China's subs in Indian Ocean no worry for India - Opinion - Chinadaily.com.cn
See for urself ,ur own chinese newspaper clearly mentions her surfacing around malacca.She probably did so more than once.This is because her normal speed is 16-18 knots.The distance from IOR to hainan island along the route is thousands of miles.
Just so you understand,the mode of operation of diesel and AIP.Previously u could only submerge using ur batteries in a diesel submarines,batteries need recharging.In ww2 recharging frequency would be once every 2 days generally.Now once a week for a non-AIP submarine.
Now what AIP does is complement the batteries and allows it to stay submerged without using batteries.This increases submerged duration from 1 week in general,to 3 weeks more or less.
But here u make serious miscalculations,when u are using AIP u can use maybe 1/4th of the submarines actual speed-generally a pathetic 4knts/5knts.So in this state sure it can stay hidden longer but its almost useless as hunter against normal ships of speeds over 20 knots in high seas/or making a long travel.But this is ideal for ambushing nearby ships by laying in ambush on the seabed or moving very slightly submerged silently,a great tactic in shallow waters .
So if u use AIP on chinese sub on a non stop travel to IOR u won't really make much difference,u increase non surface time by 2 weeks but reduce speed by 1/4th in the process so it will take much much longer to cover distance .Even with AIP any sub will have to surface for ops in IOR near indian waters,also u better hope to have a nearby refuel port because otherwise its a one way trip for a SSK from china because even the latest yuan has an endurance of 2 months only.This one took close to a month to get into IOR .U use AIP speed 1/4th.Then u either get refuelling somewhere or its one way trip,because best yuan's endurance can take is one straight trip and then straight back-and pushing it.None for any sustained ops or duration spent in indian ocean ,making the whole exercise pointless.
Understand here endurance doesn't mean time it remains fully submerged.Endurance means time till food and fuel stocks last.
Continous submerged time is generally 1 week for ssks,and 2 more AIPs.But in AIP mode ur movement is slowed to a crawl,almost static so its useless for long range deployments.There is a reason russia/usa continues to make enormously costly SSNs like yasen and virginia in numbers which maybe 5 times as costly as diesel subs despite AIP being around.Because of these limitations.
Now onto sale of ur submarines.unrelated.Because pakistan and thailand will operate them from their nearby shores-short range,role they are designed for.Being coastal water navies these modern submarines are cheap too and will help their navies greatly.It is completely unrelated to fantasy of chinese diesel subamrines operating undetected travelling all the way from china theory that you are propounding.
Don't remember making a serious personal insult,may have gotten heated during discussion earlier.Apologize if u took that to heart.