What are Vx and Vy and what do they optimize?

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What are Vx and Vy and what do they optimize?

In climb performance, Vx and Vy are specialized airspeeds that optimize different ways you gain altitude. Vx is the speed for the best angle of climb—the speed that gives the greatest increase in altitude per unit of horizontal distance. That means you get the steepest climb path, which is crucial when you need to clear obstacles with the least horizontal travel. Vy is the speed for the best rate of climb—the speed that yields the greatest altitude gain per unit time. This provides the fastest climb to a chosen altitude, maximizing how quickly you rise. Both speeds are defined for a specific airplane weight, configuration (such as flaps and landing gear), and altitude, so their exact values depend on those conditions. Typically Vx is lower than Vy, reflecting the trade-off between a steeper climb path (Vx) and a higher climb rate (Vy). They are not stall speed or landing speed; they’re about optimizing climb performance for different needs—steep obstacle clearance versus rapid ascent to cruise.

In climb performance, Vx and Vy are specialized airspeeds that optimize different ways you gain altitude. Vx is the speed for the best angle of climb—the speed that gives the greatest increase in altitude per unit of horizontal distance. That means you get the steepest climb path, which is crucial when you need to clear obstacles with the least horizontal travel.

Vy is the speed for the best rate of climb—the speed that yields the greatest altitude gain per unit time. This provides the fastest climb to a chosen altitude, maximizing how quickly you rise.

Both speeds are defined for a specific airplane weight, configuration (such as flaps and landing gear), and altitude, so their exact values depend on those conditions. Typically Vx is lower than Vy, reflecting the trade-off between a steeper climb path (Vx) and a higher climb rate (Vy). They are not stall speed or landing speed; they’re about optimizing climb performance for different needs—steep obstacle clearance versus rapid ascent to cruise.

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