wiki/J._Mike_O%27Dwyer

Re: EXACTO demonstrates first-ever guided .50-caliber bullets

#103
This rifle by TrackingPoint takes another approach but seems similarly effective, the main thing that it doesn't account for is wind changes. I think you basically hold down the trigger and it fires when it thinks it'll hit the target.

https://www.youtube.com/watch?v=QVLmf_CBHKM

https://www.youtube.com/watch?v=YBC8IFWC1P0 "Vice - The Rifle That Aims Itself"

https://www.youtube.com/watch?v=1mZB6NtCx38 Moving targets

https://www.youtube.com/watch?v=OA_ndsi5wnA

https://www.youtube.com/watch?v=xleHVuj2uGQ

Re: EXACTO demonstrates first-ever guided .50-caliber bullets

#104
post #9

The video and program page[1] don't reveal anything about how this works. I remember watching a documentary a few years ago on Discovery channel where this project was discussed. The bullet was essentially divided into a front and back portion, which could twist independently. The twisting then allows for corrections in the air. There's another design by Sandia labs where the bullets has little "fins" (like a missile…

[deleted]

Re: EXACTO demonstrates first-ever guided .50-caliber bullets

#105
post #9

The video and program page[1] don't reveal anything about how this works. I remember watching a documentary a few years ago on Discovery channel where this project was discussed. The bullet was essentially divided into a front and back portion, which could twist independently. The twisting then allows for corrections in the air. There's another design by Sandia labs where the bullets has little "fins" (like a missile…

That may explain how the target corrects its trajectory towards the actual target, but how does the bullet determine what the "actual target" is in the first place? I would imagine this would be simple in test cases, but in the real world, what about a hostile target may differentiate it from a friendly ally that is nearby?

Some new rifles allow you to "tag" targets and with sufficiently advanced software it should be able to tell the difference, unless the two targets overlap, then it's a maybe.

Sniper rifles already exist that can tag and track moving targets.

Re: EXACTO demonstrates first-ever guided .50-caliber bullets

#106

I wonder if there are any startups in weapon technology.

> startups in weapon technology Metal Storm: old but interesting. Mike O'Dwyer conceived of an idea for "a rapid-fire gun prototype ... can fire up to 1,000,000 rounds per minute, or 16,000 rounds per second." [0] to give extra fire-power for Special Forces soldiers. More details can be read here: http://www.abc.net.au/austory/transcripts/s167329.htm cf: [0] https://en.wikipedia.org/wiki/J._Mike_O%27Dwyer

Were these the guys who adapted their technology to fire fertiliser pellets into the ground from the air, for agricultural purposes?

Re: EXACTO demonstrates first-ever guided .50-caliber bullets

#107
post #94
post #63

Earlier quoted context omitted.

The basis of American freedom isn't some libertarians with rifles. Its the fact that the U.S. military consists of poorly-paid kids who care more about family and community than they do about abstract ideas. That and the fact that the military and its arsenal is physicislly distributed over numerous states. More powerful military technology makes us more free, not less. It just means it takes fewer people to break ra…

How about when we replace the kids with war drones and robots?

Hope you have generals that were soldiers instead of politicians or businessmen, I suppose.

Re: EXACTO demonstrates first-ever guided .50-caliber bullets

#108

I wonder what each bullet will cost once production starts? I sometimes think about the origins of the second amendment and if it's intent was to empower citizens against a potentially oppressive government then it has failed. US military technology might as well be black magic. What can a "well regulated militia" do against smart bullets, M1 Abrams, Apache helicopters, etc? Thank goodness we are kept fat and happy.

Fire is a cheap and freely available force multiplier.

Re: EXACTO demonstrates first-ever guided .50-caliber bullets

#109
post #89
post #22

Earlier quoted context omitted.

I commented below that it's marked by laser, but the counterargument was that if you can aim a laser you can aim a rifle. Let me rephrase: the goal of this system is to correct for deviations from the actual target which occur in the air. Because of wind, temperature, rotation of the earth (when taking really long shots) and other factors a marksman might have to adjust his or her aim and actually aim off-target to g…

Why would the rotation of the earth matter? It's a constant speed and the person that fires it is rotating with the earth so the rotation is already part of the trajectory of the bullet. So is the wind for that matter.

Two points on earth with different latitudes move at different speeds. The effect that affects the bullets is known as the coriolis effect (http://en.wikipedia.org/wiki/Coriolis_effect).

Re: EXACTO demonstrates first-ever guided .50-caliber bullets

#110
post #63

I wonder what each bullet will cost once production starts? I sometimes think about the origins of the second amendment and if it's intent was to empower citizens against a potentially oppressive government then it has failed. US military technology might as well be black magic. What can a "well regulated militia" do against smart bullets, M1 Abrams, Apache helicopters, etc? Thank goodness we are kept fat and happy.

The basis of American freedom isn't some libertarians with rifles. Its the fact that the U.S. military consists of poorly-paid kids who care more about family and community than they do about abstract ideas. That and the fact that the military and its arsenal is physicislly distributed over numerous states. More powerful military technology makes us more free, not less. It just means it takes fewer people to break ra…

Look at what the U.S. military has been doing - they're effectively well paid mercenaries. For the last 60 years, hardly anyone in the military has had a vested interest in any of the conflicts, and does it just for the money.
Post reply on HN