Hawker Siddeley
Nimrod

Long-range ASW and maritime patrol aircraft developed from the Comet airliner.
Hawker Siddeley Nimrod HS801 XV148 First Flight Hawker Siddeley HS801 Nimrod XV148 showing the passenger windows retained by the two prototypes.
 
The Hawker Siddeley Aircraft Nimrod maritime patrol aircraft was an extensive modification of the De Havilland 106 Comet 4. On 4 June 1964, the British Government issued Air Staff Requirement 381, which sought a replacement for the aging Avro Shackleton maritime patrol aircraft which was fast approaching its fatigue life limit.
 
The Nimrod was originally designed by Hawker Siddeley with further development by British Aerospace and BAE Systems
 

Hawker Siddeley 801


The first two prototypes, designated Hawker Siddeley HS801, were modifications of unsold De Havilland 106 Comet 4C airframes, retained at the Hawker Siddeley Chester factory. These aircraft (serials XV147 and XV148) can generally be distinguished by their retention of the original airliner passenger windows. The first Hawker Siddeley HS801 prototype flew on 24th May 1967.
 
Compared with the DH Comet, the HS801 Nimrod was fitted with Rolls-Royce Spey engines, featuring a new lower fuselage, containing a forward-looking search radar and a lengthy sonobuoy and weapons bay. A magnetic anomaly detector (MAD) sting was mounted in the extreme tail, with electronic surveillance sensors mounted in a fairing at the top of the tail fin.
 
The HS801 Nimrod was designed to replace the Avro Shackleton in its maritime patrol and anti-submarine operations, with secondary roles including anti-ship operations and long-range search and rescue support.
 
HS801 Nimrod MR1: The initial service variant was the HS801 Nimrod MR.1, of which 46 were ordered during 1967, with the first service aircraft (XV230) being delivered in October 1969. Compared with the prototypes, this production aircraft featured a reduced number of cabin windows.
 
Hawker Siddeley Nimrod MR1 RAF XV236 25-07-1979 XV236 is a production Nimrod MR1 photographed in July 1979.
 
HS801 Nimrod R1: Three HS801 Nimrod MR1 aircraft were adapted for the signals intelligence (SIGINT) role and designated HS801 Nimrod R1. The HS801 R1 was visually distinguished from the HS801 Nimrod MR2 by the lack of the rear MAD boom, together with the introduction of a number of additional external aerials, mounted on the upper and lower fuselage. Additional internal rotating dish aerials were fitted in the weapons bay, within the rear fuselage and in the front of the wing-mounted pinion tanks.  
 
It had a flight crew of four (two pilots, a flight engineer and one navigator) and up to 25 crew operating the mission equipment.
 
Hawker Siddeley Nimrod R1 XV249 29-07-2011 HS Nimrod R.1 signals intelligence aircraft XV249 photographed on 29th July 2011.
 
Following the loss of one aircraft in May 1995, a replacement aircraft was generated by the conversion of HS801 Nimrod MR.2 (XV249). This HS801 Nimrod R1 was flown by 51 Sqn RAF, intitially from RAF Wyton but later from RAF Waddington. The last flight of the type was on 28th June 2011 and the aircraft (XV 249) is now preserved at the RAF Museum Cosford, West Midlands.
 
HS801 Nimrod MR2: From 1975, 35 HS801 Nimrod MR1 aircraft were upgraded to HS801 Nimrod MR2 standard. This upgrade included extensive modernisation of the aircraft's electronic mission equipment. It also added the new EMI Searchwater radar, a new acoustic processor (GEC-Marconi AQS-901), a new mission data recorder and new Electronic Support Measures equipment (Yellow Gate).
 
The HS801 Nimrod MR2 carried a flight crew of two pilots, one flight engineer and two navigators (one tactical navigator and a routine navigator), with a mission crew comprising of one Air Electronics Officer (AEO), the sonobuoy sensor team of two Weapon System Operators and finally four EW System Operators to manage passive and active electronic warfare systems.
 
Hawker Siddeley Nimrod MR2P RAF XV254 20-01-1983 Sidewinders HS Nimrod MR2P XV254 photographed in January 1983 with underwing Sidewinder fit.
 
The Falklands War resulted in the provision of in-flight refuelling equipment and so am HS801 was quickly adapted as the HS801 Nimrod MR2P. The aircraft was also equipped with the ability to carry the AIM-9 Sidewinder missile for self-defence. Further equipment changes were introduced to support operations in the Gulf theatre.
 
The HS801 Nimrod MR2 fleet was based at RAF Kinloss in Scotland (with 120, 201 and 206 Squadrons), and RAF St Mawgan in Cornwall (with 42 and 38(R) Squadrons). The HS801 Nimrod MR2 aircraft was withdrawn at the end of March 2010 and with it 42 Squadron was disbanded and amalgamated with 38(R) Squadron.
 
The HS801 Nimrod MR2 aircraft was fully withdrawn a year earlier than planned (for financial reasons) and the last official flight (XV229) took place on 26th May 2010, flying from RAF Kinloss to Kent International Airport at Manston whereafter it was used as an evacuation training airframe at the Ministry of Defence Fire Training and Development Centre.
 

British Aerospace Nimrod AEW3


 In the mid-1970s, a modified HS801 Nimrod was proposed for the Airborne Early Warning (AEW) mission, as a replacement for the long-serving Avro Shackleton AEW.2.
 
Eleven existing HS801 Nimrod airframes were to be converted by British Aerospace at Woodford  predominately to house the GEC Marconi radars, accommodated in bulbous nose and tail radomes. The British Aerospace Nimrod AEW3 project suffered numerous delays, predominantly due to technical problems with the integration of the mission equipment. This resulted in the cancellation of the programme in December 1986.
 
Hawker Siddeley Nimrod AEW3 RAF XV263 03-09-1983 Hawker Siddeley Nimrod AEW.3 XV263 showing its front and rear search radars.
 

BAE Systems Nimrod MRA4


The BAE Systems Nimrod MRA4 was intended to replace the capability provided by the HS801 MR2.
 
Essentially it was a new aircraft, with the more efficient Rolls-Royce BR710 turbofan engines, installed in a new larger wing, with a fully refurbished fuselage. The first prototype of the BAE Systems Nimrod MRA4 (ZJ516) flew for the first time on 26th August 2004.
 
Hawker Siddeley Nimrod_MRA4 The extensively modified Nimrod MRA.4 was cancelled due to cost and timescale issues.
 
Significant delays and cost overruns were encountered and the BAE Systems Nimrod MRA4 programme was dramatically reduced in scope.
 
Following the latest Strategic Defence and Security Review (SDSR), the 9 aircraft program was cancelled on 19th October 2010, resulting in some significant loss of operational capability. At the time of cancellation, three development aircraft and two production aircraft had been flown.
 
The purchase of nine Boeing P-8A Poseidon aircraft is intended to restore the UK’s long-range maritime patrol capability.
 

Variants & Numbers


HS801              
2 Prototypes (XV147, XV148) modified Comet 4C airframes
HS801 MR.1
46 production aircraft with primary ASW role
HS801 R.1
4 Signals Intelligence aircraft (3 converted from MR.1, 1 converted from MR.2)
HS801 MR.2
35 conversions from MR.1 with enhanced mission system capability
BAe AEW.3
11 AEW variants (planned) with front and rear radomes; converted from MR.1 aircraft – programme cancelled
BAE MRA.4
5 aircraft converted from MR.2 of 21 planned – programme cancelled
Totals
51 aircraft: 2 prototypes and 49 production aircraft

 

Specification (Nimrod MR.2)


 Powerplants
Four 12,160 lbst Rolls-Royce Spey turbofans                                                           
Span
114 ft 10 in
Maximum Weight
192,000 lb
Capacity & Armament
Up to 13 crew. Armament varies with role: weapons bay capacity 20,000 lb plus two underwing stations; mix of sonobuoys, torpedoes, depth charges, anti-ship missiles and naval mines
Maximum Speed
580 mph
Cruise speed
490 mph
Range
5,200 - 5,750 miles

 

Survivors


HS801 Nimrod MR2 (XV226)
Bruntingthorpe, Lincolnshire 
HS801 Nimrod MR2 (XV231)
Manchester Airport Visitor Park 
HS801 Nimrod MR2 XV232
Coventry Airport
HS801 Nimrod MR2 XV244
Morayvia Aviation Charity, North Rd, Kinloss, Forres, Scotland
HS801 Nimrod MR2 XV250
Yorkshire Air Museum, Elvington 
HS801 Nimrod MR2 XV255
City of Norwich Air Museum   
HS801 Nimrod MR2 XV249
Nimrod R1 RAF Museum, Cosford
HS801 Nimrod
MR2 XW664
East Midlands Aeropark, Castle Donington 

 

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