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Old 05-21-21, 07:02 AM   #1
KungPao
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Default Against all odds ( a short AAR )

This is scenario “Against all odds” with RA mod 1.50 beta,. A 688i (San Juan) has to penetrate a Russian SAG and sink Kuznetsov in North Pacific.

I am doing manual TMA in this game. Here is a self implied house rule. To simulate the wire break, I will cut the torpedo’s wire if my speed is greater than 15kts

At the beginning of the scenario, I turn the San Juan’s heading to 270
40 min into the game, I got a lot of noisy contact on the screen, one of the contact was quickly ID as Boris Chilikin AOR. However, shortly after that I got a lot of TIW message. To be safe I decided to break off the contact, re-initiate the attack two hours later



At 0600, San Juan heads to 270 towards Kuznetsov for a while. Initially San Juan is running at 1000ft. around 0620 I changed the depth to 400ft, above the layer, reduce the speed to 5kts

Active sonar interpret reported contact S21, I am not sure if it is Kuznestosv turned on it’s active sonar or it is from an escort DDG in the formation, Hull sonar picked up S22 at bearing 280s, TA distinguish the sonar profile of Kuznetsov in a cluster of noisy signals (S23). The other one (S16) picked up earlier is Boris Chilikin AOR.




I input an estimated location of S22 , I merged S22, S21 and S23 together , enter the solution then split these three contacts, By using this method, it allows me to input an estimated position while keep the updated bearing of the Active interpret and TA contact, so that I can keep a good situation awareness. However, regarding Kuznetsov’s actual position, I have doubt on my own estimation, it cannot be that close.



Due to the concern of an active sonar detection I decided to dive below the layer. Changed the depth to 555ft at 0636. I lost the Active sonar contact, lost Kuznetsov and Boris Chilikin’s signals on TA. So I guess my pervious estimation of Kuznetsov and Boris Chilikin's location are not correct. Both contacts should be still very far from me (>10nm).


(Solution is incorrect, no way S22 can be that close)




Well, I guess I cannot hide under layer and be a blindman forever. So I decided to change the depth above the layer. The plan is to stay above the layer for a very short period of time, gather whatever information I can get then dive below the layer. I pop up at 0705
Boris Chilikin is close enough to have a strong signal on Sphere sonar (S24), when I dive below the layer, it disappeared, so it is still not close enough to penetrate below the layer . I put two marks on the map, one records the active ping’s bearing (Kuznetsov or DDG), another one is the bearing of hull sonar’s Boris Chilikin contact . then dive below the layer at 0706






An order of change depth above layer issued on 0723. After received one ping, I ordered to dive back below the layer immediately. I put two more marks on the map.




Sonar room report they picked up Boris Chilikin’s signal when we are still under layer. That’s a good news, which means Boris Chilikin get very close to us, we are going to infiltrate the SAG. However, the big question is still there, where is Kuznetsov?



I ordered to get above the layer, get one more ping, made one more mark on the map, then dive back to layer…. With three golden lines , I can run a TMA. I did an estimation on the active sonar source possible location , input Z4 on the map. I kept the current course and speed to close the distance.

(to be continued)
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Old 05-21-21, 02:57 PM   #2
KungPao
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At 0821, the TA picked up Kuznetsov’s contact S23 below the layer. Looks like it is very close to San Juan. I adjusted Z3 to a new estimated location. I noticed that I do not have any active sonar ping contact below the layer. That means the active sonar contact is actually a DDG, and it is still at least >10nm away from me, which is a good news. I can attack Kuznetsov and easily evade the persecution from the DDG.


(After I finished the scenario, I loaded to the save file and turn the truth on. I pinned down Udaloy's position pretty accurately , but there is a significant error on Kuznetsov's position. )




Now Sphere sonar sensor pick up Kuznetsov again. With the latest Sphere, Hull and TA update I am able to pin down a more accurate location. I adjusted the S22(Kuznetsov hull sonar contact) ’s position in TMA , but kept Z3 on the same position just in case if my S22 solution is not correct ,. My plan is to keep the current course speed for probably ten more min, then I can get into Kuznetsov’s baffle


Kuznetsov’s position should be very very close to me. it’s sonar contact bearing changes rapidly on all my sensors


I have get into a prefect fire position . My plan is to release 3 MK48 in passive mode then increase speed to 12kt, turn southwest and attack the Boris Chilikin when I am on the way to pull out.


(to be continued)
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Old 05-27-21, 10:38 AM   #3
KungPao
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As mentioned above, my plan is to stay under layer, release 3 MK48s in passive mode (Tube 4 is loaded with MOSS). Cut two torp’s wires ASAP so that I can begin reloading process. Keep the last one’s wire intact just in case. Hopefully Kuznetsov’s escort will only be able to detect the incoming torpedoes. As soon as the torp hit the target, San Juan will send a countermeasure above the layer, dive to the max depth, turn to the heading 120, increase the speed to 12~15kts. Hopefully San Juan can catch the Boris Chilikin before the DDG and Helo can pin down my location. After that, find a way to get out of here ASAP.



San Juan launched 3 Torp on 0843, 40s later, Kuznetsov detected the torp. From DEMON room I can see Kuznetsov rapidly changed the speed. First MK48 hit Kuznetsov on 08:44:46, 10 seconds later, the other two MK48 hit Kuznetsov too, sending her to the bottom of ocean.



However, after I launched the countermeasure and changed the heading, TA detected a troubling contact, Shkval! There is a Russian SSN not far away from San Juan.



What is more dreadful than a Shkval, is a Shkval heading towards you (the 80hz is an indication)




(After the scenario ends, I load the save and turn the truth on. Here you can see how desperate the situation is)




I quickly ordered change the heading to 90, retrieve the TA, increase the speed to 25kt. However, it is too late. At 08:46, two Shkval detonated, caused a significant damage to San Juan. All the sensors including active intercept are damaged, and need at least 2 hours repair.



What funny about DW is, you will not get a contact from a damaged sonar active intercept , but you can still hear the “ping ping ping” sound.


(turned the truth on, the torp are far away from San Juan, but during the game, due to the damaged sonar system I have no idea how far the torps are. The ping ping sound made me extremely nervous.)



In the next 30 min, San Juan zig-zag , release the countermeasure occasionally. At 1050, San Juan reduced the speed to 5kt, re-acquired the sound contact of DDG and Boris Chilikin above the layer. Later San Juan went above and below layer several times to make sure not followed by Russian SSN. Since I have sink the primary target Kuznetsov and I am in a relatively safe position, I decided to go to the communication depth and send the report to HQ, call it a day.



END
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Old 06-23-21, 12:36 PM   #4
easy
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Default A fine story...

1)Beautiful story! I really enjoyed it. You have clarified it very much by many screen photos.
2) Can you publish any more of these fine stories?
3) And..., you can explain TMA in the same way in a very simple way, for absolute the beginner????
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Old 09-01-21, 02:55 PM   #5
KungPao
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Quote:
Originally Posted by easy View Post
1)Beautiful story! I really enjoyed it. You have clarified it very much by many screen photos.
2) Can you publish any more of these fine stories?
3) And..., you can explain TMA in the same way in a very simple way, for absolute the beginner????
Thank you Easy

FPSchazly's youtube tutorials could be helpful for the beginner

At the same time , there are several discussion about TMA here.

One of the topic started by me, hopefully these help

https://www.subsim.com/radioroom/sho...d.php?t=249527

https://www.subsim.com/radioroom/sho...d.php?t=244229

https://www.subsim.com/radioroom/sho...d.php?t=244986

https://www.subsim.com/radioroom/sho...d.php?t=240663

https://www.subsim.com/radioroom/sho...d.php?t=244772

Just keep in mind TMA is a description on what happened in the past , and many time this description is based on inaccurate data. You will have to use your experience and judgement to predict the future.
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