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Onverschrokken
Class overview
Name	Onversaagd class
Builders	Astoria Marine Construction, Astoria, Oregon Boston Naval Shipyard, Boston, Massachusetts Peterson Builders, Sturgeon Bay, Wisconsin
Operators	Royal Netherlands Navy
Built	1952–1955
In commission	1954–1987
Planned	6
Completed	6
Scrapped	5
Preserved	1
General characteristics
Type	Minesweeper
Displacement	750 t (740 long tons)
Length	50.29 m (165 ft 0 in)
Beam	10.67 m (35 ft 0 in)
Draft	2.80 m (9 ft 2 in)
Propulsion	2 propellers 1,600 hp (1,200 kW) 2 x General Motors diesel engines
Speed	15.5 knots (28.7 km/h; 17.8 mph)
Crew	72
Armament	1 x 40 mm gun

The Onversaagd class was a ship class of six minesweepers that were built in the United States for the Royal Netherlands Navy (RNN). They were paid for by the United States under the Mutual Defense Assistance Program (MDAP). The minesweepers were based on the design of the Aggressive class and taken into service of the RNN between 1954 and 1955.

Design

To sweep naval mines the minesweepers of the Onversaagd class were equipped with the Wire Mk1, M Mk 6 A, A Mk 6B and the A Mk 4v. Furthermore, the ships had a single 40 mm gun. In addition, the minesweepers were equipped with a prototype of the UQS-1, but this mine avoidance sonar did not meet expectations.

While the Onversaagd-class minesweepers had a range of 2,200 nautical miles (4,100 km; 2,500 mi), it was deemed insufficient, as it meant that the ships could only stay at sea for a maximum of eight to nine days without having to replenish its oil.

Ships in class

• ¹ = later rebuild as hydrographic survey vessel
• ² = later rebuild as mine clearance support vessel
• ³ = later rebuild as Submarine support vessel

Citations

1. "Onversaagd klasse" (in Dutch). Onze Marine Vloot. Retrieved 7 December 2022.
2. ^ van Amstel (1991), p. 115.
3. "Amerikaanse mijnenveger in Nederland aangekomen". Trouw (in Dutch). 21 December 1954.
4. Schoonoord (2012), p. 57.
5. "Eerste mijnenveger uit V.S. aangekomen". Nijmeegsch Dagblad (in Dutch). 21 December 1954.
6. ^ Roetering (1997), p. 131.
7. Schoonoord (2012), p. 74.
8. van Amstel (1991), pp. 114-117.
9. Raven (1988), p. 184.
10. van Amstel (1991), p. 89.
11. "Hr.Ms. Onversaagd" (in Dutch). Onze Marine Vloot. Retrieved 7 December 2022.
12. "Hr.Ms. Onbevreesd" (in Dutch). Onze Marine Vloot. Retrieved 7 December 2022.
13. "Hr.Ms. Onverschrokken" (in Dutch). Onze Marine Vloot. Retrieved 7 December 2022.
14. "Hr.Ms. Onvermoeid" (in Dutch). Onze Marine Vloot. Retrieved 7 December 2022.
15. "Hr.Ms. Onvervaard" (in Dutch). Onze Marine Vloot. Retrieved 7 December 2022.
16. "Hr.Ms. Waalwijk" (in Dutch). Onze Marine Vloot. Retrieved 7 December 2022.

References

• Raven, G.J.A., ed. (1988). De kroon op het anker: 175 jaar Koninklijke Marine (in Dutch). Amsterdam: De Bataafsche Leeuw. ISBN 90-6707-200-1.
• Roetering, B., ed. (1997). Mijnendienst 1907-1997 90 jaar: feiten, verhalen en anekdotes uit het negentigjarig bestaan van de Mijnendienst van de Koninklijke Marine (in Dutch). ISBN 90-90-10528-X.
• Schoonoord, D.C.L. (2012). Pugno pro patria: de Koninklijke Marine tijdens de Koude Oorlog (in Dutch). Franeker: Van Wijnen. ISBN 978-90-5194-455-6.
• van Amstel, W.H.E. (1991). De schepen van de Koninklijke Marine vanaf 1945 (in Dutch). Alkmaar: De Alk. ISBN 90-6013-997-6.

• Onversaagd-class minesweepers
• Mine warfare vessel classes