Hi ezgo,
To be honest, I think this particular ship is going to have to exceed that because of the fire rate of the Doras. I doubt it's going to be as slow as the land based version's 14 shots per day, but even firing at battleships it's going to struggle to keep up, surely? Don't take my word as gospel or anything, but I'd think, for a design like this, you'd want:
"Superheavy" - 800mm. Main battery. Quite what you'd shoot with it, I do not know.
"Secondary" - this would be anybody else's main battery. For the KM, I'd figured 283mm, it seemed to be quite a good, long-range gun, no need to step up to 15/16 inch weapons because for anything really big, you've got main battery.
"Tertiary" - anything for which the secondaries would be a waste (or needs the higher rate of fire). The KM seemed quite happy with the 150mm, I figure they'd keep that here. Anti-destroyer gun.
"AA" - Again, because it's the germans, you've either got actual in-use stuff like the 105mm or 88mm (though I can't see them using the 88 if they've got the 105mm available) or using the 128mm flak from flak towers. If you're using the 128mm, though, you'd have to ask why not go for a proper DP battery like most other nations. In real life, I understand it's because the KM placed a premium on being able to knock out RN destroyers at longer ranges, which favoured the 150mm, which doesn't make a good AA gun, so they went for a full-on AA gun for that role. Could go with a dual-purpose battery, I suppose, if we're not placing as high a weight on countering destroyers for this ship.
For what it's worth, I figured for the first couple of salvos off the Dora - if you're engaging anything heavy, that is - maybe go with HE rather than AP and try and blind your opponent. With the size of shells that gun fires, you must be able to get plenty of blast and fragmentation from it, maybe enough that even if you bracket the target you still trash radars \ optics and put out their eyes before it gets so close the Dora becomes more of a problem?
Anyway, if all of the above sounds like desperate rationalisation in an attempt to find
some use from an H45, you're right
Regards,
Adam Smith
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