Table top rules:
Internal = 3 pts
Armor = 9 pts
MWO (Double armor/internal rules?)
internal = 6
Armor = 18
To survive 1 hit from all weapons to your cockpit:
AC 20 = 20 dmg = 24 - 20 = 4, -1 to have 1 internal remaining after being head shot by an ac 20 = 3 armor your can take off the head.
Normally, even with full armor max
ac = 20 * 2 = 40. kills you in two hits anyway
gauss rifle = 15 * 2 = 30 kills you in two hits anyway
PPC = 10 * 3= 30 kills you in 3 hits no matter what
Large laser = 8 *3 kills you in 3 hits no matter what
Summary, you can shave 3 points of armor from your head and still have a very tough noggin.
if you want to be able to survive only a gauss to the head you shave off up to 8 points of armor.
This isn't advised for assault mechs but for light fast mechs
Edited by ManDaisy, 02 July 2012 - 10:33 AM.