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-   -   Evading deep? (https://www.subsim.com/radioroom/showthread.php?t=128440)

MarkShot 01-06-08 10:36 PM

Evading deep?
 
I've been practicing some GWX convoy attacks using the single missions.

I know that anything about 1kts silent draws a lot of attention. So, it seems to me that I have two choices after shooting. Stay slow, silent, and shallow if I don't think anyone knows where I am. Or if I think that have my location, then make a noisy, crash dive, and go deep.

Given how long it takes to go deep when running slow and silent that would seem pointless, correct?

Is that pretty much it?

deepboat 01-06-08 10:43 PM

If I'm a long time between reloads and I sense trouble, I go to flank speed send out some decoys if available and then make a hard turn stb or port, reduce my speed to slow or silent run and continue descent.

UnterseeBoogeyMan 01-06-08 10:44 PM

if you are at 1-2 knots and can still hear you, try going to silent running. if you hear them come close, within short range and they are pinging, I would put as many crewman as I could in the bow, crank the engine full out, dive to 150 meters. at 100 meters depth I cut back to slow, silent running, and gradually make 10 degree turns in either direction. eventually they will lose you. If you are successfull at evading the DDs after their depth charge attack, you will be in the clear 30 minutes later becuase they will race away to catch up with the convoy.

I always run to te depths if they ping. the whole reason they ping is to get a bearing ,depth and range on you. they dont need to hear you to do that. if you go past 100 meters, their pings are not very effective.

I will be honest, my careers so far, have not gone past 1940, so mayb the tech of active sonar improves. but those are my observations on early war detection.

The Butcher 01-06-08 10:45 PM

Big loud exploding sounds
 
You are going to get swarmed as soon as the torpedos start exploding. Get deep while you can, I go flank speed, and if I can get below 100 meters I go. If you can't get deep then as long of of shot you can make and try to slip away silent. Good luck.

rizZO_77 01-07-08 12:34 PM

I always go deep and silent after i have shot all my tubes. Reload and have another go if not detected. Otherwise i will try to creep away with silent running and try to overtake the convoy again from a safe distance.

Brag 01-07-08 01:37 PM

Read the articles on convoy attack and evasion in my webbie. The methods work in SHIIIstock, GWX1.03 and GWX 2.O :D

Jonathan 01-07-08 01:45 PM

I love all this information...I am smackl dabin the middle of trying to vade depth charges right now...

Canovaro 01-07-08 03:26 PM

I go silent and deep, but ut takes a lot of time to reach 150m.
When they found me with asdic (about 20% of the time), I go full speed, and turning then try to go silent again and see if they lost me.


When diving at high speed, be very careful not to cross the depth line where you can't get your boat to rise anymore at slow speed!! You will sink deeper and deeper unless you increase speed, alerting the enemy.
This depth line depend on the boat you are using.

Cohaagen 01-07-08 10:36 PM

I rarely offer advice to anyone on any subject, but here is this...

If the sea is rough (10mps+) - try staying at periscope depth/silent run. Their active/passive ASDIC readings will be seriously affected.

Sailor Steve 01-08-08 12:12 PM

Cohaagen, that's great advice!:up:

I usually just crash dive to 70m, as that leaves me room to go deeper, as well as speeding up and turning right before they drop. Changing three dimensions is better than two.

3Jane 01-08-08 12:16 PM

1/3 ahead until the first torpedo impact then to 2kts.

Commander Gizmo 01-08-08 08:08 PM

I wonder if anyone else has tried this. If I have only one DD on my tail and an aft torpedo left, I will sometimes stay silent and turn rudder 30+ degrees in the direction the DD is circling. I find that they have a very hard time getting on top of me if I stay with them and then change to 30+ degrees the oposite when they start a run. Usually within 30 minutes I've got the aft torpedo under them and I've got the convoy all to myself.

Philipp_Thomsen 01-08-08 08:26 PM

A lot of people think that the speed you're travelling underwater is the key to be stealthy... thats not quite right.

Doesnt matter how fast you're going, what matter is how fast your screws spinning. If you stay lower then 100 rpm, then you'll be undetected by hydrophone, they can only find you by pinging you (considering you're not reloading torpedos and/or fixing damaged systems).

I go around 3 or 4 kts, but keep my screws at 150 rpm maximum. They can't hear me. And if they find you, dont rush to the bottom using fast screws... that only gives them more and more clues about your position. Stay as quiet as you can and go deep, as deep as you can. I usually try to kiss the bottom of the sea, around 200-250 meters, leaving 5-10 meters below keel, so the DC that blow in the bottom dont damage my boat. The deeper you go, the harder for them to determine your position and the easier for you to evade DC, coz you have plenty of time to change your XYZ position.

I use to stay at periscope depth until the absolute breaking point, scoring the maximum tonnage i can, reloading torpedos as fast i can and releasing them. When its about dive or die, them i go totally silent and the deeper i can. If you can use the hydrophones well to determine where are they coming from and you're very deep, the chance of being depth charged are reduced to a very safe level, so i dont waste any oportunity to score more hits.

But be aware! If you're hunting in shallow waters (50m or less), forget about reloading the torpedos. Stay as quiet as you can, attack from a greater distance (2 or 3km) and get out of there before they find you. In shallow waters, any tonnage is already a big prize. In deep waters, take the risk, it's worth!

MarkShot 01-08-08 09:27 PM

I know to manually set speed by the knot, but how do set your RPM?

Also, how can you set low RPM, but 4kts travel? Without a variable pitch prop how can the two be independent variables?

Thanks.

Philipp_Thomsen 01-08-08 11:02 PM

Quote:

Originally Posted by MarkShot
I know to manually set speed by the knot, but how do set your RPM?

Also, how can you set low RPM, but 4kts travel? Without a variable pitch prop how can the two be independent variables?

Thanks.


They are not independent and you cant set the rpm manually... but setting the speed makes changes on the rpm dial... so you set your speed as much as you can while inside the maximum stealth rpm. You can see this dial better in the periscope tower (between the command room and the conning tower).


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