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PostPosted: Thu Dec 12, 2019 6:08 pm 
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A significant portion of the full article compares the Type 045 air warfare/air defence capabilities/shortcomings with the Arleigh Burke class:

UK Defence Journal

Quote:
Improving the Type 45 Destroyer
By
Guest Contributor
December 4, 2019
The purpose of this article is not to examine yet again the much discussed propulsion problems of the Type 45 but rather to consider how the type can remain relevant in the face of significant threats posed by advanced aircraft and missiles.
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They are now equipped with at least one Phalanx. In comparison the T 45s have forty-eight A 50 Sylver cells for MBDA Aster 15 and Aster 30 SAMs. Additionally each ship is equipped with two Phalanx CIWS, while four T45s may be equipped with eight canisters for Harpoon missiles at any one time, the Harpoons having been removed from the Batch 3 Type 22 Cornwall class frigates when they were decommissioned in 2011.
These figures would appear to afford the Arleigh Burke class an overall superiority in terms of AAW capability. However, there are some factors which are not apparent in the statistics which tip the balance in favour of the T45. The Burkes are equipped with the Aegis combat system which currently uses the Lockheed Martin AN/SPY-1D(V) S-band radar featuring four passive electronic system arrays (PESAs) as the primary system for threat detection, searching and tracking targets at a range of 189+ nmi (350+ km). Being a PESA radar it cannot provide target illumination for Semi-Active Radar Homing (SARH) missiles of which the SM-2 and ESSM Block 1 are the most widely used examples. These missiles must be guided to a target by three SPG-62 continuous wave illuminators (CWIs) controlled by a Raytheon Mark 99 fire-control system. This places the Burkes at a considerable disadvantage if a destroyer was to experience a saturation attack of twenty to thirty AShMs because the mechanically steered SPG-62 can only guide a limited number of SM-2s at once.
These shortcomings will all begin to be addressed from 2023 on Flight III Arleigh Burke destroyers which will be equipped with the introduction of the AN/SPY-6 active electronic scanned array (AESA) Air and Missile Defense Radar (AMDR). Together with active radar homing (ARH) SM-6 and ESSM Block 2 missiles these destroyers will be formidable AAW and ballistic missile defence (BMD) platforms and gain superior capabilities over and against the T45.
The T45 features the BAES SAMPSON S band AESA multi-function radar (MFR) which is primarily used for fire control, although it can also carry out long range search to a distance of 216 nmi (400 km). It is the radar component of the Sea Viper air defence system, the other being MBDA Aster SAMs. SAMPSON features two back-to-back planar arrays which rotate at 30 revolutions per minute leaving no area of the sky without coverage for less than 0.5 seconds. Being smaller and lighter than fixed radar arrays such as the AN/SPY-1D(V) or the Thales Nederland Active Phased Array Radar (APAR), SAMPSON is sited approximately double the height of either and consequently has a considerable advantage in its ability to detect sea-skimming targets over a longer range. Early detection of such threats was one of the lessons coming out of the Falklands war as was the necessity to have the maximum number of missiles available to bring to bear on incoming targets.
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PostPosted: Fri Dec 13, 2019 3:23 am 
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I thought the RN retired Harpoon several years ago?


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PostPosted: Fri Dec 13, 2019 3:33 am 
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That was the plan but they are to be continued in service as the UK has no other anti-ship missile. If you look at photos of the Type 45s you will see that occasionally they are equipped with Harpoon but often they are not. I assume that the numbers of serviceable missiles is dwindling and they have to be carefully husbanded.

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PostPosted: Sun Sep 12, 2021 8:52 pm 
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An update:

UK Defence Journal

Quote:
All Type 45s to have received engine repairs by mid-2020s
By
George Allison -
September 8, 202147
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The Ministry of Defence have confirmed that all Type 45 Destroyers will have recieved upgrades to their power systems by the mid-2020s.

In 2016 it was revealed that due to a design flaw on the Northrop Grumman intercooler attached to the ships Rolls-Royce WR-21 gas turbines, power availability was diminished considerably when functioning in the warm climate of the Persian Gulf; and it quickly became apparent that the class was not operating as originally envisioned with some losing power mid-deployment.

(...SNIPPED)

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