Author Topic: New russian subs  (Read 3546 times)

Offline kappa

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Re: New russian subs
« Reply #90 on: January 24, 2014, 07:32:04 AM »
Nice! What boat is that?

Not a boat my friend.. that is a commercial power plant licensed to over 3450MWt.. One of the larger boiling reactors in the country..
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Offline GScholz

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Re: New russian subs
« Reply #91 on: January 24, 2014, 02:01:46 PM »
Ah... Looked very "naval" and seemingly cramped, but the scale is difficult to judge from a photo.  :)
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Offline Rich46yo

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Re: New russian subs
« Reply #92 on: January 24, 2014, 02:44:31 PM »

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The SSK/AIP subs can sustain 20 knts on AIP power for at least 24 hours, it's probably a bit more, but classified, but I've seen it written several places and on several graphs in various papers that there is enough fuel in all the various AIP systems on the varying subs to give them around 1000km range at max power before running the fuel cell out.  5 knts is the sustained cruise speed on the AIP for 3 or 4 weeks without having to snort.  I wasn't talking about AIP, AGAIN, when the SSK's are transiting to the operational area.  The crossings are done on D/E power, and, like I've said to you twice now, at speeds between 10 to 15 kts.  Even in the second world war the US and German fleet subs transited to operational areas in the double digits speed wise.  Are you saying with your "humble" request for references that modern subs aren't going that speed?

Of course they can but they arent doing it on AIP drive strictly. They are using their batteries too which forces them to recharge. Thats all I was saying, that AIP alone wont allow them such transit speeds/times.

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THat is one of three places I've read that AIP powered subs burn off most of their AIP fuel source in approximately 24 hours at 20knts or greater.  Pretty simple math to get 1000km range, 20 kts x 24 hrs = about 1000km or more.  Regarding crossings or long distance sorties, I'm not sure why or what you're asking for.  How is it you think I've hoodwinked you somehow by saying modern D/E/AIP SSK subs do?  A relative of mine who was on the Canadian Oberon classes and then the Victoria class for a short while before retiring said they carried more than enough diesel in their tanks to bring the subs home from the UK when they bought them at speeds of 12 knts or better, and they aren't AIP equipped, just D/E.

Again you seem confused about "abilities" and "realistic combat requirements". No skipper is going to run down his AIP like that, regardless of whether they are capable of this or not. 1000 km in the open ocean is nothing. Not when your chasing a combat group that can do 30 knts+ for about 3 times around the world.

And thats the point. Whatever their capabilities are they are far outclassed in the blue water by a modern nuclear navy. Their place is in the littorals and the shallows, no serious submariner disputes that. And in that theater the modern SSP is a very dangerous opponent. This is where a top Naval force can really get hurt by a 3rd world navy operating modern SSPs. Ive already said the US made a mistake not developing our own, most of all with the robust export market for them.

I really see nothing in your links saying the 24 hour at 20 knts with AIP only. Please quote the exact paragraph WITH the link.
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Offline GScholz

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Re: New russian subs
« Reply #93 on: January 24, 2014, 02:58:38 PM »
Of course they can but they arent doing it on AIP drive strictly. They are using their batteries too which forces them to recharge.

If you mean they have to use their diesels to recharge that's not entirely accurate. Both the Swedes with their Stirling engine and the Germans with their hydrogen fuel cells can recharge the batteries using the AIP system (at a reduced speed of course). They don't have to snorkel after having dashed at high speed for a while using the batteries. However, it will of course reduce their total AIP range.
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Offline GScholz

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Re: New russian subs
« Reply #94 on: January 24, 2014, 04:04:00 PM »
The Siemens AIP system on the 212/214 is a 240 kilowatt plant. The Siemens Permasyn electric motor requires 2.85 megawatts to operate at max power. The diesels provide 3.96 megawatts for propulsion and recharging. The AIP system provides less than 10% of the energy required to run at flank speed. The rest will have to come from the batteries. A sub nuke plant is typically 20+ megawatts. Top speed on AIP alone is 6 knots. Range on AIP alone: 1,248 nm at 4 knots. Range at 8 knots (using AIP+batteries): 420 nm. Endurance at 20 kts is only a couple of hours or approximately 50 nm. Mission endurance: 12 weeks. Submerged without snorkelling: 3 weeks. Max range total: 8,000 nm (12,000 nm for the 214).
« Last Edit: January 24, 2014, 04:06:34 PM by GScholz »
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Offline Brooke

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Re: New russian subs
« Reply #95 on: January 24, 2014, 04:31:01 PM »
Cerenkov radiation is very pretty.  When I was in nuclear engineering at the University of Michigan, we had an open-pool reactor, so you saw lots of Cerenkov radiation.  Alas, it has since been dismantled.



I had a nuclear-engineering classmate in NROTC who was on a nuclear attack sub for a summer in the 1980's and had some interesting stories.

Offline Gman

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Re: New russian subs
« Reply #96 on: January 24, 2014, 06:00:59 PM »
No, you're the one who is confused.  I never once said that it is something an AIP SSK would do, just that it is a capability that the system has, regarding running the AIP at full power.   I realize that there isn't a situation where running your AIP fuel cell dry for no reason isn't something that a sub would do during normal operations, it's just that is simply what the system is capable of.  

You asked me to provide reference to SSK AIP subs crossing in transit the ocean at the speeds I claimed, on regular D/E propulsion, which I clearly did.  Nothing you're saying now is something I ever contradicted, so stop dancing please, thanks.  Nor did I every say a sub would run it's AIP out by running at max power, just that it is possible for them to run 20 kts on AIP and go at least 1000km, it's right there in the first report, as well as the 2nd one in the graphs as well.  If you can't bother to read it, it's right under the paragraph regarding Australia's requirements, where it states that an AIP SSK on the offense going after an enemy target will run its AIP fuel out within 24 hours at max~20kts speed, which is why a nuclear SSN is a better hunter killer for them.  Look at the graphs, it's right in front of your nose as well regarding max power and speed on the AIP system, not to mention spelled out in words in the first report if you can't figure the graphs out in the second.


SSK AIP subs transit at speeds varying from 8 to 15 kts, usually in the 12 to 14 range, then cruise at 5 kts in the operational area on their AIP system for up to a month.  They also have the capability to use max AIP power and stay very covert in order to evade threats or make tactical movements as the situation requires, and do so for up to 24hrs or more on their AIP tied in systems until the fuel cell is expended.  That's the end of story.  I provided the material which directly discusses modern SSK transit times, and it shows every single modern SSK sub.  I never once said that they crossed in transit using the AIP system, that's something you're creating, again not something I ever claimed.  All I said was that the modern SSK AIP's are no longer tied to coastlines and operational areas near home, since they can use their bunker fuel for transit at high speed to the operational area, then slow cruise at 5 kts in near silent mode on the AIP system for a month once they get there, and use high speeds of 20kts for approx 24hrs of use on the AIP system without the diesel running at all, when required for tactical reasons in the operational area.  That's it, plain and simple.  All this other noise you're making is just to cloud the fact that you don't like being shown the precise information you asked for.

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The AIP system provides less than 10% of the energy required to run at flank speed. The rest will have to come from the batteries.

This is correct, and if you look at the graphs in the 2nd and 3rd links, the AIP system is tied in with the batteries, the batteries are air independent as well until they are discharged, which gives max flank speeds of greater than 20kts, the real max is likely a little higher than this, but certainly not near SSN speeds.  Again, as I've stated enough times now, at 20 kts or whatever flanks speed is in each SSKAIP sub, the fuel cell can only sustain that for around 24 hours, roughly 1000km or just over, and then it's expended, and the snorts have to start and continue for the remainder of operations.  The European built AIP SSK's are truly something now, very, very dangerous units that are cheap enough for non-USA countries to operate.  I'm hoping Canada purchases some more to supplement the D/E boats we have now, the German boats being preferred IMO.  Anti aircraft launched missile systems through the tubes while submerged, cruise missile capable, decent torps, although not up the the MK48 ADCAPS we had to convert our Upholder classes to in order to use our existing stockpile of them.  The crazy thing is that the mods ended up costing 2x as much as the Spearfish torps we could have taken with the subs which were already fitted out for those.  We could have sold our Mk48's to a country that uses them, or even donated them, and still come out further ahead.  This is what happens when committees of civilians who don't know much about weapons or money get involved in military affairs up here.
« Last Edit: January 24, 2014, 06:31:00 PM by Gman »

Offline Rich46yo

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Re: New russian subs
« Reply #97 on: January 25, 2014, 04:06:42 AM »
Oh cut and paste the exact paragraphs, and paste the reference. Between your long links that DONT support what you say, and your 1,000 word diatribes, your giving me a head ache.
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Offline Gman

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Re: New russian subs
« Reply #98 on: January 25, 2014, 09:14:58 AM »
Using "your" when "you're" is called for gives me an equal headache.

I've spelled it out simply for you 2 times now, if you don't like challenging information and then not getting the results you like, that's your problem.  You asked me to provide reference that SSK AIP powered subs transit to operational areas at speeds between 10-15 kts.  I did so.  Twice.

You asked for reference that SSK AIP subs on AIP propulsion can move at 20 kts.  I provided it from 3 sources.  The AIP system which is tied into the electrical/battery powered systems can either cruise at 4-5 kts for 21-30 days on most models, or run at 20kts+ for about 24 hours, before needing to snorkel.  There are tons of power level settings in between, I can't cut and paste the graphs from a pdf, but it should take you less than 1 minute to look at all three in the sources I linked and see that at speeds between 12 to 15 kts, the number of hours each type of SSK AIP listed, about 4 or 5 types listed, varies slightly, and only really effects how often the sub has to snort or surface charge while in transit mode.  They can choose to tie in the fuel cell part of the AIP system, or just run on battery power while transiting, or use both simultaneously.

From source 1:

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At maximum speed (around 20 knots an AIP material will last about a day. This is in comparison to nuclear attack submarines moving at 34 knots fully submerged for 3 months)

From source 2:
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Transit speeds of 10 knts are therefore to be expected with snorting between once and twice a day.  Transit speeds of 12 to 14 knts are expected with snorting between 2 and 3 times per day

From source 3:
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SPEED: SSK design speed is governed by the need for an optimised quiet speed that allows the maximum time submerged on batteries/AIP, and a high top speed for transitand evasion.

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The SSK submarine hullform has been designed and optimized for a transit speed of 12-13 knts

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At submerged speeds greater than 14kts, it becomes beneficial to increase the proportion of the transit distance spent on the surface. This is due to the time spent snorting becoming dominant in submerged operation
- This paragraph speaks specifically to AIP SSK's transiting at speeds over 14kts, like 15 or slightly higher - the can still stay submerged, but slowing to 6 knts to snorkel and recharge become less efficient than surface charging - they don't HAVE to surface, it just becomes a slightly shorter trip if they choose to.  Point is, it's obvious the SSK's can transit at 10-15 kts from this paper, which is what you seem to be all wrapped up over, humbly demanding proof.  There it is, and this is just the tip of the iceberg from these reports or the dozens of others you can find on google.  I'm not going to hold your hand and cut/paste direct quotes or interpret graphs for you again - if you can't understand them, just ask for them to be explained by PM.  That, or you can PM KillnU, who is a chief with long service on a current SSN out of Hawaii, and see if any of this is wrong, and your opinions/ideas are right.


Offline Rich46yo

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Re: New russian subs
« Reply #99 on: January 25, 2014, 10:01:02 AM »
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At maximum speed (around 20 knots an AIP material will last about a day. This is in comparison to nuclear attack submarines moving at 34 knots fully submerged for 3 months)

Yeah thats a real nice try. You forget I can actually read. Heres the real quote
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At maximum speed (around 20 knts) an AIP material may last less then a day. This in comparison to nuclear attack submarines moving at 34 knots fully submerged for 4 months.
Its about 1/3 down the page if anyone wants to check. http://gentleseas.blogspot.ca/2012/03/australia-should-choose-nuclear.html
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will last about a day
is not the same thing as
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may last less then a day.
But I guess it sounded better to you.

I can expect the rest of your crap is dishonestly posted to. So Im not going to check it and Im done talking to you. BTW your an arrogant, insulting little cuss. As well as dishonest.

Have a nice day.
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Offline Gman

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Re: New russian subs
« Reply #100 on: January 25, 2014, 12:56:03 PM »
You'll notice that you can't cut and paste from that first document.  Try it, you can't click and highlight.  I typed it from memory, I'm sorry one word is missing or different, I humbly apologize.  The other 2 aren't much better, go try to cut and pasted from them, and watch what happens, it pastes everything in a vertical column and misses words, but I took the time to do it anyway with the last 2.

You did read the rest unlike your statement, you just don't like what you read as it doesn't agree with you.  The paper is actually called "Issues regarding SSK Transit times".  Anyone here can read it, it plainly states both points you originally didn't think were correct in fact are.

It's obvious from every paper I've read about SSK's that they typically transit at speeds of at LEAST 12 knts in peacetime conditions and factoring in other things like weather.

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Figure 14 shows how an average speed of 12 knots is achieved with the snort and submerged speeds stated above. In such a case a distance of 10,000nm would be covered in 34 days which is consistent with the likely provisions assigned to the mission.

Source:  http://media.bmt.org/bmt_media/resources/33/e-udt008-jb.pdf


Looking at some of your earlier arguments you've gotten into, you behave in pretty much the same manner.  You can call names all you like, I won't report you because I think it's humorous that you can't simply say that the material is right - that's where I got it from.  Do you think the subject subs we're talking about do transits at 4 or 6 kts or something?  It would take 6 weeks to get here, longer for the Israeli subs, they would be eating their shoes at that point on the smaller sized SSKs.  A German 212 sub did set a world record in 2006 doing 1500 miles completely submerged on just it's fuel cells, not running the battery part of the AIP loop as it didn't want to snort to recharge at all, which was part of the record.  But that's just on fuel cell power, not on the full AIP power capability with the battery tied in, not to mention 2 or 3 snorts a day.  Maybe that's what you're thinking of, who can say.

The next generation of SSK's aren't far away, and they'll be doing transits of 20 knts+, submerged, for long distances, thousands of nautical miles.   That's nearly a jump of 2x from 12 knts to 20 knts.  

http://www.bmtdsl.co.uk/media/1056784/BMTDSL-SSGT-Datasheet.pdf
« Last Edit: January 25, 2014, 01:25:54 PM by Gman »

Offline icepac

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Re: New russian subs
« Reply #101 on: January 25, 2014, 11:20:32 PM »
Cherenkov effect is cool and blue but I keep seeing people calling air that is beign subjected to ionizing radiation "cherenkov radiation" when it is not.

That is a cool picture of cherenkov radiation.

Offline kappa

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Re: New russian subs
« Reply #102 on: January 26, 2014, 03:15:20 AM »
Cherenkov effect is cool and blue but I keep seeing people calling air that is beign subjected to ionizing radiation "cherenkov radiation" when it is not.

That is a cool picture of cherenkov radiation.

lol  One attempting to take those pictures of the fuel assemblies suspended in the 'air' would not live to make it back to a computer to upload them..
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Offline Lusche

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Re: New russian subs
« Reply #103 on: January 26, 2014, 04:26:58 AM »
Steam: DrKalv
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Offline icepac

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Re: New russian subs
« Reply #104 on: January 26, 2014, 08:21:02 AM »
lol  One attempting to take those pictures of the fuel assemblies suspended in the 'air' would not live to make it back to a computer to upload them..


They would live a few weeks.