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SLAT armor will not provide much protection against bigger ATGM missiles(Hellfires,AT-6,9 e.t.c... have better pen than 33..) as their mass and speed could destroy grill and penetrate base armor.
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Are you sure about that? ATGMs are generally somewhat slower than RPG rockets and such, and have therefore less kinetic energy to smash the grid. Anyway most HEAT warheads have quite a fragile front cover and thin detonator, and will get crushed against the bars without detonating.
And even if they do detonate, the penetrator will have to cross a great amount of air that will slow it down, cool it down slightly and presumably deflect and disperse it.
So the question is: how much does this air layer affect the penetrator? In other words, how much steel does it stand for against HEAT?
I think we can neglect the thickness of the grid itself, so the main up-armoring component will be air, in the case where the rocket detonates.