[Spaceships] Conventional and EM Gun ranges in atmosphere?

[vicky_molokh]

Originally Posted by Anthony

As a horribly crude approximation, figure that atmospheric half damage range is about 50,000x projectile diameter (so 100m per mm of size). This assumes fairly long streamlined projectiles, and is probably overly generous, but GURPS tends to be rather generous with its 1/2d ranges.

Thanks. Seems in the right ballpark - a jet-mounted 30mm autocannon in one of the Pyramids has roughly half the ½D of your calculation. I was just unsure with what it should scale, and with what it shouldn't. E.g. higher-speed bullets from ETC, LP, Gauss and Grav guns seem to have greater ranges than conventional ones.

Edit: that's half, not twice. That is, the Pyramid autocannon has less ½D.