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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).^[3]^[4] They were paid for by the United States under the Mutual Defense Assistance Program (MDAP).^[5] The minesweepers were based on the design of the Aggressive class and taken into service of the RNN between 1954 and 1955.^[6]

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.^[6] Furthermore, the ships had a single 40 mm gun.^[2] In addition, the minesweepers were equipped with a prototype of the UQS-1, but this mine avoidance sonar did not meet expectations.^[6]

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.^[7]

Ships in class

*Onversaagd*-class construction data^[8]^[9]^[10]
Hull number	Name	Builder	Laid down	Launched	Commissioned	Decommissioned	Fate	Notes
M884 / A854	Onversaagd ¹	Astoria Marine Construction	24 September 1952	4 November 1953	27 May 1954	23 July 1976	Sold for scrap to Liguria Maritime Ltd. in 1979	^[11]
M885 / A855	Onbevreesd ²	Astoria Marine Construction	8 December 1952	7 November 1953	21 September 1954	28 May 1982		^[12]
M886 / A856	Onverschrokken ³	Peterson Builders	19 February 1952	17 January 1953	22 Juli 1954	12 February 1987	Museum ship in Vlissingen	^[13]
M887 / A857	Onvermoeid ²	Boston Naval Shipyard	27 February 1953	2 May 1953	23 September 1954	1 October 1971	Sold for scrap to Ross & Sons in 1975	^[14]
M888 / A858	Onvervaard ²	Astoria Marine Construction	11 April 1952	6 March 1954	31 January 1955	26 April 1968	Sold for scrap to Deans Marine Ltd. in 1983	^[15]
M889 / A859	Onverdroten ²	Peterson Builders	17 February 1952	22 August 1953	22 November 1954	26 February 1965	Sold for scrap to the firm Mantel in 1984	^[16]

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

Citations

^ "Onversaagd klasse" (in Dutch). Onze Marine Vloot. Retrieved 7 December 2022.
^ ^a ^b van Amstel (1991), p. 115.
^ "Amerikaanse mijnenveger in Nederland aangekomen". Trouw (in Dutch). 21 December 1954.
^ Schoonoord (2012), p. 57.
^ "Eerste mijnenveger uit V.S. aangekomen". Nijmeegsch Dagblad (in Dutch). 21 December 1954.
^ ^a ^b ^c Roetering (1997), p. 131.
^ Schoonoord (2012), p. 74.
^ van Amstel (1991), pp. 114-117.
^ Raven (1988), p. 184.
^ van Amstel (1991), p. 89.
^ "Hr.Ms. Onversaagd" (in Dutch). Onze Marine Vloot. Retrieved 7 December 2022.
^ "Hr.Ms. Onbevreesd" (in Dutch). Onze Marine Vloot. Retrieved 7 December 2022.
^ "Hr.Ms. Onverschrokken" (in Dutch). Onze Marine Vloot. Retrieved 7 December 2022.
^ "Hr.Ms. Onvermoeid" (in Dutch). Onze Marine Vloot. Retrieved 7 December 2022.
^ "Hr.Ms. Onvervaard" (in Dutch). Onze Marine Vloot. Retrieved 7 December 2022.
^ "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.