The AC311, also known as the Z11M-100 as a variant of the Chinese military Z-11, is a 2-ton light civil helicopter developed by AVICOPTER; certificated by CAAC in June 2012 and passed AEG evaluation; its maiden flight was in November 2010 and initial deliveries were in June 2013.

The AC311 is a single rotor general layout light helicopter consisting of a 2 pilot+4 pax / 1 pilot+5 pax cabin and twin-skid landing gear.  Either HONEYWELL LTS101-700D-2 or TURBOMECA Arriel 2B1A  (with the locally produced designation of WZ8D) powerplants are used.

Maximum internal and external payloads are 900 kg and 960 kg, respectively.  The maximum fuel weight is 423 kg.


Data on design, manufacture and status

Design authority: AVICOPTER PLC

Primary manufacturer: AVICOPTER PLC

Parent type: No type defined

Aircraft status: Operational


Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift configuration: Single main rotor

Dedicated control device: Tail rotor

Crew required: 1-2

Crew seating: Side-by-side

Landing gear: Skids

Layout and Dimensions

Data on aircraft size

*Airframe length: Measured from the front of the frame to the end of the tail boom, excluding rotors and rudders. **Cabin Dimensions: External measurements - Length measured from front of airframe to the start of the tail boom.

Overall Dimensions
Overall Height: 3.42 m 11.2 ft
Overall Length: 13.08 m 42.9 ft
Overall Width: 10.69 m 35.1 ft
Airframe Dimensions
Airframe Length: 10.69 m 35.1 ft
Airframe Width: 2.53 m 8.3 ft
Airframe Height: 3.42 m 11.2 ft
Landing Gear Dimensions
Landing Gear Base:  
Landing Gear Track: 2.22 m 7.3 ft
Cabin Dimensions
Cabin Internal Height:  
Cabin Internal Length: 4.94 m 16.2 ft
Cabin Internal Width: 1.83 m 6.0 ft

Weights and Performance

Data on aircraft weight and flight characteristics

Max Cruise Speed: 236 km/h; Max endurance with 20 min reserve: 3.7 h; Max range with 20 min reserve: 590.0 km

Max Gross Weight (ground): 2,200 kg 4,850 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 2,200 kg 4,850 lb
Empty Weight: 1,300 kg 2,866 lb
Useful Load: 900 kg 1,984 lb
Empty Weight Fraction: 0.591
Climb Performance
Max Rate of Climb: 8 m/s 1,575 fpm
Hover Performance
Hover Ceiling IGE: 2,950 m 9,678 ft
Hover Ceiling OGE: 2,250 m 7,382 ft
Max Level Flight Speed:  
Never Exceed Speed:  
Service Ceiling: 4,700 m 15,420 ft
Range and Endurance
Max Range:  
Max Endurance:  

Engine Details

Aircraft powerplant (lift and/or propulsion)

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

Number of engines: 1
Designation: Liming WZ8D turbine
Manufacturer: Liming Aircraft Engine Company
Normal Ratings
Max continuous:  
Take-off / rated:  
OEI Ratings
OEI contingency:  
OEI continuous:  
OEI 30-second:  
OEI intermediate:  

Primary Lift Device

Data on primary lift devices such as main rotors

Main Rotor Characteristics
Diameter: 10.69 m 35.07 ft
Direction of Rotation: Unknown
Hub Type:
Main Rotor Blade Characteristics
Blade Construction:
Blade Chord:  
Blade Tip Geometry:
Blade Twist:  
Number of Blades: 3
Main Rotor Derived Characteristics
Disc Area: 89.75 m² 966.1 ft²
Disc Loading: 24.51 kg/m² 5.020 lb/ft²
Main Rotor Blade Derived Characteristics
Blade area per blade:  
Tip Speed:  

Primary Control Device

Data on primary control devices such as tail rotors

Tail Rotor Characteristics
Diameter: 1.86 m 6.10 ft
Configuration: Unknown
Direction of Rotation: Unknown
Tail Rotor Blade Characteristics
Number of Blades: 2
Blade Construction:  
Blade Chord:  
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area: 2.72 m² 29.2 ft²
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade):  

Related VFS Resources

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Related Public Resources

Resources related to the AC311 Air Sprite, provided by public sources across the internet.