Reading level:

Hawker Siddeley Nimrod MR.2

Hawker Siddeley · Maritime Patrol / ASW / Anti-Submarine / Maritime Patrol · UK · Early Jet (1946–1969)

Hawker Siddeley Nimrod MR.2 — Maritime Patrol / ASW / Anti-Submarine / Maritime Patrol
Open in interactive gallery →

The Hawker Siddeley Nimrod (later British Aerospace, then BAE Systems Nimrod) was a British four-engine maritime patrol and signals-intelligence aircraft developed by Hawker Siddeley Aviation as a militarised derivative of the de Havilland Comet 4C airliner. It entered Royal Air Force service in 1969 as the Nimrod MR.1 and supplied Britain's principal long-range MPA and SIGINT fleet for more than four decades. Three variants reached or approached service: the Nimrod MR.1 / MR.2 for sea patrol and ASW, the Nimrod R.1 for signals and electronic intelligence, and the cancelled Nimrod MRA4. The MR.2 was withdrawn in 2010 alongside the MRA4 cancellation; the R.1 followed in 2011, replaced by the RC-135W Rivet Joint.

The MR.2 / R.1 measured 126 ft (38.6 m) long with a 115-ft (35.0 m) wingspan. Empty weight was around 86,000 lb and maximum take-off weight 192,000 lb. Four Rolls-Royce Spey Mk 250 turbofans rated at 12,140 lbf each replaced the Avon turbojets of the Comet 4C, delivering far greater thrust. Top speed reached 575 mph (Mach 0.86), service ceiling 42,000 ft, and unrefuelled range 5,755 nmi with full fuel. Typical mission endurance ran beyond 12 hours and longer with air-to-air refuelling. A 12-13 person crew flew the aircraft, comprising pilots, a navigator, weapons-systems officer, sonar operators, and additional mission-system specialists.

Anti-submarine warfare was the MR.2's central task: detecting, tracking, and where directed attacking enemy submarines using a deep sonobuoy fit, the AN/ASQ-10 magnetic anomaly detector, acoustic processors, and Mk-44 / Mk-46 lightweight torpedoes. Secondary roles covered surface search and surveillance and long-range search and rescue, with Nimrod crews flying hundreds of SAR sorties across the type's career. The R.1 was reworked for SIGINT and ELINT collection in place of ASW, and was flown by 51 Squadron — the RAF's only dedicated SIGINT aircraft unit.

RAF Nimrod operations spanned continuous Cold War ocean patrol over the Atlantic against Soviet Northern Fleet submarines, Operation Granby (Gulf War 1991), Operation Allied Force (Yugoslavia 1999), Operation Veritas (Afghanistan 2001-2009), and Operation Telic (Iraq 2003-2009). On 2 September 2006, Nimrod XV230 was lost over Afghanistan, killing all 14 personnel aboard — the worst RAF loss since the Falklands War. The cause was an airframe-fuel-system fire following air-to-air refuelling, a finding that weighed heavily on the subsequent retirement decisions. The MR.2 stood down in October 2010, the R.1 in June 2011. BAE Systems' planned MRA4 successor was cancelled the same month after £3.7B of programme spending without delivering a frontline aircraft. Production totalled around 49 MR.1 / MR.2, 5 R.1, and 9 partially completed MRA4 airframes scrapped before service entry. The retirement opened a UK sea-patrol gap that lasted until P-8 Poseidon deliveries began in 2020, with 9 ordered.

For Kids — a shorter, friendlier version

The Hawker Siddeley Nimrod was a British maritime patrol jet built from the de Havilland Comet airliner. The Nimrod first flew in 1967 and entered Royal Air Force service in 1969. It served for over 40 years, retiring in 2011. About 49 Nimrod MR-2 sub-hunters and 5 Nimrod R-1 spy planes were built.

The Nimrod is 126 feet long with a 115-foot wingspan, longer than a Boeing 737. Four Rolls-Royce Spey jet engines each make 12,140 pounds of thrust. Top speed is 575 mph, faster than most race cars. The Nimrod could stay airborne for over 12 hours, much longer with mid-air refueling.

The Nimrod was Britain's main sub-hunter for decades. It dropped sonar buoys to listen for submarines and could attack them with torpedoes. The Nimrod also watched the seas for hostile ships and gathered electronic intelligence. Its body had a long bay underneath for sonar buoys, depth charges, and torpedoes.

A new version called the Nimrod MRA4 was being built in the 2000s. After spending almost 4 billion pounds, Britain cancelled the program in 2010 due to delays and cost overruns. The Nimrod was replaced by the American Boeing P-8 Poseidon from 2020 onwards. The R-1 spy version was replaced by RC-135 Rivet Joints in 2011.

Fun Facts

  • The Nimrod was built from the de Havilland Comet airliner.
  • The Nimrod is 126 feet long, longer than a Boeing 737.
  • Top speed is 575 mph, faster than most race cars.
  • About 49 Nimrod MR-2 sub-hunters and 5 spy R-1s were built.
  • The Nimrod could stay airborne for over 12 hours.
  • A new Nimrod MRA4 was cancelled after Britain spent almost 4 billion pounds.
  • The Nimrod was replaced by the Boeing P-8 Poseidon.

Kids’ Questions

Why build it from a Comet?

The de Havilland Comet was the world's first jet airliner, from 1949. By the late 1960s the Comet was outdated as an airliner, but the body was the right size for a maritime patrol plane. Britain saved time and money by using the Comet design as a starting point. The Nimrod ended up with 4 jet engines, like the Comet, but with stronger wings and special gear inside.

What did it do?

The Nimrod hunted Soviet submarines during the Cold War. It dropped sonar buoys, listened for submarine sounds, and tracked them across the seas. Some Nimrods (the R-1 version) listened to enemy radio and radar signals, gathering electronic intelligence. The MR-2 also helped with search and rescue, looking for ships and boats in trouble.

Why was the new Nimrod cancelled?

The Nimrod MRA4 was a major upgrade with new engines, electronics, and wings. The program ran years late and cost much more than expected. After spending almost 4 billion pounds, Britain decided the MRA4 was no longer worth it and cancelled the program in 2010. The Nimrod fleet retired in 2010 to 2011, and Britain bought American P-8 Poseidons to fill the gap.

Variants

Nimrod MR.1 (initial, 1969)
Original 1969 production variant with Spey Mk 250 engines and first-generation mission systems. Around 46 delivered. Carried RAF ocean patrol through to the 1979 MR.2 upgrade.
Nimrod MR.2 (mid-life upgrade, 1979-2010)
Upgraded variant from 1979 with new acoustic processors, expanded sonobuoy capacity, AGM-84 Harpoon anti-ship missile compatibility from Operation Granby onwards, and AIM-9 Sidewinder integration after a post-2005 update. Around 49 MR.1 airframes were brought up to MR.2 standard. Retired in late 2010.
Nimrod R.1 (SIGINT variant)
Signals-intelligence variant, around 5 delivered. Mission systems were rebuilt for SIGINT and ELINT collection. Flown by 51 Squadron at RAF Waddington. Retired June 2011 and replaced by RC-135W Rivet Joint.
Nimrod AEW.3 (cancelled AEW variant, 1980s)
Failed 1980s effort to develop a Nimrod-based airborne early warning aircraft. Cancelled in 1986 after heavy cost overruns; the RAF instead procured the E-3D Sentry on a Boeing 707-derived airframe. Listed for context — it foreshadowed the difficulties of further Nimrod-airframe modifications.
Nimrod MRA4 (cancelled successor, 2010)
Heavily redesigned BAE Systems successor. Cancelled October 2010 after £3.7B of programme spending. Around 9 partial MRA4 airframes had been built but never entered service. The cancellation left a UK maritime-patrol gap until P-8 Poseidon deliveries from 2020.
P-8A Poseidon (eventual successor)
Boeing P-8A Poseidon, the eventual UK maritime-patrol replacement. 9 P-8A ordered with deliveries from 2020, operating from RAF Lossiemouth. See the separate P-8A entry.

Notable Operators

Royal Air Force (former)
Sole operator. Around 49 Nimrod MR.1 / MR.2 served 1969-2010. Operating units included 42 Squadron, 51 Squadron (R.1), 120 Squadron, 201 Squadron, 203 Squadron, and 206 Squadron. Main bases were RAF Kinloss in Scotland for the MR fleet and RAF Waddington in Lincolnshire for the R.1. Final retirement: October 2010 (MR.2) / June 2011 (R.1).
Foreign / export
None — the Nimrod was flown only by the Royal Air Force. Specialised mission systems and UK policy on exporting maritime-patrol technology closed off foreign sales.
Preservation / museums
Around 6 surviving Nimrod airframes are preserved at UK aviation museums, including the Royal Air Force Museum Cosford in Shropshire, the Yorkshire Air Museum at Elvington, and Bruntingthorpe Aerodrome in Leicestershire.

Frequently Asked Questions

What is Nimrod's relationship to de Havilland Comet?

Direct lineage. The Nimrod is a militarised derivative of the de Havilland Comet 4C airliner, taking the Comet 4C's basic airframe and adapting it for maritime patrol and SIGINT. Key changes: a reworked fuselage extended for additional mission systems and crew; new Rolls-Royce Spey Mk 250 turbofans replacing the Comet's Rolls-Royce Avon turbojets; integration of sonobuoys, sonar, anti-shipping weapons and other mission gear; and a range of further military modifications. The Comet 4C was retired from commercial service by the 1970s, but its Nimrod descendant continued flying until 2011 — one of the longest commercial-to-military airframe transitions in UK aviation history.

What happened with the Nimrod MRA4 cancellation?

The MRA4 was cancelled in October 2010 after £3.7B of programme spending. BAE Systems' planned MR.2 successor brought new wings, new engines, and a new cockpit and mission system. The programme began in 1996 with delivery planned for 2003 but ran into repeated cost overruns and schedule delays through the 2000s. The 2010 UK Strategic Defence and Security Review cancelled it, citing the £3.7B already spent without a flying aircraft and the projected cost to complete. Around 9 MRA4 airframes had been partially built. The decision opened a UK maritime patrol gap until P-8 Poseidon arrived from 2020 and stands as one of the most damaging UK defence-procurement failures of the post-Cold War era.

What was the XV230 accident?

On 2 September 2006, Nimrod MR.2 XV230 crashed in Afghanistan following an airborne fire, killing all 14 personnel aboard — 12 Royal Air Force, 1 Royal Marine, and 1 Army. The fire was traced to fuel leaking from a fuel coupling onto a hot engine bay during air-to-air refuelling, a long-known weakness in Nimrod fuel-system design. It was the worst RAF loss since the 1982 Falklands War. The Haddon-Cave Inquiry of 2009 found fundamental airworthiness failures in fleet management, and its findings weighed directly on the October 2010 MR.2 retirement decision. The XV230 loss remains one of the most damaging UK military aviation disasters and reshaped UK military airworthiness policy.

Why is the U.K. operating P-8 Poseidon instead?

Because the MRA4 cancellation left a maritime patrol gap. After October 2010 the UK flew no maritime patrol aircraft for 9 years until P-8 Poseidon arrivals in 2020. The 2010 SDSR named the P-8 as the long-term replacement. 9 P-8A were ordered with deliveries running 2020-2024 and the fleet operates from RAF Lossiemouth. The P-8 is shared with the US Navy and allied operators and is built on a Boeing 737-derivative airframe. The combined Nimrod retirement, MRA4 cancellation, and P-8 procurement produced a 9-year gap from 2010 to 2020 and saw the UK adopt a foreign design rather than an indigenous one — an outcome many UK defence analysts have criticised.

Where can I see a Nimrod today?

Around 6 surviving Nimrod airframes are on display at UK aviation museums. Highlights include the Royal Air Force Museum Cosford in Shropshire with a full Nimrod exhibit, the Yorkshire Air Museum at Elvington with a Nimrod MR.2, and Bruntingthorpe Aerodrome in Leicestershire where airframes still perform taxi-runs at public events. Imperial War Museum Duxford also holds an example. The aircraft is large and imposing in static display, which makes it a memorable museum exhibit. Several MRA4 airframes were scrapped after the October 2010 cancellation, while others have been preserved.

Sources

See Also