L/Dmax
L/Dmax is the maximum lift-to-drag ratio that an aircraft can achieve, which occurs at a specific angle of attack and airspeed. This ratio is important because it determines the maximum range an aircraft can achieve for a given amount of fuel. Pilots use L/Dmax to determine the most efficient airspeed to fly for a given flight condition, such as cruising or gliding. A higher L/Dmax means the aircraft can fly farther on the same amount of fuel, while a lower L/Dmax means the aircraft will have a shorter range. Factors that affect L/Dmax include the aircraft's weight, altitude, and configuration.
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