SUBSIM Radio Room Forums - You've hit bottom. Now what?

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- - You've hit bottom. Now what? (https://www.subsim.com/radioroom/showthread.php?t=211719)

Quote:

Originally Posted by Sailor Steve (Post 2203031)

In 1941 S-38 escaped Japanese destroyers in Lingayen Gulf by lying on the bottom - three separate times. Shielded against the background of the bottom the submarine was undetected at a distance of less than 200 feet.

My own experience: While on maneuvers in 1970 my old WW2 destroyer USS Brinkley Bass (DD-887) twice conducted a practice engagement with an Australian submarine. Though we had been upgraded with the latest equipment for the time, we still lost badly both times.

Unfortunately, the devs didn't care. :)

And AFAIK, there is no mod that provides sensor attenuation for a sub on the bottom. Of course, you can shut off the electric motors, which should reduce your signature in-game. But against ASDIC, no help.

BTW, "You've hit bottom. Now what?" Is there a 12-step program for sibsim addicts?

Quote:

Originally Posted by BigWalleye (Post 2203104)

Of course, you can shut off the electric motors, which should reduce your signature in-game. But against ASDIC, no help.

That´s right.:salute: Active sonar shows an echo. If size and depth is realistic the crew knows where the sub is.

As allied escorts didn´t only use sonars actively, but also as passive hydrophones, what is simulated by the game very well, it is in fact an advantage to lay on the bottom of the sea, because the listening range of the surface units is much wider than their active listening abilities.

There is also a mighty attenuator against being heard: silent running. By ordering this, the range of being recognized by enemy sensors is strongly reduced. If you order silent running and reduce your speed e.g. to less than 150 revolves, you won´t be disvovered at all.

Quote:

Originally Posted by Mittelwaechter (Post 2181958)

Order periscope depth, without starting your engines. Your LI will blow balast and your U-Boot will rise.

Hi Mittelwächter,

really glad to see you around here. I remember our discussion about compressed air in the UBI Forum then. In the meantime I found out interesting news and will publish them soon.

E.g. ordering periscope depth will not lead to compressed air consumption at all, the diving cells are emptied by simulated pumps. Only if you use "E" for blowing out the tanks, CA will be used in a considerable amount. If you blow out the tanks with "Double E", they will be emptied continuously until you reach the surface. But this is a hardly controllable manoeuvre.

Greetings

Dont post much but I am curious about these responses myself since some of my most memorable times in SH3 have come in just this situation. Once I waited them out and the DDs, who didnt seem to be able to detect me, eventually moved away on their own. I repaired, surfaced and breathed again with a bit of a grin on my face. But this happened to me the other day and the DDs continued to DC me until I was finished...and it didnt take long either. Course, I was an idiot trying to sneak through the channel anyway. Depth may have a large impact on this. Went down in about 45-50 meters of water...first time was well over a hundred and close to the boats limit if I remember correctly.