| Main Armament: |
Twelve 30.5 cm quick firing guns of 50 calibres length, arranged in six
double gun turrets, one each bow and stern, two on each beam.
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Secondary and
Tertiary Armaments: |
Fourteen 15 cm quick firing guns of 45 calibres length in casemates, number
reduced to twelve from about 1916-17. Two 88 mm single mount anti-aircraft
guns mounted from 1914. Six 50 cm torpedo tubes arranged one each bow and
stern, two on each beam, all underwater.
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| Armor: |
Armoured traverse bulkheads: stern/90mm, vital parts/235-300/mm, bow/235mm
...Side armour: from stern to bow, 0-120-300 (tapered upwards to 170)-120-0 all
dimensions in mm...Citadel armour: from stern to bow, 0-100-170-120 all dimensions
in mm...Horizontal armour: armoured deck 55mm with 80mm inclines...Heavy guns:
barbettes/270mm, turrets-front/300mm, sides/250mm, top/170-100mm...Casemates:
80-170mm...Conning tower: front/400mm, rear/200.
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| Machinery: |
Fifteen naval boilers feeding three, four cylinder, triple expansion
reciprocating engines. Output of 28,000 i.h.p. at 20.0 knots.
Supplementary oil firing added 1915, with 197 tons normal reserves.
Three propellers, two parallel rudders. Trial run results: HELGOLAND
20.8 kn/31,258 ihp; OSTFRIESLAND 21.2 kn/35,500 ihp; THÜRINGEN
21.0 kn/34,944 ihp; OLDENBURG 21.3 kn/34,394 ihp.
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