Ships of the Imperial Japanese Navy
September, 2024
The IJN favors specialized designs for its fleet, and because of this has two different cruiser designs, one for missile combat and one for close-in beam combat. While this strategy has allowed the IJN to produce designs that are optimized for their intended role, it has also reduced the number of cruisers it could deploy due to the necessity of switching its largest shipyard from producing one cruiser to the other. The IJN has won approval from the Imperial government for an expansion of shipyard capacity so that beam and missile cruisers can be built simultaneously.
The IJN is largely satisfied with its current designs, in spite of its recent loss during the Battle of the Moon. The IJN’s highest leaders were largely successful in blaming the loss on the civilian government and the impossible situation it was placed in by those leaders, and as a result the Navy sees no reason to alter its designs.
The Navy is currently in the middle of a large-scale program to improve its laser weaponry, and plans on refitting its cruisers and destroyers with the new weaponry once it is developed.
Warships
Akagi class Cruiser 6000 tons 584 Crew 689.2 BP TCS 120 TH 240 EM 450
2000 km/s Armour 3-29 Shields 15-300 Sensors 32/0/0/0 Damage Control Rating 1 PPV 32
Annual Failure Rate: 288% IFR: 4% Maintenance Capacity 72 MSP
Nuclear Pulse Engine (6) Power 40 Efficiency 0.90 Signature 40 Armour 0 Exp 5%
Fuel Capacity 150,000 Litres Range 50.0 billion km (289 days at full power)
Beta R300/13.5 Shields (10) Total Fuel Cost 135 Litres per day
Triple 12cm DP Visible Light Laser Turret (2x3) Range 80,000km TS: 7200 km/s Power 12-6 RM 2 ROF 10 4 4 2 2 1 1 1 1 0 0
DP Fire Control S06 48-7200 (2) Max Range: 96,000 km TS: 7200 km/s 90 79 69 58 48 38 27 17 6 0
Pebble Bed Reactor (2) Total Power Output 18 Armour 0 Exp 5%
Active Search Sensor S48-R40/100 (1) GPS 1920 Range 19.2m km Resolution 40
LG Thermal Sensor TH4-32/100 (1) Sensitivity 32 Detect Sig Strength 1000: 32m km
The Akagi is the IJN’s principle close-range combatant. Like the Zuikaku destroyer, the Akagi is equipped with the Triple 12 cm Laser Turret and a dual purpose fire control that served as both an anti-ship and an anti-missile targeting system. Because of the size and mass of the turret the cruiser can only carry two, but the IJN feels that the flexibility imparted by the turret overcomes the lower overall number of weapons.
All Akagi class units were upgraded to Akagi Mark 2’s.
Akagi Mk 2 class Cruiser 6000 tons 580 Crew 790.6 BP TCS 120 TH 360 EM 540
3000 km/s Armour 4-29 Shields 18-300 Sensors 32/0/0/0 Damage Control Rating 1 PPV 32
Annual Failure Rate: 288% IFR: 4% Maintenance Capacity 82 MSP
Mitsubishi Ion Engine (6) Power 60 Efficiency 0.80 Signature 60 Armour 0 Exp 5%
Fuel Capacity 150,000 Litres Range 56.3 billion km (217 days at full power)
Beta R300/13.5 Shields (12) Total Fuel Cost 162 Litres per day
Triple 12cm DP Visible Light Laser Turret (2x3) Range 80,000km TS: 7200 km/s Power 12-6 RM 2 ROF 10 4 4 2 2 1 1 1 1 0 0
DP Fire Control S06 48-7200 (2) Max Range: 96,000 km TS: 7200 km/s 90 79 69 58 48 38 27 17 6 0
GC Fast Reactor (2) Total Power Output 18 Armour 0 Exp 5%
Active Search Sensor S48-R40/100 (1) GPS 1920 Range 19.2m km Resolution 40
LG Thermal Sensor TH4-32/100 (1) Sensitivity 32 Detect Sig Strength 1000: 32m km
The Mark 2 version includes the replacement of the nuclear pulse engines with Ion engines, and the replacement of the older high density uranium armor with composite armor. The replacement of the armor belt allowed the designers to upgrade the armor belt’s thickness, improving the survivability of the ship in close combat.
All existing units of this class were destroyed by the Reich and the Alliance during the Battle of the Moon. Since then, the IJN has launched nine new units of this class.
Kongo class Missile Cruiser 6000 tons 549 Crew 763.6 BP TCS 120 TH 240 EM 450
2000 km/s Armour 4-29 Shields 15-300 Sensors 32/0/0/0 Damage Control Rating 1 PPV 24
Annual Failure Rate: 288% IFR: 4% Maintenance Capacity 80 MSP
Magazine 274
Nuclear Pulse Engine (6) Power 40 Efficiency 0.90 Signature 40 Armour 0 Exp 5%
Fuel Capacity 150,000 Litres Range 50.0 billion km (289 days at full power)
Beta R300/13.5 Shields (10) Total Fuel Cost 135 Litres per day
Standard Missile Launcher 03-045 (8) Missile Size 3 Rate of Fire 45
Missile Fire Control FC48-R40/100 (2) Range 57.6m km Resolution 40
Active Search Sensor S48-R40/100 (1) GPS 1920 Range 19.2m km Resolution 40
LG Thermal Sensor TH4-32/100 (1) Sensitivity 32 Detect Sig Strength 1000: 32m km
The Kongo is the IJN’s primary missile combatant. This design has a large broadside of anti-ship missiles but must be escorted by anti-missile platforms at all times due to its lack of anti-missile weaponry.
The failure of the IJN’s Kongo class to destroy any Russian ships during the Battle of Titan was blamed on the IJN’s missile of the time, and as a result the Standard Missile was replaced with the Long Lance Anti-Ship missile.
All units of the Kongo class were upgraded to Kongo Mark 2’s.
Kongo Mk 2 class Missile Cruiser 5950 tons 549 Crew 852.4 BP TCS 119 TH 360 EM 450
3025 km/s Armour 5-29 Shields 15-300 Sensors 32/0/0/0 Damage Control Rating 1 PPV 24
Annual Failure Rate: 283% IFR: 3.9% Maintenance Capacity 90 MSP
Magazine 274
Mitsubishi Ion Engine (6) Power 60 Efficiency 0.80 Signature 60 Armour 0 Exp 5%
Fuel Capacity 150,000 Litres Range 56.7 billion km (217 days at full power)
Beta R300/13.5 Shields (10) Total Fuel Cost 135 Litres per day
Standard Missile Launcher 03-045 (8) Missile Size 3 Rate of Fire 45
Missile Fire Control FC48-R40/100 (2) Range 57.6m km Resolution 40
Active Search Sensor S48-R40/100 (1) GPS 1920 Range 19.2m km Resolution 40
LG Thermal Sensor TH4-32/100 (1) Sensitivity 32 Detect Sig Strength 1000: 32m km
The Mark 2 version of the Kongo includes a refit of the engine spaces and armor belt, as with the Akagi class. The Kongo Mark 2’s of the fleet performed well during the Battle of the Moon, and the IJN has since built more ships of this class.
Eleven units of this class are in service as of September 2024, and four more are under construction.
Zuikaku class Escort 3500 tons 328 Crew 410.8 BP TCS 70 TH 160 EM 240
2285 km/s Armour 3-20 Shields 8-300 Sensors 8/0/0/0 Damage Control Rating 1 PPV 16
Annual Failure Rate: 98% IFR: 1.4% Maintenance Capacity 73 MSP
Nuclear Pulse Engine (4) Power 40 Efficiency 0.90 Signature 40 Armour 0 Exp 5%
Fuel Capacity 50,000 Litres Range 28.6 billion km (144 days at full power)
Beta R300/13.5 Shields (5) Total Fuel Cost 68 Litres per day
Triple 12cm DP Visible Light Laser Turret (1x3) Range 80,000km TS: 7200 km/s Power 12-6 RM 2 ROF 10 4 4 2 2 1 1 1 1 0 0
DP Fire Control S06 48-7200 (1) Max Range: 96,000 km TS: 7200 km/s 90 79 69 58 48 38 27 17 6 0
Pebble Bed Reactor (1) Total Power Output 9 Armour 0 Exp 5%
Active Search Sensor S48-R40/100 (1) GPS 1920 Range 19.2m km Resolution 40
Sm Thermal Sensor TH1-8/100 (1) Sensitivity 8 Detect Sig Strength 1000: 8m km
The Zuikaku class was designed and built to escort the vulnerable Kongo class and protect it from enemy missiles. It performed well against Soviet missiles in the Battle of Titan, and although the Zuikaku’s of the Home Fleet were unable to protect the Akagi cruisers of the beam strike group during the Battle of the Moon, this has been attributed to the overwhelming force of enemy missiles, rather than any deficiency in the basic design.
All Zuikaku’s have been refitted to the Mark 2 standard.
Zuikaku Mk 2 class Escort 3500 tons 328 Crew 471.4 BP TCS 70 TH 240 EM 240
3428 km/s Armour 4-20 Shields 8-300 Sensors 8/0/0/0 Damage Control Rating 1 PPV 16
Annual Failure Rate: 98% IFR: 1.4% Maintenance Capacity 84 MSP
Mitsubishi Ion Engine (4) Power 60 Efficiency 0.80 Signature 60 Armour 0 Exp 5%
Fuel Capacity 50,000 Litres Range 32.1 billion km (108 days at full power)
Beta R300/13.5 Shields (5) Total Fuel Cost 68 Litres per day
Triple 12cm DP Visible Light Laser Turret (1x3) Range 80,000km TS: 7200 km/s Power 12-6 RM 2 ROF 10 4 4 2 2 1 1 1 1 0 0
DP Fire Control S06 48-7200 (1) Max Range: 96,000 km TS: 7200 km/s 90 79 69 58 48 38 27 17 6 0
Pebble Bed Reactor (1) Total Power Output 9 Armour 0 Exp 5%
Active Search Sensor S48-R40/100 (1) GPS 1920 Range 19.2m km Resolution 40
Sm Thermal Sensor TH1-8/100 (1) Sensitivity 8 Detect Sig Strength 1000: 8m km
As with the bigger ships, the Zuikaku Mark 2 involves a replacement of the engine spaces and the armor belt.
Currently, the IJN Command Staff is debating the wisdom of refitting the Zuikaku with the Mark 2 turrets now in development, or leaving them as is and replacing them over time with a larger and more capable escort ship.
There are thirty-six Zuikaku Mark 2’s in service with the IJN as of September 2024.
Planetary Defense
Homeland Defense Center class Missile Base 19400 tons 1305 Crew 1359.2 BP TCS 388 TH 0 EM 0
Armour 11-64 Sensors 1/48 Damage Control Rating 0 PPV 96
Troop Capacity 5 Divisions Magazine 846
PDC Missile Launcher 12-090 (8) Missile Size 12 Rate of Fire 90
Missile Fire Control FC48-R40/100 (1) Range 57.6m km Resolution 40
ICBM (24) Speed: 1000 km/s End: 0 minutes Range: 0m km Warhead: 36 MR: 10 Size: 12
Active Search Sensor S48-R40/100 (1) GPS 1920 Range 19.2m km Resolution 40
This design is classed as a Planetary Defence Centre and can be pre-fabricated in 39 sections
This is Imperial Japan’s planetary defense base. Currently, there are fourteen in service.
Civilian Ships
Colony Ship class Colony Ship 3450 tons 128 Crew 613.4 BP TCS 69 TH 80 EM 0
1159 km/s Armour 1-20 Shields 0-0 Sensors 8/0/0/0 Damage Control Rating 1 PPV 0
Annual Failure Rate: 95% IFR: 1.3% Maintenance Capacity 111 MSP
Colonists 50000
Nuclear Pulse Engine (2) Power 40 Efficiency 0.90 Signature 40 Armour 0 Exp 5%
Fuel Capacity 50,000 Litres Range 29.0 billion km (289 days at full power)
Sm Thermal Sensor TH1-8/100 (1) Sensitivity 8 Detect Sig Strength 1000: 8m km
This design is classed as a freighter for maintenance purposes
Freighter Mk 2 class Freighter 3450 tons 103 Crew 183.4 BP TCS 69 TH 120 EM 0
1739 km/s Armour 1-20 Shields 0-0 Sensors 8/0/0/0 Damage Control Rating 1 PPV 0
Annual Failure Rate: 95% IFR: 1.3% Maintenance Capacity 33 MSP
Cargo 25000
Mitsubishi Ion Engine (2) Power 60 Efficiency 0.80 Signature 60 Armour 0 Exp 5%
Fuel Capacity 50,000 Litres Range 32.6 billion km (217 days at full power)
Sm Thermal Sensor TH1-8/100 (1) Sensitivity 8 Detect Sig Strength 1000: 8m km
This design is classed as a freighter for maintenance purposes
Hyuga class Science Vessel 4000 tons 344 Crew 842.2 BP TCS 80 TH 360 EM 0
4500 km/s Armour 3-22 Shields 0-0 Sensors 32/0/4/0 Damage Control Rating 3 PPV 0
Annual Failure Rate: 42% IFR: 0.6% Maintenance Capacity 1395 MSP
Mitsubishi Ion Engine (6) Power 60 Efficiency 0.80 Signature 60 Armour 0 Exp 5%
Fuel Capacity 150,000 Litres Range 84.4 billion km (217 days at full power)
Active Search Sensor S48-R40/100 (1) GPS 1920 Range 19.2m km Resolution 40
LG Thermal Sensor TH4-32/100 (1) Sensitivity 32 Detect Sig Strength 1000: 32m km
Gravitational Survey Sensors (4) 4 Survey Points
Ise MK 2 class Troop Transport 3500 tons 242 Crew 371.8 BP TCS 70 TH 360 EM 360
5142 km/s Armour 2-20 Shields 12-300 Sensors 8/0/0/0 Damage Control Rating 1 PPV 0
Annual Failure Rate: 98% IFR: 1.4% Maintenance Capacity 66 MSP
Troop Capacity 1 Divisions
Mitsubishi Ion Engine (6) Power 60 Efficiency 0.80 Signature 60 Armour 0 Exp 5%
Fuel Capacity 50,000 Litres Range 32.1 billion km (72 days at full power)
Beta R300/13.5 Shields (8) Total Fuel Cost 108 Litres per day
Sm Thermal Sensor TH1-8/100 (1) Sensitivity 8 Detect Sig Strength 1000: 8m km
Survey Ship class Geosurvey Ship 2100 tons 196 Crew 461.4 BP TCS 42 TH 120 EM 0
2857 km/s Armour 1-14 Shields 0-0 Sensors 32/0/0/3 Damage Control Rating 1 PPV 0
Annual Failure Rate: 35% IFR: 0.5% Maintenance Capacity 137 MSP
Nuclear Pulse Engine (3) Power 40 Efficiency 0.90 Signature 40 Armour 0 Exp 5%
Fuel Capacity 100,000 Litres Range 95.2 billion km (385 days at full power)
LG Thermal Sensor TH4-32/100 (1) Sensitivity 32 Detect Sig Strength 1000: 32m km
Geological Survey Sensors (3) 3 Survey Points
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