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The Maximum Lift-to-Drag Ratio is the highest ratio of lift force to drag force that an aircraft can achieve. It represents the most efficient aerodynamic performance point for an aircraft.
The calculator uses the formula:
Where:
Explanation: This formula provides the relationship between the lift-to-drag ratio at maximum endurance and the maximum achievable lift-to-drag ratio for prop-driven aircraft.
Details: The maximum lift-to-drag ratio is a critical performance parameter that indicates the aerodynamic efficiency of an aircraft. Higher values represent more efficient aircraft that can fly longer distances with less fuel consumption.
Tips: Enter the lift to drag ratio at maximum endurance. The value must be greater than zero. The calculator will compute the maximum lift-to-drag ratio.
Q1: Why is 0.866 used in the formula?
A: The constant 0.866 is derived from aerodynamic theory and represents the relationship between maximum endurance performance and maximum lift-to-drag performance for prop-driven aircraft.
Q2: Does this formula apply to all aircraft types?
A: This specific formula is primarily applicable to prop-driven aircraft. Jet aircraft may have different relationships between these parameters.
Q3: What are typical values for maximum lift-to-drag ratio?
A: Typical values range from 10-20 for general aviation aircraft, 15-25 for business jets, and up to 40-50 for high-performance gliders and specialized aircraft.
Q4: How does maximum lift-to-drag ratio affect aircraft performance?
A: Higher maximum lift-to-drag ratios enable longer range, better fuel efficiency, improved climb performance, and higher cruise altitudes.
Q5: Can this ratio be improved through design modifications?
A: Yes, through aerodynamic refinements such as wing design optimization, reduced drag surfaces, improved airfoil selection, and weight reduction.