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A projectile is anything that flies, unpowered, through the air, regardless of whether it is "tethered" or not. Besides, a tether like that would definately constitute and "obvious risk of entaglement".
As for the air cannon, I'm guessing that's illegal to, as it would be a custom pneumatics device. On the other hand, if you used a piston to hit the beanbag really hard, this rule wouldn't apply.
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