Which speed is identified as the minimum drag speed for maximum range in level flight?

The minimum drag speed for maximum range in level flight corresponds to the best lift-to-drag ratio. At this speed, an aircraft generates the maximum lift for the least amount of drag, which allows it to travel the farthest distance for a given amount of fuel.

When the lift-to-drag ratio is optimized, it signifies that the aircraft is flying at the most efficient point, where energy expenditure is minimized. This balance is crucial for maximizing range, as every ounce of fuel translates into distance traveled. Therefore, maintaining this specific speed is essential for pilots aiming to extend their flight range effectively.

In contrast, the other options refer to different performance characteristics. The maximum power speed relates to the point where the aircraft achieves the highest thrust from its engines, which is more about climbing performance or speed than optimizing fuel efficiency. The best climb angle speaks to the steepest ascent in altitude over distance, which again is not focused on maximizing range. Lastly, minimum power speed indicates the lowest speed at which the aircraft can maintain level flight without excessive power use, but it does not necessarily align with minimizing drag, hence it doesn't represent the optimal speed for range.