I-315 Submarine
Continuation of the evolution of the I-305 design. The I-315 class is bigger and more powerful than the I-310 class, being similar in size to the I-400 and I-402 classes. The I-315 was designed for the purpose of attacking and sinking other submarines, surface combatants and merchant vessels and it is the first patrol submarine of the Imperial Japanese Navy that does not carry any kind of defensive or offensive guns, relying solely on the deadly Type 3 torpedoes and the ability to remain submerged for long periods of time.
Date: 1947
Type: Oceanic
Length: 130.0m
Beam: 11.2m
Draft: 12.0m
Crush depth: 317.5m
Light Displacement 6591t
Loaded Displacement 7896t
Full Displacement 8736t
wt fuel&batts: 3050t
Reserve buoyancy: 10%
Armament:
- 8 x 533mm (bow)
- 80 tons for mines or reload torpedoes
ElecHP: 36000hp
DieselHP: 11500hp
Speed:
- Max Surf Speed: 16.1 knots
- Max Sub Speed: 22.8 knots
Range:
- Surfaced: 22,311nm@10 knots
- Submerged: 800nm@5 knots
Tons Oil: 1225.0t
Tons Battery: 1825.0t
Miscellaneous Weight: 700 tons
Crew: 193
- 48 Type 3 torpedoes (= 8 in the tubes + 40 from the 80 tons for 'mines or reload torpedoes', 20 in the upper room and 20 in the lower room), 8 idle positions to permit withdrawal of torpedoes from tubes for servicing (16 tons miscellaneous).
- Diesel-electric drive.
- Main electric engines output: 35,000 shp.
- Silent running engines output: 1,000 shp.
- Surface speed: (diesel-electric) 16.1 knots, (battery-electric) 23.4 knots.
- Submerged speed: (silent running engines) 6.9 knots, (battery-electric) 22.6 knots, (diesel-electric + Ninjatousaya) 12 knots.
- Range Surfaced (diesel-Electric): 27,569nm@9 knots, 22,331nm@10 knots, 15,570nm@12 knots, 9,925nm@15 knots.
- Range Submerged (batteries, silent running engines): 2,264nm@3 knots, 800nm@5 knots, 547nm@6 knots.
- Range Submerged (batteries, main engines): 292nm@8 knots, 172nm@10 knots, 56nm@15 knots.
- Range Submerged (diesel-electric + Ninjatousaya): 27,150nm@6 knots, 15,050nm@8 knots, 9,450@10 knots, 8,400nm@12 knots.
- Endurance: (surfaced, diesel) 92 days and 23 hours @ 10 knots, (submerged, batteries) 6 days and 16 hours @ 5 knots.
- Diving depth: 417 feet
- Emergency Depth: 667 feet
- Crush Depth: 1042 feet
- 700 tons Miscellaneous weights breakdown:
--- 30 tons for electric torpedo reloading system.
--- 20 tons for air-powered piston ejection pumps.
--- 5 tons for torpedo service material.
--- 16 tons for 8 idle torpedo positions in the torpedo rooms (4 upper, 4 lower) for torpedo servicing.
--- 10 tons for Ninjatousaya System.
--- 120 tons for sonar+ system, hydrophones, air search radar, air/surface radar and radar warning receiver.
--- 185 tons for defense countermeasures, 'camouflage' and sound-isolation.
--- 66 tons for air condition system.
--- 30 tons for 600 oxygen bottles (50 l, 150 atm, about 901 hours of oxygen total).
--- 10 tons for CO2 removal system + Soda lime.
--- 66 tons for damage control and fire suppression systems.
--- 20 tons for demagnetization cables.
--- 15 tons for safety and rescue equipment.
--- 15 tons for yatai mobile food stall.
--- 20 tons for pachinko parlor.
--- 15 tons for karaoke facilities + Kobe Cola vending machines.
--- 20 tons for officer's lounge.
--- 10 tons for deep freeze unit.
--- 5 tons for desalinization gear.
--- 12 tons for crew comforts (toilets, showers, board games, puzzles, playing cards, dice games, etc.)
--- 10 tons for improved control surfaces.