Convoy Attack Technique

[Joefour]

Originally Posted by Paulebaer1979

Yes. But you will need a replikator for torps, harpoons and so on, too. And don´t forget about the crew. You´ll need some woman to replikate the crew

And all those engines and systems are the reason why a LosAngelos sub fresh out the shipyard (refreshment) had no chance against a 30 year old 206a in med sea 2002. We won 20 to 1. The one time they found us, we started to snorkel while the batteries were fully charged. We were able to detect the noise from reactor from greater distances as the LA could detect us - even when both subs cruised with speeds below 10kn.

What I find interesting is the detectable noise you say was coming from the powerplants. Many years ago I worked with my dad at a pump factory in the Los Angeles area. They did some DoD work, the majority of which was submarine main seawater pumps, which I think was for Electric Boat in Connecticut. I have no idea what class subs these pumps were for. I worked there from 1973 to 1978, if that helps. The thing is, the pumps were so quiet that they had to be tested outside at a special testing station away from the machine shop noise. What amazed me was that you could stand next to them and not even know they were running unless you put your hand on them and felt a very smooth vibration.

[Paulebaer1979]

Originally Posted by Joefour

What amazed me was that you could stand next to them and not even know they were running unless you put your hand on them and felt a very smooth vibration.

That´s the fact. The reactor needs active watercooling above a spec. speed/load limit. We were able to detect this cooling pump about distances of 2-3,5 nautical miles. When we drove at the same speed, the LA-class sub wasn´t able to detect us at the same distance.

The 212 are better noise-isolated. All engines witch vibrates or make any noise are build in special location. This room is noise-isolated build and has special basics to the hull.
In facts they can detect a coastal cargoship at range about 80 nautical miles and another 212 sub cruising in normal modus only in range under 100m. Therefore HDW had a slogan: "Nobody finds our subs well."

[Panthera Pardus]

Ahoy,

Interesting tactic in your first Post, joefour. But it sound familiar while I read it, and at the End I know why. Because I am a fan of the movie "Periscope Down" since the first time I saw it. And when I think I have enough experience I truly will try it myself. But it is good to know that you tried it successfully. So, Thank you for posting it, have a nice day and good hunting.

Joy and Happiness
Panthera Pardus

P.S.: Just in case anyone wants to know, the German Title is "Mission Rohr Frei"

[Joefour]

Originally Posted by Panthera Pardus

Ahoy,

Interesting tactic in your first Post, joefour. But it sound familiar while I read it, and at the End I know why. Because I am a fan of the movie "Periscope Down" since the first time I saw it. And when I think I have enough experience I truly will try it myself. But it is good to know that you tried it successfully. So, Thank you for posting it, have a nice day and good hunting.

Joy and Happiness
Panthera Pardus

P.S.: Just in case anyone wants to know, the German Title is "Mission Rohr Frei"

I wonder why they didn't just call it " Seerohr Ab". Gut' Jagd!

[Joefour]

Originally Posted by Paulebaer1979

That´s the fact. The reactor needs active watercooling above a spec. speed/load limit. We were able to detect this cooling pump about distances of 2-3,5 nautical miles. When we drove at the same speed, the LA-class sub wasn´t able to detect us at the same distance.

The 212 are better noise-isolated. All engines witch vibrates or make any noise are build in special location. This room is noise-isolated build and has special basics to the hull.
In facts they can detect a coastal cargoship at range about 80 nautical miles and another 212 sub cruising in normal modus only in range under 100m. Therefore HDW had a slogan: "Nobody finds our subs well."

Amazing! 80 NM.

[Paulebaer1979]

Originally Posted by Joefour

Amazing! 80 NM.

Made in Germany

And i was able to hear both, DEMON and LOFAR with the Flank Array.

DEMON stands for: DeModulationOfNoise and means the noise only from the prop of the target.

LOFAR means the lower frequences of the engines and gearboxes. With this tool you can analyse the number of cylinders of the engine, the number of turns per minute and the ratio of the gearbox. Very interesting stuff.

Originally Posted by Panthera Pardus

P.S.: Just in case anyone wants to know, the German Title is "Mission Rohr Frei"

Funny movie. One of four submarine movies i look regularly.