Vertipedia - AgustaWestland Merlin HC.4

Utility version for the RN (Royal Navy), now part of the Commando Helicopter Force. Upgraded from the HC.3/3A with folding tail, folding rotor blades. The later aircraft also have a digital cockpit common to the Merlin HM.2

Overview

Data on design, manufacture and status

Latest or last design authority: Leonardo S.p.A, Helicopter Division
Originally designed by AgustaWestland N.V.

Latest or last primary manufacturer: Leonardo S.p.A, Helicopter Division
Originally manufactured by AgustaWestland N.V.

Parent type: AgustaWestland AW101/EH101

Aircraft status: Operational

Configuration

Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift devices: 1 Single main rotor

Dedicated control device: 1 Tail rotor

Crew required: 2 in Side-by-side arrangement

Landing gear: Wheels (all retractable)

Key Characteristics

Data on key physical features

Aircraft Details

Data on aircraft configuration, weights, flight performance and equipment

Layout and Dimensions

Weights and Performance

Engine Details

Primary Lift Device

Primary Control Device

Overall Dimensions
Overall Height:	6.66 m	21.9 ft
Overall Length:	22.83 m	74.9 ft
Overall Width:	18.59 m	61.0 ft

Airframe Dimensions
Airframe Length:	19.30 m	63.3 ft
Airframe Width:	5.06 m	16.6 ft
Airframe Height:	5.09 m	16.7 ft

Landing Gear Dimensions
Landing Gear Base:	6.99 m	22.9 ft
Landing Gear Track:	3.82 m	12.5 ft

Cabin Dimensions
Cabin Internal Height:	1.83 m	6.0 ft
Cabin Internal Length:	6.50 m	21.3 ft
Cabin Internal Width:	2.49 m	8.2 ft

Weights
Max Gross Weight (ground):	14,600 kg	32,187 lb
Max Gross Weight (airborne):
Max Take-off Weight:	14,600 kg	32,187 lb
Empty Weight:

Climb Performance
Max Rate of Climb:

Hover Performance
Hover Ceiling IGE:	3,307 m	10,850 ft
Hover Ceiling OGE:

Limitations
Max Level Flight Speed:	278 km/h	150 kts
Never Exceed Speed:	309 km/h	167 kts
Service Ceiling:

Range and Endurance
Max Range:	1,360 km	734 nm
Max Endurance:	7 hrs

Provided powerplant data is for uninstalled, sea level, static operations.

Powerplant
Number of engines:	3
Designation:	Turbomeca RTM 322 02/8 turbine
Manufacturer:	Turbomeca

Normal Ratings
Max continuous:	1406 kW	1885 hp
Take-off / rated:	1689 kW	2264 hp
Intermediate:
Maximum:

OEI Ratings
OEI contingency:
OEI continuous:	1689 kW	2264 hp
OEI 30-second:	1864 kW	2499 hp
OEI intermediate:

Main Rotor Characteristics
Diameter:	18.59 m	61.00 ft
RPM:
Direction of Rotation:	Counterclockwise
Hub Type:	Fully articulated with elastomeric bearings

Main Rotor Blade Characteristics
Blade Construction:	Glass/carbon with metallic erosion shields
Blade Chord:	0.680 m	2.23 ft
Blade Tip Geometry:	BERP III with anhedral
Blade Twist:
Number of Blades:	5

Main Rotor Derived Characteristics
Disc Area:	271.51 m²	2922.6 ft²
Disc Loading:	53.77 kg/m²	11.014 lb/ft²
Solidity:	0.1164

Main Rotor Blade Derived Characteristics
Blade area per blade:	6.32 m²	68.0 ft²
Tip Speed:

Tail Rotor Characteristics
Diameter:	4.10 m	13.45 ft
Configuration:	Pusher
Direction of Rotation:	Top blade aft
RPM:

Tail Rotor Blade Characteristics
Number of Blades:	4
Blade Construction:	Composite
Blade Chord:
Blade Twist:

Tail Rotor Derived Characteristics
Disc Area:	13.20 m²	142.1 ft²
Solidity:

Tail Rotor Blade Derived Characteristics
Tip Speed:
Blade Area (per blade):

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Related Public Resources

Resources related to the Merlin HC.4, provided by public sources across the internet.

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Images

Overview

Attribution

Main Rotor Diameter:	18.59 m	61.00 ft
Max Gross Weight (ground):	14,600 kg	32,187 lb

Number of engines:	3 Turbines
Max Level Flight Speed:	278 km/h	150 kts
Max Range:	1,360 km	734 nm
Max Endurance:	7 hrs	7 hrs