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23 Comments

  1. 1

    keshto

    Shiv can you check whether Arihant went through wind tunnel test pls ?¿

    Reply
  2. 2
  3. 3

    spanky's Blog

    Thats good news. does this means that HAT hass been completed for arihant?When they will start the sea trials?

    Shiv,Do u have any info abt the other 2 stuffs of Arihant class

    Reply
  4. 4

    Anonymous

    @keshto…
    lmao!!!

    Reply
  5. 5

    Mr. Ra

    Encouraging News…

    Reply
  6. 6

    Rahul

    @keshto Are you serious ?

    Reply
  7. 7

    Parthvader

    Oh what am I saying. Sorry.

    Re = (rho*V*L)/mu

    L is the length which compensates for scale. So you'd require a higher density fluid to simulate the real thing from a smaller scale model. Or change velocity or viscosity.

    So no wind tunnel in that regard but submarines don't always travel submerged, you have to consider the effects of drag when it's surfaced just like ships.

    It's pretty likely wind tunnel tests are done on subs. I know for sure they are done on frigates, destroyers because I've done one.

    Reply
  8. 8

    keshto

    6:16 PM and Rahul…

    Its not the whole sub, only its mock up version is tested because air works in the same way as a liquid, wind tunnels can be used to simulate the effects of water on a submarine hull.

    look at this sub being tested by NASA in the wind tunnel.

    And this YOUTUBE

    Now who has the last laugh ¿¿¿¿

    Reply
  9. 9

    Anonymous

    Where is the TAX PAYER? haha!

    Reply
  10. 10

    Kunal

    CNS Admiral Verma is not known to giving sound bytes and hence what intrigues me is that it directly contradicts what Prasun K. Sengupta has been consistently maintaining that this Arihant will be nothing more than a mere TD. I now look forward to Prasun either rebutting it or doing some serious alternative explaining as to how this has come about.

    Reply
  11. 11

    Anonymous

    Ref remarks of Turbulence@Keshto.

    Turbulence,drag,flow and other such dynamics are basically the same whether in liquid or gas.For example a Submarine diving planes or a hydroplanes are acting like the control surfaces,eg flaps,rudder for an aircraft.
    Image:

    http://www.nasa.gov/multimedia/imagegallery/image_feature_916.html

    Reply
  12. 12

    Anonymous

    Nuclear Weapons on our TD platform is a HSE issue for us as well as for our enemies. Let us put the sagarika's with conventional warhead for timebeing; until we get some more confidence in submarine building.

    Reply
  13. 13

    Anonymous

    keshto
    Its a submarine not a jet!!!

    Reply
  14. 14

    Prasun K. Sengupta

    To Kunal: The soundbytes of the CNS by themselves are self-contradictory. For instance, when one talks of deterrent patrols, what is the CNS referring to? Going out equipped with 700km-range K-15 SLNMs? Does he mean to say this will suffice to deter China? And what makes one so sure of the commissioning timeframe? Does the CNS mean to say that the crew complement of the Arihant is all ramped up and type-certified to make the Arihant an operational SSBN within a two-year timeframe? One just has to look at the Navy's experience with the K-152 Nerpa/Akula-3 SSGN and the difficulties still being encountered in terms of type-certification of the on-board crew complement, and then draw the right conclusions about the human resource challenges likely to be encountered in the Arigant's commissioning process. Even if one assumes that the Arihant's sea trials are glitch-free, one will have to contend with the weapons qualification phase of the SSBN, i.e. certifying the K-15 as seaworthy and flight-capable while on-board the Arihant. Does the CNS mean to say that ALL these challenges will be overcome within a two-year period for a navy that has had no prior experience in operating operational SSBNs, when experience suggests that even the P-5 countries had to endure years of trial-and-error processes when they first launched their respective SSBNs? An what about ensuring the Arihant's survivability when undertaking such deterrent patrols? To my knowledge, no existing operator of SSBNs undertakes deterrent patrols without the protection of SSNs/SSGNs. From where and when will the Navy acquire such SSNs/SSGNs to ensure fool-proof long-distance deterrent patrols to be undertaken by the Arihant?
    Clearly the CNS was offering politically sound soundbytes that are operationally unsound, something his successor will, in all probability, will have to explain by late 2011.

    Reply
  15. 15

    Mr. Ra

    Aerodynamic properties in many aspects can have similarities with hydrodynamic properties with some empirical or proportionate changes. Aerodynamics at say 0.3 to 0.5 Mach can be a better and more sensitive judge of the ocean going objects than the the hydrodynamics itself.

    Reply
  16. 16

    keshto

    The submarine journey is faster submerged than otherwise, so in spite of having 35% of submarine protruding in the atmosphere, whose density is eight hundred times lower than marine water, the prowess of the fluid makes submerged (sub) move more efficientely…..

    Mr. Ra:
    Well said!

    Reply
  17. 17

    Kunal

    To: Prasun K. Sengupta,
    Thanks for the response and I would tend to agree with your argument as I myself was skeptical about the statement and hence provoked you. I was reading Bharat Karnad and how India has been indulging in nuclear bluff and as to the dangers of how that bluff may be called one day by any of our adversaries. I do agree there are far too many critical stages yet to be cleared by Arihant.

    Reply
  18. 18

    Anonymous

    some dumb questions.. has the brahmos entered production, n if yes how many systems r thr approx?

    Reply
  19. 19

    mirza

    we have one more rajat pandit who start being negative again & again he is none other our Parsun k.

    Reply
  20. 20

    Prasun K. Sengupta

    To mirza: Suit yourself, for unlike you I'd rather stick to objectivity and face the reality, instead of being dragged by the nose by the the mere perception of reality! It is most unfortunate that you equate objective rationale with negativity–comething that could prove expensive for you in future.

    Reply
  21. 21

    Prasun K. Sengupta

    To Kunal: If you listen to the soundbyte on what the CNS said on December 2 (at http://www.stratpost.com/indian-ssbn-to-complete-nuke-triad-by-2012), you will realise that now
    here does he mention that the Arihant WOULD or WILL put to sea by 2011 or 2012. What he actually says that "as I explained last year, we expect it to get going within two years,….what I'm telling you is that if it goes to sea as an operational leg of the nuclear triad….and the triad will be there when it comes." By listening to his direct quote, it does seem that he was giving a fair and cautious assessment but noweher does he pin down a certain date or a definite timeframe. This is where the members of the mass-media in general have failed us by misquoting the CNS and wrongly reporting that the Arihant will begin going out on deterrent patrols by 2011.

    Reply
  22. 22

    keshto

    Prasun:

    Even the HAT trial is far from being over, the reactor is not yet critical, and we hear people talking about SAT. IMO poor folk judgement…

    Reply
  23. 23

    Anonymous

    India must get real! One Arihant never made a navy; neither will two or three.

    Manufacturing anything but nuclear-powered submarines is a WASTE of money. Get it that diesel fuel for ships is going to come at a premium in only a few years (perhaps five). Consequently, your ships and submarines will be sitting ducks for aggressive navies.

    Next, India needs three lines of nuclear-powered submarines manufacturing two submarines a year each. That's the only way to play catch-up with China within this coming decade. Does India really realize how far it has slipped behind China? I don't think so! Wait a few years, and China will teach India it's Lesson #2. India is really suffering from an attention-deficit disorder. I don't see it recovering!

    Reply

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