Equipped with a turbocharged engine, the multirole F-28B never entered production.  The Useful Load and External Cargo Payloads are 950 lb (431 kg).  By the glossary definition of Useful Load, the calculated Empty Weight is approximately 700 kg.


Data on design, manufacture and status

Design authority: Enstrom Helicopter Corp.

Primary manufacturer: Enstrom Helicopter Corp.

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

Max Gross Weight (ground): 1,134 kg 2,500 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 1,134 kg 2,500 lb
Empty Weight: 703 kg 1,550 lb
Useful Load: 431 kg 950 lb
Empty Weight Fraction: 0.620
Climb Performance
Max Rate of Climb:  
Hover Performance
Hover Ceiling IGE:  
Hover Ceiling OGE:  
Max Level Flight Speed:  
Never Exceed Speed:  
Service Ceiling:  
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: Lycoming TIO-360-B1A turbine
Manufacturer: Lycoming Engines
Normal Ratings
Max continuous:  
Take-off / rated: 168 kW 225 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: 15.18 kg/m² 3.108 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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