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So the plasma blocks light. It would be hard to steer since the plasma would fill a 3-dimensional volume of space, a sheet of aluminum is very thin in one dimension, so light moving parallel to the plane of an aluminum sail would not be blocked at all, but a toroidal plasma sail would have a significant thickness, and light approaching the edge of it would still be blocked. This would be like sailing with a balloon, it would be good for going downwind with little ability to tack against the wind the way sheet sails can.
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