Yaeyama-class minesweeper

The Yaeyama class is the largest class of Japan Maritime Self-Defense Force minesweepers, designed for open-sea mine clearance operations. Three ships were built in the class, a further three ships were planned but were cancelled. The ships use wooden hulls to reduce their magnetic signature. Yaeyama class is one of the largest-sized wooden hull ships designed today (except old and replica ships).

JDS Yaeyama (MSO-301)
Class overview
Operators:  Japan Maritime Self-Defense Force
Succeeded by: Awaji-class minesweeper
Planned: 6
Completed: 3
Cancelled: 3
Retired: 3
General characteristics
Displacement:
  • 1,000 tons standard (Official)
  • 1,250 tons full load (estimated)
Length: 67 m (220 ft)
Beam: 11.8 m (38.7 ft)
Draft:   3.1 m (10.2 ft)
Depth:   5.2 m (17 ft)
Propulsion:
  • Diesel, two Mitsubishi 6NMU-TA1 diesels 2,400 hp (1.76 MW), two shafts
  • one 350 hp (257 kW) hydrojet bow thruster
Speed: 14 knots (26 km/h)
Complement: 60
Armament:

Jane's Fighting Ships notes their similarity to the U.S. Avenger-class minesweepers.

Design

The forecastle was stretched to more than 3/4 of the total length to suppress the increase of retention and member dimensions of the longitudinal strength.[1]

In order to cope with an increase in shear stress accompanying the enlargement of the ship and thickness increase, the outer plate structure has a three layer double arrow blade structure in which the inner layer plates are inclined at right angles to each other and a vertical laminate of the outer layer is stretched to this It is said. In the case of adopting the same double arrow blade structure as the conventional minesweeping boat, it was thought that the inner layer board thickness became 47 mm, but it is suppressed to 20 mm by this.

The use of various tree species, seen in the list below, is the same as the Uwajima-class minesweepers.

  • Douglas fir - keel skeg, bottom stringer, chine material, frame, the outer plate-deck
  • Keyaki - Kiel friction material
  • Oleaceae - plywood

The main engine is equipped with Mitsubishi Heavy Industries 4-cycle non-magnetic diesel engines of the same design as in the Uwajimas but with a larger output (1,200 hp / 1,000 Rpm) mounted via a double anti-vibration device. It is the first minesweeper in the Japanese navy to feature a bow thruster, GPS equipped with a precision navigation equipment and automatic Sokan apparatus in order to improve the ship's ability to hold position.

Ships in the class
Pennant no.NameLaid downLaunchedShipyardCommissionedDecommissionedHome portUnit
MSO-301Yaeyama30 August 199029 August 1991Hitachi, Kanagawa16 March 199328 June 2016　YokosukaMinesweeper Division 51
MSO-302Tsushima20 July 199020 September 1991Nikko, Tsurumi23 March 19931 July 2016YokosukaMinesweeper Division 51
MSO-303Hachijō17 May 199115 December 1992Nikko, Tsurumi24 March 19946 June 2017YokosukaMinesweeper Division 51

Comparable ships
  • Avenger class minesweepers

References
  1. "船体 (現代の掃海艦艇を解剖する)". 世界の艦船. 海人社 (427): 76–79. October 1990.
JDS Tsushima (MSO-302)
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