Introduction - AW-101 Merlin, HMA.1 Royal Navy Helicopter
The AgustaWestland AW-101 Merlin, HM1, is a medium-lift naval helicopter. It was developed as a joint venture between Westland Helicopters in England, and Agusta in Italy to develop a strong naval helicopter
to replace their fleets of Sea King NAval helcipoters. This requirment defined a modern naval multi-role helicopter with very good range, carrying weight, loiter capability, and speed. The name "Merlin" is
used for the aircraft in several nations that had adopted it, including Great Britain, Denmark and Portugal. Most aircraft are manufactured in two factories, on in Yeovil, England, and the other in Vergiate,
Italy. License building is also occurring for variants in Japan and the United States, though those are not naval applications.
Originally designated as EH101, when Westland Helicopters and Agusta merged to form AgustaWestland, the aircraft was redeignated as AW101. The first helicopter flew in 1987.
Thereafter, several pre-production aircraft were assembled into the early 1990s. Flight testing were suspended for six months following the crash of the second pre-production aircraft in January 1993. After
evaluating the crash, the aircraft was approived for further flit testing in June 1993. Ultimately nine prototypes were built and tested thoroughly.
In February 1995, Great Britain formally placed its first order for a 22 aircraft. This order was then followed by Italy ordering 16 aircraft in Inctonber of that year.
Deliveries to Great Britan began in 1997 to the Royal Air Froce and the following year to the Royal Navy. Production continued and in 1999 the aircraft went into operational service with the Royal Navy.
In addition to replacing Sikorsky S-61 Sea Kings, the AW-101 has replaced other helicopters like the Boeing Vertol CH-113 Labrador. In service it has proven its multi-role capabilities by performing anti-
submarine warfare, medium-sized transport duties, ship-based utility operations, air-sea rescue, and other, roles, including VIP transport duties and versions for commercial applications.
But the Royal Navy uses it princpally as an anti-submarine warfare helciopter having issues its first order for a total of 44 ASW aircraft. Initially its designation was HAS.1 but that has now changed to
the HM1. All aircraft for the intial order were delivered to the Royal Navy by the end of 2002, and were formed into four Fleet Air Arm squadrons: 814 NAS, 820 NAS, 824 NAS and 829 NAS, all based at RNAS
Culdrose in Cornwall.
The Royal NAvy was planning to do away with the Westland Lynx naval helicopter in favor of an all Merlin fleet, which would have mean more orders. instead, in the 2010 Defense Review, the UK government
indicted that the future naval helicopter fleet consist of the Merlin and the Wildcat, a new development of the Lynx.
In the meant time, a modernization and sustainment of the Merlin began. Thirty of the orginal aircraft were upgraded to a new Merlin HM2 standard as a result of the Merlin Capability Sustainment Programme.
The HM2 has a new mission system, a new digital cockpit, electro-optical camera, and multi-static processing for the sonar system. The HM2 performed its first ship-borne test flight in September 2012 and
achieved initial operational capability in June 2014. It is now possible that earlier airframes, which were intially not scheduled to be upgraded, may be updated nonetheless..
The Merlin HM1 and HM2 pperate from the Royal Navy's aircraft carriers, amphibious assault ships, Type 23 Duke class frigates, Type 45 Daring class Destroyers, and several Royal Fleet Auxiliary (RFA)
vessels including the Fort Victoria-class class. Forteen of the HMS aircraft will be assigned to the new Queen Elizabeth-class aircraft carrier.
Further developments of the aircraft have led to a new version that will be able to carry an airborne early warning (AEW) pod under procurement through the Crowsnest programme to replace the Sea King ASaC7.
In May 2015, The Minister of defense and Lockheed Martin UK (as the prime contractor for Crowsnest), selected Thales as the chosen bidder to provide the radar and mission system that will make up the heart
of the Crowsnest capability.
The Royal Navy, as of 2015 operates the following AW101 Merlin squadrons: 814 Naval Air Squadron, 820 Naval Air Squadron, 824 Naval Air Squadron, 829 Naval Air Squadron, 845 Naval Air Squadron, and 846 Naval
Air Squadron.
with its range, speed, capability of carrying up to four torpedos and/or other naval armamnets, and particularly ith its sensor capabilities, the AW101 Merlin is considered on of, if not the best ASW
helicopter available.
Characteristics:
Crew: 3–4
Capacity: (Merlin HM1)
- 26 troops (45 passengers) or,
- 6 tonnes of payload, or
- 16 stretchers (with sonar removed) for Merlin HM1
Capacity: (Merlin HM2)
- 30 troops (38 passengers) or,
- 5 tonnes of payload, or
- 4 stretchers (with sonar removed) for Merlin HM1
Length: 19.53 m-fuselage length (64 ft 1 in)
Rotor diameter: 18.59 m (61 ft 0 in)
Height: 6.62 m (21 ft 8¾ in)
Disc area: 271.51 m² (2,992.5 ft²)
Empty weight: 10,500 kg (23,149 lb)
Max. takeoff weight: 14,600 kg (32,188 lb)
Powerplant: 3 × Rolls-Royce Turbomeca RTM322-01 turboshafts, 1,566 kW (2,100 shp) (take-off power) each
Never exceed speed: 309 km/h (167 knots, 192 mph)
Cruise speed: 278 km/h (150 knots, 167mph)
Range: 833 km (450 nmi,[177] 517 mi)
Endurance: 5 hours
Service ceiling: 4,575 m (15,000 ft)
Armament:
- 4 × Sting Ray homing torpedoes or
- Depth charges
Navigation systems: BAE Systems LINS 300 ring laser gyro, Litton Italia LISA-4000 strapdown AHRS
Radar: Selex Galileo Blue Kestrel 5000 maritime surveillance radar
ECM: Racal Orange Reaper ESM
Sonar: Thomson Marconi Sonar AQS-903 acoustic processor, Thomson Sintra FLASH dipping sonar array, and Active/passive sonobuoys
To date, over 130 aircraft have been built for several nations including the UK, Italy, Denmark, Canada, and the US. Of these, alnost seventy are operated by the UK.