Vx (best angle of climb) is used immediately after takeoff to maximize altitude gained over horizontal distance, which is critical for clearing obstacles.
Vy (best rate of climb) is used after clearing obstacles to maximize altitude gained over time, allowing the aircraft to reach cruising altitude as quickly as possible.
The recommended takeoff procedure involves starting with Vx to clear obstacles, then transitioning to Vy; pilots are encouraged to practice Vx climbs for safety and proficiency.
Let’s imagine for a moment the following hypothetical situation: Two airplanes are taking off at exactly the same moment from parallel runways. Airplane A accelerates to and climbs out at Vx while Airplane B accelerates to and climbs at Vy.
What will happen in each case?
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