>The Russians tested a Kilo fitted with a pump-jet to analyse its pros and cons came to the following conclusion.
>Pump-jets are primarily used to reduce cavitation noises which are prominent during acceleration and deceleration. >Cavitation noise goes down as depth increases. >Russian boats traditionally operate at higher depths compared to western boats, a tactic usually used to get rid of trials during cold war. >Below 500m, there is virtually no cavitation even at high speeds. >Every pump-jet has an optimal speed for noise reduction, beyond which it acts like a resonance box thus limiting the range of possible speeds for a submarine.
>Thus they don’t need pump as their overall design and capabilities take care of the requirement. The Boreis need them as they would need to operate near the surface for launching their ballistic missiles and hence Boreis have pump-jets while Kazan and the lead boat (885 Yasen) don’t.
some of it's bullshit to an extent the soviets liked to operate at higher depth often enough simply because of their chin mounting of their forward arrays because of the autoloader placement. which was always in contradiction to the double hull deep diving design of their pressure hulls.
additionally he's kinda ignoring the one of the main zones that virgina's have been optimized for, which is within the littoral zone.
Ryder Butler
>additionally he's kinda ignoring the one of the main zones that virgina's have been optimized for, which is within the littoral zone.
He's talking about Russian subs and why they like traditional propellers and not using pumpjets, he's not talking about Virginia.
Colton James
>chin mounting of their forward arrays because of the autoloader placement. which was always in contradiction to the double hull deep diving design of their pressure hulls. Go on?
Julian Johnson
>Pump-jets are primarily used to reduce cavitation noises which are prominent during acceleration and deceleration. >Below 500m, there is virtually no cavitation even at high speeds. >Every pump-jet has an optimal speed for noise reduction, beyond which it acts like a resonance box thus limiting the range of possible speeds for a submarine. Very interesting, so pumpjets are useful for shallow depths at certain speeds.
Do you have a source?
Landon Bennett
he's talking about the kilo which is pretty much meant to contest Virginias out of coastal waters by ambushing them and being quiet. a pump jet is infinitely superior if you want better speeds in shallow waters which is part of why kilo can only do something like 7 knots quietly with a traditional screw.
the real reason like usual for russians lacking tech like pump jets is that they have always been behind on this aspect of propulsion design and it's is stil prohibitively expense for them to put it on anything and everything.
not to mention there really aren't any post soviet submarine designs currently in the russian navy even the yasens have such origins
Brayden Williams
The Russians stopped with pumpjets because they couldn't keep Alrosa out of maintenance for very long, which says more about the ongoing issues with upkeep in the Russian Navy than anything.
The submarine’s propulsion system consists of two diesel generators, a main propulsion motor, a fuel-economic motor and a single shaft driving a seven-blade fixed-pitch propeller.
There are two additional stand-by motors for running in shallow waters, at mooring and in cases of emergency. Two 120-cell storage batteries are installed in the first and third compartments of the submarine. The main machinery is equipped with an automatic control system.
>Shallow water thrusters are Russian conscripts But where do the oars come out of from within the hull?
Xavier Lee
I think you're fooling yourself if you think that you're only going to be operating at deep depths
Noah Sanders
That was in response to who says >not to mention there really aren't any post soviet submarine designs currently in the russian navy even the yasens have such origins
he's not wrong the borei was designed in the 1980's and only has a pump jet due to the very small numbers produced an being built decades latter than indended
Daniel Bell
Id like to operate in your littoral zone,user.
Wyatt Carter
>the real reason like usual for russians lacking tech like pump jets is that they have always been behind on this aspect of propulsion design and it's is stil prohibitively expense for them to put it on anything and everything.
you cant be serious this is on the same level as with the "russian doesnt know how to built rockets and missiles" meme
Andrew Peterson
what are you smoking ? pump jets on nuclear subs is the only way that it makes any sense what so ever because its the only way to elliminate cavitation at high speeds
something that a conventional sub cant do
Dominic Wilson
They could use thrusters like these if they're not deep enough.
James Watson
every time I see these threads I am always surprised at how well the information security is and how almost everything that is said is wrong about submarines
Any topic about any military hardware is awful here. Its almost exclusively whatifisms by neverserveds, euronogunz and subhumans from all walks of life. Incredible.
Elijah Wright
The Attack class uses pumpjets and it's non-nuclear. Then again, they're basically chop shop Barracudas, and it's likely the French simply didin't bother changing the design.
Owen Rivera
I too use ruffles to propel my submarines
Nathaniel Stewart
Inferior American ships use caterpillar drives, while superior Russian subs have crocodile drives. But the most impressive is the Chinese subs which are fully equipped with Caracal drives.
Luke Cook
That's old model submarine, Chinese new model submarines use Cuantum Drives!
Adam Wood
Jow Forums is an F-16.net echo chamber, saying that it is exclusively subhumans from all walks of life is very rude.
Wyatt Watson
>Attack class
yeah i love how they say it has such a over the top range its like physics dont apply to them
if you understand what happens in the low speeds you know aussies are fucking lying
David Mitchell
>/aspi/ >A literally autistic source
Eli Walker
at least try to sound sane for once and READ the god damn article and the sources before you comment back with /b/ level of tardness
Matthew Bailey
>meant to contest Virginias out of coastal waters by ambushing them and being quiet. a pump jet is infinitely superior if you want better speeds in shallow waters >ambushing them >better speeds in shallow waters
Why would you want better speeds in shallow waters when you're trying to ambush them?
Isaac Parker
Newfag gtfo
Brayden Young
I detect a smidgen of butthurt that Ausgov didn't get the Soryu.
>Shoving an AR-15 into your ass while dressed in women's clothes somehow gives local fatnik retards who never opened a single military think tank article any authority on discussing military hardware Please, fuck off back jerking off to your pistols and watching anime.
sorry m8 your desperate attempts to equate f-16.net with arfcom have and always will fail. That forum in a single poster has more knowledge about boxing then you will ever have in your entire life. sorry not sorry.
William Nguyen
>sorry not sorry. I cringe when some zoomer spouts some cringey stuff like this.
Carter James
cry about it lmao XD
Anthony Williams
>in formation ivan farts ilya and artyom just look at him like DUDE BLYAT
