aznriptide859 Posted September 21, 2010 Report Share Posted September 21, 2010 http://gizmodo.com/5643971/watch-this-125-kilojoule-diy-coilgun-smash-household-items Anyone else notice he's using what looks like an airsoft battery pack? XD Link to post Share on other sites
hwagan Posted September 21, 2010 Report Share Posted September 21, 2010 And what appears to be a modified P226 grip and trigger, airsoft or otherwise. Either way, i want 15 of them. Link to post Share on other sites
pace Posted September 21, 2010 Report Share Posted September 21, 2010 Like that a lot. Shows up the potential in the market for these things, makes you wonder what MOD/DARPA are playing around with. Link to post Share on other sites
mattmanic Posted September 21, 2010 Report Share Posted September 21, 2010 The US Navy are testing artillery based on the same principle at the moment Link to post Share on other sites
Scuffer Posted September 21, 2010 Report Share Posted September 21, 2010 Sick as *fruitcage* Link to post Share on other sites
ED-SKaR Posted September 22, 2010 Report Share Posted September 22, 2010 Not even close to 1.25 KJ, not even a tenth of that. A crossbow would be as/more powerfull and much faster to "charge". Still, for something knocked up out of old mobiles and scrap... tis impressive. Link to post Share on other sites
hwagan Posted September 22, 2010 Report Share Posted September 22, 2010 If the zombies were coming and firearms were too difficult to obtain, i'd be fashioning a Crossbow/Catapult/Bow before that thing... However, the fact someone has the knowledge, skills and ingenuity to make that thing amazes the hell out of me - And it definitely looks far more awesome than any other home made weapon i've seen Link to post Share on other sites
Seraphim989 Posted September 22, 2010 Report Share Posted September 22, 2010 I was expecting something ghetto looking but no, instant erection when I went to that page Link to post Share on other sites
Squab27 Posted September 22, 2010 Report Share Posted September 22, 2010 That was awesome! Link to post Share on other sites
DrKalinka Posted September 22, 2010 Report Share Posted September 22, 2010 Not even close to 1.25 KJ, not even a tenth of that. A crossbow would be as/more powerfull and much faster to "charge". Still, for something knocked up out of old mobiles and scrap... tis impressive. Did you read the article? It is 1,25KJ on the capacitors. Thats how many joules they can store. The video also says it is 3% efficient in turning that energy into kinetic energy. Calculations put this gun more powerful than a .45 handgun. The bulletweight is just massively higher and as such, it travels slower. If he had made a smaller bullet, i bet it would be more efficient as more energy would be used to propel it to higher speeds than to accelerate that massive lump of iron. Also, a crossbow is an old, perfected technology. This one is a new one. Bordering 50 years old. Seeing as the crossbow is more than a thousand years old, and probably older, it is a pretty bad comparison. Link to post Share on other sites
Seraphim989 Posted September 23, 2010 Report Share Posted September 23, 2010 Did you read the article? It is 1,25KJ on the capacitors. Thats how many joules they can store. The video also says it is 3% efficient in turning that energy into kinetic energy. Calculations put this gun more powerful than a .45 handgun. The bulletweight is just massively higher and as such, it travels slower. If he had made a smaller bullet, i bet it would be more efficient as more energy would be used to propel it to higher speeds than to accelerate that massive lump of iron. Also, a crossbow is an old, perfected technology. This one is a new one. Bordering 50 years old. Seeing as the crossbow is more than a thousand years old, and probably older, it is a pretty bad comparison. Did YOU read the article? It says 1.25 kJ of muzzle energy would be greater than that of a .45, and it does not release that much energy. The comparison is that a crossbow is more efficient and is valid. Though Id prefer a longbow myself Link to post Share on other sites
Desolation mkII Posted September 23, 2010 Report Share Posted September 23, 2010 I was considering a project like this for a while. Just not sure of the legality of it. Link to post Share on other sites
DrKalinka Posted September 23, 2010 Report Share Posted September 23, 2010 Did YOU read the article? It says 1.25 kJ of muzzle energy would be greater than that of a .45, and it does not release that much energy. The comparison is that a crossbow is more efficient and is valid. Though Id prefer a longbow myself I am just going to quote this. Larsplatoon dubs it a "1.25kJ Coilgun"—that's some 78 times the amount of energy lethal to human beings—though Make points out that that's likely the capacitor's theoretical maximum output. You are right. I misread the article, but my point still stands. Link to post Share on other sites
ED-SKaR Posted September 24, 2010 Report Share Posted September 24, 2010 You are right. I misread the article, but my point still stands. Learn the science behind the machine before you assume a lighter weight projectile would carry more energy. In truth, its the other way round. Link to post Share on other sites
DrKalinka Posted September 24, 2010 Report Share Posted September 24, 2010 I did not say it would carry more energy. I said it would be faster. Giving the impression of more energy. Since the projectile was so slow, it lost energy way too fast because of that gigantic slug. Having a lighter projectile would mean longer range and probably more penetrating power because the speed would be that much higher. Link to post Share on other sites
ED-SKaR Posted September 24, 2010 Report Share Posted September 24, 2010 I did not say it would carry more energy. I said it would be faster. Giving the impression of more energy. Since the projectile was so slow, it lost energy way too fast because of that gigantic slug. Having a lighter projectile would mean longer range and probably more penetrating power because the speed would be that much higher. You obviously have only the slightest grasp of physics. Half what you say is right, the other half is completley wrong. Link to post Share on other sites
greg Posted September 24, 2010 Report Share Posted September 24, 2010 Very modern. So, a relatively high voltage battery powered solenoid. We was makin this stuff up when we was kids. Mmmm. Yes. Much more dangerous than say a,,,,,,,,,,,,,,,,,, knicker elastic catapult? You can tell it's powerful by the backstop,,,,,, a cardboard box! Personally I'd be more intimidated by someone holding a can of WD40 & a lighter. Or one of those 6 foot long spud guns you make with plastic piping & load up with hair spray. Everyone should make stuff like this, it's fun but hardly home defense. Greg. Link to post Share on other sites
QQexDERA Posted September 24, 2010 Report Share Posted September 24, 2010 Like that a lot. Shows up the potential in the market for these things, makes you wonder what MOD/DARPA are playing around with. Some of my now ex colleagues were working on some quite large railguns a while back - and it wasn't just MoD paying for it either. Very, very impressive kit from the vids I got to see Link to post Share on other sites
The End Posted September 28, 2010 Report Share Posted September 28, 2010 Does anyone else feel that this is a hoax? look at the projectile hes shooting...i think this might be using compressed air, but very cool nonetheless. Link to post Share on other sites
greg Posted September 29, 2010 Report Share Posted September 29, 2010 Does anyone else feel that this is a hoax? look at the projectile hes shooting...i think this might be using compressed air, but very cool nonetheless. It may be a hoax, after all, it is on the internet, so chances are it's total ######. However, the projectile just looks like the push rod from the solenoid, having been roughly shaped like a bullet. He's only chucking it a few meters, breaking brittle plastic, punching thin metal & cardboard. As said before, we were doing this sort of thing as pre teens, over 30 years ago. It's not exactly new or impressive. We used a 12v car battery & fired it at glass milk bottles. It's interesting to see that all that's changed, is the size of the power pack & the material used to pack milk. Greg. Link to post Share on other sites
amateurstuntman Posted September 29, 2010 Report Share Posted September 29, 2010 I used to fire hard frozen oranges out of a length of drain pipe that had a plate welded over one end and a spark plug tapped into it. Squirt of petrol, frozen orange, aim, rip the pull start off the lawn mower I cut up, BOOM. Hell of a lot more powerful and I built it in one weekend. Link to post Share on other sites
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