Comments by "William Cox" (@WildBillCox13) on "H-40 through H-44 - Guide 111 (NB)" video.
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Interesting that both Germany and Japan had access to 40mm guns for AA duty. The Kriegsmarine had a production line in place for the Bofors 40mm gun. Indeed, the Prinz Eugen's final outfit replaced the "37"s with 40mm Bofors guns. As for the IJN, it had access to both double and octuple Pom pom mounts, in the main captured from the British. These would've been superior to the silly little Hotchkiss type 25mm we all laugh at from the safety of an 80 year gap.
Moving into a more specious fantasy scenario, the 5cm FlaK41/L65, which had problems of flash and vibration precluding its adoption as a general FlaK service weapon, would not have been out of place on the German capital ships. With Rates of Fire similar to the Bofors gun, but much harder hitting, and with longer effective range, this weapon might've been able to keep allied torpedo planes at bay. Powered mounts for shipboard use would solve its vibration troubles and centralized direction would eliminate the flash problems. Moreover, the excessive smoke obscuration would be solved by the simple fact that ships move, while ground mounts sit still, wreathed in the byproducts of their use.
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