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A 1902 lithograph of Iltis
Class overview
Preceded by	SMS Loreley
Succeeded by	SMS Meteor
Built	1897–1903
In commission	1898–1917
Completed	6
Lost	5
Scrapped	1
General characteristics
Type	Gunboat
Displacement	Designed: 894 t (880 long tons) Full load: 1,048 t (1,031 long tons)
Length	65.2 m (213 ft 11 in) o/a
Beam	9.1 m (29 ft 10 in)
Draft	3.59 m (11 ft 9 in)
Installed power	4 × Thornycroft boilers 1,300 PS (1,300 ihp)
Propulsion	2 × triple-expansion steam engines 2 × screw propellers
Speed	13.5 knots (25.0 km/h; 15.5 mph)
Range	3,080 nautical miles (5,700 km; 3,540 mi) at 9 knots (17 km/h; 10 mph)
Complement	9 officers 121 enlisted men
Armament	4 × 8.8 cm (3.5 in) SK L/30 guns 6 × 37 mm (1.5 in) Maxim guns
Armor	Conning tower: 8 mm (0.31 in)
Notes

The Iltis class was a group of six gunboats built for the German Kaiserliche Marine (Imperial Navy) in the late 1890s and early 1900s. The class comprised Iltis, the lead ship, Jaguar, Tiger, Luchs, Panther, and Eber.

Design

General characteristics

The ships of the Iltis class varied slightly in dimensions. The first four ships were 65.2 meters (213 ft 11 in) long overall and had a beam of 9.1 m (29 ft 10 in), while Panther and Eber were 66.9 m (219 ft 6 in) long overall; their beam increased slightly to 9.7 m (31 ft 10 in). The ships had a draft of 3.54 to 3.59 m (11 ft 7 in to 11 ft 9 in) forward. Iltis and Jaguar displaced 894 metric tons (880 long tons) as designed and 1,048 t (1,031 long tons) at full load. Tiger and Luchs had the same design displacement, but full load increased to 1,108 t (1,091 long tons). The final pair of ships, Panther and Eber, increased design displacement to 977 t (962 long tons) and full load to 1,193 t (1,174 long tons).

Their hull consisted of transverse steel frames, over which the composite steel and timber hull planking was laid. They were sheathed in Muntz metal to protect them from marine biofouling on extended voyages abroad. Iltis's hull was divided into eleven watertight comparments, while the rest of the class only had ten. They all had a double bottom under the propulsion machinery spaces. The first two ships had a raised forecastle deck and a pronounced ram bow, while the latter four exchanged the ram for a straight stem. Their superstructure consisted primarily of a conning tower with an open bridge atop it. The only armor protection carried by the ships was 8 mm (0.31 in) of steel plate on the conning tower.

Steering was controlled via a single rudder, and they maneuvered well under most conditions, apart from shallow waters or at high speed. The ships handled generally well, and were considered good sea boats, but they rolled badly in a beam sea. They also suffered from significant yaw and heel in a quartering sea. For Panther and Eber, their deadwood was extended to correct the tendency to lose way.

They had a crew of 9 officers and 121 enlisted men. Each vessel carried a number of smaller boats, including one barge, one launch, one cutter, one yawl, and one dinghy. In addition, Panther and Eber each carried a second cutter, and while the Iltis-class ships operated in Chinese waters, they carried a pair of sampans as well.

Machinery

Iltis's propulsion system consisted of a pair of horizontal triple-expansion steam engines, each driving a single three-bladed screw propeller; the rest of the class received vertical triple-expansion engines. The engines were placed in a single engine room. Steam for the engines was supplied by four coal-fired Thornycroft boilers, with the exception of Eber, which received four navy-type boilers. All ships had their boilers installed in a single boiler room. Exhaust was vented through two funnels located amidships.

The ships was rated to steam at a top speed of 13.5 knots (25.0 km/h; 15.5 mph) at 1,300 metric horsepower (1,300 ihp), though all members of the class exceeded these figures in service. The ships' engines varied in efficiency. Iltis and Jaguar had a cruising radius of about 3,080 nautical miles (5,700 km; 3,540 mi) at a speed of 9 knots (17 km/h; 10 mph), but at the same speed, Tiger and Luchs were capable of only 2,580 nautical miles (4,780 km; 2,970 mi). Panther and Eber, meanwhile, could sail for 3,400 nautical miles (6,300 km; 3,900 mi) at that speed.

Armament

Iltis and Jaguar were armed with a main battery of four 8.8 cm (3.5 in) SK L/30 guns, with 1,124 rounds of ammunition. Two guns were placed side-by-side on the forecastle and the other pair side-by-side near the stern. The rest of the class exchanged these guns for a pair of 10.5 cm (4.1 in) SK L/40 guns, which had become available during the design process for the third member of the class. These guns were supplied with 482 rounds of ammunition. These were also carried at the bow and stern, but singly. All six ships also carried six 37 mm (1.5 in) Maxim guns.

Ships

Service history

Notes

Footnotes

1. Figures are for Iltis; other members of the class varied in some details

Citations

1. ^ Gröner, pp. 142–143.
2. Lyon, p. 260.
3. ^ Gröner, p. 143.
4. Nottelmann, p. 77.
5. ^ Gröner, p. 142.
6. Nottelmann, pp. 74, 76.

References

• Gröner, Erich (1990). German Warships: 1815–1945. Vol. I: Major Surface Vessels. Annapolis: Naval Institute Press. ISBN 978-0-87021-790-6.
• Hildebrand, Hans H.; Röhr, Albert & Steinmetz, Hans-Otto (1993). Die Deutschen Kriegsschiffe: Biographien: ein Spiegel der Marinegeschichte von 1815 bis zur Gegenwart [The German Warships: Biographies: A Reflection of Naval History from 1815 to the Present] (in German). Vol. 2. Ratingen: Mundus Verlag. ISBN 978-3-8364-9743-5.
• Hildebrand, Hans H.; Röhr, Albert & Steinmetz, Hans-Otto (1993). Die Deutschen Kriegsschiffe: Biographien – ein Spiegel der Marinegeschichte von 1815 bis zur Gegenwart [The German Warships: Biographies − A Reflection of Naval History from 1815 to the Present] (in German). Vol. 4. Ratingen: Mundus Verlag. ISBN 978-3-7822-0382-1.
• Hildebrand, Hans H.; Röhr, Albert & Steinmetz, Hans-Otto (1993). Die Deutschen Kriegsschiffe: Biographien: ein Spiegel der Marinegeschichte von 1815 bis zur Gegenwart (Band 5) [The German Warships: Biographies: A Reflection of Naval History from 1815 to the Present (Vol. 5)] (in German). Ratingen: Mundus Verlag. ISBN 978-3-7822-0456-9.
• Hildebrand, Hans H.; Röhr, Albert & Steinmetz, Hans-Otto (1993). Die Deutschen Kriegsschiffe: Biographien: ein Spiegel der Marinegeschichte von 1815 bis zur Gegenwart (Band 7) [The German Warships: Biographies: A Reflection of Naval History from 1815 to the Present (Vol. 7)] (in German). Ratingen: Mundus Verlag. ISBN 9783782202671.
• Hildebrand, Hans H.; Röhr, Albert & Steinmetz, Hans-Otto (1993). Die Deutschen Kriegsschiffe: Biographien – ein Spiegel der Marinegeschichte von 1815 bis zur Gegenwart [The German Warships: Biographies − A Reflection of Naval History from 1815 to the Present] (in German). Vol. 8. Ratingen: Mundus Verlag.
• Lyon, Hugh (1979). "Germany". In Gardiner, Robert; Chesneau, Roger; Kolesnik, Eugene M. (eds.). Conway's All the World's Fighting Ships 1860–1905. Greenwich: Conway Maritime Press. ISBN 978-0-85177-133-5.
• Nottelmann, Dirk (2022). "The Development of the Small Cruiser in the Imperial German Navy Part III: The Gunboats". In Jordan, John (ed.). Warship 2022. Oxford: Osprey Publishing. pp. 63–79. ISBN 978-1-4728-4781-2.

• Iltis-class gunboats