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A top comment on HN:
"The Wikipedia article on shaped charges is fascinating:
https://en.wikipedia.org/wiki/Shaped_charge
The penetration distance is proportional to the diameter of the charge (counterintuitive; you'd expect the height), and can be up to 7x as large. So a ~5 inch charge shown in the film can penetrate up to about 3 feet of solid steel.
Also, all of our known defenses against shaped charged rely on the assumption that the same spot won't get hit twice. Composite armor breaks and deflects the geometry of the jet through its deformation; reactive armor relies on a mini-explosion to defeat the jet. This has interesting implications in a world of drones and precision-guided munitions, and in fact the Javelin missiles we've been shipping to Ukraine have double warheads, the first to destroy the armor and the second to destroy the vehicle. "
"The Wikipedia article on shaped charges is fascinating:
https://en.wikipedia.org/wiki/Shaped_charge
The penetration distance is proportional to the diameter of the charge (counterintuitive; you'd expect the height), and can be up to 7x as large. So a ~5 inch charge shown in the film can penetrate up to about 3 feet of solid steel.
Also, all of our known defenses against shaped charged rely on the assumption that the same spot won't get hit twice. Composite armor breaks and deflects the geometry of the jet through its deformation; reactive armor relies on a mini-explosion to defeat the jet. This has interesting implications in a world of drones and precision-guided munitions, and in fact the Javelin missiles we've been shipping to Ukraine have double warheads, the first to destroy the armor and the second to destroy the vehicle. "