How the hell did this happen??

[CaptainNemo12]

I was approaching the DD head on at a distance of about 8000-9000m, by the time the DD was within 1000-1500m of me I was about 20 degrees off the DD's starboard bow, at 40m, engines stopped. What I don't understand is that I did not hear any "pinging" sound coming at me until after the DD somehow found me underwater. Do the DDs use some sort of inaudible sonar to detect objects underwater and switch to ASDIC when they detect such an object?

Shot in the dark.
Could SH3 be using ASPECT for hydrophone contacts, instead of SOUND???

[pickinthebanjo]

Now I'm confused. I've hit at least 4 convoys on my career, this is my second career by the way. And in each of those attacks I've cut the convoy off and got in it's path way outside visual range. Then I cut engines and wait. When the convoy is passing over me the I attack.

But it seems that most people are detected when they should not be, hmm.
I don't understand why I don't have this problem, Your all using GWX3 and commander?

[CaptainNemo12]

Originally Posted by pickinthebanjo

Your all using GWX3 and commander?

I am!

[pickinthebanjo]

Originally Posted by CaptainNemo12

I am!

Well this is totaly off topic but if you want convoy like tonnage, attack Scapa Flow. I'm going to be posting a totorial on the best way to do so as soon as I finish the attack I'm about to commence right now. (need Some Pics First)

I attack that harbor every 6-12 months

Originally Posted by pickinthebanjo

Now I'm confused. I've hit at least 4 convoys on my career, this is my second career by the way. And in each of those attacks I've cut the convoy off and got in it's path way outside visual range. Then I cut engines and wait. When the convoy is passing over me the I attack.

But it seems that most people are detected when they should not be, hmm.
I don't understand why I don't have this problem, Your all using GWX3 and commander?

I don't have this problem. Just trying to figure out a reason, for those that do.
(And I never cut my engines off. Always 90 RPM.)

[pickinthebanjo]

Originally Posted by Snestorm

I don't have this problem. Just trying to figure out a reason, for those that do.
(And I never cut my engines off. Always 90 RPM.)

They Don't Hear You? Ill Have To Incorperate That into my attacks, It's so hard to try and line up just right outside visual range in front of the convoy with no engines.

[unterseemann]

Hello, first i think there is no point in diving to 40m ( look at GWX manual B15 and B16 appendix), keep periscop depth and don't show your periscop. You don't have to wait at 0kn you can keep a speed of 1-2 knots while approaching the convoy, so you can move out of the escorts path
Also another thing, i may be wrong but... it seems that external camera attracts escorts' attention so stay in your boat, rely on hydrophon and check with your periscop when visual contact is possible to adjust course
Hope it will help you!

[Mittelwaechter]

Why do we expect the DDs to use only passive hydrophone while running a search pattern?

Me as a DD captain I would have ordered to run an active ASDIC search just right into the blue from time to time.

I think it is quite realistic to be pinged occasionally sitting close to a DD on duty. Keep your aspect low and hope you'll make it into the convoy.

In later war I stay outside the convoy and make full use of my pattern running torpedo stand off capabilities.

[bigboywooly]

For some reason at PD you are less likely to be picked up than at 40m
Have no idea why
If seas are rough I will go to 20m and seems ok

[sergei]

Originally Posted by bigboywooly

For some reason at PD you are less likely to be picked up than at 40m

Surface clutter?
I'd be surprised if the game actually modeled this though.

[codmander]

u-r- unlucky

[bigboywooly]

Originally Posted by sergei

Surface clutter?
I'd be surprised if the game actually modeled this though.

No I doubt the game models that
May have something to do with the asdics forward view which IIRC is like a cone that projects ahead of the unit but starts at a certain depth so PD usually gets missed
Still shouldnt be picked up at 40m silent running though in reality unless just unlucky

[Hitman]

Why do we expect the DDs to use only passive hydrophone while running a search pattern?

Me as a DD captain I would have ordered to run an active ASDIC search just right into the blue from time to time.

Because a sonar ping can be heard from huge distances, and convoy smoke not so much. Pinging constantly is essentially like yelling out who and where you are

In real life convoy escorts would only ping when believing or knowing that a Uboat was nearby.

No I doubt the game models that
May have something to do with the asdics forward view which IIRC is like a cone that projects ahead of the unit but starts at a certain depth so PD usually gets missed
Still shouldnt be picked up at 40m silent running though in reality unless just unlucky

Yes in real life the ASDIC beam starts from the lower part of the Escort bow and then goes slightly downward, to ensure the impulse does not hit the surface (Which causes it to rebounce and produce false echoes and cluttering noise). In SH3, since the node is also in the lower part of the hull, it won't detect things that are higher than that unless the geometry is tweaked to allow it -which I don't think it is, and would be irrealistic in any case-. An Uboat can, and shall be detected at peri depth by ASDIC as long as it is deeper than the sonar dome in the escort and close enough. Otherwise, the beam goes downwards and can't reach her to get a meaningful echo.

In any case, I also have suffered the easy detection many times, and I'm pretty sure it was passive hydrophone what got me. May be ocasionally on day time the periscope, but mostly the passive sonar. Though I must say that I never cut engines completely as it is irrealistic -U-boats in reality were never perfectly trimmed and needed 2 knots at least to keep constant depth.