such as the 10.5 cm SK C/33 twin mounts carried on the German battleships and . Ship classes Ships with QF 5.25 inch Mark I guns: s s Land service In early 1942 the Governor of Gibraltar sought 5.25-in guns for dual anti-aircraft/coast defence role. None was forthcoming. However, later that year Anti-Aircraft Command in UK acquired three twin-gun turrets from the Admiralty, which were installed around London in permanent positions. Trials and use led the army to design a single gun mounting in two marks, both with an underground engine room to provide electrical and hydraulic power for traverse, elevation, fuze setting, ramming and other tasks. Fitted with the standard army Machine Fuze Setter No 10, these guns had a rate of fire of 10 rds/min and a maximum height of 50,000 ft, with an effective height of 36,000 ft. Mark 1A was a mild steel turret for anti-aircraft use only, Mk 1B was an armoured turret for anti aircraft and coast defence use. The gun was designated Mk 2. By the end of 1943 only 16 of the new guns had been installed, far below projections. By the end of the war 164 guns had been produced. The high-explosive shells were fuzed with the standard army No 208 mechanical time fuze, used with 3.7 and 4.5-inch anti-aircraft guns. The guns remained in service after World War II, and in 1953 11 guns were installed in Gibraltar. Late in World War II, seven guns were mounted in Australia and three in New Guinea, in enclosed single-gun anti-aircraft/coast defence turrets. Specifications Bore Diameter: 5.25 inches (133 mm) Barrel Length: 6.668 m (50 calibres) Shell weight: 80 lbs (36.3 kg) Range: 24,070 yds (22,000 m) at 45 degrees Anti Aircraft Ceiling: 46,500 ft (14,170 m) Rate of Fire: Sustained 7–8 rpm, 18 RPM claimed for HMS Vanguard. Penetration: side armour: 3 inches (76 mm) 9,500 yards (8,690 m) or 11,900 m, depending on the sources; the gun was not capable of penetrating 2 inches (51 mm) of deck armour at any range Mounting weight: 78.7 metric tons (varied) Mounting elevation: -5 to +70 degrees Training & elevating speeds: 10 degrees per second and 20 degrees per second respectively, in RP10 mounts. Ammunition Surviving examples Princess Anne's Battery remains overlooking the sea at Gibraltar a turret originally from PNS Babur (ex ) is at the gate of Pakistan Navy Headquarters in Karachi