What does the term "lift-to-drag ratio" indicate?

The term "lift-to-drag ratio" is a crucial measurement in glider performance that quantifies how effectively a glider can convert altitude (lift) into horizontal distance traveled. A higher lift-to-drag ratio signifies greater efficiency, meaning that for a given amount of lift generated, the glider experiences less drag, allowing it to glide further for each unit of lift produced.

Understanding this ratio is essential for pilots as it influences decision-making during flight, especially when planning for efficient climbs or descents and maximizing gliding distance between thermals or when searching for suitable landing areas. The ratio itself is derived from comparing the lift force to the drag force acting on the glider, which encompasses various aerodynamic factors.

The other terms mentioned touch on different aspects of glider performance but do not reflect the specific efficiency indicator that the lift-to-drag ratio represents.