VF speed, in aviation, stands for design flap speed.
VF represents the maximum speed at which an aircraft's flaps were designed to be extended safely. This speed is a critical limitation determined during the aircraft's design and certification process. Exceeding VF speed when flaps are extended can put excessive stress on the flap structure and the aircraft itself, potentially leading to damage or control issues.
According to the Federal Aviation Administration (FAA), the definition is straightforward:
- **VF means design flap speed.**
The FAA also defines several other important V-speeds related to flaps and stability:
| Speed | Definition |
|---|---|
| VF | Design flap speed |
| VFC/MFC | Maximum speed for stability characteristics |
| VFE | Maximum flap extended speed |
| VFTO | Final takeoff speed |
Understanding VF and other V-speeds is essential for pilots to operate aircraft within their certified limitations, ensuring safety and structural integrity during various phases of flight, particularly during takeoff and landing approaches when flaps are used.
