Best Rate of Climb for a jet and a propeller aircraftBest Rate of Climb as a function of altitude
An F-15 Eagle climbing and releasing flares (left) and a Boeing 737 Enter Air, climbing with typical angle of attack for civil airplanes, to give optimal rate of climb (right)
In aeronautics, the rate of climb (RoC) is an aircraft's vertical speed, that is the positive or negative rate of altitude change with respect to time.[1] In most ICAO member countries, even in otherwise metric countries, this is usually expressed in feet per minute (ft/min); elsewhere, it is commonly expressed in metres per second (m/s). The RoC in an aircraft is indicated with a vertical speed indicator (VSI) or instantaneous vertical speed indicator (IVSI).
The temporal rate of decrease in altitude is referred to as the rate of descent (RoD) or sink rate.
A negative rate of climb corresponds to a positive rate of descent: RoD = −RoC.
^"Vx vs. Vy". flyingmag.com. 4 October 2011. Retrieved 16 March 2018.
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