What is VY defined as in 14 CFR part 1?

VY, or the best rate of climb speed, is defined in 14 CFR part 1 as the speed at which an aircraft achieves the maximum vertical speed over time. This speed is crucial for pilots during takeoff and initial climb-out, as it allows them to gain altitude as quickly as possible for a given set of conditions. By flying at VY, pilots can ensure that they are maximizing their climb performance, which is particularly important in scenarios where terrain or obstacles require a swift ascent.

Understanding VY is essential for flight safety and efficiency, as it helps pilots make informed decisions during critical phases of flight like takeoff and climb. This choice clearly embodies the essence of optimal climb performance, distinguishing it from other options that relate to descent or different types of climbing performance.