Which flight condition yields maximum range and best glide?

• A. Maximum rate of climb
• B. Maximum range and best glide
• C. Maximum stall speed
• D. Maximum structural load

Answer: (A)

Maximizing distance and the ability to glide the farthest come from flying at the speed that gives the highest lift-to-drag ratio. That efficiency—L over D max—minimizes drag for the lift being produced, so you can travel farther for a given amount of altitude loss in a glide and, in level powered flight, you get the greatest range for the fuel used. The same condition is what yields the best glide, since the glide ratio is best when L/D is maximum.

So the option that describes maximum range and best glide matches this optimal aerodynamic efficiency. The other options correspond to performance aims that don’t optimize forward travel: maximum rate of climb prioritizes climb performance and power usage, not distance; maximum stall speed is associated with near-stall conditions with high drag and reduced forward speed; maximum structural load is a limits question, not a range or glide condition.