Airplane Flight Instructor Practice Test

The angle of attack at which an airplane achieves maximum horizontal distance per foot of altitude lost is known as the "optimum glide angle." This is typically around 6 degrees for most aircraft. At this angle of attack, the lift-to-drag ratio is maximized, meaning the aircraft can cover the greatest horizontal distance while descending.

When the angle of attack is too low, the lift generated is insufficient to maintain a longer glide path, resulting in a steeper descent. Conversely, at too high an angle of attack, the aircraft risks entering a stall condition, which significantly decreases its ability to glide effectively. Therefore, 6 degrees strikes an ideal balance where the aircraft maintains an efficient glide, optimizing distance traveled relative to altitude lost. This principle is critical during glide flight scenarios, such as engine failure, when maximizing distance is often essential for reaching a suitable landing area.