Souryuu-class Submarine

The Sōryū-class submarines (16SS) are diesel-electric submarines that entered service with the Japan Maritime Self-Defense Force in 2009. The design is an evolution of the Oyashio-class submarine, from which it can most easily be distinguished by its X-shaped tail planes. The Sōryūs have the largest displacement of any submarine used by post war Japan.

The class are fitted with air-independent propulsion based on Kockums Stirling engines license-built by Kawasaki Heavy Industries, allowing them to stay submerged for longer periods of time.

Specifications

 * Type: AIP equipped Diesel Electric Submarine (Hull designation symbol SS)
 * Service Period: 2009-Present
 * Characteristics:
 * Length: 275 feet 7 inches (84 meters)
 * Beam: 29 feet 10 inches (9.1 meters)
 * Draft: 27 feet 11 inches (8.51 meters)
 * Displacement: 3,200 tons (Surfaced); 4,630 tons (Submerged)
 * Crew: 65 (9 officers, 56 enlisted)
 * Propulsion: 2 x Kawasaki 12V 25/25 SB-type diesel engines diesel-electric, 4 x Kawasaki Kockums V4-275R Stirling engines, 1 shaft 3,900hp (2,900 kW) surfaced, 8,000hp (6,000 kW) submerged
 * Range: AIP Endurance: 6,100 nautical miles (11,297 kilometers) at 6.5 knots (12.04 km/h)
 * Speed (Submerged): 20 knots (37.04 km/h)
 * Speed (Surfaced): 13 knots (24.08 km/h)
 * Sensor Suite:
 * ZPS-6F surface/low-level air search radar
 * Hughes/Oki ZQQ-7 Sonar suite: 1 x bow-array, 4 x LF flank arrays and 1 x Towed array sonar
 * Countermeasures:
 * ZLR-3-6 ESM equipment
 * 2 x 3" underwater countermeasure launcher tubes for launching of Acoustic Device Countermeasures (ADCs)
 * Armament:
 * 6 x HU-606 21" torpedo tubes (with 30 reloads for Type 89 torpedoes an UGM-84 Harpoon AShMs)

Unit Run

 * JS Souryuu (SS-501)
 * JS Unryuu (SS-502)
 * JS Hakuryuu (SS-503)
 * JS Kenryuu (SS-504)
 * JS Zuiryuu (SS-505) - undergoing sea trials
 * JS Kokuryu (SS-506) - under construction
 * JS Unnamed (SS-507) - under construction
 * JS Unnamed (SS-508) - under construction