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TC107 Tunacan

Tactical Class Submarine 107, Coalition Shipyards

A tactical battle submarine with easy-to-understand layout and hard-to-master design choices, with the capability to be used for a complete playthrough with a small crew.

Originally posted by some sailor:

The tunacan got all you need and nothing you want.

In an attempts to build a cheap submarine with better fighting capabilities than the Dugong or Barsuk, the coalition reduced the hull design to one main compartment with open ballasts. Only reactor, command and medical are sealed off. The TC107 also only has one single super conductor which is directly powered from the batteries. The saved money directly went into three preinstalled coil guns and searchlight beams in front.

Because of its shape and one single hull compartment, it has been nicknamed "Tunacan".

Most shipsystems take proportionally more power than on comparable submarines. To compensate for high energy fluctuations it got a state-of-the-art smart battery system, which takes up excess energy and supports the reactor on heavy load.

Due to its hull design and open ballast, it is hard to keep the ship dry, but excess water is easily drained once the hull is patched up.
Additionally, having even one airlock flooded already disables the ability to ascend.

For safer passage, the controlroom features a frontal glass dome and periscope which allow for visual steering without sonar. Field tests reveiled though, mudraptors tend to break the dome first to enter the sub, and the controlroom lacks any means of draining water aside from its door.

To keep the ship running outside of the established support routes, it is equipped with proper fabricators and deconstructors, and also capable of getting upgraded up to tier 3 class ship standards.

Sacrificing a lot of hull structure and the second super capacitor, as well as using outdated electric systems leads to an affordable price of only 4750 marks.

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The sub has been tested in vanilla campaign gameplay as starter sub for several missions with a crew of 2 and 3, with and without NPCs. Certain values have been adjusted trying to keep it in balance with other starter submarines.

Advantages:

• open and simple layout
  
• automatic battery subsystem with overvoltage protection
  
• fast charge button in commandroom (load 100% instead of 60% max) disabling overvoltage protection
  
• power consumption and battery charge monitors in command room
  
• airlock controls and battery charge controls in command room
  
• front window and periscope with searchlights for visual navigation
  
• double airlocks
  
• 3 gunmounts with good coverage
  
• open ballasts so water can get drained by ballast pumps
  
• somewhat powerful engines (Force 400 @ 1500kW compared to Barsuk 110 @ 2000kW, Dugong 270 @ 600kW, Orca 480 @ 1500kW)
  
• fabricators and deconstructor
  
• 12 crate shelves
  
• technically tier 3 and could be used from start to end in a campaign.

Disadvantages:

• weak and powerhungry ballast pumps (275m³ at 500kW compared to default 600m³/min at 300kW)
  
• weak and powerhungry small pumps (75m³ at 120kW compared to default 100m³/min at 60kW)
  
• no drainage in command room
  
• slow drainage in reactor room
  
• blind spots bottm front and back
  
• both top cannons can hit the docking port
  
• single superconductor for all weapon systems, only loaded from batteries
  
• lights in the ship require ~250kW (can be turned off)
  
• front searchlights require 400kW in total (can be turned off)
  
• top airlock and docking port use the same compartment
  
• ballast tanks can barely keep neutral with one airlock filled.
  
• crowded and tiny sub overall
  
• limited storage capacity

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From its shipyard entry:

The Tactical Class 107 consists of one big hull compartment, with only some separated rooms to save cost. With one large leak the whole ship can become flooded within mere seconds, though its open ballast allows for fast pruning.

Overall power consumption is above average, but a smart battery system has been installed.

Its main selling points are 3 weapon mounts without blindspots as well as the observation dome for visual navigation.

The TC107 has all you need and nothing you want.