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The 900m limit on the Alfa is varied many sources say 700m some say 900m some say 800m what is know is that they have been tracked and recorded at speeds of 42 knots by not only by the USN but also the RN and French navies, it was also confirmed by SOSUS in the 70's, as for thier loudness alot of western submariners and SOSUS operators will tell you they were very loud and it is a known fact revealed by Dr John Craven that an alfa coming off the North Cape at high speed was picked up at a SOSUS listening station in Bermuda. The point with the Papa was to re enforce the notion that they have built multiple classes of titanium hulled submarines. The Sierra class is very well known and documented to have the ability to dive to around 850 meters a lot of the depths were worked out by calculation (in the Project 705 case) but others like the Sierra the west have recorded their diving capabilities, the Sierra information that is current lists this not just in western sources but also Russian sources the Sierra is extremely well built. |
The Bandit - you not true. In this year (2017) first commander first submarine project 671RT (Victor II NATO) say, that him submarine have range detection in US Ohio submarine more then 100 cables (more than 10 miles). And US submarine use masking device like surface cargo ship in this range.
But really situation is secret and I himself know what write submarine commanders in Internet. |
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http://www.aticourses.com/blog/index...-shark-at-sea/ In all this discussion of American vs Russian submarines, it seems like the Russian submarines were much more of science projects. As in, the Americans found a design they liked and kept making subs like that while the Russians kept experimenting. Whether this is because they couldn't make up their minds on a sub design or wanted to keep improving/exploring is something I can't comment on. |
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USS Greyling collided with the Delta IV class submarine K407 under the command of Captain 1st Rank Sergey Bulgarkov USS Tautog Collided with the Echo II class submarine K108 in the 1970's the K108 under the command of Captain Boris Bogdasaryan spoke of the incident in the 90's and it featured in Blind mans Bluff, the Tautog sail was left with a permanent 2 degree angle. The Alfa sail design was a mistake the designer didn't mean to blend it as such but it worked very well, what is more these submarines were highly automated as a lot are in the Russian fleet, the Akula only has around 50-60 crew where as the 688 has between 115-130 |
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I am aware of the HY ratings i did read the Virginia is built along similar lines to the Astute in terms of steel used and pre fabrication methods following on from the Seawolf. I gathered from many sources that the reason for seawolfs expense wasn't all down to the kit inside it was the hull and many sources pointed to HY130 being used but HY100 is still expensive, as for the Virginias using HY120 this could mean a deeper diving submarine? |
Kapitan - US Virginia have HY-80 steel:
"Depth: 800+ feet (operational) approx. 1200 feet (safe depth) approx. 1800 feet (crash depth)" |
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HY-80 has not been used in a long time.. 774 class does not use HY-80. |
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For a crude example, if the Virginia hull thickness is the same as the LA, that would mean a greater diving depth. If they wanted the same diving depth as HY80 on the LA, however, they could use a thinner wall made of HY120. However, the Virginia weighs a lot more so I'm not sure about the thinner part. It's probably a combination of slightly thinner but still a somewhat greater diving depth. |
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As for the HY ratings i understand the pressure ratings but in terms of thickness relation to strength thats where i get lost, given the state of technology today i would assume that HY 120 steel is some what cheaper today than back in the 70's and 80's when the 688's were coming online, i do know the hull cost for seawolf was extremely expensive again that was a cost forecast taken from 1997 so again thats taken from the time. |
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