SeigSoloyvov wrote:Okay you are reaaaaaaaaaaallllly twisting facts again Russian forum, so I get you to need to lie and have russia be number one and hey whatever helps you sleep at night.
It is true the Akula's are faster.
It's not true they have a greater crush depth because no one really knows how deep Virginia's can go all that is public is it's greater than 250. At max dive depth, Virginia can wait for the Akula to come back up because Virginia can stay active for longer, Akula endurance is around 100 days. Akula cannot defend it's self by launching weapons when it's that low, it's a sitting duck at that point. They also cannot travel their fully speed when at their max crush depth doesn't matter if the Akula can out run a Virginia it ain't out running the torps.
Virginia's are quieter Utilising newly-designed anechoic coatings, isolated structures and a new propulsor design, the Virginia-class submarines boast an acoustic signature lower than the Russian Akula-II class submarine (they have one in service), equivalent to that of the Seawolf-class submarines that they were designed to replace.
In terms of reactors and propulsion, The Akula uses the 190MW pressurised water nuclear reactor, one OK-7 steam turbine creating 43,000 hp and two OK-2 turbogenerators that produce 2,000 kW of power. Two OK-300 retractable electric propulsors for low-speed and quiet maneuvering have also been installed to increase stealthier operation of the submarine, although the top speed using this method of propulsion is capped at 5kt.
for Virginia, they have the S9G nuclear reactor delivering 40,000 shaft horsepower and a Pump Jet System.
Final 45kv40k. A mere 5k difference isn't going to do much.
Virginia's also have better sensors, command systems, electronics.
So please stop lying, I know better you can continue to lie to others if you wish but I am not stupid.
It is interesting.
Akula diameter: 13.6 meter
Seawolf diameter: 12 meter
Virginia diameter: 10 meter
Raw power of Akula reactor is 190MWt , Virginia is 150 MWt.
The reactor data is useless, it is probably rubbish.
Now, the submarine maximum speed is defined by the cross section vs reactor power.
For the Akula to have the same sustained speed like the Virginia it has to have six times more power with the same drag coefficient.
The Akula has better and more streamline shape than the Virginia ( double hull) but the reactor sill has to be five times bigger.
Additional interesting is the lack of pumpjet on Akulas.
The advantage of the pumpet is the low noise at higher speed. But it works only in narrow speed and pressure range.
Means the Akula would not benefit from it, means in turn it has deeper diving deep than the Virgnias, otherwise it can benefit fro m the pumpjet.
Anyway, the above scenario is absolutely out of reality.
The Akula will dive deep, and in the greater deep it can run with less noise, and due to the acoustic behaviour of ocean the Virginia would not be able to hear it theoretically.
Simply can outrun the virginia, with towed sonar it will be able to detect it from great distance, and it can shoot eight torpedoes without any notice from the silence of sofar channel.
The point is if the akula works between 200-600 meters deep then the pump jet has to work between 40 bar difference ,
Down at 600 it would not be useful, because the higher speed means bigger drag outside the optimal range of pumpjet ring.
The pumpjet on virginia showing its restricted deep.
Last edited by Singular_Transform on Fri Oct 26, 2018 12:59 pm; edited 1 time in total