High Quality Content by WIKIPEDIA articles! The N3 class was a dreadnought battleship class designed for the Royal Navy after World War I, incorporating all the lessons learned from that conflict. They were very similar in design to the G3-class battlecruisers, but had larger guns and thicker armour. They were never ordered due to signing of the Washington Naval Treaty in 1922, which limited the size and armament of battleships to 35,000 long tons (36,000 t) tons and no gun bigger than 16 inches (406 mm).