Tinsak-class submarine

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The Tinsak-class submarines are diesel-electric attack submarines operated by the Mirhaime Realm Armada. The first boat in the class (MRASS Bafaas) entered service in 2011. The design is an evolution of the Orsen-class submarine, from which it can most easily be distinguished by its X-shaped stern combination diving planes and rudders. The Tinsak-class have the largest displacement of any submarine in Mirhaimian history.


In 2002, development for a new attack submarine that will act as a replacement to the old Orsen-class that has been in service since 1975 was initialized by Larman Shipbuilding Corporation at the behest of the Realm Armada. Years of testing the seaworthiness of the new hull superstructure, the endurance of the vessel and whether or not its ready to be fielded culminated in the Tinsak-class Attack Submarine, a with a vessel submerged tonnage of over 4,000.

Design details

The vessel is an attack submarine designed for use by the Mirhaimian Realm Armada as a replacement for the aging fleet of Orsen-class which has served with the fleet since 1976

The new dossier for the vessel states a partial single shell structure, cigar-type hull form. This is a design that allows the long side array sonar to be directly fixed to the pressure hull while ensuring the hydrodynamic performance equivalent to that of the teardrop type hull in the low speed range where non-nuclear powered submarines are active. The basic design of the hull is nearly the same as submarines of the Orsen-class laid down from 1977 onwards, but despite the insertion of the AIP section with a length of 11 meters, the overall length is extended by about 2 meters due to the high density of the equipment, but this is a living area.

The curves of the bow and stern have been changed compared to Orsen with the sail having been moved slightly forward, and improvements such as adding a streamlined cover called a fillet to the base.

It can be said that it is a generational cigar type ship type. In addition, by inserting the AIP section, the inside of the ship is divided into 6 sections, and it has been changed to move up and down to the sail from the 1st waterproof section. In addition, the front escape tube and the torpedo loading port were separated in consideration of the dimensions of the personal escape suit (Mk.10) to be equipped in the future .

In order to reduce the target strength (TS), it is the same as the 05SS in that it is equipped with underwater sound absorbing and reflecting materials and the sail is tilted, but in this model, the incident sound is totally reflected in a direction different from the sound source. Materials were developed and the entire hull was to be covered with underwater sound absorbing or reflective material. It is also said that the installation of fillets contributes to the reduction of underwater radiation noise by reducing the generation of noise due to turbulence as well as the reduction of underwater resistance.

The biggest change in appearance is the adoption of the rear rudder device (X rudder). In the past, a cross-shaped rudder with a vertical rudder (vertical rudder) in charge of turning and a horizontal rudder (horizontal rudder) in charge of attitude control was adopted, but in the X rudder, these are installed in a form tilted by 45 degrees. Then, all four rudders are assigned the roles of both turning and attitude control.

This method proved to provide excellent maneuverability, and even if one of the control surfaces is damaged, it can be shared by the other three, this possessing excellent redundancy, and the control surface is less likely to be damaged when landing, sinking, or berthing.

The adoption in this model was aimed at compensating for the increase in size of the ship by improving mobility


General characteristics

  • Type: Attack submarine
  • Displacement: 2,900 tonnes (2,854 long tons; Surfaced); 4,200 t (4,134 long tons; Submerged)
  • Length: 84.0 m (275 ft 7 in)
  • Beam: 9.1 m (29 ft 10 in)
  • Draught: 8.5 m (27 ft 11 in)
  • Propulsion:
  • 2× Larman 12V 25/25 SB-type diesel engines diesel-electric
  • 4× Larman V4-275R Stirling engines
  • 3,900 hp (2,900 kW) surfaced
  • 8,000 hp (6,000 kW) submerged
  • Speed: 13 kn (24 km/h; 15 mph); Surfaced); 20 kn (37 km/h; 23 mph; Submerged)
  • Range: AIP endurance (est.): 6100 nautical miles (11297.2 km; 7060.75 miles) at 6.5 knots (12 km/h; 7.48 mp/h)
  • Complement: 65 (9 officers, 56 enlisted)

Sensors and processing systems:

  • ZPK-6F surface/low-level air search radar
  • MMK-7 Sonar suite: 1× bow-array, 4× LF flank arrays and 1× Towed array sonar

Electronic warfare & decoys:

  • ZLR-3-6 ESM equipment
  • 2× 3-inch underwater countermeasure launcher tubes for launching of Acoustic Device Countermeasures (ADCs)


  • 6 × HU-606 21 in (533 mm) torpedo tubes with 30 reloads for:
  • 1J-387-22 'Typhoon' torpedo
  • Harpoon (missile)
  • Mines