:Panther-class cruiser

The Austro-Hungarian Marinekommandant (Navy Commander), Vizeadmiral (Vice Admiral) Maximilian Daublebsky von Sterneck, argued in a memorandum of 8 September 1884 addressed to Kaiser Franz Joseph I the fleet was too weak and must be expanded. The core of the fleet, ten ironclad warships were weak and out of date by international standards, the torpedo vessels were too few in number and too slow to be of use, and the wooden frigates and corvettes were useless as warships. He acknowledged that the government had failed to meet the fleet plan that had been outlined by VAdm Wilhelm von Tegetthoff in the early 1870s, owing to the chronically short naval budgets approved by the Imperial Council of Austria and the Diet of Hungary. Since new, more powerful, and thus more expensive ironclads could not be built, Sterneck made the argument that cheaper defensive weapons should be acquired; these included naval mines and more effective torpedo-armed ships. In the memorandum, he outlined requirements for a so-called "torpedo ram cruiser". Such a vessel should have a reinforced bow for ramming as well as torpedoes for attacks on larger warships. The cruisers would also be small and fast enough to undertake patrol and reconnaissance duties.{{sfn|Sieche|p=7}}{{sfn|Bilzer|p=32}}

File:SMS Leopard NH 87315.jpg

Sterneck suggested a ship of about {{convert|1500|MT|sp=us|lk=on}}, with a speed of {{convert|18|to|19|kn|lk=in}}; he also predicted that the type would lead to the development of larger vessels around {{convert|3500|MT|sp=us|abbr=on}}, armed with large-caliber guns and protected only with deck armor. These latter ships would be capable of engaging ironclads directly, and would be much cheaper than traditional ironclads. Sterneck called for three of the 1,500-ton cruisers to be built, along with several other recommendations to strengthen the fleet. On 18 September, Franz Joseph replied to Sterneck, authorizing him to proceed with his plans. Since the fleet had no vessels of the type, and thus no experience designing cruisers to fit his requirements, offers were extended to five British shipyards, with the only design requirements being a speed of at least {{convert|17|kn}}, an armament of {{convert|12|cm|abbr=on}} guns, on the smallest possible displacement. The Austro-Hungarian Navy established a commission to examine the designs submitted by the British firms; Armstrong received the contract in part because they could build the ships more cheaply. The commission requested the ventilation for the boilers be improved, and requested that the armament consist of four deck-mounted torpedo tubes, two 12 cm guns, and ten {{convert|47|mm|abbr=on}} Hotchkiss revolver cannon.{{sfn|Bilzer|pp=32–33}}

Naval architect Siegfried Popper was sent to Britain to supervise the construction of the ships. While the vessels were under construction, Popper discovered that the designers had made a serious error distributing the weight of the ships, such that the difference between the forward and aft draft was {{convert|1.5|m|abbr=on}}. To rectify the problem, Armstrong made a series of proposals, from simply adding {{convert|30|MT|abbr=on|sp=us}} of ballast to the bow, extending the forecastle deck, or replacing the 12 cm guns with heavier {{convert|15|cm|abbr=on}} guns. All of these were rejected. Instead, a series of smaller changes were made to correct the trim, which included adding {{convert|7|MT|abbr=on|sp=us}} of iron ballast, increasing coal storage, increasing the thickness of the conning tower walls, lengthening the forecastle slightly, and shifting the storage for the pinnace and cutter forward.{{sfn|Bilzer|pp=33–34}}

By acquiring foreign built ships, the Austro-Hungarian Navy would also gain experience building modern small cruisers. In fact, Panther and Leopard provided the basis for the follow-on design, {{SMS|Tiger|1887|6}}, which was a slightly enlarged version of the earlier ships.{{sfn|Sieche & Bilzer|pp=277–278}}{{sfn|Sondhaus|p=87}} They were originally classified as "torpedo ships" (Torpedoschiff), equivalent of a torpedo cruiser in other navies. In 1903 they were reclassified as 3rd class cruisers, then in 1909 as small cruisers (Kleine Kreuzer).{{sfn|Sieche|p=7}}

File:SMS Panther NH 88914.tiff

The Panther-class cruisers were {{convert|69|m|ftin|sp=us}} long between perpendiculars, {{convert|71.38|m|ftin|abbr=on}} long at the waterline, and {{convert|73.19|m|ftin|abbr=on}} long overall. They had a beam of {{convert|10.39|m|ftin|abbr=on}} and a draft of {{convert|4.28|m|ftin|abbr=on}} normally and {{convert|4.5|m|abbr=on}} when fully loaded. They displaced {{convert|1582|MT|sp=us|abbr=on}} normally and up to {{convert|1730|MT|sp=us|abbr=on}} at full load. The ships' superstructure was fairly minimal, consisting primarily of a small conning tower forward. They had an inverted bow and a forecastle deck that extended for the first third of the vessels. They were fitted with a pair of pole masts. Their crew numbered 13 officers and 165 men, though this later increased to 198.{{sfn|Sieche & Bilzer|p=277}}{{sfn|Greger|p=27}}{{sfn|Bilzer|p=38}}

The ships' propulsion system consisted of a pair of two-cylinder vertical compound steam engines. Steam was provided by six cylindrical fire-tube boilers that were trunked into two funnels. The engines were rated at {{convert|6000|ihp|lk=in}} for a top speed of {{convert|18|kn}}. On trials, Panther reached a speed of {{convert|18.4|kn}} from {{convert|5940|ihp|abbr=on}}, slightly slower than her sister ship {{SMS|Leopard|1885|2}}, which made {{convert|18.7|kn}} from {{convert|6380|ihp|abbr=on}}.{{sfn|Sieche & Bilzer|p=277}}{{sfn|Greger|p=27}} These speeds were achieved using forced draft; running the machinery normally resulted in a speed of {{convert|17.6|kn}}. During the speed trials, Armstrong experimented with using smaller screws with lower pitch in an attempt to exceed {{convert|19|kn}}, but the tests proved unsuccessful.{{sfn|Bilzer|p=34}} The ships had a cruising radius of {{convert|2800|nmi|lk=in}} at a more economical speed of {{convert|10|kn}}.{{sfn|Sieche & Bilzer|p=277}}{{sfn|Greger|p=27}} Unlike earlier cruising ships of the Austro-Hungarian Navy, Panther and Lussin did not carry a sailing rig to supplement their steam engines.{{sfn|Sondhaus|p=87}}

Panther and Leopard were armed with a main battery of two {{convert|12|cm|sp=us|adj=on}} 35-caliber (cal.) guns manufactured by Krupp in single mounts, which were sponsoned abreast of the funnels. These were supported by a secondary battery of four 47 mm quick-firing guns and six 47 mm Hotchkiss revolver cannon, which provided close-range defense against torpedo boats. They were also armed with four {{convert|14|in|mm|abbr=on|0}} torpedo tubes. The torpedo tubes were located singly, in the bow, stern, and at either beam. In June 1909, Panther was rearmed with four Škoda 7 cm guns 45-cal. guns and ten 47 mm QF guns, along with her original torpedo tubes. Leopard was similarly reequipped the following year. The Panther-class ships were protected with a thin {{convert|12|mm|abbr=on}} armored deck. The hatches above the engine room were {{convert|50|mm|abbr=on|0}} thick.{{sfn|Sieche & Bilzer|p=277}}{{sfn|Greger|p=27}}

File:SMS Leopard NH 87311.jpg

After their crews arrived to take them back to Austria-Hungary in early 1886, both vessels were taken into the navy's shipyard in Pola, where their armament was installed over the course of 1887, to include their torpedo tubes. Both ships took part in the Barcelona Universal Exposition, which saw a squadron of ironclads and cruisers sent to represent Austria-Hungary at the opening ceremonies. Coincidentally, both ships ran aground during training operations in late June 1888. The two cruisers spent much of the early 1890s laid up, with Panther being reactivated in 1896 for a major training cruise in the Pacific Ocean from May 1896 to February 1898, and Leopard returning to service in 1897 to participate in an international naval demonstration off the island of Crete during the Greco-Turkish War. Leopard went on a training cruise in the Pacific in 1900–1901 for naval cadets, while Panther spent those years in reserve. The latter went on a cruise to Morocco in 1902, and to eastern Africa in 1905 to arrange a trade treaty with Ethiopia before embarking on another cruise in the Pacific. In the meantime, Leopard served with the main Austro-Hungarian fleet in home waters in the mid-1900s.{{sfn|Bilzer|pp=35–39}}{{sfn|Sondhaus|pp=107, 185}}

Leopard went on another tour of the Pacific in 1907–1909, and she was relieved in East Asian waters by Panther in April 1909, the latter remaining there until November 1910. Leopard was laid up from 1910 to 1913, during which time Panther served as a station ship in Trieste.{{sfn|Bilzer|pp=35–39}} At the outbreak of World War I in July 1914, both ships were assigned to the Coastal Defense Special Group. Panther shelled Montenegrin forces on Mount Lovcen overlooking the naval base in Cattaro Bay in January 1916, supporting an offensive by the Austro-Hungarian army to take the heights; the action ultimately forced Montenegro out of the war. Leopard was stationed in Pola for the duration of the war.{{sfn|Greger|p=12}}{{sfn|Sondhaus|p=257}}{{sfn|Halpern|pp=8–9}} After Austria-Hungary's defeat in November 1918, both ships were ceded as war prizes to the victorious Allies, and Britain received both vessels under the terms of the Treaty of Saint-Germain-en-Laye. Both were sold to Italian ship breakers in 1920.{{sfn|Bilzer|pp=35–39}}

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{{Panther class cruisers}}

{{Austro-Hungarian Navy classes}}