2 place helicopter developed from a Sikorsky R-6.

Referred to as the Sikorsky LZ-1 in some documents. Doman rotor (see "American Helicopter Development" from FLIGHT, February 5th 1948 for a description of the rotor) installed onto a Sikorsky R-6A fuselage. First flight 1947.

An example on display at the New England Air Museum at Windsor Locks, CT.


Data on design, manufacture and status

Design authority: Doman-Frazier Helicopters, Inc.

Primary manufacturer: Doman-Frazier 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: 12.19 m 40.0 ft
Airframe Dimensions
Airframe Length: 10.34 m 33.9 ft
Airframe Width:  
Airframe Height: 3.35 m 11.0 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: 85 mph (137 km/h)

Max Gross Weight (ground): 1,361 kg 3,000 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 1,361 kg 3,000 lb
Empty Weight: 871 kg 1,920 lb
Useful Load: 490 kg 1,080 lb
Empty Weight Fraction: 0.640
Climb Performance
Max Rate of Climb: 5 m/s 899 fpm
Hover Performance
Hover Ceiling IGE:  
Hover Ceiling OGE:  
Max Level Flight Speed:  
Never Exceed Speed:  
Service Ceiling:  
Range and Endurance
Max Range: 644 km 348 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: Franklin O-405-9 reciprocating
Manufacturer: Franklin Engine Company
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: 12.19 m 39.99 ft
Direction of Rotation: Counterclockwise
Hub Type: No flap or lag hinges
Main Rotor Blade Characteristics
Blade Construction:
Blade Chord:  
Blade Tip Geometry:
Blade Twist:  
Number of Blades: 4
Main Rotor Derived Characteristics
Disc Area: 116.71 m² 1256.3 ft²
Disc Loading: 11.66 kg/m² 2.388 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: Unblocked
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

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Related Public Resources

Resources related to the LZ-1A , provided by public sources across the internet.