and motor generators with capacity of 100 kW. Invincible carried eight BL 12-inch (305 mm) Mk X guns in four twin turrets. For evaluation purposes these
1 in) guns that outranged British 4-inch guns, resulted in the new class's armament being revised. They had two BL 6-inch (152 mm) Mk XI naval guns mounted
use the new BL5.5-inch (140 mm) Mk I gun built by the Coventry Ordnance Works. This weapon was significantly lighter than the standard 6-inch (152 mm) gun
BL 15-inch Mk I guns in three twin hydraulically powered gun turrets, 'A', 'B' and 'Y' from front to rear. Her secondary armament consisted of 17 BL 4-inch