The casemate armour was also 180 millimetres (7.1 in) thick. The upper armour belt had a maximum thickness of 180 millimetres (7.1 in), but it thinned to 110 millimetres (4.3 in) from the forward barbette all the way to the bow. It was continued to the bow by a small patch of 110–130-millimetre (4–5 in) armour. The waterline armour belt of Tegetthoff measured 280 millimetres (11 in) thick between the midpoints of the fore and aft barbettes and thinned to 150 millimetres (5.9 in) further towards the bow and stern, but did not reach either the bow or the stern. Four 530-millimetre (21 in) submerged torpedo tubes were fitted, one each in the bow, stern and on each broadside twelve torpedoes were carried. Three more 66-mm K 10 guns were mounted on the upper turrets for anti-aircraft duties. Eighteen 70-millimetre (3 in)/50 K 10 guns were mounted on open pivots on the upper deck above the casemates. Her secondary armament consisted of twelve 150-millimetre (5.91 in)/50 K 10 guns mounted in casemates amidships. Her armament consisted of twelve 305-millimetre (12 in)/45- caliber K 10 guns in four triple turrets. At full capacity, she could steam for 4,200 nautical miles (7,800 km) at a speed of 10 knots (12 mph 19 km/h). She carried 1,844.5 tonnes (1,815.4 long tons) of coal, and an additional 267.2 tonnes (263.0 long tons) of fuel oil that was to be sprayed on the coal to increase its burn rate. The turbines were designed to produce a total of 27,000 shaft horsepower (20,134 kW), which was theoretically enough to attain her designed speed of 20 knots (23 mph 37 km/h), but no figures from her speed trials are known to exist. The turbines were powered by twelve Babcock & Wilcox boilers. The propulsion consisted of four Parsons steam turbines, each of which was housed in a separate engine-room. She displaced 20,000 tonnes (19,684 long tons) at load and 21,689 tonnes (21,346 long tons) at deep load. The ship had an overall length of 152 metres (498 ft 8 in), a beam of 27.9 metres (91 ft 6 in), and a draught of 8.7 metres (28 ft 7 in) at deep load. Following her fitting out, she was commissioned into the Austro-Hungarian navy on 14 July 1913. Following a year and a half of construction, Tegetthoff was launched on 21 March 1912. The keel of Tegetthoff was laid down in Stabilimento Tecnico Triestino shipyard in Trieste on 24 September 1910. She was the second battleship of the class that shared her name to be built, the first dreadnoughts of the Austro-Hungarian Navy. Tegetthoff was ordered by the Austro-Hungarian Navy in 1908. Main article: Tegetthoff-class battleship

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