MD 520N

The NOTAR helicopter built for safety and reduced noise.

Overview

MD Helicopters United States ICAO: MD52 1991–Present Active $2.6 million

The MD 520N is a derivative of the MD 500 series incorporating the NOTAR anti-torque system. Introduced in the early 1990s, it eliminates the conventional tail rotor. The aircraft is widely used in urban environments.

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Specifications

Units
Engine
1 × Allison 250-C20R Turboshaft
Engine type
Turboshaft
Power
420 shp · 313 kW
Avionics
Garmin Avionics
Wing tips
No winglets
Seats
5
Crew
—
Cabin width
4 ft 7 in  ·  1.40 m
Cabin height
4 ft 3 in  ·  1.30 m
Cabin length
6 ft 0 in  ·  1.83 m
Exterior length
33 ft 2 in  ·  10.10 m
Tail height
8 ft 10 in  ·  2.70 m
Fuselage diameter
5 ft 3 in  ·  1.60 m
Wing span
27 ft 4 in  ·  8.33 m
Baggage volume
49 ft³  ·  1.4 m³
Gross weight
—
Empty weight
—
Max takeoff weight
3,850 lb  ·  1,750 kg
Max landing weight
—
Max payload
1,750 lb  ·  800 kg
Fuel capacity
60 gal · 200 L · 200 kg (Jet A)
Max cruise speed
123 kt  ·  142 mph  ·  228 km/h
Maximum speed
—
Cruise speed
—
Approach speed
—
Range
210 nm  ·  240 mi  ·  390 km
Fuel burn
4.16 nm/gal  ·  2.04 km/L
Ceiling
20,000 ft  ·  6,100 m
Rate of climb
1,850 ft/min  ·  9 m/s
Takeoff distance
—
Landing distance
—
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MD520n RA-1038G.

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Operational Context

MD 520N — light NOTAR helicopter

The 520N first flew in 1989 and entered service in 1991. It replaces the tail rotor with a fan-driven system using directed airflow. The design reduces noise and external hazards.

A single turboshaft engine producing approximately 450 shaft horsepower powers the helicopter. Cruise speed approaches 130 knots (241 km/h). Maximum takeoff weight exceeds 3,100 pounds (1,406 kg).

The 520N is popular with law enforcement and utility operators. Its innovative anti-torque system distinguishes it from conventional helicopters. The aircraft remains in specialized service roles.