Class 4 Railguns would be stupidly broken, that's why. They would basically be a Plasma Accelerator with no projectile aiming skill needed, and would shrek modules even more already. This is just a problematic idea on so many levels.
Not necessarily. I thought that would be the case too, but after quickly looking at the numbers, here's what I found (TLDR at the bottom):
First, we need to figure out how Class 3 and 4 Rail Guns would scale based on how the Class 1 and 2's scale. I'll also throw in the Class 2, 3 and 4 Plasma Accelerators to help with this. I end up with the following:
Weapon | Power Draw | Distro Draw | Damage | Thermal Load | Rate of Fire | % Power Increase | % Distro Increase | % Damage Increase | % Thermal Increase | % ROF Decrease |
1D Rail gun | 1.15 | 2.69 | 23.3 | 11.9 | 1.6 | - | - | - | - | - |
2B Rail gun | 1.63 | 5.17 | 41.5 | 20.1 | 1.2 | 29.4% | 48.0% | 43.9% | 40.8% | 33.3% |
2C Plasma Accelerator | 1.43 | 9.67 | 54.3 | 17 | 0.3 | - | - | - | - | - |
3B Plasma Accelerator | 1.97 | 13 | 83.4 | 21 | 0.3 | 27.4% | 25.6% | 34.9% | 19.0% | 0.0% |
4A Plasma Accerlerator | 2.63 | 17.7 | 125 | 24.7 | 0.3 | 25.1% | 26.6% | 33.3% | 15.0% | 0.0% |
Based on the above, it looks like both weapon types have roughly constant scaling between hardpoint sizes - enough to approximate them as constant, at least. Under that assumption and using the scaling values for the Class 2 Rail Gun, here's what I came up with for our theoretical Sidewinder-launching Class 3 and 4 Rail Guns:
Weapon | Power Draw | Distro Draw | Damage | Thermal Load | Rate of Fire | Damage/Second |
1D Rail gun | 1.15 | 2.69 | 23.3 | 11.9 | 1.6 | 37.3 |
2B Rail gun | 1.63 | 5.17 | 41.5 | 20.1 | 1.2 | 49.8 |
(3A Rail Gun) | 2.11 | 7.65 | 59.7 | 28.3 | 0.80 | 47.8 |
(4S Rail Gun) | 2.73 | 11.3 | 85.9 | 39.8 | 0.53 | 45.8 |
So our Doomsday Class 4 Rail Gun will dish out...
... twice the damage of a Class 2. Putting some of this into a pretty chart:
Current 3-PA 2-Rail Meta-De-Lances get most of the damage of our theoretical Class 4 already by using two Long Range Class 2's - 74.7 MJ, accounting for Super Penetrator and Feedback Cascade. The only thing a Class 4 could offer in this setup is a single, stronger Feedback Cascade or Super Penetrator Rail in exchange for another pair of Plasma Accelerators.
And for fun, adding Short Range Blaster to the mix:
SRB | | | | |
Weapon | Damage | Thermal Load | Thermal w/ Experimental | Damage/Second |
1D Rail gun | 40.8 | 15.5 | 6.81 | 65.2 |
2B Rail gun | 72.6 | 26.1 | 11.5 | 87.2 |
(3A Rail Gun) | 104 | 36.8 | 16.2 | 83.6 |
(4S Rail Gun) | 150 | 51.8 | 22.8 | 80.2 |
For reference, a stock 4A Plasma Accelerator deals 125 MJ; an efficient one deals 155 MJs, and SRB'd it would deal 219 MJ.
So no - Class 3 and 4 Rail guns likely won't break anything. At least not any more than everything currently is.
As always, feel free to double-check my numbers to make sure I didn't divide by 0 somewhere.
TLDR:
No. Class 3 and 4 Rail Guns would not be overpowered.