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Thales Watchkeeper WK450

Reconnaissance Unmanned Aerial Vehicle (UAV) [ 2014 ]

The Thales Watchkeeper WK450 Unmanned Aerial Vehicle is the British-modified equivalent of the Israeli Elbit Hermes 450 UAV series.

Authored By: Staff Writer | Last Edited: 07/02/2020 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

The Thales "Watchkeeper" WK450 is the British Army derivative of the Israeli Elbit "Hermes" 450 Unmanned Aerial Vehicle (UAV) - or simply "drone" as it is referred to in mainstream media. The British military is currently working with Thales through the development of the Watchkeeper that is intended to serve in the intelligence gathering, surveillance and target acquisition role for near-future battlefield service. The program began in 2005 and has since seen a service entry delay of three years along with growing project expenses to the point that Watchkeeper has been under threat for cancelation or restructuring altogether. As it stands in October of 2013, the Watchkeeper is undergoing active training with British personnel in Wales and is awaiting full certification for use in manned airspace in southern England where it will be used in conjunction with artillery training (Boscombe Down). During its commitment in Afghanistan, the British Army has relied on the American General Atomics MQ-9 "Reaper" and Israeli "Hermes" UAVs though these have always been viewed as interim solutions not entirely tailored to British Army needs.

The Thales Watchkeeper makes use of a single Wankel rotary engine driving a propeller assembly at the rear of the fuselage. The fuselage is of a cigar shape with an aerodynamically-refined nose cone. Wings are straight appendages mounted at the shoulder while the tail unit sports a pair of outward-canted vertical fins negating the use of horizontal tail planes. The undercarriage consists of a three-legged arrangement with each leg managing a single wheel. The undercarriage is static and does not retract. An optics assembly is seated just aft of the nose leg with full 360-degree traversal. An air inlet is fitted at the extreme end of the fuselage underside to aspirate the Wankel engine installation. As the Watchkeeper is not (yet) cleared to carry external munitions of any kind, its payload of up to 150 kilograms is made up mainly of optics and special mission equipment for its intended battlefield roles. The onboard engine and fuel stores configuration supply the aircraft with a mission endurance window of some 17 hours before returning to base. Overall, the Watchkeeper system is intended for low-/medium-level flight and long acceptable loitering times to fulfill its mission scope.

Despite the project's 2005 origination, progress on the Watchkeeper product has been relatively slow to date. A procurement order for 54 systems was unveiled in 2007 though a first flight of a test vehicle was not recorded until April 2010, pushing back the formal expected delivery date of operational-level Watchkeepers considerably (the UAV was expected to officially enter service in September of 2010). As it now stands, the system will not be made operational until sometime in late 2013 or, more likely, 2014.

The Watchkeeper test vehicle has since accrued 1,000 flight hours on over 600 test flights.©MilitaryFactory.com
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Service Year

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United Kingdom

In Active Service.

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(OPERATORS list includes past, present, and future operators when applicable)
Intelligence-Surveillance-Reconnaissance (ISR), Scout
Surveil ground targets / target areas to assess environmental threat levels, enemy strength, or enemy movement.
Unmanned Capability
Aircraft inherently designed (or later developed) with an unmanned capability to cover a variety of over-battlefield roles.

19.7 ft
(6.00 m)
34.4 ft
(10.50 m)
992 lb
(450 kg)
(Showcased structural values pertain to the base Thales Watchkeeper WK450 production variant)
Installed: 1 x Wankel rotary 52 horsepower engine driving a three-bladed propeller arranged in "pusher" configuration.
Max Speed
109 mph
(175 kph | 94 kts)
18,045 ft
(5,500 m | 3 mi)
124 mi
(200 km | 370 nm)
900 ft/min
(274 m/min)

♦ MACH Regime (Sonic)
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030

(Showcased performance specifications pertain to the base Thales Watchkeeper WK450 production variant. Performance specifications showcased above are subject to environmental factors as well as aircraft configuration. Estimates are made when Real Data not available. Compare this aircraft entry against any other in our database or View aircraft by powerplant type)
None. Payload of optics and mission-minded sensors/tracking systems.

Supported Types

(Not all ordnance types may be represented in the showcase above)
Watchkeeper WK450 - Base Series Designation

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Images Gallery

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Image of the Thales Watchkeeper WK450
Image copyright Crown Copyright / British Army MoD; Peter Russell LBIPP.

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