SMS Hela

From Wikipedia, the free encyclopedia

Preceded byMeteor class
SucceededbyGazelle class
Completed1
Lithograph of Hela in 1902
Class overview
Operators Imperial German Navy
Preceded byMeteor class
Succeeded byGazelle class
Completed1
Lost1
History
German Empire
NameHela
BuilderAG Weser, Bremen
Laid downDecember 1893
Launched28 March 1895
Commissioned3 May 1896
FateSunk, 13 September 1914
General characteristics (as built)
TypeAviso
Displacement
Length105 m (344 ft 6 in) overall
Beam11 m (36 ft 1 in)
Draft4.64 m (15 ft 3 in)
Installed power
Propulsion
Speed20 knots (37 km/h; 23 mph)
Range3,000 nmi (5,600 km; 3,500 mi) at 12 knots (22 km/h; 14 mph)
Complement
  • 7 officers
  • 171 enlisted men
Armament
Armor
  • Deck: 20 to 25 mm (0.79 to 0.98 in)
  • Conning tower: 30 mm (1.2 in)

SMS Hela was an aviso built for the German Kaiserliche Marine (Imperial Navy) in the mid-1890s, the last vessel of that type to be built by the German Empire. As the culmination of the type in German service, she represented significant improvements over earlier vessels, particularly the Wacht and Meteor classes, which had been disappointments in service. She was intended to serve as a fleet scout and as a flotilla leader for torpedo boats. Hela marked a step toward the development of the light cruiser. Armed with a battery of four 8.8 cm (3.5 in) guns and three 45 cm (17.7 in) torpedo tubes, the ship proved to be too weakly-armed for front-line combat.

Hela had a relatively short active career; engine damage during sea trials shortly after her completion in 1896 delayed the start of her service with the fleet until 1898. She served as a scout for I Squadron from then until 1900, when she was deployed as part of an expeditionary force to help suppress the Boxer Uprising in Qing China. Hela saw little action during the deployment, instead frequently patrolling the coast of China and the Yangtze river. After returning to Germany in mid-1901, she served with I Scouting Group and the main fleet until late 1902, when she was reduced to a gunnery training ship, though boiler problems forced a more thorough reconstruction that lasted from 1903 to 1910.

The ship was used as a tender for the fleet from October 1910 through mid-1914, with few events of note for Hela during this period. Following the outbreak of World War I in July 1914, Hela was deployed to the patrol line guarding the German Bight. She was present at, but was not engaged in, the Battle of Helgoland Bight in August. The next month, while conducting training off Helgoland, she was torpedoed and sunk by the British submarine HMS E9. Despite the fact that Hela sank in less than half an hour, all of her crew, save two men, were rescued by a German U-boat and patrol boat.

General characteristics and machinery

Hela, named for the schooner Hela of 1852-vintage, was the culmination in the development of the aviso type in the German fleet. The avisos were developed from earlier torpedo boats and were intended for use in home waters with the fleet, both as flotilla leaders to direct groups of torpedo boats and as scouts for the fleet's capital ships. The first aviso, Zieten, was purchased from a British shipbuilder in 1875; seven more ships were built in German yards by the early 1890s. Of these, the last four vessels, comprising the Wacht and Meteor classes, had proved to be significant disappointments in service, owing to their poor seaworthiness and insufficient speed. In 1893, the naval construction staff prepared a design for a new vessel, provisionally designated "H", which remedied the problems of the earlier vessels, in part through a significant increase in size. This ship became Hela.[1][2]

The aviso type culminated in what would later be referred to as the light cruiser. German designers incorporated the best aspects of Hela's design—primarily a high top speed and an armor deck—with those of their contemporary unprotected cruisers of the Bussard class—namely, a heavy armament and long cruising radius. This combination resulted in the Gazelle-class cruisers, which were the first true light cruisers built in Germany.[3]

Hela early in her career

Hela was 104.6 meters (343 ft 2 in) long at the waterline and 105 m (344 ft 6 in) overall. She had a beam of 11 m (36 ft 1 in) and a draft of 4.46 m (14 ft 8 in) forward and 4.64 m (15 ft 3 in) aft. She was designed to displace 2,027 t (1,995 long tons), and at full load the displacement increased to 2,082 t (2,049 long tons). Her hull was constructed with transverse and longitudinal steel frames, which contained twenty-two watertight compartments above the armored deck and ten below. A double bottom ran for thirty-five percent of the length of the hull, which had a pronounced ram bow. The ship had a minimal superstructure, with a small conning tower. A raised forecastle deck extended from the stem to the funnel. She was fitted with a pair of light pole masts fitted with spotting tops.[4]

Hela's crew consisted of 7 officers and 171 enlisted men as completed and later increased to 8 officers and 187 enlisted men. She carried a number of small boats, including one barge, one yawl, and three dinghies. Later in her career, the barge was exchanged for a picket boat. Hela was very seaworthy, but she rolled badly (having a metacentric height of 0.775 m (2 ft 6.5 in)) and tended to ship a significant amount of water in a head sea because she was slightly bow-heavy. Steering was controlled by a single rudder; she had average maneuverability.[4]

The ship was powered by two 3-cylinder triple-expansion steam engines; each drove a screw propeller that was 3.25 m (10 ft 8 in) in diameter. Each engine had its own separate engine room. The engines were supplied with steam by six locomotive boilers split into two boiler rooms, which were ducted into a single funnel amidships. The engines were rated at 6,000 metric horsepower (5,900 ihp) and a top speed of 20 knots (37 km/h; 23 mph), though on trials they reached a half knot better. Coal storage amounted to 340 long tons (350 t); range figures for the ship in her original configuration have not survived. Hela was equipped with three electrical generators that produced 36 kilowatts at 67 volts.[4]

Armament and armor

Plan and profile drawing of Hela

Hela was armed with a main battery of four 8.8 cm (3.5 in) SK L/30[a] quick-firing guns in individual mountings. They were carried in MPL C/89 mounts with an elevation range of 10 to 20 degrees; at maximum elevation, the guns could reach targets at 7,300 m (24,000 ft). The guns fired 7 kg (15 lb) projectiles at a muzzle velocity of 590 m/s (1,900 ft/s). These guns were provided with a total of 800 rounds, for 200 per gun.[4][5] Rate of fire was theoretically fourteen shots per minute, but in practice it was limited to ten rounds per minute.[6]

She was also equipped with six 5 cm (2 in) SK L/40 quick-firing guns, each mounted in individual Torpedobootslafette (Torpedo Boat Mount) C/92. These guns fired 1.7 kg (3.8 lb) shells at a muzzle velocity of 2,152 ft/s (656 m/s). Maximum elevation for the guns was twenty degrees, which provided a range of 6,180 m (6,760 yd). Shell storage amounted to 1,500 rounds, or 300 per gun.[4][7] Her armament was completed with three 45 cm (17.7 in) torpedo tubes. Two were placed on the deck on the broadside and the third was submerged in the bow of the ship. These were supplied with a total of eight torpedoes,[4] which carried a 87.5 kg (193 lb) warhead. Their maximum range at 32 knots was 500 m (1,600 ft); when set to 26 kn (48 km/h; 30 mph), their range increased to 800 m (2,600 ft).[8]

Hela was lightly armored. She was protected by an armor deck that was 20 mm (0.79 in) thick and composed of steel. The deck sloped on the sides, and was slightly increased in thickness to 25 mm (0.98 in) to provide a measure of protection against direct fire. An armored coaming that was 40 mm (1.6 in) thick protected the uptakes from the boilers. Her conning tower was armored with 30 mm (1.2 in) thick steel on the sides. She was equipped with cork cofferdams to reduce the ingress of water in the event of hull damage.[4]

Modifications

Hela was modernized in 1903–1910 at the Kaiserliche Werft (Imperial Shipyard) in Danzig. The vessel's internal subdivision was improved with eight additional watertight compartments above the waterline and an extension of the double bottom to cover thirty-nine percent of the hull. As part of the modifications to her hull, both of the broadside torpedo tubes were moved to torpedo rooms below the waterline. She also received eight Marine-type water-tube boilers in place of her old models, and a second funnel was added. The new boilers produced 5,982 metric horsepower (5,900 ihp) on trials, propelling the ship to the same top speed. Coal storage was increased to 412 long tons (419 t), which permitted a cruising radius of 3,000 nautical miles (5,600 km; 3,500 mi) at a speed of 12 knots (22 km/h; 14 mph). Both of her stern 8.8 cm guns were removed and their ammunition allotment was reduced to 156 shells per gun. Her aft superstructure was enlarged to provide additional accommodation space. The ship also received a larger bridge.[4][9]

Service history

Notes

References

Related Articles

Wikiwand AI