As the weight of an aircraft decreases, what happens to the airspeed for maximum lift-to-drag ratio (L/D)?

As the weight of an aircraft decreases, the airspeed for maximum lift-to-drag ratio (L/D) also decreases. The lift-to-drag ratio is a crucial performance metric in aviation, as it reflects the aircraft's aerodynamic efficiency.

At its core, the optimal airspeed for achieving maximum L/D is influenced by the weight of the aircraft. When the weight decreases, the lift required to maintain level flight also decreases. This means that the aircraft can achieve the necessary lift at a lower airspeed.

When considering the factors affecting lift and drag, it's important to note that the aircraft's wings require a specific amount of airflow (related to speed) to generate the lift necessary for flight. With less weight to counteract, a slower airspeed suffices to create adequate lift while keeping drag at a minimum. This relationship has implications for fuel efficiency and overall flight characteristics, especially during cruise and gliding phases, reinforcing why the airspeed for maximum L/D declines as weight reduces.