Wespe-class Gunboat

The ''Wespe''-class gunboats were a class of eleven armored gunboats built for the German (Imperial Navy) in the late 1870s and early 1880s. The class comprised , , , , , , , , , , and . Intended for use as part of Germany's coastal defense plan, the ''Wespe''s were armed with a MRK L/22 gun, which was very large for vessels of their size. They were to support the larger s in the event of war, and were to have operated in shallow coastal waters where larger and more powerful opponents could not pursue them.

The eleven ships saw relatively little active service over the course of their careers in the German fleet. Typically, they were commissioned for brief training exercises through the 1880s and 1890s, and they operated along Germany's North Sea and Baltic Sea coastlines during this period. Between 1909 and 1911, all eleven ships were struck from the naval register and used in other roles, from barges to floating workshops, and in the case of ''Viper'', conversion into a crane ship. Most members of the class were broken up, but ''Salamander'' sank on the way to the scrap yard in 1910; ''Wespe'', which had been converted into a dredger in 1911, sank in a storm in 1926; and ''Hummel'', having been converted into a floating anti-aircraft battery during World War II, was sunk by Allied bombers in the final days of the war in May 1945. ''Viper'' was in use as a crane ship as late as 1970, but her ultimate fate is unknown.

Background

In what is now Germany, the first plans for coastal defense centered on the Prussian Navy's use of monitors, e.g. of about displacement. When the naval mine was developed, the use of such big warships seemed unnecessary. Smaller vessels to defend the mine barriers seemed enough. Nevertheless, in the fleet plan of 1872 created by General Albrecht von Stosch, the new Chief of the Admiralty for the (Imperial Navy) of the recently unified German Empire, a force of seven monitors and two floating batteries was projected. It was initially believed that the German Baltic Sea coast did not require gunboats. Here, all but two of the harbors had parallel moles. These stretched into the sea on both sides of the fairway. With mine barriers and heavy coastal batteries to protect these, it was thought unnecessary to have gunboats to keep the enemy at bay. By the time the ships of the ''Wespe'' class entered service, the naval command realized that gunboats would be needed to defend the Baltic ports, and so several of the ships were stationed in the area.

On the German North Sea coast and the east coast of Schleswig-Holstein the situation was quite different. Here, the Eider, Elbe, Weser, Jade, and Ems exited into shallow waters with many shoals and islands. If the enemy could pass the outer limits of these shallow waters, they could safely anchor and prepare an attack or landing. Vessels defending these areas therefore needed a shallow draft. They also had to defend the local mine barriers. Here, these had to be so far from the coast that they could not to be defended by coastal artillery.

After concluding that on the North Sea coast, monitors of about could be replaced by much smaller vessels, the next question was whether these small vessels should be armored or not. Britain, Denmark, the Netherlands, Sweden and Russia opted for unarmored gunboats such as the British s and the Dutch s. The "unarmored" school of thought proposed small unarmored gunboats with a single heavy gun. It noted that in these circumstances, these boats offered a small target, while their guns could penetrate up to of armor at medium distances. Due to their very shallow draft, these small gunboats could also evade ram attacks. A further advantage was the limited cost of these boats, which of course also meant that one could buy more of these for the cost of larger, armored vessels.

The German Navy looked to the experiences of the Crimean War in 1854–1855 and the American Civil War of 1861–1865, which demonstrated the effectiveness of armored warships. The Germans concluded that an unarmored vessel could only be useful when it was covered by natural heights or a mole. In all other circumstances, it risked swift destruction. The threat by enemy capital ships was of course obvious. A less obvious threat was that posed by steam launches (). These of course had much smaller guns, but these light guns were sufficient to destroy unarmored ships. These light guns were also much more in line with the size of the vessel on which they were mounted. This caused that the launches were way more stable at sea, relating in a far higher chance to hit the target.

Design

Already by 1861, in a memorandum written by General Helmuth von Moltke, the Prussian military had settled on armored gunboats. But the specific type and number of vessels was still to be debated. Over the following decade, a series of proposals was evaluated, which called for at least eight, to as many as eighteen, warships to be built. By 1873, the navy had settled on seven ships, but by 1879, thirteen were to be ordered. These ships were intended to support the operations of the four, much larger s. Those ships were designated "" (sortie corvettes), and were intended to sortie from the major ports to attack a blockading squadron.

After the German Navy opted for armored gunboats, it could issue some specifications for new gunboats. The navy required the use of a gun that could penetrate of armor, even at long distances. In turn, the boats should themselves also be protected 20 cm of armor. The gunboats should furthermore be seaworthy and have a shallow draft. The navy required only a limited speed for the vessels. The basic design, which was completed in 1875, was based on the British ''Ant'' class. Initially, armor plate had to be imported from Britain, which was used to equip the first five ships of the class. But an initiative by Stosch saw the firm Dillinger Hütte expand to produce domestic armor for the last six ships. This was the first time that German warships were fitted with armor plate that had been manufactured in Germany.

At the time, the ''Wespe'' class combined the heaviest gun in the German navy with an armor protection that was comparable to that of many ironclad battleships. It was thought this would allow the boats to engage most enemy capital ships on distances at which most of the enemy's guns could not penetrate the boat's armor. In the coastal area, the shallow-draft boats could then evade again in spite of their low speed. But in practice, the ships proved to be disappointments, as their severe roll badly hampered their stability as a gun platform, meaning that accurate fire was all but impossible in heavier seas. Their armor plate was also quickly surpassed by compound armor, which Dillinger acquired a license to manufacture in 1880. Two further armored gunboats, the , were lighter, carried compound plate, and were armed with smaller guns. The naval historian Lawrence Sondhaus characterizes the ''Wespe'' design as having "generated less controversy than the , but heywere equally ill conceived." David Lyon takes a more positive view, stating that "no doubt they would have been useful vessels in any war off Germany's coast, in their earlier years."

General characteristics and machinery

The ''Wespe''-class gunboats' hulls were made of wrought iron, using transverse iron frame construction. They were long at the waterline and long overall. They had a beam of , a depth of hold of , and a draft of . They displaced as designed and up to at full load. The ships' hull was divided into ten watertight compartments and a double hull on the bottom side that extended for fifty-five percent of its length.

The ships featured a light iron superstructure that served to make the boats more seaworthy. The section before the gun emplacement served as accommodation for the crew. The aft section served as quarters for the officers and non-commissioned officers. Behind the gun, there was a deckhouse, which gave a dry access to the machinery and the officer's quarters. They had no rigging, only a signals mast. The ships had a crew that consisted of three officers and seventy-three to eighty-five enlisted men. While serving as a flagship, an additional three officers and eight enlisted men for a commander's staff would be added.

Steering was controlled via a single rudder. The ships were very unseaworthy; they rolled violently and the gun could not be operated in sea state 4 or higher. The ships tended to take on large quantities of water, and suffered from weather helm. Maneuverability suffered from unpredictability, and once a turn was begun, it was difficult to change course.

Power was provided by a pair of 2-cylinder double-expansion steam engines that drove a pair of four-bladed screw propellers that were wide. The engines were placed in a single engine room, though a watertight bulkhead divided them. Four cylindrical fire-tube boilers provided steam to the engines, and they were vented through a single, tall funnel. The propulsion system was rated to produce a top speed of from , though all members of the class exceeded it by more than a knot, with top speeds ranging from . The ships carried of coal for the boilers, which provided a cruising radius of at a speed of . When speed increased to 10 knots, the range fell to .

Armament and armor

The ''Wespe''s were armed with a MRK L/22 built-up gun on a pivot carriage which put its trunnions above the water. The gun was supplied with a total of thirty-eight shells. It had a range of elevation form -5 degrees to 20 degrees, and a maximum range of . The gun had a limited arc of train, and aiming was primarily accomplished by turning the ship in the direction of the enemy. Because of their shallow draft and flat bottoms, the ''Wespe''-class ships could be run aground on sandbars along the coast, as semi-fixed coastal artillery batteries. The ships also had a ram bow.

Later in their careers, the ''Wespe''s received two L/24 built-up guns and two Hotchkiss revolver cannon. They were also fitted with two torpedo tubes in bow-mounted launchers, submerged below the waterline. Each tube carried a single torpedo.

The armor belt was thick in the central portion. It continued at that same thickness along the whole bow section, but tapered to first to and then to at the stern. A layer of teak that was thick backed the belt armor. This was because the ''Wespe''s were planned to engage the enemy with their bow forward, instead of with the broadside. The gun was placed behind a semi-circular armored barbette of thickness, also backed by 210 mm of teak. The deck of the ''Wespe''s was protected by two layers of thick wrought iron atop a layer of teak. Later in their careers, a small, armored conning tower with thick sides was installed atop the superstructure. Other aspects of its protection scheme were compartmentalization and a double hull, which would limit flooding in the event the hull was penetrated.

Ships

Service history

After commissioning in November 1876, ''Wespe'' conducted sea trials and test shooting of the 30.5 cm gun, before being placed in reserve in March 1877. The rest of the members of the class also commissioned for sea trials after completing construction, before being placed in reserve for the first few years of their careers. The ships saw intermittent periods of training activity in the 1880s and into the 1890s, though not all ships were active at any one time. ''Basilisk'' was the one exception; she was only commissioned very briefly for just two months in 1880 and one month in 1881. In the early 1880s, all members of the class were refitted with the additional guns and torpedo tubes.

In some years, some of the ships were grouped into a flotilla for training maneuvers with other elements of the German fleet. In 1884, for example, ''Biene'', ''Camaeleon'', ''Crocodill'', ''and Hummel'' took part in training exercises in the Baltic. The following year, ''Wespe'', ''Salamander'', ''Viper'', and ''Mücke'' participated in maneuvers in the North Sea with the screw corvette . Through much of this period, ''Mücke'' or ''Crocodill'' served as the flagship, both of the temporarily activated flotillas and also the Reserve Division of the Baltic. ''Mücke'', ''Natter'', ''Crocodill'', and ''Scorpion'' recommissioned briefly in 1900 due to a shortage of warships in Germany, after several major warships were sent to China in response to the Boxer Uprising; they replaced the four s in the annual fleet maneuvers that September.

''Wespe'', ''Viper'', ''Salamander'', and ''Camaeleon'' were struck from the naval register on 28 June 1909; ''Wespe'' and ''Camaeleon'' were used as barges, while ''Viper'' was converted into a crane ship. ''Salamander'' was instead sold to ship breakers, but she sank off the coast of the Netherlands on the way to the scrapyard in November 1910. ''Biene'', ''Basilisk'', and ''Hummel'' were struck on 27 September 1910. ''Biene'' was converted into a floating workshop, and ''Basilisk'' was used for a time as a test ship for hull leakage experiments. ''Hummel'' served in a variety of roles for another thirty years, beginning as a floating workshop. ''Mücke'', ''Natter'', and ''Crocodill'' were struck on 18 March 1911. ''Crocodill'' was used as a target ship, then as a floating workshop beginning in 1913. ''Mücke'' was used in hull leakage tests, and ''Natter'' was renamed ''Stromquelle I'' (Power Source I) for use as a stoker barge in Wilhelmshaven. ''Wespe'' was sold into commercial service and converted into a cutter suction dredger in 1911. In 1918 during World War I, ''Viper'' took part in the salvage operation to refloat the dreadnought battleship , which had run aground off the coast of Finland.

''Crocodill'' was broken up sometime after 1918. ''Basilisk'' was sold to ship breakers in 1919 and dismantled the following year. ''Biene'' and ''Mücke'' were eventually sold in 1921 and were both broken up that year in Wewelsfleth. ''Wespe'', which had been renamed ''H.A.M. III'', sank in a storm off the coast of Australia in 1926. ''Stromquelle I'' was moved to Kiel in 1924 and reverted to the name ''Natter''; she was eventually scrapped there in 1946. ''Hummel'' ended her career as a floating anti-aircraft battery during World War II. In that role, she was sunk by Allied bombers on 4 May 1945. ''Viper'' remained in service the longest, outlasting even ''Hummel'' by more than two decades at least; she remained in active use as a crane vessel at least as late as 1970. After a failed attempt to raise the wreck of ''Salamander'' in 1936, her superstructure was removed to reduce the hazard to navigation. A second attempt in 1980 also failed, and the ship eventually became buried in silt. The ultimate fates of ''Viper'' and ''Camaeleon'' are unknown.

Notes

References

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External links

Models of the class

{{German ironclads

Wespe-class gunboats
Gunboat classes