No-go upgrades ?

[CaptBeefheart]

On the Allied side there's a Fletcher upgrade where you lose half of your torpedoes but gain quite a bit of AA. There are probably similar upgrades with other DD classes. At that point, you have to assess the likelihood of surface actions vs. air attack. If the IJN still has a decent surface fleet you might postpose those upgrades.

Another thing to note is for your Liberty ships I believe in May 1943 (or thereabouts) you lose the option to convert them from xAK to xAP. Usually it's useful to convert as many as possible by that time as a lot more unconvertible xAKs will show up later.

Cheers,
CB

[Lokasenna]

ORIGINAL: CaptBeefheart

On the Allied side there's a Fletcher upgrade where you lose half of your torpedoes but gain quite a bit of AA. There are probably similar upgrades with other DD classes. At that point, you have to assess the likelihood of surface actions vs. air attack. If the IJN still has a decent surface fleet you might postpose those upgrades.

Another thing to note is for your Liberty ships I believe in May 1943 (or thereabouts) you lose the option to convert them from xAK to xAP. Usually it's useful to convert as many as possible by that time as a lot more unconvertible xAKs will show up later.

Cheers,
CB

June 1943 is when it occurs, and the ships that arrive in June 1943 are already 6/1943 Liberty class, so do not have the ability to convert.

I also convert every single one that arrives before then. It means I am somewhat short on xAKs in the eastern Pacific until late 1943, but it's better than not having enough xAPs later in the war.