Developed in 1947 for the USAF.  Capable of operation with a single engine active.


Data on design, manufacture and status

Design authority: Kellett Aircraft Corporation

Primary manufacturer: Kellett Aircraft Corporation

Parent type: No type defined

Aircraft status: No longer flying


Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift configuration: Synchropter (x2)

Crew required: 1-2

Crew seating: Side-by-side

Landing gear: Wheels (non-retractable)

Layout and Dimensions

Data on aircraft size

Overall Dimensions
Overall Height:  
Overall Length: 19.81 m 65.0 ft
Overall Width:  
Airframe Dimensions
Airframe Length: 8.74 m 28.7 ft
Airframe Width:  
Airframe Height:  
Landing Gear Dimensions
Landing Gear Base:  
Landing Gear Track:  
Cabin Dimensions
Cabin Internal Height:  
Cabin Internal Length:  
Cabin Internal Width:  

Weights and Performance

Data on aircraft weight and flight characteristics

Cruise Speed: 90 mph (144.841 km/h)

Max Gross Weight (ground): 4,990 kg 11,000 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 4,990 kg 11,000 lb
Empty Weight: 3,012 kg 6,640 lb
Useful Load: 1,978 kg 4,360 lb
Empty Weight Fraction: 0.604
Climb Performance
Max Rate of Climb: 8 m/s 1,500 fpm
Hover Performance
Hover Ceiling IGE:  
Hover Ceiling OGE:  
Max Level Flight Speed: 185 km/h 100 kts
Never Exceed Speed:  
Service Ceiling: 4,572 m 15,000 ft
Range and Endurance
Max Range: 257 km 139 nm
Max Endurance:  

Engine Details

Aircraft powerplant (lift and/or propulsion)

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

Number of engines: 2
Designation: Continental R-975-15 reciprocating
Manufacturer: Continental Motors
Normal Ratings
Max continuous:  
Take-off / rated: 391 kW 525 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: 19.81 m 65.00 ft
Direction of Rotation: Counter-rotating
Hub Type:
Main Rotor Blade Characteristics
Blade Construction:
Blade Chord:  
Blade Tip Geometry:
Blade Twist:  
Number of Blades: 2
Main Rotor Derived Characteristics
Disc Area: 308.28 m² 3318.4 ft²
Disc Loading: 8.09 kg/m² 1.657 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
Configuration: Unknown
Direction of Rotation: Unknown
Tail Rotor Blade Characteristics
Number of Blades:  
Blade Construction: N/A
Blade Chord:  
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area:  
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade):  

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