The Soviet made Mil V-12 (Also referred to as the Mi-12, NATO reporting name "Homer") is the largest helicopter ever built. The name "Mi-12" would have been the name for the production helicopter. Since the V-12 never went into production and only two prototypes were built, the name "Mi-12" was never adopted.

General characteristics

Crew: 6 (pilot, copilot, flight engineer, electrician, navigator, radio operator)
Capacity:

VTOL 25,000 kg (55,000 lb) or
STOL 30,000 kg (66,000 lb) or
40,204.5 kg (88,636 lb) record
Length: 37.00 m (121 ft 4 in)
Rotor diameter: 2x 35.00 m (114 ft 10 in)
Height: 12.50 m (41 ft 0 in)
Loaded weight: 97,000 kg (213,850 lb)
Max takeoff weight: 105,000 kg (231,500 lb)
Powerplant: 4× Soloviev D-25VF turboshaft, 4,048 kW (6,500 shp) each
Freight compartment: 28.15x4.40x4.40 m (92 4x14 5x14 5 ft)
Performance

Maximum speed: 260 km/h (140 kt)
Range: 500 km (310 miles)
Service ceiling: 3,500 m (11,500 ft)