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Post by goduranus on Dec 13, 2016 5:44:14 GMT
My reasons:
1: Magnetic field may fry electronics
2: Induced current will form magnetic field that could crush metal structures of the payload
3: Coilgun has too much acceleration (1 million gs), which the structure of a complex payload will not be able to withstand
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Post by n2maniac on Dec 13, 2016 6:22:34 GMT
The ingame coilguns utilize ferromagnetic properties of the projectiles. This field level is similar to that of a strong magnet or electric motor. The game even complains if you attempt to go higher.
Coin shrinkers are operating purely on eddy currents (read: doing it the very hard way and still managing).
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Post by bigbombr on Dec 13, 2016 8:47:40 GMT
The ingame coilguns utilize ferromagnetic properties of the projectiles. This field level is similar to that of a strong magnet or electric motor. The game even complains if you attempt to go higher. Coin shrinkers are operating purely on eddy currents (read: doing it the very hard way and still managing). Could this be weaponised? |
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Post by amimai on Dec 13, 2016 9:42:49 GMT
The ingame coilguns utilize ferromagnetic properties of the projectiles. This field level is similar to that of a strong magnet or electric motor. The game even complains if you attempt to go higher. Coin shrinkers are operating purely on eddy currents (read: doing it the very hard way and still managing). Could this be weaponised? its like a 1shot rail gun/coil gun where you would have to swap out the barrel after every shot due to warping/melting, you can get a shot to go 20km/s off a hand held device but you only get 1 shot before the barrel needs replacing or risk having barrel shrapnel going the same speed into your face |
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Post by The Astronomer on Dec 13, 2016 10:04:08 GMT
Could this be weaponised? its like a 1shot rail gun/coil gun where you would have to swap out the barrel after every shot due to warping/melting, you can get a shot to go 20km/s off a hand held device but you only get 1 shot before the barrel needs replacing or risk having barrel shrapnel going the same speed into your face We aren't going to swap the rails every 10 milliseconds, right? |
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Post by goduranus on Dec 13, 2016 12:28:25 GMT
Could be a final stage of a kinetic missile.
Also how strong is the magnetic field inside one of the game's coilguns? It is really weaker or increasing slower than the popcan cutter?
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Post by shurugal on Dec 13, 2016 17:36:33 GMT
The ingame coilguns utilize ferromagnetic properties of the projectiles. This field level is similar to that of a strong magnet or electric motor. The game even complains if you attempt to go higher. Coin shrinkers are operating purely on eddy currents (read: doing it the very hard way and still managing). Could this be weaponised? A Thompson Coil Gun works on this principal. The coil sits behind the non-magnetic projecting, and generates a powerful eddy current when energized. This eddy current runs contrary to the coil, and so the magnetic fields repel one another, violently. |
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Post by n2maniac on Dec 14, 2016 6:05:46 GMT
Could be a final stage of a kinetic missile. Also how strong is the magnetic field inside one of the game's coilguns? It is really weaker or increasing slower than the popcan cutter? Yes: Taking a rough number from here: ~100kA * 12 turns / 2cm = 60,000 kA/m. 1750 kA/m is iron's saturation magnetization, on the order of 30 times lower. Eddy currents (generally) require much larger field strengths to see a similar force to electromagnetism. Drop a strong magnet down a copper pipe to see eddy currents (if you haven't done this, you should just because it is really cool!). Then drop it onto a steel pipe,pull it off, and compare the forces. |
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Post by goduranus on Dec 14, 2016 7:00:48 GMT
I actually found the places to buy a rare earth magnet and a copper pipe for cheap, but decided against it since I often get careless and might injure people.
Thanks for the math, I haven't done the math, but although forces from eddie current may be much weaker than force from the coils on the aperture, wouldn't that still be a very strong?
Say if the coilgun accelerates the slug to 8km/s with 4meters of coils, that's zero to 8km/s in 0.001 seconds, so the acceleration is 8000km/s^2, which for a 5kg projectile is 40 million newtons, even a fraction of that is still a hefty amount of force. Wouldn't this be strong enough to crush propellant cans/warheads?
Also, let's say that eddie currents is not strong enough, how about the mechanical forces from 8000km/s^2 of acceleration?
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Post by newageofpower on Dec 14, 2016 7:11:02 GMT
I actually found the places to buy a rare earth magnet and a copper pipe for cheap, but decided against it since I often get careless and might injure people. Thanks for the math, I haven't done the math, but although forces from eddie current may be much weaker than force from the coils on the aperture, wouldn't that still be a very strong? Say if the coilgun accelerates the slug to 8km/s with 4meters of coils, that's zero to 8km/s in 0.001 seconds, so the acceleration is 8000km/s^2, which for a 5kg projectile is 40 million newtons, even a fraction of that is still a hefty amount of force. Wouldn't this be strong enough to crush propellant cans/warheads? Also, let's say that eddie currents is not strong enough, how about the mechanical forces from 8000km/s^2 of acceleration? How would you injure people??? If you were going to beat people with a chunk of copper pipe, you could do that with a plastic or lead pipe. Or just a stick. |
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Post by goduranus on Dec 14, 2016 7:29:55 GMT
Huh? With a rare earth magnet some kid could have picked it up and get his hands crushed or damage my electronics.
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Post by shurugal on Dec 14, 2016 12:47:49 GMT
do you have "some kid" who would have access to the magnet?
do you refrain from buying cleaning products for your house because "some kid could have picked it up" and ingested it?
if you are so careless that you might injure someone with a magnet, you *definitely* should not be allowed to operate heavy machinery, which includes cars.
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Post by thorneel on Dec 14, 2016 13:03:46 GMT
How strong is that magnet to be that dangerous?
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Post by goduranus on Dec 14, 2016 13:42:15 GMT
I was looking at a 1kg Neodymium cylinder and a 45mm-inside diameter bronze tube to go with it.
I would say that it is quite dangerous, because it not intuitive how strong it is just by looking at it. If the person holding it doesn't realize it's a magnet, it might be too late by the time he feels the force.
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Post by shurugal on Dec 14, 2016 13:56:59 GMT
I would say that it is quite dangerous, because it not intuitive how strong it is just by looking at it. If the person holding it doesn't realize it's a magnet, it might be too late by the time he feels the force. This is true of a great many household items. You wouldn't store bleach in an unlabeled bottle, would you? The magnets you showed in the video come in a case that clearly marks what it is, with a nice warning sheet, for the same reason. |
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