The
Flyvefisken ships were constructed using an innovative modular design known as
StanFlex: they have a standard hull in which containerised weapons or systems can be placed. This allows them to rapidly change roles, typically in 48 hours. The containers measure . One container is situated on the foredeck; the other three go on the quarterdeck behind the superstructure and funnel. Possible configurations include: • Surveillance: Two storage modules, one of which with a
RHIB above deck, one crane module for deploying the RHIB, one module with a 76mm gun • Combat: One module with a 76mm gun, one module with
RIM-7 Sea Sparrow anti-air missiles, one module with
Boeing RGM-84 Harpoon missiles, one module with
MU90 Impact torpedoes • Minelayer: One module with a 76mm gun, one module with
RIM-7 Sea Sparrow anti-air missiles, one storage module with a
RHIB above deck, one crane module for deploying the RHIB or mines, 60 mines on deck-mounted rails • Pollution control: Two storage modules, one of which with a
RHIB above deck, one crane module for deploying the RHIB or specialized equipment, one module with a multipurpose winch • Antisubmarine warfare: One module with a 76mm gun, one storage module with a
RHIB above deck, one crane module for deploying the RHIB, one module with a TSM 2640 Salmon variable-depth active/passive sonar • Mine countermeasures/minehunter (MCM): One module with a 76mm gun, one module with
RIM-7 Sea Sparrow anti-air missiles, one module for control of MSF and MRD class drone minehunters, one crane module for deploying deck-carried ROVs The structure of the ships is built using a sandwich material, consisting of a layer of
fiberglass either side of a core of
PVC cell foam. This building method helps reduce maintenance costs, and is used to this day on the new
Diana and
-Holm class ships. == Comparison with replaced vessels ==