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 minesweeper 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 2200 nmi, 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