I just need to know if there is some ruling or if the whip works acc. to RAW?

Why wouldn't it? AP modifiers are included in the description of hardened armor.

Indeed, so long as you are not facing something with a 12 or higher Hardened Armor (whip having 8DV plus -4AP in SR4, not seen SR5 version) you should be able to affect it.

It shouldn't matter even if it is 12 or higher. The test to see whether you can punch through hardened armour includes your net hits on the attack test. So if they had 14 points of hardened armour, you would need 3+ net hits to punch through with the whip.

I just thought there could be a special ruling e.g. like for dartguns agains hardened armor, or whips against barriers. Thanks for the quick answers.

In previous editions there used to be a special rule for hardened armor and the monofillament whip. I wish they had kept it.

Monofilament whips in SR3 halved impact armor, but barriers counted as double. They are even worse against barriers in SR4, doing only a base DV of 1 (and weapons used against barriers ignore their AP rating).*

*Table on pg. 158 of SR4; not sure what page it would be in SR4A.

Page 166.

~Umi

Yeah and projectiles and bullets suck too. But that has no bearing on how effective the monowhip is against hardened armour.

It's just as effective as any other weapon, modifies it in the exact same way.

You're probably better off with SnS rounds, though.

~Umi