As substitution for the former German boats 10 S-boats of type "Elco-80“ were bought from the US Navy in the same year, boats with gasoline-motorsk. The boats were bought with financial support of USA (Military Defence Assistance and Advisory Program = MDAP) and ot the indication "Hai"-class. Six boats were decommissioned in the years 1960 to 1964. The other boats followed in 1966.

Elco 80'-Boat, here "PT 109" in the Pacific - Picture from Rottman: US Patrol Torpedo Boats

A private undertaker, Westermoen-Båtverft i Mandal, offered Sjøforsvaret 1952 a boat built on own cost for test-voyages. After thorough testing of the boat which had been called "Rapp" the Royal Norwegian Navy ordered five more boats which were commissioned in the years 1955/56.

KNM "Kjapp" - P 354 - Picture: Archives Lars H. Herbst

1958 offered the boat-yard at Mandal Søforsvaret again a boat built on own cost. Sjøforsvaret accepted the boat called "Nasty" which was propelled by diesel-motors as the essential novelty for testing. After detailed testing and some improvements as results from the testing Sjøforsvaret ordered 20 further boats of type "Tjeld" in two parts of 10 boats each were ordered. Two boats were ordered for Germany for comparing-tests ("Hugin" og "Munin"), six other boats were built for Greece and 14 for USA.

The 22. TKB in Northern Norway - in front "Tjeld"-class-boat P 348 "Hval" - Picture: Kalle Scheuch

In the early 1960s "Storm"-class was planned as supplement for the 20 motortorpedoboats of "Tjeld"-class as motorgunboats. The boats of "Tjeld"-class and the 24 boats of "Storm"-class were to form little combat-groups whereby wire-guided torpedoes were the main weapon of "Tjeld"-class-boats while "Storm"-class-boats were to receive a relatively strong artillery-arming.

The type-ship, KNM "Storm", was launched on 8. February 1962 and on 31. May 1963 the boat was finished. Then thorough testing commenced. 1965 the first series-boats with small changed were delivered. For cost-reasons only 20 of the  24 planned units were acquired which were commissioned uintil the end of 19567. As one of the last units followed P 960, KNM "Storm", since the trials-boat with this name was broken up because of the heavy wear and tear and had to be substituted by a new boat.

With six "Rapp"-, 20 "Tjeld"-, and 20 "Storm"-class-boats was Sjøforsvaret in numbers the strongest S-boat-force of NATO.

"Storm"-Class-Boat with Penguin-Launchers on the Quarterdeck in Northern Norway - Picture: Sjøforsvaret

In the early 1970s all boats were modernized. They were retrofitted with anti-ship-missiles »Penguin«, six of them could be taken on board. With that the Norwegian S-boat-Flotilla was also in terms of weapon-technics at the top of the Western Navies.

The boats of the three classes were grouped together in mixed units which got the indicators TKB-Skvadroner (Torpedo- og Gunboat Squadrons), Commander of such group was the Commanding Officer of a "Storm"-class-boat.

A mixed armament with missile- and torpedo-weapon on a S-Boat was for lthe first time introduced with "Snøgg"-class which was built in 1970/71 to release the in respect to weapon-technics old boats of "Rapp"-class. "Snøgg"-boats also got their names. Hull and propulsion were identical with the "Storm"-boats. The higher superstructure and the missing radome and the 76mm-gun were from the outside  the most noticeable destinguishing features. The boats had a command-and-cotrol-system inclusive Link 11 and were employed as guides of mixed S-boat-groups.

P 981 "Rapp" of Snøgg-Class - Picture from Fock: Schnellboote Bd. 3

The boats of  "Tjeld"-class which had gotten on in years were substituted by 14 new buildt units of "Hauk"-class in 1978 to 1980. The names of the "Tjeld"-class boats were taken over. 

Boat of "Hauk"-Class - Picture: Sjøforsvaret

The boats of "Hauk"-class were objects of some modernisations in the early 21. century what also made them fit for participation in the NATO-Operations Active Endeavor in the Straits of Gibraltar with four boats of the 21. MTB-Skvadron in 2003. 2006 until 2007 four boats of the 22. MTB-Skvadron were part of UNIFIL off the coast of Lebanon. 2004 th eboats were equipped with anti-air-missiles type Mistral and three heavy machineguns, The Penguin-missiles were upgraded and the command-and-control-system SENIT 2000 was improved. In spite of that six boats were decommissioned already in 2006 and four boats one year later. The last five boats served in the fleet until 2008. 

The type-boat of the last S-boat-class of the Royal Norwegian Navy, "Skjold"-class, was completed already in 1999 and was under thorough testing in Norway and USA. The boats were designed for high speed and restricted detectability. They belong to the fastest warships in teh world. They also show high seaworthiness and good manoeuvrability.

Boat of "Skjold"-Class - Picture: Sjøforsvaret

The Surface Effect Ship (SES) is built of fiberglas. Between the two hulls an air-cushion is built up by rubber-skirts which reduces the 270 t displacement by 50 to 80 %. The draught goes down from 2,3 to 0,9 m. The air-cushion is produced by two diesel-motors. The propulsion of the stealth-vehicle is by water-jet driven by a GOGAG-machinery with two gasturbines for smaller speeds and two further gasturbines for higher speeds and two diesel-motors for manoeuvring. Maximum speed is 60 knots.

The boats have a command-and-control-system SENIT 2000 including Link 11.

2010 untill 2013 five more boats were commissioned and teh boats were reclassified to  "Kystkorvetter" (coastal corvettes). 

After decommissioning of the last "Hauk"-class-boats the Royal Norwegian Navy (Sjøforsvaret) no longer has S-boats at its disposal.