Doman LZ-4
# Doman LZ-4

The Doman LZ-4 was an American eight-seat helicopter designed and developed by Doman Helicopters of Danbury, Connecticut.

## Design and development

Following the test flying of the Doman LZ-2A, Doman Helicopters developed an eight-seat helicopter with the designation LZ-4. The fuselage had 3 rows of double seats in the main cabin and a two-crew flight deck in the front. Large folding doors allowed for loading bulky cargo into the main compartment. The tail boom was conventional with a cranked-up rear section mounting a tail rotor, and the helicopter was supported by a four-leg undercarriage.

## Specifications (LZ-4)

Data from Aerofiles : Doman LZ-4, vertipedia Doman LZ-4

General characteristics

* Capacity: 8
* Length: 38 ft 1 in (11.61 m)
* Height: 11 ft 2 in (3.41 m)
* Empty weight: 2,970 lb (1,347 kg)
* Gross weight: 4,773 lb (2,165 kg)
* Max takeoff weight: 4,700 lb (2,132 kg)
* Powerplant: 1 × Lycoming SO-580-B 8-cyl air-cooled horizontally-opposed piston engine, 400 hp (300 kW) for take-off
* Main rotor diameter: 48 ft 0 in (14.64 m)
* Main rotor area: 1,809.5 sq ft (168.11 $m^2)$

Performance

* Cruise speed: 78 mph (125 km/h, 67 kn)
* Range: 209 mi (336 km, 181 nmi)
* Service ceiling: 16,001 ft (4,877 m)
* Rate of climb: 790 ft/min (4 m/s)
* Disk loading: 2.60 lb/sq ft (12.68 $kg/m^2)$
