What is the main difference between a super-dreadnought and a 1940s fast battleship?
Short answerGreater machinery power density, revised armor layout, and much better fire control.
NotesPropulsion is the first major difference. Later boilers and engines produce much more power for their weight and volume, enabling speed that an earlier super-dreadnought plant could not economically supply. Armor distribution also changes as designers respond to longer engagement ranges and new threats. Improved fire control completes the shift by letting the ship exploit its guns and mobility more effectively.