Agusta Westland AW101 Merlin

The three-engine helicopter built for maritime dominance

Italian Navy AW-101 Marina Militare © CHEN PENG

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Overview

AgustaWestland United Kingdom ICAO: EH10 2000–Present Active $25 million

The AgustaWestland AW101 Merlin was developed as a next-generation medium-lift helicopter capable of operating in demanding naval and military environments. Designed through a joint British-Italian program, it combined range, payload, and advanced mission systems to replace earlier maritime helicopters. Its three-engine configuration and modern avionics made it one of the most capable rotorcraft in its class.

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Specifications

Units
Engine
3 × Rolls-Royce Turbomeca RTM322-01
Engine type
Turboshaft
Power
3 × 2,100 shp · 1,566 kW
Avionics
NVG compatible glass cockpit, Smiths Industries OMI 20 SEP
Wing tips
No winglets
Seats
45
Crew
—
Cabin width
7 ft 10 in  ·  2.39 m
Cabin height
6 ft 3 in  ·  1.90 m
Cabin length
21 ft 4 in  ·  6.50 m
Exterior length
74 ft 10 in  ·  22.80 m
Tail height
21 ft 10 in  ·  6.65 m
Fuselage diameter
9 ft 2 in  ·  2.80 m
Wing span
61 ft 0 in  ·  18.60 m
Baggage volume
1,095 ft³  ·  31.0 m³
Gross weight
—
Empty weight
—
Max takeoff weight
34,400 lb  ·  15,600 kg
Max landing weight
—
Max payload
12,000 lb  ·  5,450 kg
Fuel capacity
1,100 gal · 4,200 L · 3,300 kg (Jet A)
Max cruise speed
150 kt  ·  173 mph  ·  278 km/h
Maximum speed
—
Cruise speed
—
Approach speed
—
Range
540 nm  ·  620 mi  ·  1,000 km
Fuel burn
0.45 nm/gal  ·  0.22 km/L
Ceiling
15,000 ft  ·  4,600 m
Rate of climb
2,000 ft/min  ·  10 m/s
Takeoff distance
—
Landing distance
—
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AgustaWestland AW101 Merlin HM1

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Operational Context

AgustaWestland AW101 Merlin — modern multi-mission capability at sea and ashore

The AW101 Merlin originated in the 1980s as the EH101, a collaborative effort between Westland Helicopters in the United Kingdom and Agusta in Italy. The helicopter first flew in 1987 and entered service in the late 1990s. It was developed to replace aging anti-submarine warfare helicopters and provide enhanced performance, survivability, and endurance.

One of the AW101’s distinguishing features is its three-engine layout, which improves redundancy and safety during overwater operations. Powered by variants of the Rolls-Royce Turbomeca RTM322 or General Electric CT7 engines, the helicopter offers strong lift capability and extended range compared to many twin-engine competitors. Its large cabin allows it to carry troops, equipment, or mission-specific systems depending on configuration.

The Merlin has been deployed in anti-submarine warfare, anti-surface warfare, search and rescue, troop transport, and airborne early warning roles. Naval variants operate from aircraft carriers and frigates, while transport versions support battlefield mobility and special operations missions. The aircraft incorporates advanced avionics, sonar systems, radar, and defensive aids tailored to its mission profile.

The AW101 has been adopted by several countries for both military and government transport roles, including head-of-state missions. Its combination of endurance, payload capacity, and mission flexibility ensures its continued relevance in maritime and expeditionary operations worldwide.