Board Thread:Off Topic/@comment-27144409-20160125035940/@comment-27144409-20171013174857

Yes, but to make high rate of fire 150 mm cannons the standard AA defense, would still be excessive. Considering the airspeed of Grimm, and the lack of major military forces, you'd be better off with more numerous, faster firing, lower caliber guns. Even on a battleship, 150mm is a caliber ill suited to AA except for maybe other large airships and giant Nevermores.

I50mm for AA is a fairly poor choice, particularly if it's the main AA caliber.