Vx (best angle of climb) is used immediately after takeoff to maximize altitude over a horizontal distance for obstacle clearance, while Vy (best rate of climb) is used afterwards to gain altitude quickly over time.
The initial use of Vx addresses a "distance problem" (clearing obstacles), while the subsequent transition to Vy solves a "time problem" (efficiently reaching cruise altitude).
Many pilots avoid flying at Vx due to discomfort with slow speeds near the ground; for safety at airports with obstacles, the FAA recommends a blend of Vx and Vy and suggests practicing Vx climbs with an instructor.
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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