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The World Biggest Helicopter ever made - Mil Mi-26 ( NATO call it Halo), A Soviet Union/ Russian heavy transport helicopter, the largest ever made. Manufactured by Rostvertol design by Mil Moscow Helicop Plant , where first flight 14 December 1977, introduce in 1983. Use by the Russian Air Force, Aeroflot, Ukrainian Air Force, Indian Air Force ; Number ever built 316.

The Halo's power and payload capacity is more than twice that of the U.S Army's workhorse CH-47 Chinook helicopter.

As of 2016, the Mi-26 still holds the Fédération Aéronautique Internationale world record for the greatest mass lifted to 2,000 metres (6,562ft) - 56,768.8 kilograms (125,153.8lb) on a flight in 1982

Source Credit Photo to : Alex Beltyukov
http://www.airliners.net/photo/Russia---Air/Mil-Mi-26/2281675/L/

Other Source Credit to - https://en.wikipedia.org/wiki/Mil_Mi-26

Specifications (Mi-26)
Crew:Five: 2 pilots, 1 navigator, 1 flight engineer, 1 flight technician
Capacity:
90 troops or 60 stretchers
20,000 kg cargo (44,090 lb)
Length: 40.025 m (131 ft 3¾ in) (rotors turning)
Rotor diameter: 32.00 m (105 ft 0 in)
Height: 8.145 m (26 ft 8¾ in)
Disc area: 804.25 m2 (8,656.8 ft²)
Empty weight: 28,200 kg (62,170 lb)
Loaded weight: 49,600 kg (109,350 lb)
Max. takeoff weight: 56,000 kg (123,450 lb)
Powerplant: 2 × Lotarev D-136 turboshafts, 8,500 kW (11,399 shp) each
Main rotor RPM: 132
Performance
Maximum speed: 295 km/h (159 kn, 183 mph)
Cruise speed: 255 km/h (137 kn, 158 mph)
Range: 1,920 km (1,036 nmi, 1,190 mi) (with auxiliary tanks)
Service ceiling 4,600 m (15,100 ft)