Helicopter engines are specialized power units designed to provide the necessary thrust for vertical flight. Most helicopters use either turbine engines or piston engines. Turbine engines are more common in larger helicopters due to their efficiency and power, while piston engines are typically found in smaller, lighter models. These engines convert fuel into mechanical energy, which drives the helicopter's rotor blades. The rotor blades generate lift, allowing the helicopter to ascend, descend, and maneuver in the air. Proper maintenance and operation of helicopter engines are crucial for safety and performance during flight.