Wartime radar and additional 40 mm weapons raised topweight on ships that had not reserved enough stability margin. The Dido class was especially vulnerable because it packed a destroyer-like arrangement tightly into a cruiser hull. The Tribal class reversed that relationship by placing a cruiser-like gun layout on a destroyer hull, leaving somewhat more room to absorb additions. Nominal ship size alone does not determine how readily a design accepts wartime modernization.
Notable Point · 1:56:48-1:58:01
Why Didos struggled with topweight more than Tribals
A layout comparison explains why wartime radar and light-AA additions strained Dido-class cruisers while Tribal-class destroyers retained more useful margin.