Thales Watchkeeper WK450
|Flight trials at Parc Aberporth in 2013|
|Role||Unmanned aerial vehicle|
|National origin||United Kingdom|
|First flight||14 April 2010|
|Status||In limited service|
|Primary user||British Army|
|Developed from||Elbit Hermes 450|
The Thales Watchkeeper WK450 is a Remote Piloted Air System (RPAS) for all weather, Intelligence, Surveillance, Target Acquisition and Reconnaissance (ISTAR) use by the British Army, provided under an £800 million contract awarded in July 2005 to Thales UK.
The Watchkeeper WK450 is based on the Elbit Hermes 450 UAV. The engine is a rotary Wankel engine. It has a mass of 450 kg and a payload capacity of 150 kg, with a typical endurance of 17 hours. It was originally intended to enter service in June 2010.
The Watchkeeper is built in the UK by a joint venture company, UAV Tactical Systems (U-TacS), set up by the Israeli company Elbit Systems (51% ownership) and French company Thales. UAV Engines Ltd, who build the rotary engine in the UK, is a wholly owned subsidiary of Elbit Systems. The majority Israeli ownership has caused some unexpected problems obtaining U.S. export authorisation for anti-icing components. A prime difference between the Hermes 450 and Watchkeeper is that the 450 is fitted only with an electro-optical/infrared sensor, while the WK450 has a dual-mode synthetic aperture radar and ground moving target indication that allow it to see through weather conditions such as dust storms that the Hermes aircraft can not.
On 15 July 2007, the UK MoD revealed that 54 Watchkeepers will be delivered to the British Army. The average cost to the taxpayer is therefore £800m divided by 54 aircraft, approximately £15m per platform. However, this figure includes construction of new basing facilities at Boscombe Down airfield, ground training facilities and simulators at the School of Artillery, Viking armoured vehicles and other equipment for tactical parties, ground control stations, development and testing of extensive aircraft modifications including automatic take-off and landing and the integration and provision of new sensors including radars.
In October 2010, the contract was extended by a further 18 months, and the delivery date slipped. Deployment by the Royal Artillery was said to be imminent in 2013, though certification by the Military Aviation Authority was still awaited. As of 2013, the programme was running about three years late; in September, release to service approval was expected to be granted before the end of the year. British Army officials said the Watchkeeper could enter service in spring 2014. As of January 2014, 26 air vehicles have been produced with another 28 on order, and 14 ground control stations have been produced with one more on order. Watchkeeper aircraft had performed over 600 flights totaling 950 flight hours. The Watchkeeper system will be in service with the British Army until 2040.
The Royal Artillery has a future aspiration to weaponise Watchkeeper.
In March 2014, the Watchkeeper was cleared for military flight training with the Royal Artillery. Operating out of Boscombe Down in Wiltshire, 1st Artillery Brigade is training with the Watchkeeper in restricted airspace over Salisbury Plain between 8,000 and 16,000 feet.
On 29 September 2014, the MoD revealed that an undisclosed number of Watchkeepers had become fully operational and sent to Afghanistan. The aircraft were stationed at Camp Bastion to provide force protection for British troops as they drew down from Afghanistan towards the end of the year. There had been no prior indication that the Watchkeeper would be sent to Afghanistan before the NATO-led International Security Assistance Force completed its mission. The aircraft worked alongside Hermes 450s that it is derived from, although the Watchkeeper carries a twin payload of an electro-optical/infrared sensor and a synthetic aperture radar.
One system of four Watchkeepers was sent to Afghanistan in August 2014, performed its first in-theatre flight on 2 September, and conducted the first operational flight on 16 September. One mission had a Watchkeeper providing wide-area surveillance for U.S. Marines using its Thales I-Master radar, which then cued a Hermes 450 to continue tracking, which then passed the information on to a Royal Air Force MQ-9 Reaper to conduct an airstrike against a target. Some 140 flights were conducted for 8 hours a day until operations ceased in mid-October. One reason the WK450 was deployed so late in the conflict was to use its dual-mode synthetic aperture radar and ground moving target indication, which the Hermes 450 lacks, to identify Taliban fighters attempting to hide under the cover of dust storms; when the ground-based radar coverage at Bastion was switched off, the British Army stopped using the interim leased Hermes 450. Once operations in-theater ceased, the Watchkeepers were brought back to the UK. Full operational capability is to be achieved in 2017 with enhancements including de-icing features, rough strip capabilities, and others.
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|Wikimedia Commons has media related to Thales Watchkeeper WK450.|
- Official website
- Announcement of contract in the House of Commons, Hansard column 86WS, 20 Jul 2005
- UK Gives $1.23B Green Light to Watchkeeper UAV, Defense Industry Daily, 25 July 2005
- Watchkeeper bidders, Spyflight