The aircraft was built by Doman and later financed by Curiss Wright (as a development vehicle). The aircraft was designated as the CW-40 by Curtiss Wright.

The aircraft was an 8 place machine.

Tthe aircraft also served as the prototype fro the LZ-5 (YH-31).


Data on design, manufacture and status

Design authority: Doman Helicopters Inc.

Primary manufacturer: Doman Helicopters Inc.

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: Wheels (non-retractable)

Layout and Dimensions

Data on aircraft size

Overall Dimensions
Overall Height:  
Overall Length:  
Overall Width: 14.63 m 48.0 ft
Airframe Dimensions
Airframe Length: 11.61 m 38.1 ft
Airframe Width:  
Airframe Height: 3.40 m 11.2 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

Cruise Speed: 78 mph (126 km/h)

Max Gross Weight (ground): 2,132 kg 4,700 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 2,132 kg 4,700 lb
Empty Weight: 1,347 kg 2,970 lb
Useful Load: 785 kg 1,730 lb
Empty Weight Fraction: 0.632
Climb Performance
Max Rate of Climb: 4 m/s 800 fpm
Hover Performance
Hover Ceiling IGE:  
Hover Ceiling OGE:  
Max Level Flight Speed:  
Never Exceed Speed:  
Service Ceiling: 4,877 m 16,000 ft
Range and Endurance
Max Range: 338 km 183 nm
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 SO-590-B reciprocating
Manufacturer: Lycoming Engines
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: 14.63 m 48.00 ft
Direction of Rotation: Clockwise
Hub Type:
Main Rotor Blade Characteristics
Blade Construction:
Blade Chord:  
Blade Tip Geometry:
Blade Twist:  
Number of Blades: 4
Main Rotor Derived Characteristics
Disc Area: 168.11 m² 1809.6 ft²
Disc Loading: 12.68 kg/m² 2.597 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: Tractor
Direction of Rotation: Unknown
Tail Rotor Blade Characteristics
Number of Blades: 3
Blade Construction:  
Blade Chord:  
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area:  
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade):  

Related VFS Resources

Resources related to the LZ-4 (CW-40), provided by the Vertical Flight Society.
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Related Public Resources

Resources related to the LZ-4 (CW-40), provided by public sources across the internet.