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Type IIa U-boat (Highly realistic)

With this creation I've tried to make the most realistic type IIa U-boat I could. The systems aren't super complicated but I still recommend reading the rest of the description so you can have an easier time using this creation.


1. Realistic exterior.
2. Realistic interior.
3. Realistic fire control systems and weapons.
4. Hydrophone.
5. AA gun.
6. Realistic engines.
7. Diving equipment.
8. Repair equipment.
9. Realistic operation.
10. Depth finder.
11. Torpedo loading hatch.
12. Emergency buoy.
13. Auto depth hold.
14. Electric compressor.
15. Crush depth


1. Power switch in the engine room behind the port e motor.
2. Open the air intake, fuel valves and exhaust output valves in the engine room.
3. Open the starting air valve and wait for the starting air manifold pressure to rise above 25 atm then you can turn the starting air off.
4. Turn on the engine start switch and increase the throttle slightly.
5. When the engines start, engage the clutches.


1. Turn on the motor/generator power on the e motor panels.
3. Make sure that the starting contactor is off.
4. If you have done it correctly the submarine will be slower and the battery's will start charging.


If you are playing in multiplayer it is recommended to turn on the alarm to notify the crew.
1. Open the fwd vents in the torpedo room above the torpedo tubes.
2. Open the stern and ballast tank 2 vents in the control room.
3. If using the auto depth hold set the depth you want to hold (positive numbers) if not you will need to control the planes manually.
4. Close the air intake in the engine room.
5. Close the exhaust output valves in the engine room.
6. Turn on the e motors.
7. Take out the diesel engine clutch.


1. Close the ballast vents.
2. Open the blow valve in the control room.
3. If using the auto depth hold set the depth to 0 to turn it off.
4. After surfacing open the valves that you closed before diving.
5. Start the diesel engines turn off the e motors.
6. Start refilling compressed air by turning on the electric compressor.
7. When the ship is floating normally you can stop blowing the tanks.


When you spawn in the boat there will be no torpedoes loaded the reason why I did this was because I wanted to let people chose what and how many torpedoes they want to use. This means that you will either have to use the selection grid to take the torpedoes form my g7 torpedo set and put them into the submarine or use the version of my type IIa with preloaded torpedoes.
Torpedoes were loaded in the torpedo tubes and in the torpedo room totaling 5 torpedoes.


1. Flood the torpedo tubes you want to use, when flooded the internal tube hatches will lock (open the torpedo tube vents, drain/fill valves and turn on the compressed air fill button).
2. Open the flooded torpedo tube doors.
3. Tell the fire control system in the control room under the chart table how you will use the torpedoes.
Select which sight you will be using attack periscope, UZO or observation periscope.
Tell the system which torpedoes you will be using (if you set it to position 4 it will activate spread shot mode).
If firing a spread shot sellect the combination of tubes that you will be using.
Lastly select which trigger you will be using the trigger on the deck on the UZO column or the trigger inside the conning tower. You can use the manual firing levers on the torpedo tubes but you don't have to.
4. In the conning tower turn on the optic follow up or set the heading to the target manually, although I would recommend just turning on the optic follow up.


1. Using the periscope look at the target or set the heading to the target.
2. Press the launch button.


1. Enter the enemy targets speed kn.
2. Enter the enemy targets angle on bow.
3. Enter the enemy targets range hm.
4. Look at the target using the periscope or set the heading to the target.
5. Press the launch button.


Speed can be calculated by putting the periscope in front of the enemy ship then when the front of the ship passes the center vertical line start the timer. When the stern of the enemy ship passes over the same vertical line stop the timer. Then take the ships length and divide it by the time that the ship took after that take that value and multiply it by 1.8. This one of many ways to calculate tgt speed.


To figure out range you have a laser range finder it's not a realistic system but because I couldn't make an optical range finder I just went with it.


The easiest way to figure out the AOB is to imagine that you are on the enemy ship looking forward then you turn left or right to look at your sub the amount of degrees that you turn is the AOB. Because how I've done the system this value doesn't have to be very percise.


Note that the AOB should be as close to 90 degrees as possible to get the most accurate hit so take your time to position your sub.

The type IIa does not have a UZO.

When using electric torpedoes don't forget to charge them and set the depth before firing.

For a spread shot you will also need to set the enemy ships length.

From testing I was able to hit a moving target ship from about 3.2 km with 2 torpedoes in a simulated attack, so accuracy is decent, but it still has issues which I want to fix.


1. Drain torpedo tube, open drain/fill valve open the compressed air blow valve, make sure to keep external torpedo tube doors and vents closed (when drained the tube doors will unlock).
2. Fold the beds.
3. Pick up a torpedo using the torpedo loading rail, by aligning the rail and lowering it down, if needed attach a rope to the end of the torpedo and rail.
4. Open the internal torpedo tube door.
5. Align the torpedo loading rail with the torpedo tube.
6. Using the hand crank push the torpedo into the tube.


High physics is recommended, medium will still work fine, low will work if you won't be loading torpedoes.

Not designed for use with infinite electric.

All of the lights inside the sub are spotlights so the lighting will be worse but in multiplayer the lights won't glitch through the walls of the submarine, thus not giving away your position.


https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3001543907

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1717481364

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2793174795

If you like this creation it would be nice if you left a like.

If you have any questions or find an issue with the creation feel free to comment.