Developed in 1935 in cooperation with Cierva.  The enclosed cabin accomodates two passengers, including the pilot.  The project was canceled due to high vibration and the death of Cierva in 1936.

For more information: AHS History Calendar | February 2015: Westland CL.20 Autogiro


Data on design, manufacture and status

Design authority: Westland Aircraft Ltd

Primary manufacturer: Westland Aircraft Ltd

Parent type: No type defined

Aircraft status: No longer flying


Primary flight and mechanical characteristics

VTOL type: Gyroplane

Compound type: Lift

Lift configuration: Single main rotor

Dedicated control device: Rudder

Dedicated propulsion devices: 1

Crew required: 1

Crew seating: Side-by-side

Landing gear: Wheels (non-retractable)

Layout and Dimensions

Data on aircraft size

Overall Dimensions
Overall Height:  
Overall Length:  
Overall Width: 10.36 m 34.0 ft
Airframe Dimensions
Airframe Length: 6.17 m 20.2 ft
Airframe Width:  
Airframe Height: 3.12 m 10.2 ft
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

Max Gross Weight (ground): 635 kg 1,400 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 635 kg 1,400 lb
Empty Weight: 381 kg 840 lb
Useful Load: 254 kg 560 lb
Empty Weight Fraction: 0.600
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: Pobjoy Niagara S reciprocating
Manufacturer: Pobjoy Airmotors and Aircraft
Normal Ratings
Max continuous:  
Take-off / rated: 67 kW 90 hp
OEI Ratings
OEI contingency:  
OEI continuous:  
OEI 30-second:  
OEI intermediate:  

Primary Lift Device

Data on primary lift devices such as main rotors

The main rotor may be folded.

Main Rotor Characteristics
Diameter: 10.36 m 34.00 ft
Direction of Rotation: Counterclockwise
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: 84.35 m² 908.0 ft²
Disc Loading: 7.53 kg/m² 1.542 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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