Tiger was longer and roughly 4,100 tons lighter, but it lacked the Queen Elizabeth class's battleship-grade combination of armour, subdivision, and armament. Tiger needed 39 Babcock and Wilcox water-tube boilers working at 235 psi and about 85,000 shaft horsepower to reach 28 knots. Compared with the Iron Duke class, the Queen Elizabeths added only modest length while carrying far more displacement and guaranteeing several extra knots. Their weight came from the strong hull, 15-inch guns, protection, and speed instead of a single design error. The often-imagined ten-gun, 28-knot version would probably have pushed normal displacement from roughly 33,000 tons to about 36,000 to 38,000 tons.
Chapter · 47:07-55:13
Weight was a consequence, not the flaw
Comparisons with Tiger and the Iron Dukes show that the Queen Elizabeths were dense and heavy because they combined battleship protection, 15-inch guns, and greater speed in a short hull.