For a jet aeroplane, the maximum climb angle is achieved at a speed corresponding to what?

The maximum climb angle for a jet aeroplane is achieved at a speed that corresponds to the maximum lift-to-drag ratio, often represented as CL/CD. This is because the maximum climb angle is a function of both lift and drag: to achieve the best climb performance, the aircraft must optimize its lift while minimizing drag.

When the aircraft is at the speed that corresponds to the maximum lift-to-drag ratio, it uses available thrust most efficiently to climb. This speed allows the aircraft to generate the most altitude gain for the least amount of distance traveled horizontally. Therefore, flying at this optimal speed enhances the aircraft's performance by ensuring it maintains sufficient lift while experiencing less drag, effectively maximizing its climb angle.

In contrast, other speeds like 1.1 or 1.2 times the stall speed (VS) do not focus on achieving the maximum lift-to-drag ratio and may result in less efficient climb performance.