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.

The V-12 features the only two-rotor transverse scheme ever built by Mil eliminating the need for a tail rotor. The twin engines were taken together with the rotors from the Mil Mi-6 and duplicated