Doman LZ-4

Following the test flying of the Doman LZ-2A, Doman Helicopters developed an eight-seat helicopter with the designation LZ-4.^[1] 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.^[3]

Data from Aerofiles : Doman LZ-4,^[1] vertipedia Doman LZ-4^[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 m²)

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/m²)