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Registered Member #2985
Joined: Fri Jul 09 2010, 04:05PM
Location: Chippewa Falls, WI
Posts: 9
I have seen a few coilgun designs in which a spin is induced for accuracy on the bullet using magnetic coils. How does this work? Could it be used for faster types of propulsion? I think the advantage is that this would not decrease performance as much as rifling.
Registered Member #2648
Joined: Sun Jan 24 2010, 12:45PM
Location: Australia
Posts: 291
Awhile ago, I asked this question to the guy working on this here: Apparently He uses a slotted projectile (not 100% rotational symmetry) and spins it like a single pole reluctance motor... maybe me means two pole...
Theres also the design for another one here:
and I don't think rifling would work unless you used a grooved projectile.
Registered Member #16
Joined: Thu Feb 02 2006, 02:22PM
Location: New Wilmington, PA
Posts: 554
I thought I posted a reply to this last night, but apparently I never bothered to hit the send button.
If your projectile was a permanent magnet, and polarized diametrically, instead of axially, it would probably be possible to induce spin on the projectile with small 'kicker' coils outside the barrel at strategically placed locations, but it wouldn't be simple.
Realistically the best way to impart spin would probably be to use a spindle that gripped the projectile with an electromagnet, and kept the projectile centered in the barrel to avoid uneven friction. The spindle would then be turned by a regular motor to impart spin. When the propulsion coil fired, the electromagnet on the spindle would release. If you did it with a high enough degree of precision, you'd probably avoid too high a degree of friction or chatter in the barrel caused by the spin.
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Electromagnetic Projectile Spin
