PRC/PLAN Laser and Rail Gun Development Thread

Power the rail gun as in its drive system and electronics? That doesn't have to be included as a conventional gun system would consume that energy from fuel as well.
Yesterday at 3:40 PM
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46fa23ea8d48e73cfb743d623c3e6661.jpg
 

kurutoga

Junior Member
Registered Member
Power the rail gun as in its drive system and electronics? That doesn't have to be included as a conventional gun system would consume that energy from fuel as well.

Railguns probably requires more cooling (my guess) but then the AGS rounds are more expensive in all three situations (dumb round, GPS guidance, rocket propelled + terminal guidance). I thought your estimates are pretty good!
 

hkbc

Junior Member
I now went through what had been posted here while I slept, will react just to Western-fanboish claims; number two (#1 is right above):
... did your sales talk refer to the unarmed vessel, which limped to San Diego, with "the current DDG-1000 can"? LOL!

There are various issues with current (i.e. western) IEP systems but they are different issues, the Royal Navy's TYPE 45 destroyers have issues with the heat recovery system associated with the special gas turbines it uses not working well in high ambient temperature environments. The DDG-1000 has issues with power distribution to its electric motors and issues with lube oil chillers causing overheating problems, but the GT gensets are essentially sound. The Queen Elizabeth aircraft carriers had a leak in it's drive shaft mounting but that's nothing to do with the IEP. The apparent superiority of the Chinese IEP is bandied around as a given but that's only the DC electrical distribution grid, the quality of the gensets, the motors etc have yet to be observed. Also the power ratings bandied around for the Type 055 is the shp of the Gas Turbines not the electrical output of it's gensets, shouldn't conflate the 2, although given the massive size of the 055's radar arrays it will probably have substantial electric generation capabilities, these will not be integrated with the drive for the propulsion.

Assuming the 055's basic hull form design is a sound gunnery platform (despite all the hot air spouted about VLS, radar etc a ship needs first and foremost to float and be stable in rough seas, all the gizmos in the world won't help if its not seaworthy!), the insides will still have to go through major rework to accommodate IEP and EM guns. These are not a drop in replacements, with electric drive there won't be gearboxes but room needs to be found for the electric motors, IEP allows the drive shafts to be shortened to free up space since there's no need for direct connection to the GTs but multiple redundant armoured and water tight routes will need to snake around the vessel to get the power to where it's needed, as power generation is integrated diesel sets can be used as well or instead of GTs as they don't need the airflow hence trunking space can be reclaimed and allowing more flexible placement, if the EM gun fires inert rounds, then weight can be saved in the magazine space which now doesn't necessarily need to be below the waterline as is practice for conventional ammunition. The sheer size of the 055 helps but at the end of the day all this might mean the need for total redesign for a vessel optimised for 'electric wafare'
 

hkbc

Junior Member
yeah, Today at 8:18 AM I just reacted to the laughable post
#321 SilentObserver, Today at 6:54 AM
claiming

"Yes, it means a combination of things, the current DDG-1000 can:
  • Sustain ..."
... blah blah blah while the Zumwalt is an unarmed cripple now

I suppose given they're only building 3 of them and their problematic gestation they should just leave them as training or test ships for new tech rather than front line war fighting vessels! Although the Chinese solution of using an LST is a lot quicker and cheaper and people wonder where all the US defense budget goes :)
 
here:
... the Royal Navy's TYPE 45 destroyers have issues with the heat recovery system associated with the special gas turbines it uses not working well in high ambient temperature environments. ...
I wonder if they started yet (yes, I now googled
Project Napier
and didn't see anything new)
or still don't have several hundred mil to fix the backbone of the RN?!

here's some background:
Mar 20, 2017
...

Type 45 Destroyers:Written question - 67575
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Q
Asked by
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(Portsmouth South)
Asked on: 13 March 2017
"To ask the Secretary of State for Defence, when he plans to award contracts for the Power Improvement Project for the Type 45 destroyer class."

A
Answered by:
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Answered on: 16 March 2017
"On current plans, we anticipate that the Ministry of Defence will be able to award the contract for the Power Improvement Project for the Type 45 Destroyer class in early 2018."

...


Feb 6, 2016
...

"The Type 45 uses a pioneering system called Integrated Electric Propulsion (IEP). There are many advantages associated with IEP, fuel efficiency, flexibility in locating the engines and a supposedly reduced maintenance and manning requirement. In basic terms, two WR-21 gas turbines (GTs) and two Wartsila 2MW diesel generators provide AC power for the motors that propel the ship as well as the power for the ships systems – weapons, sensors lighting etc. The WR-21 GTs were designed in an international partnership with Rolls Royce and Northrop Grumman Marine Systems. The turbines are of a sound design but have an intercooler-recuperator that recovers heat from the exhaust and recycles it into the engine, making it more fuel-efficient and reducing the ship’s thermal signature. Unfortunately the intercooler unit has a major design flaw and causes the GTs to fail occasionally. When this happens, the electrical load on the diesel generators can become too great and they ‘trip out’, leaving the ship with no source of power or propulsion."

"The funding for the “Type 45 machinery improvement package” was agreed in the November 2015 SDSR and at least the problem has finally been recognised and funds are in place. Each vessel will have to be dry-docked, large openings cut in the hull and two new diesel generator sets slid into place."

etc. etc.
Putting the Type 45 propulsion problems in perspective
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