# Onversaagd-class minesweeper

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

Onversaagd-class construction data :
| Hull number | Name | Builder | Laid down | Launched | Commissioned | Decommissioned | Fate |
| 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 |
| M885 / A855 | Onbevreesd ² | Astoria Marine Construction | 8 December 1952 | 7 November 1953 | 21 September 1954 | 28 May 1982 | |
| M886 / A856 | Onverschrokken ³ | Peterson Builders | 19 February 1952 | 17 January 1953 | 22 Juli 1954 | 12 February 1987 | Museum ship in Vlissingen |
| 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 |
| 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 |
| 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 |
* 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.
* 1 2 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.
* 1 2 3 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.