Tag Archives: Tandem Rotor

6 August 1969

One of the two Mil Design Bureau V-12 heavy lift helicopter prototypes, 1971. (Groningen Airport-Eelde)

6 August 1969: The largest helicopter ever built, the four-engine, transverse tandem rotor Mil V-12, registration CCCP-21142, lifted a payload of 88,636 pounds (44,205 kilograms) to an altitude of 7,400 feet (2,255 meters). This weight record has never been broken by any helicopter.

FAI Record File Num #9916 [Direct Link]
Status: ratified – current record
Region: World
Class: E (Rotorcraft)
Sub-Class: E-1 (Helicopters)
Category: General
Group: 2 : turbine
Type of record: Altitude with 35 000 kg payload
Performance: 2 255 m
Date: 1969-08-06
Course/Location: Podmoskovnoe (USSR)
Claimant Vasily Kolochenko (URS)
Crew L.V. VLASSOV, V.V. JURAVLEV, V.P. BARTCHENKOV, S.G. RIBALKO, A.I. KRUTCHKOV
Rotorcraft: MIL M-12 (V-12)
Engines: 4 Soloviev D-25 VF

FAI Record File Num #9917 [Direct Link]
Status: ratified – current record
Region: World
Class: E (Rotorcraft)
Sub-Class: E-1 (Helicopters)
Category: General
Group: 2 : turbine
Type of record: Altitude with 40 000 kg payload
Performance: 2 255 m
Date: 1969-08-06
Course/Location: Podmoskovnoe (USSR)
Claimant Vasily Kolochenko (URS)
Crew L.V. VLASSOV, V.V. JURAVLEV, V.P. BARTCHENKOV, S.G. RIBALKO, A.I. KRUTCHKOV
Rotorcraft: MIL M-12 (V-12)
Engines: 4 Soloviev D-25 VF

FAI Record File Num #9937 [Direct Link]
Status: ratified – superseded since approved
Region: World
Class: E (Rotorcraft)
Sub-Class: E-1e (Helicopters: take off weight 3000 to 4500 kg)
Category: General
Group: 2 : turbine
Type of record: Greatest mass carried to height of 2 000 m
Performance: 40 204.5 kg
Date: 1969-08-06
Course/Location: Podmoskovnoe (USSR)
Claimant Vasily Kolochenko (URS)
Crew L.V. VLASSOV, V.V. JURAVLEV,V.P. BARTCHENKO,S.G. RIBALKO,A.I. KRUTCHKOV
Rotorcraft: MIL M-12 (V-12)
Engines: 4 Soloviev D-25 VF

This was the first of two prototypes built by the Mil Design Bureau. (Both had the same registration number: 21142.) It was intended to transport intercontinental ballistic missiles and load them directly into underground silos where there were no existing roads. The V-12 used two main rotor, transmission and twin engine systems from the single rotor Mil-6 helicopter. With counter-rotating main rotors, the torque created by each rotor system is cancelled out, eliminating the need for a tail, or anti-torque, rotor. This makes the total power produced available for lift. Each rotor had a diameter of 114 feet, 10 inches (35 meters). The four Soloviev D-25VF turboshaft engines combined to produce 26,000 horsepower. The aircraft was operated by a six-man crew. It’s maximum takeoff weight was 231,500 pounds (105,000 kilograms). It had a range of 310 miles (500 kilometers). Maximum speed of the V-12 was 140 knots (260 kilometers per hour) and the service ceiling was 11,500 feet (3,500 meters).

The helicopter was not put into series production. The record-setting first prototype is at the Mikhail Leontyevich Mil helicopter factory at Panki-Tomilino, near Moscow.

World Record Mil Mi-12 at Tomolino.
World Record holding Mil Mi-12 at Tomolino. (Yuriy Lapitskyi)

© 2015, Bryan R. Swopes

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