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FERdeBOER · 03-16-08, 05:22 PM

Sorry for refloating this post. I come from this one http://www.subsim.com/radioroom/showthread.php?t=131383 but I think this is a better place to talk about what I've made.

I've been making tests with this:
- O.H. Perry in ENCOM at 10 knots closing to an Akula2 (me) running at 5 knots.
- Seastate 2
- Surface duct, very deep water
- April, mid Atlantic (30N), clear weather
- LwAmi mod v3.08
- SONAR autocrew
- Created a trigger that tells me when I'm detected by the Perry.

These are my first results:

when I'm at 500m deep, I detected the Perry very far (more than 14nm if I remember well) and I was detected at 5 nm.

When just up or bellow the layer I was detected at 8,5 miles and I still not detected the Perry.

At 50 meters I detect the Perry at more than 10 miles (don't remember exactly) an was detected at 8 miles.

At PD I detect the Perry at 14 nm and was detected at 7,5

So I'm comfused

- seems that you're right about ownship's detection capability and shadow zones. But I allways thought that if you're in a shadow zone and you can't detect a ship, the ship can't detect you... but my tests doesn't support this...

- Some players, like Dr.Sid, have stated that approaching just bellow the layer is a very good tactic, even better than doing it deep... but again my tests says that going deeper is better.

I have to test this with suonobuoys under and above the layer, but seems that against a surface ship in deep waters is better going as deep as you can...

My next tests will be with excel open...

EDIT: OK, I've made a new test with conditions changed a bit:
- Instead of my sub being the one detected by the Perry, I set up a line of 12 Akula2 AI subs at 5 knots a different depths and triggers that tell me when a sub is detected by the Perry.
Conclusion: you're right and I was wrong.

The detection depth is more or less the same above the layer (8 miles), but just below the layer it decreases highly to 3.6 miles and, as we go deeper, the range increases again to 7.8 miles at 500 meters.

I will make another test tomorrow, this time also with the subs detection range and will post some screens.
But seems you're right, being just above the layer is a great chance for the sub.

03-16-08, 05:22 PM	#12
FERdeBOER XO Join Date: Mar 2002 Location: Spain Posts: 431 Downloads: 22 Uploads: 1	Sorry for refloating this post. I come from this one http://www.subsim.com/radioroom/showthread.php?t=131383 but I think this is a better place to talk about what I've made. I've been making tests with this: - O.H. Perry in ENCOM at 10 knots closing to an Akula2 (me) running at 5 knots. - Seastate 2 - Surface duct, very deep water - April, mid Atlantic (30N), clear weather - LwAmi mod v3.08 - SONAR autocrew - Created a trigger that tells me when I'm detected by the Perry. These are my first results: when I'm at 500m deep, I detected the Perry very far (more than 14nm if I remember well) and I was detected at 5 nm. When just up or bellow the layer I was detected at 8,5 miles and I still not detected the Perry. At 50 meters I detect the Perry at more than 10 miles (don't remember exactly) an was detected at 8 miles. At PD I detect the Perry at 14 nm and was detected at 7,5 So I'm comfused - seems that you're right about ownship's detection capability and shadow zones. But I allways thought that if you're in a shadow zone and you can't detect a ship, the ship can't detect you... but my tests doesn't support this... - Some players, like Dr.Sid, have stated that approaching just bellow the layer is a very good tactic, even better than doing it deep... but again my tests says that going deeper is better. I have to test this with suonobuoys under and above the layer, but seems that against a surface ship in deep waters is better going as deep as you can... My next tests will be with excel open... EDIT: OK, I've made a new test with conditions changed a bit: - Instead of my sub being the one detected by the Perry, I set up a line of 12 Akula2 AI subs at 5 knots a different depths and triggers that tell me when a sub is detected by the Perry. Conclusion: you're right and I was wrong. The detection depth is more or less the same above the layer (8 miles), but just below the layer it decreases highly to 3.6 miles and, as we go deeper, the range increases again to 7.8 miles at 500 meters. I will make another test tomorrow, this time also with the subs detection range and will post some screens. But seems you're right, being just above the layer is a great chance for the sub. __________________ Hay dos tipos de buques: los submarinos... y los blancos. There are two types of ships: the subs... and the targets. Last edited by FERdeBOER; 03-16-08 at 07:12 PM.