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 configuration: Single main rotor
Dedicated control device: Tail rotor
Crew required: 1-3
Crew seating: Side-by-side
Landing gear: Wheels (non-retractable)
Overall Width: 21.10 m (69.2 ft)
Max Gross Weight (ground): 15600 kg (34392 lb)