SMS Kronprinz (1867)

Kronprinz was 88.20 meters (289 ft 4 in) long at the waterline and 89.44 m (293 ft 5 in) long overall. She had a beam of 15.20 m (49 ft 10 in) and a draft of 7.85 m (25 ft 9 in) forward and 7.45 m (24 ft 5 in) aft. The ship was designed to displace 5,767 metric tons (5,676 long tons) at a normal loading, and up to 6,760 t (6,650 long tons) at full load. The ship's hull was constructed with transverse and longitudinal iron frames. It contained nine watertight compartments and a double bottom that ran for 43 percent of the length of the vessel. The ship was an excellent sea boat; the ship was responsive to commands from the helm but had a large turning radius. Steering was controlled with a single rudder. The ship's crew numbered 33 officers and 508 enlisted men. Kronprinz carried a number of smaller boats, including a large tender, two launches, a pinnace, two cutters, two yawls, and one dinghy.[3]

The ship's propulsion system was built by John Penn and Sons of Greenwich, England. A horizontal, two-cylinder single-expansion steam engine powered the ship. It drove a two-bladed screw 6.5 m (21 ft 4 in) in diameter. Eight trunk boilers, with four fireboxes in each, were divided into two boiler rooms. Each room was vented into its own funnel. The boilers supplied steam to the engine at 2 standard atmospheres (200 kPa). The propulsion system was rated at 4,500 metric horsepower (4,400 ihp) and a top speed of 13.5 knots (25.0 km/h; 15.5 mph), though on trials Kronprinz managed to make 4,870 PS (4,800 ihp) and 14.7 knots (27.2 km/h; 16.9 mph). The ship carried up to 646 t (636 long tons) of coal, which enabled a maximum range of 3,200 nautical miles (5,900 km; 3,700 mi) at a cruising speed of 10 knots (19 km/h; 12 mph) and a range of 1,730 nmi (3,200 km; 1,990 mi) at 14 knots. A barque rig with a surface area of 1,980 square meters supplemented the steam engine.[3]

As built, Kronprinz was equipped with a main battery of thirty-two rifled 72-pounder cannon. After her delivery to Germany, these guns were replaced with a pair of 21-centimeter (8.3 in) L/22 guns and fourteen 21 cm L/19 guns. The L/22 gun could depress to −5 degrees and elevate to 13 degrees, which provided a range of 5,900 m (6,500 yd). The shorter barreled L/19 guns had a wider range of elevation, from −8 to 14.5 degrees, but the shorter barrel imposed a lower muzzle velocity, which correspondingly reduced the range of the gun to 5,200 m (5,700 yd). The two types of gun fired the same shell, of which the total supply numbered 1,656 rounds of ammunition. The fourteen L/19 guns were placed in a central battery amidships, seven on either broadside. The L/22 weapons were placed on either end of the ship as chase guns.[3]

Later in her career, six 3.7 cm (1.5 in) Hotchkiss revolver cannon in individual mounts were installed, along with five 35 cm (13.8 in) torpedo tubes.[4] Two of the tubes were placed in the bow, one on each broadside, and one in the stern on the port side. All were placed above water, and were supplied with a total of 12 torpedoes.[3]

Kronprinz's armor consisted of wrought iron backed with heavy teak planking. The iron component of the waterline armored belt ranged in thickness from 76 mm (3 in) in the stern to 124 mm (4.9 in) amidships and 114 mm (4.5 in) toward the bow. The entire belt was backed with 254 mm (10 in) of teak. Above the belt was a strake of iron plate that ranged in thickness from 114 to 121 mm (4.5 to 4.8 in) on 254 mm of timber, which protected the broadside battery. The battery's roof was protected by 9-millimeter-thick (0.35 in) iron plating, intended to deflect shots that passed over the side of the ship or fragments from explosions.[3]

Kronprinz joined Friedrich Carl and the new armored frigate König Wilhelm, the latter serving as the fleet flagship, for training exercises in August and September. In May 1870, the three ships were joined by Prinz Adalbert for a visit to Britain, though Friedrich Carl was damaged after running aground in the Great Belt. Kronprinz, König Wilhelm, and Prinz Adalbert continued on to Plymouth while Friedrich Carl returned to Kiel for repairs. The latter vessel quickly rejoined the ships there and on 1 July they departed for a training cruise to Fayal in the Azores, Portugal. But as tensions with France over the Hohenzollern candidacy for the vacant Spanish throne. While they cruised east through the English Channel, they learned of the increasing likelihood of war, and the Prussians detached Prinz Adalbert to Dartmouth to be kept informed of events. The rest of the squadron joined her there on 13 July, and as war seemed to be imminent, the Prussians ended the cruise and returned to home. Kronprinz had to take Prinz Adalbert under tow for the voyage due to the latter's slow speed.[7][8]

Kronprinz on maneuvers with Friedrich Carl and Ariadne

The ships arrived back in Wilhelmshaven on 16 July, three days before France declared war on Prussia over the Ems Dispatch, initiating the Franco-Prussian War. The greatly numerically inferior Prussian Navy assumed a defensive posture against a naval blockade imposed by the French Navy. Kronprinz, Friedrich Carl, and König Wilhelm were concentrated in the North Sea at the port of Wilhelmshaven, with a view toward breaking the French blockade of the port.[8][9] They were subsequently joined there by the turret ship Arminius, which had been stationed in Kiel.[10] For the duration of the conflict, Kronprinz was commanded by Captain Reinhold von Werner.[11] Despite the great French naval superiority, the French had conducted insufficient pre-war planning for an assault on the Prussian naval installations, and concluded that it would only be possible with Danish assistance, which was not forthcoming.[9]

The four ships, under the command of Vizeadmiral (Vice Admiral) Eduard von Jachmann, made an offensive sortie in early August 1870 out to the Dogger Bank, though they encountered no French warships. Kronprinz and the other two broadside ironclads thereafter suffered from chronic engine trouble, which left Arminius alone to conduct operations.[12] Kronprinz, Friedrich Carl, and König Wilhelm stood off the island of Wangerooge for the majority of the conflict, while Arminius was stationed in the mouth of the Elbe river.[13] On 11 September, the three broadside ironclads were again ready for action; they joined Arminius for another major operation into the North Sea. It too did not encounter French opposition, as the French Navy had by this time returned to France.[12] The Prussians planned to send Kronprinz, which had been overhauled over the winter of 1870–1871, on a raid of the port of Cherbourg in February, but the French signed the armistice that ended the war on 28 January.[14]

Kronprinz in Kiel in 1892

Through the 1870s, the German armored fleet typically saw active service during the summer months. Over the winter, most of the vessels were placed in reserve with one or two kept in a state of reduced commission as guard ships. Kronprinz towed a floating dry dock from Swinemünde to Kiel in June 1871, with assistance from the gunboat Cyclop and the paddle steamer Preussischer Adler. At the same time, the screw corvette Nymphe was in Brazil while on an overseas cruise; some of her crew had been arrested following a fistfight in the country. The Germans threatened to deploy Kronprinz, Friedrich Carl, three more corvettes, and two gunboats, which convinced the Brazilian government to release the crewmen. For 1875's summer training cruise, Kronprinz and König Wilhelm were joined by the recently built ironclads Kaiser and Hansa, though the ships remained in German waters. The next year, the ironclad squadron—Kronprinz, Friedrich Carl, Kaiser, and the new Deutschland—were sent to the Mediterranean Sea in response to the murder of the German consul in Salonika in the Ottoman Empire. The German ships were joined by French, Russian, Italian, and Austro-Hungarian warships in an international demonstration condemning the murder. The Germans returned home in August and, after arriving in September, were laid up for the winter.[15]

Kronprinz remained laid up for the 1878 training cruise that saw the loss of the brand-new ironclad Grosser Kurfürst in an accidental collision with Kaiser. She returned to service the following year when the squadron was reactivated in May; Friedrich Carl served as the flagship and the squadron also included the ironclads Preussen and Friedrich der Grosse. The ships visited Norway on the cruise. Kronprinz was again left in reserve for 1880, but she was recommissioned in 1881 to replace the new armored corvette Sachsen, which was suffering from unreliable engines. Once again, the ships remained in German waters. The next two years followed the same pattern. Engine problems plagued the ship throughout her career; Kronprinz's engines broke down during the fleet maneuvers in May 1883. Two of the three other armored frigates also broke down, which forced the cancellation of the maneuvers. Later that year, the training cycle concluded with a large-scale simulated attack on Kiel, with Kronprinz and the other ironclads acting as an "eastern" opponent. The defenders, led by the corvettes Luise and Blücher, were judged to have been victorious. The armored fleet operated entirely under steam power that year, the first time it did so.[16][17]

Kronprinz was docked for modernization in late 1883; she received new boilers and the six Hotchkiss revolver cannon and six torpedo tubes were installed. By 1884, the four Sachsen-class ironclads had entered service, and they formed the training squadron that year.[18] Kronprinz had anti-torpedo nets installed in 1885; these were later removed in 1897.[3] In 1887, she was present for the ceremonies marking the beginning of construction of the Kaiser Wilhelm Canal, which was to link the Kiel with the North Sea.[19] The ship served on active duty with the fleet until 22 August 1901, when she was stricken from the naval register. She was reconstructed at the Imperial Dockyard in Kiel that year. The propulsion system was overhauled and the eight J Penn & Sons boilers were removed. Two Dürr and two Thornycroft boilers were installed in their place. Her barque rig was cut down to 1,409 square meters (15,170 sq ft).[3] After emerging from the reconstruction, Kronprinz served as a training ship for engine-room personnel, based in Kiel.[4] The ship was ultimately sold to Bonn, a German ship-breaking firm, on 3 October 1921 for 5,000,000 marks. Kronprinz was broken up for scrap in Rendsburg-Audorf later that year.[3]