The EP-4 engine is an electronically controlled fuel injection, TCI ignition, air-cooled, horizontally opposed twin cylinder aviation piston engine. It has a high degree of lightweighting, good consistency in component and overall condition, long service life, and easy maintenance. It has an independently developed electronic control system and an integrated starter motor. Can be widely used for fixed wing and composite wing unmanned aerial vehicles.

EP-4GAC gasoline aviation piston engine is equipped with a starter motor, which is more suitable for unmanned aerial vehicles with less power demand than models equipped with an integrated starter motor.