Originally two-seated and two-bladed, but changed to three-seated and three-bladed as a prototype developed in 1960.  Later, the tail boom was updated from steel tubing to aluminum semi-monocoque [Ref 316].


Data on design, manufacture and status

Design authority: R.J. Enstrom Corporation

Primary manufacturer: R.J. Enstrom Corporation

Parent type: No type defined

Aircraft status: No longer flying


Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift configuration: Single main rotor

Dedicated control device: Tail rotor

Crew required: 1

Crew seating: Side-by-side

Landing gear: Skids

Layout and Dimensions

Data on aircraft size

Overall Dimensions
Overall Height: 2.74 m 9.0 ft
Overall Length:  
Overall Width: 9.75 m 32.0 ft
Airframe Dimensions
Airframe Length: 8.53 m 28.0 ft
Airframe Width: 2.24 m 7.3 ft
Airframe Height: 2.77 m 9.1 ft
Landing Gear Dimensions
Landing Gear Base:  
Landing Gear Track: 2.21 m 7.3 ft
Cabin Dimensions
Cabin Internal Height:  
Cabin Internal Length:  
Cabin Internal Width: 1.55 m 5.1 ft

Weights and Performance

Data on aircraft weight and flight characteristics

HIGE at 2600 lb, HOGE at 2350 lb

Max Gross Weight (ground): 839 kg 1,850 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 839 kg 1,850 lb
Empty Weight: 522 kg 1,150 lb
Useful Load: 318 kg 700 lb
Empty Weight Fraction: 0.622
Climb Performance
Max Rate of Climb: 6 m/s 1,125 fpm
Hover Performance
Hover Ceiling IGE: 2,345 m 7,694 ft
Hover Ceiling OGE: 2,650 m 8,694 ft
Max Level Flight Speed: 175 km/h 95 kts
Never Exceed Speed:  
Service Ceiling: 3,536 m 11,600 ft
Range and Endurance
Max Range: 441 km 238 nm
Max Endurance: 4 hrs 4 hrs

Engine Details

Aircraft powerplant (lift and/or propulsion)

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

Number of engines: 1
Designation: Lycoming HIO-360-C1A reciprocating
Manufacturer: Lycoming Engines
Normal Ratings
Max continuous:  
Take-off / rated: 153 kW 205 hp
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: 9.75 m 32.00 ft
Direction of Rotation: Counterclockwise
Hub Type: Rigid in plane
Main Rotor Blade Characteristics
Blade Construction: Metal main rotor blades
Blade Chord: 0.240 m 0.79 ft
Blade Tip Geometry: Flat
Blade Twist:  
Number of Blades: 3
Main Rotor Derived Characteristics
Disc Area: 74.72 m² 804.3 ft²
Disc Loading: 11.23 kg/m² 2.300 lb/ft²
Solidity: 0.0470
Main Rotor Blade Derived Characteristics
Blade area per blade: 1.17 m² 12.6 ft²
Tip Speed:  

Primary Control Device

Data on primary control devices such as tail rotors

Tail Rotor Characteristics
Diameter: 1.42 m 4.66 ft
Configuration: Unblocked
Direction of Rotation: Top blade fwd
Tail Rotor Blade Characteristics
Number of Blades: 2
Blade Construction:  
Blade Chord: 0.110 m 0.36 ft
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area: 1.58 m² 17.0 ft²
Solidity: 0.0986
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade): 0.078 m² 0.84 ft²

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