High tech armor vs Ultra-tech armor

[weby]

Originally Posted by Anthony

I would note that the other problem with high tech armors is that they really don't layer the way GURPS makes them. A level IIIa vest is DR 12, so that implies two of them (DR 24) will stop or nearly stop 7.62 ball, three of them (DR 36) will stop 5.56mm AP, and 4 of them will stop 7.62AP. In reality... not even close. This should likely also be true for ultratech armors, it's a general issue with flexible armors that doubling thickness means about twice the energy to penetrate, while doubling hard armor thickness will probably require three to four times more energy.

In Gurps damage and peneration are calculated as square root of energy, so if the system was internally consistent it would use that as scaling, that is adding a second of same DR would multiply the result by 1.4 effective DR instead of *2