Not particularly cheesy. Striking Scorpions are slaughtering machines that are a terror to massed infantry. I'm debating whether or not to blow my friend away by charging his Tyranids with Banshees and Scorpions (against Nidzillas and medium infantry, respectively). 4 attacks (with the chainsword +1 S factored in) is pretty murder to light and medium infantry.
Alternatively, you could arm him with the Scorpion's Claw and be able to pop Leman Russes.
Why? The only difference is in the strenght of the attack, the claw will always be S 6, with the biting blade varying between S 4 and S 8 depending on the amount of hits, and against a stationary vehicle he will have the maximum amount of hits thus resulting in more likelyhood of destroying it. I'm not sure how you handle the modifiers on the damage chart, but power weapons are not ap1 (they just do not allow armour saves) so I don't think they get any bonus when rolling the damage against vehicles, I'm actually not sure how to resolve melee attacks against vehicles, off hand it seems they should always get -1 on the damage roll since there are no melee attacks I know of that have an AP value and thus should count as 'AP- weapons' attacks, but I'm not sure about that last part.
Are powerfists 2S + 1D6? If so, you are right, as long as the tank didn't move.
Yes I know that you only use the strength, I was pointing out that you don't get the AP1 bonus from power weapons. In a sense I think all melee attacks are really AP-, but since it never explicitly says so either I would say that according to the rules you can never get either the AP bonus or the AP drawback on the damage roll against vehicles.
I understand that "in a sense" that could apply, but in actuality, there is simply no AP value, anyway. AP- is still an AP value; AP just simply does not apply at all.
