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Post by yehang79 on Jul 12, 2023 9:33:50 GMT
According to this thread: childrenofadeadearth.boards.net/thread/3266/mass-drivers-rate-fire, sandblasters far outweigh mass projectiles. But in real life, skin effect and barrel could cause fatal problems to steel sands. It's hard for me to believe a railgun could shoot 1g weighted cake-like-projectiles with 100km/s speed and spread angle like 10^-7 deg. That's definitely impossible in real life. Due to skin effect, where alternating current tends to avoid travel through the center of a solid conductor, limiting itself to conduction near the surface. This kind of thing would probably turn 1g cakes into plasma and probably deals a lots of damage to barrel. So, does sandblasters really works? |
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Post by sage on Jul 12, 2023 20:23:08 GMT
According to this thread: childrenofadeadearth.boards.net/thread/3266/mass-drivers-rate-fire, sandblasters far outweigh mass projectiles. But in real life, skin effect and barrel could cause fatal problems to steel sands. It's hard for me to believe a railgun could shoot 1g weighted cake-like-projectiles with 100km/s speed and spread angle like 10^-7 deg. That's definitely impossible in real life. Due to skin effect, where alternating current tends to avoid travel through the center of a solid conductor, limiting itself to conduction near the surface. This kind of thing would probably turn 1g cakes into plasma and probably deals a lots of damage to barrel. So, does sandblasters really works? That is a good question. As far as I know it does not take into account the skin effect of the outer layer of a 1g projectile, turning into plasma. I would have to look into, but if so, then sandblasters (or as I sand caster) would not be possible as they would damage the barrel. Given the short range of non-sandblasters coil and rail guns, all fights would be between ships with lasers and/or missiles. |
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Post by sage on Jul 12, 2023 21:02:11 GMT
in addition, I will have to look into if the same effect would happen to coilguns vs railguns. We have built sandblasters (or as I call them sandcaster) from both coilguns and railguns. It just more effective to build them out of railguns.
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Post by yehang79 on Jul 13, 2023 2:13:53 GMT
I looked into some magazines about this.
"When electromagnetic railguns are launched, they accelerate the projectile under the condition of strong pulse current at the MA level with harsh working conditions. The material needs to withstand great instantaneous heat flow impact, which can easily cause serious erosion of the track. The ablation armature and guide rail are heated during the launch of the railgun. This type of heat source is not only the friction between the armature and the guide rail, but also the Joule heat generated by the current and arc. This heat may cause the armature to melt or even weld to the guide rail."
"Due to the constant concentration of current at the trailing edge of the contact surface, the melting propagates forward under the effect of velocity skin effect, forming a gap. Due to the existence of the gap, the ablated armature no longer contacts the track. Moreover, when the melting wave passes through the entire contact surface, the armature separates from the track, and the contact mode is converted from metal to metal contact to arc contact, which may cause the armature to transition. Further analysis shows that the higher the armature movement speed is, the greater the Magnetic flux density of the exciting magnetic field is, and the faster the ablation progress is."
"To sum up, Under a strong current of 10^6A, the high-speed armature rail structure was severely eroded and worn, affecting the service life of the electromagnetic rail gun."
--"Equipment Theory and Equipment Technology", Baoquan M., Tianyi Z., Xianghua B., Rui Z.
That's a serious problem. Though the projectile itself was not damaged that much. The real problem happens to barrel.
By the way, according to this article, damage of skin effect seems to reduce on coilguns:
"The simulation analysis results indicate that the skin effect of current velocity plays a major role in the ablation between the track."
--same article
“The coil gun operates at a lower current than the rail gun and has relatively high efficiency. Although its high efficiency comes from the reduction of total Ω loss accumulated in the winding coil, many influencing factors still need to be considered.”
--"Electromagnetic weapons research", 1993, CPPCC
Another edit: I think reconnection guns wouldn't suffer this kind of problem, give that they got no barrel at all(i cant find any research on this)
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Post by sage on Aug 8, 2023 22:41:02 GMT
I am still looking in that problem but based on the feedback from you and other sources, I'm changing my Short Range Lasers (stand ins for the Short Range Lasers used in AV:T) to 750nm Alexandrite-Liquid Holmium and my Medium Range Laser (stand ins for the Medium Range Lasers used in AV:T) to 694nm Ruby-Liquid Holmium.
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