page_title: Greek ironclad Hydra
section_title: Design
hierarchical_section_title: Greek ironclad Hydra / Design
caption_attribution_description: English: Sketch of the Greek coast defence battleships Hydra class.
context_page_description: Hydra was an ironclad warship of the Greek Navy, named for Hydra, one of the Saronic Gulf islands which played a key role in the war at sea during the Greek War of Independence. The lead ship of her class of ironclads, she was ordered in 1885 in response to a crisis in the Balkans and Ottoman naval expansion. The ship was launched in 1889 and delivered to Greece by 1892. She was armed with a main battery of three 10.8 in guns and five 5.9 in guns, and had a top speed of 17 kn.
  Hydra and her sisters saw heavy service with the Greek Navy. They participated in the Greco–Turkish War in 1897 until the Great Powers intervened and prevented the Greek Navy from capitalizing on their superiority over the Ottoman Navy. Hydra saw action in the First Balkan War at the Naval Battle of Elli and was present at the Naval Battle of Lemnos, but was too slow to actively engage the Ottoman forces. She did not see action during World War I, and was reduced to a gunnery training ship after the end of the war. She was ultimately broken up for scrap in 1929.
context_section_description: Hydra was 334 feet 8 inches (102.01 m) long between perpendiculars and had a beam of 51 ft 10 in (15.80 m) and a mean draft of 18 ft (5.5 m). She displaced 4,808 long tons (4,885 t) as built. She was powered by a pair of marine steam engines of unknown type with steam provided by four coal-fired fire-tube boilers; they were rated at 6,700 indicated horsepower (5,000 kW) and provided a top speed of 17 knots (31 km/h; 20 mph). Coal storage amounted to 500 long tons (510 t).
  Hydra's main battery consisted of three 10.8 in (270 mm) guns in individual mounts. Two guns were mounted forward in barbettes on either side of the forward superstructure; these were L/34 guns. The third gun, a L/28 gun, was placed in a turret aft. The secondary battery consisted of four 5.9 in (150 mm) L/36 guns in casemates were mounted below the forward main battery, and a fifth 5.9-inch gun was placed on the centerline on the same deck as the main battery. A number of smaller guns were carried for defense against torpedo boats. These included four 3.4 in (86 mm) L/22 guns, four 3-pounder guns, four 1-pounder guns, and six 1-pounder Hotchkiss revolver cannons. The ship was also armed with three 14-inch (356 mm) torpedo tubes.
  The ship was armored with a mix of Creusot and compound steel. The main belt was 12 inches (305 mm) thick in the central section and was reduced to 4 inches (102 mm) at either end of the vessel. The main battery barbettes were protected by up to 14 inches of armor. Hydra was fitted with an armor deck that was 1.9 inches (48 mm) thick.
caption: General arrangement drawing of a Hydra class ship
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