If this whole hypothesis pans out, the difficulty in making a space craft that makes use of this phenomenon is that it would eventually build up a large positive charge, which would eventually damage the craft, if it can't be dealt with.
Wait. I'm confused. If it's spitting out electrons that are *part* of it, yes, it'd go positive. It'd also be losing mass (and changing composition) which puts it right back into the "I am fuel and will run out" category.
But if the electrons are merely the photons re-directed out one edge here, then it's a conduit, like a wire, not a charge reservoir or source. Just as a wire doesn't constantly gain positive charge because electrons are moving along it, I don't see why this stuff would either.
And if the photons are coming from outside... well, there's no reason for something that arrives and then leaves to change the net charge of the thing it is passing through/by/along/whatever. Again, just like a wire.
Or do I have this all wrong?