I think this is an interesting question. Naval AA do two this, shoot down Aircrafts and reduce damage Aircrafts deal on your ship.
According to the wiki, only the ship attacked will have a chance to shoot against the Aircrafts (so AA cruisers is maybe not a good idea). Chance to hit is around 27% to 20% depending on the Aircraft's agility, higher agility reduce hit rate somewhat.
Only if a hit is rolled while a number of Aircrafts be shoot down, so about only 1/5 or 1/4 attacks will lead to Aircrafts being shoot down.
The number of Aircrafts shoot down is a % of the total attacking Aircrafts and that % is between 0 and AA value of the attacked ship. On a hit you can expect AA value/2 % Aircrafts shoot down
So Assuming 25% chance to hit, we can expect this % of Aircrafts shoot down for different AA values:
The second part is damage reduction, here 20% of each ship contribute to the damage reduction. Using the formula, we get the following damage reduction from AA value (how much fleet AA value need)
So the conclusion seems to be that AA is not Worth to focus on as the damage reduction, while nice on require a rather modest investment to gain half the reduction while the number of Aircrafts expect to be shoot down is really few and Aircrafts are quite cheap. A better investment is to invest the resources into being stuff that kills ships and use dual purpose guns to gain the damage reduction bonus.
If I got to make some Changes, I would probably remove the chance to hit and instead just focus on the second part which roll the amount of Aircrafts AA kills, it feels to binary and not realistic. Also I would also try to find a way for non attack ships to shoot down Aircrafts as of right now, stuff like AA crusiers don't make much sense as screens are seldom attack by Aircrafts.
Right now I feel these things are bit off:
US naval AA shoot down around 30% of the Aircrafts that entered its range or over 2k with about 1k destroyed by fighters, however even with a very extreme focus on AA you can't expect anywhere near those numbers. In one case a single US destroyer shoot down like 9 attacking Aircrafts if remember correctly and probably damage more, in game the destroyers wont do even shoot at the Aircrafts. The battleship South Dakota was credited for shooting down 26 Aircrafts in one battle (however this may be exaggerated).
If you worry about Aircrafts, the by far best way is to keep your navy out of range of naval bombers, and operate in areas in which you can provide air cover.
According to the wiki, only the ship attacked will have a chance to shoot against the Aircrafts (so AA cruisers is maybe not a good idea). Chance to hit is around 27% to 20% depending on the Aircraft's agility, higher agility reduce hit rate somewhat.
Only if a hit is rolled while a number of Aircrafts be shoot down, so about only 1/5 or 1/4 attacks will lead to Aircrafts being shoot down.
The number of Aircrafts shoot down is a % of the total attacking Aircrafts and that % is between 0 and AA value of the attacked ship. On a hit you can expect AA value/2 % Aircrafts shoot down
So Assuming 25% chance to hit, we can expect this % of Aircrafts shoot down for different AA values:
- 10 AA = 1.25%
- 20 AA = 2.5%
- 30 AA = 3.75%
- 40 AA = 5%
- 50 AA = 6.75%
The second part is damage reduction, here 20% of each ship contribute to the damage reduction. Using the formula, we get the following damage reduction from AA value (how much fleet AA value need)
- 10 (50) = 24%
- 100 (500) = 38%
- 200 (1000) = 43%
- 300 (1500) = 47%
- 400 (2000) = 49%
- About 420 (2080) the cap of 50% damage reduction is reached
So the conclusion seems to be that AA is not Worth to focus on as the damage reduction, while nice on require a rather modest investment to gain half the reduction while the number of Aircrafts expect to be shoot down is really few and Aircrafts are quite cheap. A better investment is to invest the resources into being stuff that kills ships and use dual purpose guns to gain the damage reduction bonus.
If I got to make some Changes, I would probably remove the chance to hit and instead just focus on the second part which roll the amount of Aircrafts AA kills, it feels to binary and not realistic. Also I would also try to find a way for non attack ships to shoot down Aircrafts as of right now, stuff like AA crusiers don't make much sense as screens are seldom attack by Aircrafts.
Right now I feel these things are bit off:
- Damage reduction is very favorable for a tooken investment in AA but unfavorable for massed AA
- Only the attacked ship will actually shoot down aircrafts at a very low chance to even hit, most attacks will have no aircaft losses no matter the AA score of the ship
- The specalized AA module is expensive as it increase total cost of the ship by 2% which may make it more expensive than the dual purpose gun, which is superior to it as it also provide light gun attacks while the extra AA from the AA module hardly seems to matter.
- The quality of aircrafts don't matter if the AA land a hit, it will in such case shoot down as many 1944 aircrafts as 1936 aircrafts (but it will hit 1944 aircrafts somewhat less often).
US naval AA shoot down around 30% of the Aircrafts that entered its range or over 2k with about 1k destroyed by fighters, however even with a very extreme focus on AA you can't expect anywhere near those numbers. In one case a single US destroyer shoot down like 9 attacking Aircrafts if remember correctly and probably damage more, in game the destroyers wont do even shoot at the Aircrafts. The battleship South Dakota was credited for shooting down 26 Aircrafts in one battle (however this may be exaggerated).
If you worry about Aircrafts, the by far best way is to keep your navy out of range of naval bombers, and operate in areas in which you can provide air cover.
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