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Wanshan

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Viewing 15 posts - 1,786 through 1,800 (of 3,544 total)
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  • in reply to: USN SSK? #2035986
    Wanshan
    Participant

    How difficult would it be to come up with scaled down SSN for an SSK?

    Wanshan
    Participant

    http://www.china-defense.com/forum/uploads/post-538-1240818783.jpg
    The stuff’s already on her deck as she is being moved.

    http://www.centurychina.com/plaboard/uploads/13-2007-Dalian-Overhead.jpg
    But the amount of stuff on deck has certainly increased.

    Wanshan
    Participant

    Don’t know about the tides in the area but the Varyag isn’t something you want to let drift around on a wim. She represents a fairly big shipping hazard so the tugs would need to keep her in close check. Actually if you look at the recent pics of the INS Vikramaditya being towed out they are doing pretty much what is being done with the Varyag:

    Agree, but difference of Varyag with INS Vikramaditya is that the latter has al this stuff welded to her a>$>$ so there is something for the tugs to push up against. Unlike Varyag, which has no a>$>$-enhancements.

    :p

    Wanshan
    Participant

    they are probably fitting more than just engines, a lot of changes under water. We saw pictures with a bunch of containers on the flight deck. Looks like they are going to do some work to allow it to sail off on its own power.

    Those containers have been there (near where the missile launchers used to be) for a long time, I don’t think they signify anything new.

    Wanshan
    Participant

    She had several tugs in close attendance, if it was a short move they might not want to set up a full tow line but rather nudge her in the direction they want.

    a tug each on the port and starboard frontflanks for steering and a couple of tugs in the rear for moving. What would those latter tugs be pushing up against? Rudders?

    What are the tides and streams doing overthere (could you just float her, using the natural flows and current, with tugs just for steering and braking?)

    Wanshan
    Participant

    Why is it such a issue to just fit the ex-Varyag with new engines…………As she never had them to start with.

    a. she was delivered without propulsion (which is not necessarily the same as having no engine > you may have to remove whatever non-functioning parts of the original propulsion systems remain, after years of neglect)
    b. you gotta have a suitable new powerplant (or parts thereof) to install
    c. you gotta actually install it (which may or may not require serious – and possibly notable – hull surgery).

    in reply to: Special Tail Navy Hawk #2036236
    Wanshan
    Participant

    The issue was not Hawk > Goshawk
    Rather it was Goshawk > Goshawk-100/200 versus AMX-ATA2 > Naval AMX

    Wanshan
    Participant

    It has no engines. It may be moving to be refitted. That may include propulsion machinery.

    Incidentally, that may just be ‘it has no functioning engines’…

    In the pics I’ve seen, there are no tugs towing. However, there are also no wake and no exhaust from the stack. So, it is anybody’s gues if she moved under her own power.

    But you don’t put a ship in drydock unless you plan to do something to it….
    and you don’t need the ship in drydock to fit it out…

    Wanshan
    Participant

    It has no engines. It may be moving to be refitted. That may include propulsion machinery.

    It may also be moving just to make space at the quay, but taken with the fact that it has had some work done on it recently, including painting, and the fact that noises out of China are that they are embarking on a carrier programme…..

    …of course this is news. Whether this will culminate in any ground breaking changes is another matter.

    Moving it may have freed up pierside space, but it is now taking up drydock space … it all depends on what will happen in the drydock. Fitting out would not (need to) take place in the drydock.

    in reply to: Special Tail Navy Hawk #2036370
    Wanshan
    Participant

    Yet, the Hawk (T-45) is available in a Naval Version. The AMX is not and would require a far more extensive modifications. For Naval use………

    Well, that all depends on how much modification is actually required….

    Besides, don’t underestimate the work needed to turn the T-45 trainer into a T-45-100/200 either (e.g. wing strengthening to go from just 2 underwing hardpoints to 4 plus 2 wingtip rails – combat wing – as well as a fuselage centreline hardpoint, the nosejob, the taller tailfin, different cockpit/avionics…)

    in reply to: Special Tail Navy Hawk #2036405
    Wanshan
    Participant

    Would be a perfect solution for the Brazilian Navy!:D

    Which would in that case likely prefer a derivative of the local AMX-ATA, for obvious reasons.

    in reply to: Arleigh Burke Class ASW #2036422
    Wanshan
    Participant

    Aren’t the current LM2500 systems much improved over the originals? More power/less fuel burn, etc? The aircraft engines upon which they are based made many, many improvements throughout the life of the CF-6 program, going from the CF6-6 to the CF6-80C. One would hope the noise signature had been improved also, but I confess I have no knowledge of such.

    I figure, so long as they are in a well sound proofed enclosure, the noise level of the unit is not the issue.

    in reply to: Arleigh Burke Class ASW #2036685
    Wanshan
    Participant

    If they were so quiet Wan why was that SQR-19 quite so long an array! 🙂

    Seriously they were blue water platforms with the intent to get detects at least 2CZ’s off with the tail before Sov SSN’s of the vintage could get much of a sniff. Were they ‘quiet’?. Only in the sense that they were less noisy than the equivalent steam and turbine powered escorts of the day.

    Same sort of thing as the Victor-III’s. Were they quiet and discrete…..compared to Vic-1 and -II yes. See my point?! :p

    Well, the all Gtu plant helped. The propulsion machinery is very quiet. The whole engine installations are insulated against the own noise and that promotes the ASUW and the operation of the sonar installations. Also, IIRC they had the PRAIRIE-MASKER hull and propeller bubbler systems installed to enhance their quietness.

    The Spruance class as was commissioned between 1975 and 1983. It was the first U.S. ship class to use gas-turbine propulsion and advanced self-noise reduction technology and a high degree of automation. By contrast, the first Type 23 was commissioned in 1989 and preceeded by at least 2 classes of Gtu powered ships! Thus unfair to compare to the much later Type 23.

    The later Arleigh Burke destroyers are powered by the same drive train as the Ticonderoga cruisers and Spruance destroyers, namely four General Electric LM 2500 gas turbine engines (LM 2500-30 gas turbine engines in the case of the Flight IIA ships). Propulsion is provided by two shafts with variable pitch screws. They too have the PRAIRIE-MASKER system.

    in reply to: Arleigh Burke Class ASW #2036744
    Wanshan
    Participant

    Then you have the issue that the Burke design is a big GT propelled destroyer and accoustically presents a profile as such. Contrasted against a design optimised for ASW, like Type 23, the Burke would be a very much easier target for counter detection and tracking from the submarine.

    Well, the Spruances weren’t exactly small yet very quiet in their day So much so they were deployed away from other ships, or so I’ve read.

    in reply to: Indian navy – news & discussion #2036749
    Wanshan
    Participant

    What sensors/electronics have been chosen for the ship(ex-Baku, now AD. Gorsh., to be Vikramaditya)?

    Who will create/install the command and control suite (hardware+software) for the ship?
    Or will the ship retain and run on the old stuff?

    According to online information on the ship it had some sort of experimental phased array radar and some soviet anti submarine suite.

    http://www.globalsecurity.org/military/world/russia/1143.htm

    Judging from models and CGs, she will be fitted with a radar out of the Fregaet MAE line plus a larger Podberezovik long range (500km) 3D air search/surveillance radar (like the one installed on Kara class cruiser Kerch)

Viewing 15 posts - 1,786 through 1,800 (of 3,544 total)