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

Context 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.

Armament 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.

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

Ships ShipBuilderCampbell, p. 373Laid downLaunchedCompletedRijkswerf, Amsterdam25 Nov. 186919 Oct. 1870Rijkswerf, Amsterdam25 Nov. 186922 Dec. 1870Fijenoord, RotterdamMay 187020 May 1871Rijkswerf, Amsterdam 28 Sep. 1871Rijkswerf, Amsterdam28 December 1871Fijenoord, Rotterdam14 September 187514 September 1876Sold, 6 June 1907

See also List of ironclads

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