Wacht-class aviso. The  class was a pair of avisos built by the German  (Imperial Navy) in the late-1880s; the class comprised two ships,  and . They were laid down in 1886 and 1887 and completed by 1888 and 1889, respectively. The ships were based on the previous aviso, , which had proved to be an unsuccessful design due to its lack of torpedo armament. As a result, the -class ships were equipped with three torpedo tubes to improve their combat power; they were also the first German avisos to carry armor protection.

Both ships served in the main German fleet for the entirety of their active duty careers. They were primarily employed in the peacetime routine of unit and fleet training maneuvers. In September 1901,  was accidentally rammed by the ironclad  during the annual fleet maneuvers. The collision caused serious damage to  and she quickly sank.  continued in service for another three years, after which she was withdrawn from service and used in various roles over the following sixteen years. She was sold for scrapping in 1920.

Design
The German  (Imperial Navy) had begun building modern, steel-hulled avisos in the 1880s to serve as fleet scouts and to lead flotillas of torpedo boats; the first of these were the two  ships. After General Leo von Caprivi replaced Albrecht von Stosch as the chief of the  (Imperial Admiralty) in 1883, the navy began to take a turn toward the  doctrine, embracing the concept of using small, cheap torpedo boats to defend the country's coast instead of expensive ironclad warships. This strategy found favor in the  (Imperial Diet), which at that time opposed naval spending. Caprivi directed that the next aviso to be built—what became the  class—should be smaller and faster, able to keep pace with the latest torpedo boats.

The resulting ships proved to be disappointments in service: their smaller size rendered them poor sea boats, which was revealed only after they had been completed and conducted sea trials. Additionally, their gun battery was too weak to allow them to effectively engage comparable vessels in other fleets. Both of these defects limited their utility as fleet scouts. The class did introduce some improvements over previous designs, however, including an armor deck and protection for the conning tower, along with electric lighting for the ships.

General characteristics

The -class ships were  long at the waterline and  long overall. They had a beam of  and a maximum draft of  forward and  aft. They displaced  as designed and up to  at full combat load. Their hulls were constructed from transverse steel frames.  and  each had a crew of 7 officers and 134 enlisted men. The ships carried several smaller boats, including one picket boat, one yawl, one dinghy, and one cutter. They were poor sea boats; they rolled and pitched badly and were very wet. They were also not particularly maneuverable vessels.

Machinery
Their propulsion system consisted of two angled 3-cylinder triple expansion engines that each drove a  wide three-bladed screw. Steam for the engines was provided by four coal-fired locomotive boilers trunked into a single funnel amidships. In 1891–1893, new boilers manufactured by Schichau-Werke and the  (Imperial Shipyard) in Wilhelmshaven were installed. The ships were equipped with a pair of electric generators with a combined output of  at 67 volts.

The ships' propulsion system provided a top speed of  and was rated at , though neither ship reached that horsepower in service. They carried up to  of coal, which enabled them to steam for approximately  at . Steering was controlled by a single rudder.

Armament and armor

As built, the ships were armed with three  K L/35 guns placed in single pivot mounts. The guns were supplied with a total of 180 rounds of ammunition and had a range of .  and  also carried three  torpedo tubes, one mounted submerged in the bow and the other two in deck-mounted launchers on the broadside. In 1891, four 8.8 cm SK L/30 quick-firing guns in single mounts replaced the 10.5 cm guns.

The ships were the first German aviso to carry armor: a  thick deck with  thick sloped sides protected the magazines and engine rooms. The conning tower was protected with  of armor plating on the sides and 10 mm on the roof. The coaming around the funnel was  thick. The armor consisted of compound wrought iron. For protection against underwater attack, the hull was divided into twelve watertight compartments below the armored deck and ten compartments above it.

Ships

Service history

 and  served in a variety of roles during their careers.  initially served with the main fleet, and in 1889 she embarked on a major training cruise to the Mediterranean Sea in company with four ironclad warships and the imperial yacht, , for a series of visits by Kaiser Wilhelm II to Greece, the Ottoman Empire, the Austro-Hungarian Empire, and Italy. By the time the ships returned to Germany,  had entered service as a guard ship in Wilhelmshaven, though she escorted Wilhelm II aboard  for another pair of cruises in the North Sea in 1890 and 1891. Both ships also took part in the peacetime routine of training exercises that culminated in major fleet maneuvers every August and September. By 1893,  had begun to serve as a flotilla leader for torpedo boats.  was the first vessel to pass through the Kaiser Wilhelm Canal in March 1895 before the waterway officially opened in June; her passage was a test of the lock system to ensure that it worked properly.

In the mid-1890s, the ships began to operate as avisos with the capital ships of the main fleet; in this role, they served as scouts, relayed signals, and screened them from torpedo boat attacks. In early 1901,  went to Britain as part of the fleet that represented Germany at the funeral of Queen Victoria, but by 11 August, a survey of the ship had determined that she was in poor condition, and so she was removed from service. On 4 September,  accidentally collided with the ironclad  during training exercises. s ram bow badly damaged  below the waterline, causing her to rapidly sink, though her entire crew was safely evacuated.  saw little use; she was struck from the naval register in May 1910 and then used as a torpedo launching platform for torpedo training. She was ultimately sold to ship breakers in 1920.

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