What is the main effect of drag on an aircraft's flight?

The main effect of drag on an aircraft's flight is that it increases the thrust required for the aircraft to maintain a given airspeed and altitude. Drag is the aerodynamic resistance that opposes the forward motion of the aircraft through the air. As drag increases with speed, the engines must produce more thrust to overcome this resistance.

This relationship is crucial for pilots and engineers to understand, as it impacts fuel efficiency, performance capabilities, and the overall design of the aircraft. Managing drag is essential during various phases of flight, such as takeoff, cruising, and landing, where different flight configurations can alter drag levels.

While drag does not generate lift or decrease weight, it significantly influences the dynamics of flight by necessitating a higher thrust output, affecting fuel consumption and overall operational efficiency. Thus, understanding the role of drag is vital for effective aircraft operation and performance management.