sitting on the bottom

[Phil]

is sitting on the bottom an effective technique of evasion or is it to loud when you hit the bottom? saw it the other day in the movie enemy below

[Corrupt_File]

It's not modelled in the game at all unfortunately.

[Brag]

It won't help you much if any. But if it is as deep as you can go, moving a few meters off the bottom is the thing to do. If for some reason you need to touch bottom, do it slowly and gently.:yep:

[mookiemookie]

It does not help at all. I know this from experience. They will still ping the crap outta you and blast you to kingdom come.

Shame it's not modelled. Ah well.

[AVGWarhawk]

It does not help at all. I know this from experience. They will still ping the crap outta you and blast you to kingdom come.

Shame it's not modelled. Ah well.

Yep, I'm with Mookie on this one! There I was on patrol #2 at 96m bottomed out. I was pinged to death and then DC'd to death:cry: . No dice for hanging on the bottom.:down: I stay were it is REALLY DEEP!

[High Voltage]

If you can rest on the bottom -------

YOU'RE NOT DEEP
ENOUGH!!!!

;)

[Iron Budokan]

What about running shallow? At the beginning of the war the sub commanders used to run at periscope depth to evade DDs because they knew their listening gear couldn't operate at that angle. Is that modeled?

[Corrupt_File]

What about running shallow? At the beginning of the war the sub commanders used to run at periscope depth to evade DDs because they knew their listening gear couldn't operate at that angle. Is that modeled?

From experience, I'd conclude no...

[Eagle Eye]

They've always heard me at periscope depth. I've learned my lesson about hunting convoys in shallow waters.

[johnno74]

Active sonar "pings" are actually reflected by density changes - they don't bounce back towards the sender from your hull, they bounce back from the air space inside the pressure hull

So, in reality, sitting on the bottom shouldn't help you evade active sonar.

[mookiemookie]

It does not help at all. I know this from experience. They will still ping the crap outta you and blast you to kingdom come.

Shame it's not modelled. Ah well.

Yep, I'm with Mookie on this one! There I was on patrol #2 at 96m bottomed out. I was pinged to death and then DC'd to death:cry: . No dice for hanging on the bottom.:down: I stay were it is REALLY DEEP!

That's exactly how it happened to me. I made a big mistake, attacking this convoy off the northern coast of Scotland. When it comes time to evade, I ping the depth...

"Depth under keel is 50 meters, sir!" :damn: :dead:

During my evasion maneuvers I planted the boat on the bottom a bit too hard, tearing out the keel and causing major flooding. The DD's just finished me off while I sat helpless at the bottom. It was my 2nd patrol, too. I guess that makes me a full fledged memeber of the club.

Lesson learned: always know how much real estate you have under you before you attack!

[Jimbuna]

Lesson learned: always know how much real estate you have under you before you attack!

AMEN :lol: :up:

[AVGWarhawk]

It does not help at all. I know this from experience. They will still ping the crap outta you and blast you to kingdom come.

Shame it's not modelled. Ah well.
Yep, I'm with Mookie on this one! There I was on patrol #2 at 96m bottomed out. I was pinged to death and then DC'd to death:cry: . No dice for hanging on the bottom.:down: I stay were it is REALLY DEEP!
That's exactly how it happened to me. I made a big mistake, attacking this convoy off the northern coast of Scotland. When it comes time to evade, I ping the depth...

"Depth under keel is 50 meters, sir!" :damn: :dead:

During my evasion maneuvers I planted the boat on the bottom a bit too hard, tearing out the keel and causing major flooding. The DD's just finished me off while I sat helpless at the bottom. It was my 2nd patrol, too. I guess that makes me a full fledged memeber of the club.

Lesson learned: always know how much real estate you have under you before you attack!


And yet another member of the 2nd patrol club.....man, it is starting to look like a gang:o

[GT182]

It's better to move off and away at 1kt to try to evade. Sitting on the bottom just makes you an easy target.

[ref]

They've always heard me at periscope depth. I've learned my lesson about hunting convoys in shallow waters.

Most people keeps confusing sensors, the early sonar is less effective because it's cone is pointing a bit down, but don't forget that the ships also has hydrophones which aren't limited in its angles, thay can pick you on passive by listening to your engines.

Ref

[Sailor Steve]

is sitting on the bottom an effective technique of evasion or is it to loud when you hit the bottom? saw it the other day in the movie enemy below
Active sonar "pings" are actually reflected by density changes - they don't bounce back towards the sender from your hull, they bounce back from the air space inside the pressure hull

So, in reality, sitting on the bottom shouldn't help you evade active sonar.
It's better to move off and away at 1kt to try to evade. Sitting on the bottom just makes you an easy target.
In reality sitting on the bottom had one great effect: depth charges would either go off too shallow, or they would hit the bottom and sit there. Even if they went off on the bottom the blast would be directed upward, rendering the submarine reasonably safe. Several captains reported surviving 12-18 hours of depth-charging by sitting on the bottom. It was an accepted doctrine that a rough seafloor could indeed deflect sonar beams in odd directions, also decreasing the likelihood of detection.

Unfortunately, none of this is modelled in the game.

[Keelbuster]

What about running shallow? At the beginning of the war the sub commanders used to run at periscope depth to evade DDs because they knew their listening gear couldn't operate at that angle. Is that modeled?
This can be quite effective. In medium sea states, you can achieve some stealth by riding at PD. I always begin my evasion at PD, and I only dive if i have to. Visual information is so rich that I always prefer to keep it. When you see them go into their attack run, you can go flank and break right or left, and they often won't hit you with their DCs. You can see which way they turn, and plot a flank evasion course. If necessary, you can take a shot at them (zero gyro, mag pistol). And, if I have to dive, i don't like to go below 40m: i like to be able to see my attacker's course on the surface through the observation scope. THis makes my DC evasion easier. The only time I would go really deep is if a) there's no bottom and b) there are many attackers and no other way out. With 1 or 2 attackers, PD is a good place to be. The other thing is that diving saps speed - by going down to 150m, you waste velocity that could have been spent gaining lateral separation from your attackers. Finally, I like to 'spend' depth during evasion. For instance, in the first DC run, maybe the attacker knows you are at PD, so he sets his charges for min depth. In the evasino run, you drop to 30m and he misses. In his second run, he knows you're at 30, so you drop to 60. In the third you drop to 90, etc. If you drop all the way to 150 in the first attack, you've got nowhere to go but up! Also, if you get hit at that depth, you might just pop. So - my feeling is that you should use depth sparingly. Maybe I'm drifting OT now?

Kb

[danurve]

It's better to move off and away at 1kt to try to evade. Sitting on the bottom just makes you an easy target.

I'm thinking sitting on the bottom in an IX makes you a bigger target. :-j