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Opening bow caps and flooding tubes manually

 
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Greenhornet



Joined: 30 Apr 2002
Posts: 81
Location: Canada

PostPosted: Sun Feb 15, 2004 4:28 am    Post subject: Opening bow caps and flooding tubes manually Reply with quote

It would be great to "maually" load torps, flood tubes and open bow caps as sub command has. I looked at the screen shots of the game and they look great. I don't think you need to see the crew though, if they just sit there frozen it kinda kills the point of the crew and if they move around it might take resourses of something better like a way better sound system with screw sounds that you can tell apart from one another.

Also, in the control room you could have the board that says everything is ready for a dive and is in the green or "KLAR" making sure that all compartments are not open to the sea, like the engines, hatches etc.

stuff like this really makes it immersive and when you spend hours under the waves you got a few things to do instead of stareing at depth gages for hours.

Another cool idea would be when you bottom the sub you cannot locate it and the DC's don't blast you with one can.

I know this post is almost a waste 'cause I won't happen, but I just had to say what I figured would be easy additions to the game.

Also Movie sound and music, al la das boot really makes a difference!! Yep
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finchOU



Joined: 27 Jan 2004
Posts: 486

PostPosted: Sun Feb 15, 2004 3:48 pm    Post subject: Reply with quote

I think the Tech. is there for sure........its whether the company is going to spend the extra money for the immersion effect........I'm just waiting to see if their is a truely new game or just a SHII++.....it will be interesting to see what they come up with......good or bad.........I prey it will be the best to date over all previous U-boat sims. That is the best we can hope for
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Der Teddy Bar



Joined: 10 Jan 2002
Posts: 1360

PostPosted: Mon Feb 16, 2004 5:15 am    Post subject: Re: Opening bow caps and flooding tubes manually Reply with quote

Greenhornet wrote:
Another cool idea would be when you bottom the sub you cannot locate it and the DC's don't blast you with one can.

I am sorry to inform you that this is primarily a movie myth.
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Sailor Steve



Joined: 22 Nov 2002
Posts: 5433
Location: Salt Lake City, Utah

PostPosted: Mon Feb 16, 2004 11:04 am    Post subject: Re: Opening bow caps and flooding tubes manually Reply with quote

Der Teddy Bar wrote:
Greenhornet wrote:
Another cool idea would be when you bottom the sub you cannot locate it and the DC's don't blast you with one can.

I am sorry to inform you that this is primarily a movie myth.


Maybe, maybe; on the other hand the sand on the bottom does absorb a lot of the energy, and at least one US sub reported surviving an 18-hour frenzy in fairly shallow water. Also, given the number of whales and schools of fish that were attacked during the war, I'm not sure that becoming part of the clutter on the bottom doesn't help. It certainly fools the passive sonar.
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Etienne



Joined: 10 Jan 2002
Posts: 641
Location: Canada

PostPosted: Mon Feb 16, 2004 2:37 pm    Post subject: Reply with quote

Active. Passive can still hear you just as welll, althought being on the bottom should allow you to shut down the engines.

Now, wether bottoming out is a good idea... Well, I'll leave that to you to decide.

(Hey, Captain! We're taking on water, the rudder's ripped off, the screws sound funny, and, um, didn't we have dive planes when we left port?)
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AS



Joined: 23 Jan 2004
Posts: 573
Location: Germany

PostPosted: Mon Feb 16, 2004 4:03 pm    Post subject: Reply with quote

It was quite common to ground the boat when waiting for something, e.g. for meeting a freindly escort bringing you home to port (which was usually the way they did it due to the mine-danger) or just having a safe rest. Prien reportedly lay on ground before night fell and he went into Scapa Flow. So, it should be an option and it should be taken into account that a U-Boat wouldnīt been detected there "just so" by ships just passing by. Itīs a different matter, though, when you are searched for actively and the enemy knows that you are there. But if he doesnīt, he wouldnīt notice you.

Cheers, AS
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Sailor Steve



Joined: 22 Nov 2002
Posts: 5433
Location: Salt Lake City, Utah

PostPosted: Tue Feb 17, 2004 12:52 am    Post subject: Reply with quote

Etienne wrote:
Active. Passive can still hear you just as welll, althought being on the bottom should allow you to shut down the engines.


Sitting on the bottom means that your engines are off, thus fooling the passive sonar. Active may or may not be able to distinguish you from the rest of the garbage on the bottom.
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Der Teddy Bar



Joined: 10 Jan 2002
Posts: 1360

PostPosted: Tue Feb 17, 2004 6:32 am    Post subject: Reply with quote

To all!

Yes it is possible to hide on the bottom of the ocean when being hunted by an escort though this would be the exception and would only be done as a last resort. It also can only be successful in ideal locations. That is to say, just sitting on the bottom of the ocean will not allow you to hide from an escort using passive or active sonar.

In the example of Prien, an escort can detect you using passive sonar when you are not moving. It can do so as all the auxiliary machinery must still run, such as bilge pumps, air scrubbers, compressors and the likes. Of course if you are hiding from a known escort you would turn these off for as long as you could.

A ships active sonar can detect a u-boat/submarine on the ocean floor as practically as an airplane can detect a u-boat/submarine on the surface with radar at night.

So how is it possible to hide on the bottom of the ocean? With a great deal of circumstantial luck. It is not a valid tactic and has its own negatives.

The circumstances; In shallow waters of varying depths i.e. high sand banks, or in an area with many wrecks, or in narrow bays multiple echoes may occur which make it difficult for the escort to locate you. I would expect that these alone without the assistance of water effects such as stratification, the salt content and good luck would not suffice. I also feel that the possibility of successfully hiding on the bottom would greatly diminish in the case of an experienced allied sonar man as compared to the Japanes counterpart.

There are negatives, such as your location being divulged by seeping/leaking oil. A hairline fracture can be enough to enable an oil slick to advertise your current location. There is also the issue that you cannot keep the smallest profile to the escort, not can you escape the area.

There will always be exceptions to the rule; times where something as dangerous as sitting on the bottom as an escort hunts you, will against the odds win you the day.

Note - Stratification can occur after long spells of sunshine on calm water; where two or more different water conditions merge.
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AS



Joined: 23 Jan 2004
Posts: 573
Location: Germany

PostPosted: Tue Feb 17, 2004 7:11 pm    Post subject: Reply with quote

Sorry, I donīt agree. I donīt like this English phrase "active/passive sonar" in the first place, as it only accounts for TODAY`S warfare. In WWII there was no "sonar" at all. There were either ASDIC, which reportedly wasnīt as fool proof as the Royal Navy had thought, or very simple "listening devices". Both didnīt work as good as SH2 makes us believe. The U-Boat success in early war was unbelievably great because the Royal Navy was not so good at detecting U-Boats.

Apart from technical devices, detecting a U-Boat is also a matter of AWARENESS. A destroyer not expecting a U-Boat would NEVER, again: NEVER detect one ACCIDENTLY (unless itīs running at flank speed at 30 meters while the crew is singing the Tipparary song).

So what Iīm getting at is: donīt make the destroyers over-aware and over-accurate. They werenīt historically. Read about actual U-Boat attacks (normally SURFACED, at night, within 600 meters or so next to cargo ships) and you will easily see that detecting a U-Boat - no matter whether surfaced or submerged- wasnīt an easy task.

Cheers, AS
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Der Teddy Bar



Joined: 10 Jan 2002
Posts: 1360

PostPosted: Wed Feb 18, 2004 7:21 am    Post subject: Reply with quote

AS wrote:
Sorry, I donīt agree. I donīt like this English phrase "active/passive sonar" in the first place, as it only accounts for TODAY`S warfare. In WWII there was no "sonar" at all. There were either ASDIC, which reportedly wasnīt as fool proof as the Royal Navy had thought, or very simple "listening devices". Both didnīt work as good as SH2 makes us believe. The U-Boat success in early war was unbelievably great because the Royal Navy was not so good at detecting U-Boats.

Apart from technical devices, detecting a U-Boat is also a matter of AWARENESS. A destroyer not expecting a U-Boat would NEVER, again: NEVER detect one ACCIDENTLY (unless itīs running at flank speed at 30 meters while the crew is singing the Tipparary song).

So what Iīm getting at is: donīt make the destroyers over-aware and over-accurate. They werenīt historically. Read about actual U-Boat attacks (normally SURFACED, at night, within 600 meters or so next to cargo ships) and you will easily see that detecting a U-Boat - no matter whether surfaced or submerged- wasnīt an easy task.

Cheers, AS

AS,
Sonar (an acronym for Sound, Navigation and Ranging) is a system for underwater detection and location of objects by acoustical echo. The first Sonars, invented during World War I by British, American and French scientists, were used to located submarines and icebergs and were called ASDICS (for Anti-Submarine Detection Investigation Committee) in Britain. These were passive listening devices. Sonar is an American term dating from World War II.

So to recap for you, if it is a British escort you are being hunted with ADSIC, if it is an American escort you are being hunted with Sonar.

In 1939, Great Britain had 165 destroyers and 54 patrol ships and minesweepers equipped with the active sonar. Before WW2, the United States had 60 destroyers equipped with the active sonar. Germany had many ships and submarines equipped with the sonar. In the German navy, the sonar was known as “S-unit”.

I will hunt down the particular report at http://www.uboatarchive.net/ of a u-boat travelling at standard submerged speed at a depth of 50+ metres in the middle of the ocean who was detected by an American (?) escort at a distance of 3000 to 4000 metres. No they were not singing "the Tipparary song" nor doing anything excessive.

And yet I do know of a U-boat in the Gibralta region whom survived 600+ depths charges by many escorts over many hours, this was in 1945.

Yes SH2 was in my opionion a halve baked game, not worth the several hours that I did try and make it work for me.

With regard to why the u-boats were able to escape, yes the limited sonar was partly responsable. Though it did work and it did detect u-boats. There were many other factors that were just as important. One was the maximum depth and sink rate of the early ware depth charges coupled with the lack of knowledge on exactly how deep a u-boat could go. The depth charge and the knowledge were a good 50 metres short.

Sory I have time only for this short reply, but time is against me at the moment.
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NeonSamurai



Joined: 10 Jan 2002
Posts: 504

PostPosted: Wed Feb 18, 2004 10:59 am    Post subject: Reply with quote

Quote:
I will hunt down the particular report at http://www.uboatarchive.net/ of a u-boat travelling at standard submerged speed at a depth of 50+ metres in the middle of the ocean who was detected by an American (?) escort at a distance of 3000 to 4000 metres. No they were not singing "the Tipparary song" nor doing anything excessive.


That was certainly dumb luck probably combined with ideal sound conditions for detection as that almost never happened, and the escort probably picked the sub up on hydrophones while drifting or crusing at around 3-5 knots. Most of the time the escorts would need to spot the sub visualy first to have much chance of chasing down the sub successfuly or know one was in a certain area (generaly after the torpedoes go boom)


Active sonar (asdic and active sonar are basicly the same thing) at the time was not very effective and its range was pretty lousy most of the time to acuractly detect an evading sub. It also had a bad habbit of picking up clutter from the ocean bottom like large rocks or wrecks (many many wrecks were mistaken for submarines and repeatedly depthcharged during the war) plus it was not able to acuratly indicate where the sub was, or distance, let alone what depth. Water conditions played havoc with it. Passive sonar (hydrophones) on the other hand could be very effective but only if the ship was drifting or moving very slowly and internal sounds were kept at a minimum. Over 10 knots the hydrophones would be useless due to engine and ship noises, and the sound of the water traveling over the hydrophones. Also sub hydrophones could detect much better and at further ranges, due that it was mounted on the top of the hull which prevented most of the ship sounds from interfearing, and the ability to change the depth of the hydrophone by changing the sub's depth. Plus less problems with surface noises.
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Der Teddy Bar



Joined: 10 Jan 2002
Posts: 1360

PostPosted: Wed Feb 18, 2004 6:01 pm    Post subject: Reply with quote

NeonSamurai,
Yes the limited range and the narrow area of the 'search light' active sonar was a considerable handicap. However, even the first active sonar could tell what direction the u-boat was.

However, the later implementation of the Q and Type 147 as shown in this picture did allow the escorts by 1942 (?) to be able to tell the depth and direction in which the u-boat travelled.

Of course it was not all seeing and all conquering as I have said time and time again in the SHII forums.

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AS



Joined: 23 Jan 2004
Posts: 573
Location: Germany

PostPosted: Thu Feb 19, 2004 2:02 pm    Post subject: Reply with quote

... interesting discussion going on here

...we shouldnīt also forget that a destroyer had to run very slowly to use itīs sonar/ASDIC whatever equipment effectively. So itīs not likely that a destroyer at normal cruise speed would detect my HIFI playing Metallicaīs new album at top volume (yes I DO love exaggerations...)

Ironically, DDs had to slow down to LISTEN/DETECT, but they had to speed up (approx. 12 knots+) to be able to throw depth charges without damaging themselves. While axccelerating they lost contact (if they had any in the first place) and went blind (or deaf, rather) for some crucial moments. Moments a godd Kaleun would know how to make use of...

Cheers, AS
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NeonSamurai



Joined: 10 Jan 2002
Posts: 504

PostPosted: Fri Feb 20, 2004 12:42 am    Post subject: Reply with quote

Not very acurately, it would give an aproximate bering, and even depth, but the bering could be easily off due to the outgoing/returning wave getting bent by differences in the water between the sub and at what angle the sound wave hit the sub, also sound curves as it goes deeper into the water and will even bounce/disipate if it hits a thermal layer. At best it would give you a rough bearing and very very rough depth. Direction takes multiple acurate pings, Even modern active sonar supposedly cant acurately tell the depth of a sub, takes multiple pings for course, and needs to be plotted out on the computer to get the course easily. So i doubt that a ww2 escort would have the time to plot out the course the sub is heading while charging in on a depthcharge run. I also would bet that the ranges listed on that chart are for ideal conditions. If it was that effective there would have been alot more dead u boats during the war from ship droped depth charges.

As an example the us subs pre ww2 were taught never to use their periscopes when attacking but to use active sonar to get the shooting information. When ww2 came around they quickly discovered that what they were told to do didnt work, the torps would miss flat out almost all the time, not to mention give a good indication to the enemy that a sub was out there and where it was. Given that the technology for analizing the sonar returns didnt change much thru out the war, i doubt the acuracy improved Of course i need not say for you vet subsimers that active sonar can be heard 2-3 times as far as you can detect with it. Smile

Oh and active sonar you can use when running full speed from what i know, though it will cut back alot on the range you can detect stuff . Reason being that the sound return can be strong enough to pick up over everything else (sonar sound pulses are very powerfull and loud Smile ). They lost contact as the sub went behind/out of the active sonar arcs. and then from the depth charge blasts which would fill the water with several million small bubbles for 30 seconds or so (those bubble clouds block active sonar, and make way too much noise for hydrophones to hear through.).
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