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Scale 1:20   Fuselage 15.3"   Rotor 16.5"
Length over all (rotor turning) 19.3"

Photography by Action Asia Photo
© 2002-8 Action Asia Photo - All Rights Reserved
www.actionasiaphoto.com


The powerful "Night Sun" searchlight moves



Interior modeling reveals the intake mechanism

The tail thruster rotates

The MD-520N is an agile, lightweight, all-purpose helicopter built with advanced technology. The turbine powered helicopter features the NOTAR anti-torque system which eliminates the tail rotor and so gives superior safety and quieter flying. Because there is no rotor, accidents and mishaps caused by an exposed tail rotor striking objects in flight or ground incidents with people are eliminated.

The MD-520N is a fast helicopter and, because of the NOTAR system, it flies well in quartering tail winds and can also fly sideways or backwards at over 30 knots. Additionally, it flies about 50% quieter than conventional aircraft which makes it "neighborhood friendly" while also allowing it to be more effective for surveillance.

The MD-520N is constructed primarily of aluminum alloy materials while the NOTAR system is made primarily out of graphite composites. The egg-shaped crashworthy airframe provides clean aerodynamic lines and is energy absorbing along with the nitrogen charged landing gear dampers - while a rigid, three-dimensional roll bar further increases crew safety.

The MD-520N has a high "payload-to-empty-weight ratio" and has been designed to permit a variety of rapid configuration options.  The helicopter is especially useful for airborne law enforcement, Search&Rescue, aerial survey, photographic missions, fire fighting and forestry applications.

Crew:           Pilot plus space for 6 more
Fuselage:     25.5 ft
Rotor:          27.4 ft
L.O.A.          32.1 ft
Engine:        Allison 250-C20RS gas turbine with 450 hp
Endurance:  2.3 hours
Speed:         175 mph max; Cruise 147 mph
Range:         240 miles
Hover:         11,200 feet (in ground effect)

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Numerous antennae crowd the underside

NOTAR® ANTI-TORQUE SYSTEM

The NOTAR system is an anti-torque system made up of an enclosed variable pitch fan driven by the main rotor transmission; a tailboom with circulation control slots; a direct jet thruster; and a horizontal stabilizer with two vertical stabilators. In hover flight, the circulation control tail boom provides the majority of the required main rotor anti-torque. This is accomplished by two slots along the tailboom that energize the downwash flow from the main rotor. The result is lift in a horizontal direction that replaces the push of a conventional tail rotor. The direct jet thruster provides the remaining anti-torque and maneuverability for yaw control and directional changes. In forward flight, the vertical stabilators in conjunction with the direct-jet thruster provide the required anti-torque and directional control.