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Interesting that the real advantage of lattice grid fins will probably end up being for packaging efficiency (as pointed out in the latter half of the page that PMN1 linked to)- I had always been under the impression that the grid fins were better as they allowed smaller actuators, but the points of drag and increased RCS I'd never thought about. But in a short-range weapon or a bomb, they certainly do sound compelling- particularly with LO aircraft having to carry weapons internally, then packaging efficiency is paramount.