What is the definition of drag in aviation?

Drag in aviation refers to the resistance an aircraft experiences as it moves through the air. This aerodynamic force opposes the aircraft's forward motion, making it crucial for pilots and engineers to understand in order to optimize performance and fuel efficiency.

Drag can be caused by various factors, including the shape of the aircraft, the surface texture, and the speed at which it travels. It is a key component in the study of flight dynamics, as balancing the forces of lift, weight, thrust, and drag is essential for safe and efficient flight operations. Understanding drag helps in designing aircraft that can minimize resistance, allowing for improved speed and reduced fuel consumption, which is vital for commercial aviation, such as operations conducted by Ryanair.