Adder-class monitor

Class overview
Name	Adder class
Operators	Royal Netherlands Navy
Preceded by	Heiligerlee class
Succeeded by	Draak
Completed	6
Lost	1
Scrapped	5
General characteristics (as completed)
Class and type	Adder-class monitor
Displacement	1,555–1,585 long tons (1,580–1,610 t)
Length	192.25–195.4 ft (58.6–59.6 m) (o/a)
Beam	44 ft (13.4 m)
Draft	9 ft 9 in (3.0 m)
Installed power	560–740 ihp (420–550 kW)
Speed	7–8 knots (13–15 km/h; 8.1–9.2 mph)
Complement	117
Armament	1 × twin 23 cm Armstrong RML or 1 × 28 cm A No. 1 (initially Luipaard only)
Armor	Belt: 5.5 in (140 mm) Gun turrets: 8–11 in (203–279 mm)

The Adder-class monitors were a group of six ironclad monitors built for the Royal Netherlands Navy in the 1870s.

The Adder class monitors very much resembled the preceding Heiligerlee class. There were some small differences, but the main difference was that the Adder class got a ram, which was very popular after the Battle of Lissa.

Haai would become the first monitor to be built by a private Dutch shipyard.

Just like the preceding Heiligerlee class, the Adders were armed with two 23 cm Armstrong rifled muzzle loaders. Luipaard differed by having only a single Krupp 28 cm breechloader, known as 28 cm A No. 1.^[1]

Later all ships of the class were re-armed with the 28 cm A No. 1, except Adder, which sank beforehand.

• List of ironclads

• Campbell, N. J. M. (1979). "The Netherlands". In Gardiner, Robert (ed.). Conway's All the World's Fighting Ships 1860–1905. Greenwich: Conway Maritime Press. pp. 371–377. ISBN 978-0-8317-0302-8.
• Tideman, B.J. (1880), Memoriaal van de Marine, Van Heteren Amsterdam