Design
Regina Margherita was 138.65 meters (454.9 ft) long overall and had a beam of 23.84 m (78.2 ft) and a draft of 8.81 m (28.9 ft). She displaced 14,093 metric tons (13,870 long tons; 15,535 short tons) at full combat load. Her propulsion system consisted of two triple expansion engines. Steam for the engines was provided by twenty-eight coal-fired Niclausse boilers. The ship's propulsion system provided a top speed of 20.3 kn (37.6 km/h; 23.4 mph) and a range of approximately 10,000 nautical miles (19,000 km; 12,000 mi) at 10 kn (19 km/h; 12 mph). Regina Margherita had a crew of 812 officers and enlisted men.
As built, the ship was armed with four 12 in (300 mm) 40-caliber guns placed in two twin gun turrets, one forward and one aft. The ship was also equipped with four 8 in (200 mm) 40-cal. guns in casemates in the superstructure, and twelve 6 in (150 mm) 40-cal. guns, also in casemates in the side of the hull. Close-range defense against torpedo boats was provided by a battery of twenty 3 in (76 mm) 40-cal. guns. The ship also carried a pair of 47 mm (1.9 in) guns, two 37 mm (1.5 in) guns, and two 10 mm (0.39 in) Maxim guns. Regina Margherita was also equipped with four 17.7 in (450 mm) torpedo tubes placed in the hull below the waterline. Regina Margherita was protected with Harvey steel manufactured in Terni. The main belt was 6 in (150 mm) thick, and the deck was 3.1 in (79 mm) thick. The conning tower and the casemate guns were also protected by 6 in of armor plating. The main battery guns had stronger armor protection, at 8 in (200 mm) thick.
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