Ships & Modules

Yes, sometimes. My SNI uses 4 BCSes.

On my Loki I get 315 base dps.

With 1 gyro stab I get : 387 ( that's a 72 bonus dps ) ~22% bonus to base damage
With 2 gyro stabs I get : 463 ( that's another 76 bonus dps ) ~24% bonus to base damage
With 3 gyro stabs I get : 521 ( that's another 58 bonus dps ) ~18% bonus to base damage

Total bonus to damage : ~65%

As you can see using second gyro is giving bigger bonus ( per module ) than first one. You start 'loosing' bonuses when fitting 3+.

Each module applies it's bonus separately ( to value modified by previous module ) and each consecutive mod has stacking penalty applied.

First mods is 100% strong.
Second mod is 87% strong.
Third mod is 57% sting.

First mod applies it's full bonus to base damage.
Second mod applies 87% of it's bonus to ( base damage + first mod bonus ).
Third mod applies 57% of it's bonus to ( base damage + first mods bonus + second mod bonus ).

People usually fit at least two weapon mods ( biggest boost for used slots ). Third mod is quite often added if fitting allows it ( sometimes bigger bonus is more important than a slot, especially when it comes to damage ). More than 3 mods is very uncommon.

Meh. Bad numbers are bad.

1st: 1
2nd: .87
3rd: .57
4th: .28
5th: .11
6th: .03
7th: .006
8th: .001

Formula: 0.5^(((stacking number-1)/2.22292081)^2)

And just because it hasn't been mentioned yet in this thread: modules don't stack, attribute modifiers stack. What's the difference? Well, take damage mods as an example. Say you fit three of them plus a T2 RoF rig. Since damage mods affect both damage and RoF, the damage stack goes damage mod 1, damage mod 2, damage mod 3 but the RoF stack goes rig, damage mod 1, damage mod 2, damage mod 3. So the damage mods exist in both the first, second, and third position with regard to their raw damage increase but in the second, third, and fourth position with regard to their RoF increase.

Clear as mud?

If you have enough skills, and/or money, and know how to do the missions "safely" you don't need to use any of your low slots for capacitor on a raven. In point of fact you can field, and power, a tank strong enough for smart L4 mission running with 4 cap mods at most, three CR2s and a CCC rig, while leaving your low slots free to push 700+ rDPS.

Yes. That's pretty much what I said.

As another example, think of resists. You fit, say, an EANM, two explosive hardeners, and a kinetic hardener. In the case of explosive resists, the EANM is third in the stack, operating at 57% of its potential. In the case of kinetic, the EANM is second in the stack and gets 87% of its possible resists. On thermal and EM, the EANM gets full effect because it is first in the stack.