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Even I'm going to build a similar prototype soon. The coil should not be wound around the rails but on top of them. Refer to left hand rule and right hand grip rule. I don't think you can put a spin on the projectile this way. It's better to put the coil in series with the rails. My YouTube channel:https://www.youtube.com/channel/UCoqOSu_2aKcgYsi7_...
Yep, you can. Usually carbon or graphite are better than metals since they do not 'stick' to the rails.
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