Which aerodynamic force works against the force of lift in helicopters?

In helicopters, the aerodynamic force that works against the force of lift is drag. Lift is generated by the rotor blades as they move through the air, creating a differential pressure that allows the helicopter to rise. However, as the helicopter moves, it also encounters resistance from the air, known as drag. This drag opposes the helicopter's forward movement and can affect its overall performance.

Drag is a crucial consideration in helicopter flight because it reduces the efficiency of the lift generated by the rotor blades. There are different types of drag, such as parasitic drag and induced drag, which play a role depending on the helicopter's speed, design, and flight conditions. Understanding drag and its effects is essential for pilots and engineers when optimizing helicopter performance and maneuverability during flight.