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Old 10-20-2019, 04:21 AM   #1
gurudennis
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Nuke Major exploit of trim mechanics in 0.20

How found: play testing

Game version: 0.20 (new - did not happen in 0.19)

Setup: any

Steps to reproduce:

1. Enable diesel engines and set any speed forward (or stop if you wish).
2. Adjust the trim tank until the boat is stable at a depth of exactly 10.1 meters.
3. The diesel is still running, not flooded (!).

Effects:

At this point, you can set the speed up to Full on diesel, thus achieving almost 15 knots at the depth where only the RDF ring is barely protruding above the surface of the water. The air compressor also works.

This is for all practical purposes equivalent to having a snorkel, and presumably not intentional as a feature.

Bonus "WTF of the day":

The maximum speed of a Tribal class destroyer at which it can still use ASDIC is approximately 14 kts in the game (18 kts in real life). This is slower (in the game) than the maximum speed at which a boat can travel effectively submerged at Full speed on diesels in game version 0.20. Thus, one can literally run away from escort pursuit while submerged - a feat only normally possible in a nuclear submarine. This has been empirically confirmed by play testing.

Special thanks: rocketdrive for helping flesh out the concept.

@Developers: Please kindly fix this exploit for the sake of maintaining immersion in the game. Thanks in advance.

Last edited by gurudennis; 10-20-2019 at 04:44 AM.
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Old 10-20-2019, 12:31 PM   #2
Lost At Sea
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Wow ! This is odd, I have somehow faced quite the opposite to your diesel bug !
Now unable to run deck awash with diesel.

The diesel engine will flood at 7m under manual control while if ordering the bot to hit 7m, it will switch to electric.
This would not happen on previous version as as recall.
Unable to find the "sweet spot" for deck awash so far. Doesn't seem to be any with latest version.

Side note, loving the addition of trims.

Cheers,
Lost
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Old 10-20-2019, 01:22 PM   #3
Onkel Neal
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Nice catch, I will check into this.

PS: Very well-structured bug report
__________________
There have been a lot of U-boat games in the past but nothing like Wolfpack.
Good hunting and don't forget to close the hatch!

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Old 01-20-2020, 10:46 PM   #4
gurudennis
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Bump - please consider fixing in the next patch.
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Old 01-29-2020, 04:11 AM   #5
oldhasu1
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IDK if this is a bug or a feature but here is how we do it on our boat:
1)Trim it (optional, because the boat has reasonable trim by default)

2)Flood main ballasts
3)Blow main ballasts to exactly 37


By doing that you achieve very convenient state in which you can travel at almost 18kn speed on diesel with straight dive rudders. By putting the front rudder all the way down (dive) and rear all the way up (surface) you get 16kn speed with ability to use hydrophone. Very cool, huh? But not sure if fair.

Last edited by oldhasu1; 01-29-2020 at 04:21 AM.
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Old 01-29-2020, 08:29 AM   #6
Fidd
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Presumably they'll have to be damn careful as to how this is fixed, so as not to preclude the use of Shnorkels proper at some point in the future? Mind you, as far as I recall, shnorkels couldn't attain anything like full surface speed owing to the forces exerted by the water on them causing them to fail. Anyone know the limiting speed?
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Old 01-30-2020, 09:26 PM   #7
GreyLynx
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Ref: https://uboat.net/technical/schnorchel.htm

6 knots was the max speed for the VII and IX types, otherwise the air mast would break off.

Actually, the diesel engine gets flooded when the air intake valve is below the waterline (at a depth of 8 meters). So Deck Awash depth shouldn't be lower than 8 m.

With the 9-meter long snorkel, the air intake valve is higher. Therefore snorkel depth is around 14 m.

At present time, the diesel engine gets flooded at 10.3 m, which is in-between the 2 values. https://www.subsim.com/radioroom/ima...xclamation.png
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