What single change would most improve Fisher's battlecruiser line with hindsight?
Short answerAdopt triple turrets and broader hulls, gaining heavier broadsides, better conversion potential, and larger supporting infrastructure.
NotesChanging the turret arrangement alters beam, length, weight distribution, and the infrastructure needed to build and support the ships. Renown and Repulse become nine-gun ships rather than six-gun ships, while Hood becomes a twelve-gun design. Broader hulls would also be better starting points for later carrier conversion. The larger ships would force investment in docks and yards capable of handling them. One armament decision therefore propagates through firepower, hull form, conversion potential, and the industrial base available for later construction.