Factorio Forums

Summary

Railguns are currently severely firerate constrained by their animation, and in combat conditions will fire at approximately 1/6th of their nominal maximum firing speed, or 0.13 shots per second.


More detail

The railgun has a default firing speed of 0.5 shots per second, and with upgrades it is capped at 0.86 shots per second. While it is a known issue that the firerate caps at 0.86/s despite the infinite research, the issue goes far beyond that.

Using the map editor, I created a simple series of tests to explore the maximum firing rate. With stacked spawners creating targets for railguns to shoot, I tested two scenarios.
First, I positioned spawners so that spawned biters don't move much, allowing a railgun to fire along the same angle constantly and with no shortage of targets.
Second, I placed a large area with a array of railguns and constantly moving targets, simulating a chaotic battlefield or asteroid field for a more realistic figure for firerate. I ensured that railguns consistently have a target somewhere within their field of view, so they are never simply idling.

I waited 10 minutes, and used the production graph to find the average firerate per turret over that time period.



Results

Max research, min animations: 42 per minute, 0.7/s, or 81% of listed firerate
No research, min animations: 21 per minute, or 0.35/s, or 70% of listed firerate
Max research, realistic: 8.3 per minute, 0.138/s, or 16% of listed firerate
No research, realistic: 7.9 per minute, 0.132/s, or 26% of listed firerate


As you can see, even in the absolute best case scenario, railgun turrets only achieve about three-quarters of their nominal firing rate. In the worst case, the actual firing rate is on the order of one sixth.

This is a severe nerf to the viability of using railguns on space platforms, and it's very evident in-game; platforms intending to approach the shattered planet are forced to slow to a crawl. Railguns cannot consistently hit huge asteroids at high speed, even if you line the entire front of the platform with them and have endless railgun ammo available.


Conclusion

The animation of railguns severely hampers their effectiveness in certain situations. I would recommend either speeding up the animation significantly, or reworking how the animation works so that the turret will always fire at the advertised rate regardless of the animation state or apparent aiming position.

I have attached my testing map to this post. You will need to switch forces to see the consumption graph for different railgun groups.


Edit: Fixed a figure that was swapped

Yeah I noticed also. Hopefully a fix comes soon. I unfortunately spent several million science on it before I realised the shooting speed wasn't getting any faster at all.

A possible solution is to change the inner workings of the raigun to make it simply shoot (after selecting a target and rotating to it), regardless if the target still exists at the moment the shot should be fired. (so the decision to fire a shot is irreversible the moment the railgun selects a target and starts rotating to it). This solves the situation for the prometheum deep field asteroid area, as at some point simploy shooting becomes more important and aiming becomes less of a "neccesaty"

To me it looks like the railguns seem to "fight" over who gets to shoot the target a lot (I tried out endless amounts of target prio to stop the "arguing" with very minor improvements only), so they rotate to an angle to fire, but then don't fire, rotate to a different angle to fire, then don't fire, etc. This problem actually becomes WORSE if MORE targets become available! When increasing the ships speed, railgun ammo consumption goes DOWN instead of up, by a lot!

Personally I'm fine with the hard limit of 0,86/s for the turrets, as they may become too OP quickly otherwise, but they should be able to actually FIRE 0,86/s. Personal (and less rigorous than OP) test results are the railguns shooting speeds (at 2M km out) are approximately

- 0,21/s when 0,86/s is researched (@150 km/s (with grossly, order-of-magnitude amounts of unsustainable ammo consumption for the other turrets)
- 0,29/s when 0,86/s is researched (@100 km/s (still way too large ammo consumption for the other turrets)
- 0,39/s when 0,86/s is researched (@35-40 km/s (with sustainable ammo consumption across the board)

So at sustainable speed, railguns shoot less than half as much as promised, at higher speed this drops to about 25% of the displayed shooting rate.

PS I used rare quality railguns for all of the above data.

Also see 116987 Railgun turrets do not obey railgun speed upgrades.

Muche wrote: ↑Tue Nov 19, 2024 6:31 pm Also see 116987 Railgun turrets do not obey railgun speed upgrades.

The 0.86/s upgrade limit is a different matter entirely

That topic is about railguns' designed top firing speed of 0.86/s due to animation.
This topic is about railguns not able to reach the designed top firing speed of 0.86/s due to animation.
Yes, they are not duplicates, but they are related.