OP-4 was the fourth protoype in the development program for the Russian Mi-38 medium multipurpose helicopter.
Data is based on the year 2017 data points of the fourth protoype and 2000 Russia's Helicopter World catalog data points of the Mi-38.
VTOL type: Helicopter
Lift devices: 1 Single main rotor
Dedicated control device: 1 Tail rotor
Crew required: 1-3 in Side-by-side arrangement
Landing gear: Wheels (non-retractable)