Sonar Torperdos - How to evade as ship

[Maiskolben]

I played a few scenarios with/against submarines. It is pretty clear that making sure you hit and shooting first (wtf 40 knot speed submarine) is the safest solution. What do you do against Torpedos fired at range when you are a slower surface ship?

Use noise maker and 90° angle movement? How far away from the projected movement of the torpedo? Can i use torpedos as interceptors?

[Wiz33]

Run away, not directly opposite but at an angle and drop noisemaker or deploy towed decoy if available

[Maiskolben]

Originally posted by Wiz33:

Run away, not directly opposite but at an angle and drop noisemaker or deploy towed decoy if available

But how far (best guess)? In my case torpedos are shot at max range which can take a few minutes. Noisemake don't live that long.

[Bobfromacounting]

Originally posted by Wiz33:

Run away, not directly opposite but at an angle and drop noisemaker or deploy towed decoy if available

I can't see the torpedo's with sona untill It's to late, can't even turn the ship.

[Александр мясной молот]

Originally posted by Maiskolben:

Originally posted by Wiz33:

Run away, not directly opposite but at an angle and drop noisemaker or deploy towed decoy if available

But how far (best guess)? In my case torpedos are shot at max range which can take a few minutes. Noisemake don't live that long.

You can divide distance to a target by torpedo speed and you will get time before it hits or just guesstimate based on experience. Also make sure to disable engine and sonar once you deploy noisemakers and get out of torpedo's way.

[Maiskolben]

Originally posted by Александр мясной молот:

Originally posted by Maiskolben:

But how far (best guess)? In my case torpedos are shot at max range which can take a few minutes. Noisemake don't live that long.

You can divide distance to a target by torpedo speed and you will get time before it hits or just guesstimate based on experience. Also make sure to disable engine and sonar once you deploy noisemakers and get out of torpedo's way.

How far away would you move to the side? Or is hiding/misdirection the only option even if you have ~10 minutes time to evade even if the submarine cannot see you anymore?

[Petrus Romanus]

Noisemakers are kind of... misleading.

Pun absolutely intended.

Passive sonar works by homing on amplitude. But it is difficult to do with receivers the size of a torpedo.

Torpedoes generally use active sonar which works quite differently. It sends out a ping and then waits for a return at that specific frequency, then heads in the direction of the return.

So a noisemaker isn't actually making a sound that the torpedo homes on, it is masking the sound of the echo return.

Knowing this should reveal how to use them. Make a screen, point your stern (or bow) in the direction of the incoming fish, try to be out of the torpedo's "detection cone" when it passes through.

And pray. Because it's a little timing, a little strategy, and 99% luck.

[Maiskolben]

Originally posted by Petrus Romanus:

Noisemakers are kind of... misleading.

Pun absolutely intended.

Passive sonar works by homing on amplitude. But it is difficult to do with receivers the size of a torpedo.

Torpedoes generally use active sonar which works quite differently. It sends out a ping and then waits for a return at that specific frequency, then heads in the direction of the return.

So a noisemaker isn't actually making a sound that the torpedo homes on, it is masking the sound of the echo return.

Knowing this should reveal how to use them. Make a screen, point your stern (or bow) in the direction of the incoming fish, try to be out of the torpedo's "detection cone" when it passes through.

And pray. Because it's a little timing, a little strategy, and 99% luck.

I had thought of them like flares. Bigger target = more important. In this case ~90° to the sider would make more sense. But as a "screen" behind and to the side is probably better.

Any idea how far (distance/angle) the cone of an active torpedo reaches approx.? I don't think i found this information in the encyclopedia.

Edit: I still am talking about the scenario that a submarines shoots its torpedo at a range of maybe ~15nm. So quit far away and these were only moving around 20 knots or so. Probably fired it because my ships sonars were active.