When did small-tube oil boilers become viable for warships?
Short answerReliable viability arrived around 1913-1914, with earlier British interest constrained more by industry confidence than by total technical impossibility.
NotesSmall-tube oil boilers were clearly viable for major warships by 1913-1914, though British designers had shown interest earlier. Their development could change capital-ship layout, speed, and alternate design paths before and during World War I.