What speed is indicated by Vf?

The indicated speed represented by Vf is known as the designed flap speed. This is the maximum speed at which the aircraft can safely operate with its flaps extended to a particular position. It is crucial for pilots to adhere to this speed to ensure that the aircraft maintains optimal control and performance during critical flight phases, particularly during landing and approach where flap deployment is common.

Understanding Vf helps pilots manage their speed effectively when flying with flaps, preventing potential aerodynamic issues, such as a stall or excessive drag, that can occur at speeds above this limit. Maintaining this speed ensures that the aircraft will perform as expected with the flaps deployed, allowing for a safe and stable flight operation.