If the Queen Elizabeths used small-tube boilers for 28 knots, would the Revenge class remain 21-knot ships?
Short answerProbably not; the Royal Navy would be strongly tempted to build the Revenge class for the same 28-knot battle line.
NotesIf the Queen Elizabeths reached 28 knots, the pressure to build the Revenge class for the same speed would become strong. Fourteen 15-inch-gun battleships capable of roughly 28 knots in the 1914-16 period would outpace contemporary battle lines and even some battlecruisers, transforming the Royal Navy's tactical position.