The boats were slightly larger than the Elco class.

All six boats were built by Westermoen Båtbyggeri og Mek Verksted, Mandal, with the first, Rapp launched on 7 May 1952 and completed on 18 November 1952.

[2] The class was designed, constructed and scale tested by Harald Henriksen in 1946.

The same design was used for 16 patrol boats delivered to the Swedish navy.

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