Vertipedia - Doman LZ-1A

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.

Overview

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

Configuration

Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift devices: 1 Single main rotor

Dedicated control device: 1 Tail rotor

Crew required: 1 in Side-by-side arrangement

Landing gear: Wheels (non-retractable)

Key Characteristics

Data on key physical features

Aircraft Details

Data on aircraft configuration, weights, flight performance and equipment

Layout and Dimensions

Weights and Performance

Engine Details

Primary Lift Device

Primary Control Device

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:

Cruise Speed: 85 mph (137 km/h)

Weights
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

Climb Performance
Max Rate of Climb:	5 m/s	899 fpm

Hover Performance
Hover Ceiling IGE:
Hover Ceiling OGE:

Limitations
Max Level Flight Speed:
Never Exceed Speed:
Service Ceiling:

Range and Endurance
Max Range:	644 km	348 nm
Max Endurance:

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

Powerplant
Number of engines:	1
Designation:	Franklin O-405-9 reciprocating
Manufacturer:	Franklin Engine Company

Normal Ratings
Max continuous:
Take-off / rated:
Intermediate:
Maximum:

OEI Ratings
OEI contingency:
OEI continuous:
OEI 30-second:
OEI intermediate:

Main Rotor Characteristics
Diameter:	12.19 m	39.99 ft
RPM:
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
Solidity:

Main Rotor Blade Derived Characteristics
Blade area per blade:
Tip Speed:

Tail Rotor Characteristics
Diameter:
Configuration:	Unblocked
Direction of Rotation:	Unknown
RPM:

Tail Rotor Blade Characteristics
Number of Blades:	3
Blade Construction:
Blade Chord:
Blade Twist:

Tail Rotor Derived Characteristics
Disc Area:
Solidity:

Tail Rotor Blade Derived Characteristics
Tip Speed:
Blade Area (per blade):

References

References and sources used

Helicopters & Autogyros of the World

Paul Lambermont, Anthony Pirie
Cassell & Company Ltd., 1959 (page 262)
Book

History of Doman Helicopters

duPont, S., Montgomery, G.
Journal of the American Helicopter Society, Vol. 1, No. 1, January 1956, 01 Jan 1956 (page 65)
Periodical
Comprehensive of the company, product development and rotor system design