Which of the following provides maximum obstacle clearance during climb?

The speed for maximum climb angle, known as VX, is specifically designed to provide the best angle of climb over a given distance. This means that when an aircraft is climbing at VX, it can achieve the greatest altitude gain for the least horizontal distance traveled. This is crucial when dealing with obstacles, such as trees or buildings, near an airport or during takeoff. By maximizing the climb angle, the aircraft ensures that it can clear these potential obstacles as quickly and effectively as possible.

Choosing this speed is particularly important in scenarios where obstacle clearance is critical, as the higher angle of ascent means that the aircraft will be at a safer altitude more quickly compared to other speeds. Other choices such as 1.2 VS (the stall speed) or the speed for maximum rate of climb may not prioritize the vertical distance gained relative to the distance traveled forward, which is essential for ensuring safety in obstacle-rich environments. Similarly, adjusting flap settings does not inherently contribute to maximizing climb performance in terms of obstacle clearance.