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General Info

Mil V-12 type 65
NATO  name: 'Hoomer'


General information
Type Heavy lift helicopter
Manufacturer Mil Design Bureau
Status Prototypes tested, cancelled
Primary user Soviet Union
Number built 2
History
First flight (27 June 1967 – unsuccessful)10 July 1968 – first successful flight
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History Mil Moscow Helicpter plant Mil V-12 type 65
 NATO reporting name: 'Hoomer'



The Mil V-12 (NATO reporting name: Homer), given the project number Izdeliye 65 ("Item 65"), is a prototype helicopter designed in the Soviet Union and the largest helicopter ever built. The designation "Mi-12" would have been the designation for the production helicopter and did not apply to V-12 prototypes

Operational history Construction of the first prototype was completed in 1968. A first flight on 27 June 1967 ended prematurely due to oscillations caused by control problems; one set of main wheels contacted the ground hard bursting a tyre and bending a wheel hub. The cause of the oscillations proved to be a harmonic amplification of vibrations in the cockpit floor feeding back into the control column when a roll demand was input into the cyclic stick. It was widely but erroneously reported in the Western press that the aircraft had been destroyed

  • Design

    Mil V-12 at the Central Air Force Museum

    Design studies for a giant helicopter were started at the Mil OKB in 1959, receiving official sanction in 1961 by the GKAT (Gosudarstvenny Komitet po Aviatsionnoy Tekhnike - State Committee on Aircraft Technology) instructing Mil to develop a helicopter capable of lifting 20 to 25 tonnes (22 to 28 short tons). The GKAT directive was followed by a more detailed specification for the V-12 with hold dimensions similar to the Antonov An-22, intended to lift major items of combat material as well as 8K67, 8K75 and 8K82 inter-continental ballistic missiles (ICBM).

    Design limitations forced Mil to adopt a twin rotor system but design studies of a tandem layout, similar to the Boeing CH-47 Chinook, revealed major problems. The single rotor layouts also studied proved to be non-viable, leading to the transverse layout chosen for the finished article

    Variants Military

    Lower cockpit of Mil V-12
    Mil V-12 at the Central Air Force Museum in 2022

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Ceiling

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MAX RANGE

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Aircraft Speed

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Mil Moscow Helicpter plant Mil V-12 type 65
NATO reporting name: 'Hoomer'

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Mil Moscow Helicpter plant Mil V-12 type 65 NATO reporting name: 'Hoomer'

Mil Moscow Helicpter plant Mil V-12 type 65
NATO reporting name: 'Hoomer'

1

General characteristics

  • Crew: 6 (pilot, copilot, flight engineer, electrician, navigator, radio operator)
  • Capacity: 196 passengers
    • normal 20,000 kg 
    maximum 40,000 kg
    • Length: 37 m (121 ft 5 in)
    • Wingspan: 67 m  across rotors
    • Height: 12.5 m 
    • Empty weight: 69,100 kg 
    • Gross weight: 97,000 kg 
2

Powerplant

  • Powerplant: 4 × Soloviev D-25VF turboshaft engines, 4,800 kW (6,500 shp) each 26,000 HP total
  • Main rotor diameter: 2 × 35 m)
  • Main rotor area: 962 m2 (10,350 sq ft) two 5-bladed rotors located transversely, area is per rotor (1,924 m2 (20,710 sq ft) total area)
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Specifications

  • Maximum speed: 260 km/h 
  • Cruise speed: 240 km/h 
  • Range: 500 km (310 mi, 270 nmi)
  • Ferry range: 1,000 km (620 mi, 540 nmi) with external fuel tanks
  • Service ceiling: 3,500 m (11,500 ft)
  • Disk loading: 50.5 kg/m2 (10.3 lb/sq ft) at gross weight
  • Hovering ceiling in ground effect: 10 m (33 ft)
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Armament

Special Links Mil Moscow Helicpter plant Mil V-12 type 65 NATO reporting name: 'Hoomer'

Links to Youtube & Others

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.

Mil Helicpter plant
Mil V-12 type  'Hoomer'

The V-12 features the only two-rotor transverse scheme ever built by Mil eliminating the need for a tail rotor.

interior

Youtube Link

The Soviet Kamov OKB built an experimental aircraft with the same scheme in 1958, Kamov Ka-22 Vintokryl . This aircraft had also the combined wing/rotor arrangement later used on the Mil V-12.

interior
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