sometimes like 20 laser-comanches crash AT ONCE when under fire. is that normal? I play version 1.1

I also noticed that too (the hard way). Enemy has 2 gattling tanks I have 10 Laser-ches. Somehow, when one che was killed, the rest just died.
Does Laser-che explode when dead?

No, they don't. You know how some planes when they die and crash, they do damage to the things they hit? Yeah, that but this is the heli version. Something to do with the death or collision or something. Been around since vGen.

Are they really close together? If so it might be splash damage from the bullets.

It also happend to me with a bunch of helix. there was just 1 gattling-turret in rage and all the helix were killd at the same time...

there realley seems to bu a heli bug in this game..

Gattling has no splash damage (seeing from INI code) and they're not that close. Though they flew in close formation, there is some distance apart (even missiles can't take out all of them due to splash). Collision damage sounds more viable.