Sachsen-class ironclad

Sachsen-class ironclad
1902 lithograph of SMS Baden
Class overview
Operators:  Kaiserliche Marine
Preceded by: Kaiser class
Succeeded by: SMS Oldenburg
Built: 1875–1883
In service: 1878–1938
Completed: 4
Retired: 4
General characteristics
Displacement:7,635 t (7,514 long tons; 8,416 short tons)
Length:98.2 m (322 ft)
Beam:18.4 m (60 ft)
Draft:6.32 m (20.7 ft)
Propulsion:
  • two 3-cylinder steam engines
  • two four-bladed screws
  • 5,600 ihp (4,200 kW)
Speed:13 kn (24 km/h; 15 mph)
Range:1,940 nmi (3,590 km; 2,230 mi) at 10 kn (19 km/h; 12 mph)
Complement:
  • 32 officers
  • 285 enlisted men
Armament:
  • 6 × 26 cm (10 in) L/22 guns
  • 6 × 8.7 cm (3.4 in) guns
  • 8 × 3.7 cm (1.5 in) guns
Armor:
  • Belt: 203–254 mm (8.0–10.0 in)
  • Deck: 50–75 mm (2.0–3.0 in)

The Sachsen class of armored frigates was a class of four ships built by the German Imperial Navy in the late 1870s to early 1880s. The ships—Sachsen, Bayern, Württemberg, and Baden—were designed to operate as part of an integrated coastal defense network. The ships were intended to sortie from fortified bases to break up an enemy blockade or landing attempt. Armed with six 26 cm (10 in) guns, they were also intended to fight hostile ironclads on relatively equal terms.

Following their commissionings in 1878–1883, the four ships served with the fleet on numerous training exercises and cruises in the 1880s and 1890s. They also participated in several cruises escorting Kaiser Wilhelm II on state visits to Great Britain and to various cities in the Baltic Sea in the late 1880s and early 1890s. In the late 1890s, the four ships were extensively rebuilt; their secondary batteries were modernized and they received upgraded propulsion systems. They were removed from active duty between 1902 and 1910 and relegated to secondary duties. Sachsen and Bayern became target ships while Württemberg became a torpedo training ship. The three ships were broken up for scrap in 1919–1920. Baden was used as a boom defense hulk from 1910 to 1920, when she became a target ship. She survived until 1938, when she was sold for scrapping.

Design

Design work on the Sachsen class began in 1872 and lasted until 1874.[1] The ships were intended to operate in the Baltic Sea as a primary component of an integrated coastal defense system proposed by General Albrecht von Stosch, the Chief of the Admiralty. Stosch designated the ships Ausfallkorvetten (sortie corvettes), denoting their intended use. In the event of war with a superior naval power and the imposition of a naval blockade, the Sachsen-class ships would sortie from fortified bases to attack the blockaders. They also had the task of breaking up landing attempts. The German railway network linked the bases so ground forces could be transferred to the sites of enemy landings.[2]

Their roles imposed several design limitations on the vessels. The vessels were designed to operate in coastal areas, which required a shallow draft in order for them to be able to enter any port on the Baltic seaboard. They also required a heavy armament, in order for them to be able to engage any hostile ironclad on equal terms. Because Stosch envisioned only local deployments for the vessels, they had limited coal stowage, as they could easily replenish their supply.[2]

General characteristics and machinery

Illustration of the Sachsen-class ships

The ships of the Sachsen class were 98.2 m (322 ft) long overall. They had a beam of 18.4 m (60 ft) and a draft of 6.32 m (20.7 ft) forward and 6.53 m (21.4 ft) aft. At the designed displacement, the vessels displaced 7,635 metric tons (7,514 long tons; 8,416 short tons). When the vessels were fully loaded, they displaced between 7,742 t (7,620 long tons; 8,534 short tons) and 7,938 t (7,813 long tons; 8,750 short tons). Their hulls were built with transverse bulkheads and double longitudinal iron frames; iron plating covered teak backing. The ships had sixteen watertight compartments and a double bottom that ran for 60 percent of the length of the hull.[3]

The German navy regarded the ships as poor sea boats, with severe rolling, and a tendency to take on water. The ships had a very small turning radius, however, and were quick to answer commands from the helm. Their standard complement consisted of 32 officers and 285 enlisted men, and while serving as a division flagship, this could be augmented by an additional seven officers and thirty-four sailors. After their reconstruction in the 1890s, the ships' crews were significantly increased, to 33 officers and 344 enlisted men, and later to 35 officers and 401 enlisted men. The ships carried a number of smaller boats, including one picket boat, one launch, one pinnace, two cutters, one yawl, and one dinghy.[4]

The four ships were powered by two 3-cylinder single expansion engines. The ships' engines drove a pair of four-bladed screws that were 5 m (16 ft) in diameter. The engines were supplied with steam by eight coal-fired trunk boilers. The eight boilers were trunked into four funnels arranged in a square amidships. This arrangement led to the ships being nicknamed Zementfabriken (cement factories). Three generators provided 69 kilowatts of electrical power at 65 volts. The ships' designed speed was 13 knots (24 km/h; 15 mph), at 5,600 indicated horsepower (4,200 kW). All four ships exceeded this speed on trials by between one half to one knot. The ships were designed to store 420 t (410 long tons; 460 short tons) of coal, though they could be modified to carry up to 700 t (690 long tons; 770 short tons). The ships could steam for 1,940 nautical miles (3,590 km; 2,230 mi) at a cruising speed of 10 kn (19 km/h; 12 mph). At maximum speed, the ships' ranges were reduced to 700 nmi (1,300 km; 810 mi).[3] The four Sachsen-class ships were the first large, armored warships built for the German navy that relied entirely on engines for propulsion.[5]

Armament and armor

Diagram showing the layering of the ships' armor

The Sachsen-class ships were armed with six 26 cm (10 in) L/22 guns mounted in two armored barbettes, one forward and one amidships. Two guns were placed in the forward barbette and four were mounted in the amidships position. These guns were supplied with 480 rounds of ammunition. They could depress to −7° and elevate to 16.5°; this enabled a maximum range of 7,400 m (24,300 ft). The ships were also equipped with six 8.7 cm (3.4 in) L/24 guns and eight 3.7 cm (1.5 in) Hotchkiss revolver cannons.[4][6] After 1886, three 35 cm (14 in) torpedo tubes were installed on each ship; one tube was placed in a swivel mount in the stern and two were placed in the bow, submerged. The tubes were supplied with a total of 12 torpedoes. Later, a pair of 45 cm (18 in) torpedo tubes were mounted in the ships' hulls above water on the broadside.[4]

The ships' armor was made of wrought iron and backed with teak. The armored belt was composed of four alternating layers of wrought iron and teak. The outer iron layer was 203 mm (8.0 in) thick amidships, backed with 200 mm (7.9 in) of teak. The inner iron layer was 152 mm (6.0 in) thick and was backed with 230 mm (9.1 in) of teak. It was capped with 254 mm (10.0 in) thick bulkheads on either end of the belt. The thickness of the deck armor ranged from 50 to 75 mm (2.0 to 3.0 in). The forward conning tower had 140 mm (5.5 in) thick sides, though after their modernization, this was increased to 200 mm (7.9 in) thick sides and a 50 mm (2.0 in) roof was added. A rear conning tower was also added, with only splinter protection: 15 mm (0.59 in) thick sides and a 12 mm (0.47 in) thick roof. The barbettes for the main battery guns had 254 mm of wrought iron backed with 250 mm of teak.[1]

Construction

The launching of Bayern

Sachsen, the first ship of the class, was laid down at the AG Vulcan shipyard in Stettin in 1875, under construction number 74. The ship was launched on 21 July 1877 and commissioned into the fleet on 20 October 1878. AG Vulcan also built Württemberg, which was laid down in 1876 under construction number 78. She was launched on 9 November 1878 and commissioned for service on 9 May 1881.[4]

Bayern was actually the first ship to be laid down; work on her keel began in 1874 at the Imperial Dockyard in Kiel, under construction number 3. She was not launched until 13 May 1878, nearly one year after her sister Sachsen. She was commissioned on 4 August 1881, rendering her the third ship of the class to enter service. Baden was the fourth and final ship of the class; she was laid down at the Imperial Dockyard in Kiel in 1876. She was launched on 28 July 1880 and commissioned into the fleet on 24 September 1881.[4]

The ships built by AG Vulcan—Sachsen and Württemberg—were completed in three and five years, respectively. The two vessels built by the Imperial Dockyard—Bayern and Baden—, required eight and seven years' work, respectively. One of the primary causes for the great disparity in build times was the experience of the shipbuilders. AG Vulcan was an established commercial ship builder, while the Imperial Dockyards were recently founded and still lacked experience in large warship construction.[7]

Service history

Bayern in 1889

Though Sachsen entered service in 1878, she only participated in one annual fleet exercise, in 1880, before all four ships were assigned to the 1884 maneuvers. This was due to the poor performance of Sachsen in the 1880 maneuvers and the negative reputation of the class.[8] Among the problems associated with the Sachsen-class ships was a tendency to roll dangerously due to their flat bottoms, which greatly reduced the accuracy of their guns. The ships were also poorly armored, compared to their contemporaries. In addition, they were slow and suffered from poor maneuverability.[9] The four ships served rotations with the fleet for the next two years, though in 1886, all four were demobilized as the Reserve Division in the Baltic.[10] Aside from the Sachsen‍ '​s half-sister Oldenburg, the German Navy took a hiatus on capital ship building until the late 1880s when the first of the Siegfried-class coastal defense ships were laid down.[11] The poor performance of the sortie corvettes, coupled with the rise of the Jeune École, led Leo von Caprivi to abandon capital ship construction in favor of torpedo boats.[12]

The ships were reactivated for a number of ceremonial duties in the late 1880s, including for the dedication of the Kaiser Wilhelm Canal in June 1887 and a tour of the Baltic by the recently crowned Kaiser Wilhelm II in 1888.[13] In the 1890s, all four ships returned to active service with the fleet, serving in the I Division until the middle of the decade, when the new Brandenburg-class battleships began entering service. The four Sachsens were then displaced to the II Division.[14] In the late 1890s, all four of the ships were extensively reconstructed; their secondary armament was modernized and their propulsion systems were rebuilt with new machinery, which increased their speed.[4]

The four ships remained with the fleet until shortly after the turn of the century. Sachsen was removed from duty in 1902 and used as a target ship from 1911 to 1919. Bayern was stricken from the naval register in February 1910 and similarly used as a target vessel until 1919. Württemberg was converted into a torpedo training ship in 1906, equipped with seven 45 cm (18 in) torpedo tubes in a variety of different mountings. She served in this capacity until 1919, when she was used briefly as an escort for F-boats. All three ships were broken up for scrap between 1919 and 1920. Baden survived longest, serving as a boom defense hulk after 1910 and a target ship after 1920. She remained in the German Navy's inventory until 1938, when she was sold for scrapping.[4]

Notes

  1. ↑ 1.0 1.1 Gröner, p. 7.
  2. ↑ 2.0 2.1 Sondhaus, p. 113.
  3. ↑ 3.0 3.1 Gröner, pp. 7–8.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Gröner, p. 8.
  5. ↑ Hovgaard, p. 111.
  6. ↑ Gardiner, p. 245.
  7. ↑ Gardiner, p. 244.
  8. ↑ Sondhaus, p. 161.
  9. ↑ Sondhaus, pp. 135–136.
  10. ↑ Sondhaus, pp. 162–163, 171.
  11. ↑ Gröner, pp. 8–10.
  12. ↑ Sondhaus, pp. 160–165.
  13. ↑ Sondhaus, pp. 171, 177.
  14. ↑ Sondhaus, pp. 194–198.

References

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