 The Admiral-class ships were designed with four QF four-inch Mark V anti-aircraft guns. They had a maximum depression of -5°and a maximum elevation of 80 °. They fired a 31-pound (14 kg) high explosive shell at a muzzle velocity of 2,387 ft / s (728 m / s) at a rate of ten to fifteen rounds per minute. The guns had a maximum ceiling of 31,000 ft (9,400 m), but an effective range of much less.
