| Velocity: |
The speed of an object, in a certain direction. The rate of change of position in relation to time. |
| Vertical axis: |
The axis extending straight up and down through the center of gravity of an aircraft. The vertical axis is perpendicular to the longitudinal and lateral axes. The vertical axis is sometimes called the "z" axis. Yaw is a motion around the vertical axis. |
| Vertical Shear: |
The rate of change of wind speed or direction, with a given change in height. |
| vertical stabilizer: |
The vertical part of the tail. The vertical stabilizer helps to increase the stability of the aircraft. It is also known as a fin.
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| VFR: |
Visual Flight Rules. Prescribed for the operation of aircraft in visual meteorological conditions (VMC). VMC is generally defined as five miles visibility or more and 1,000 feet vertical and one nautical mile horizontal clearance from cloud, but variation |
| VGA: |
A resolution of 640 x 480. |
| VHF: |
Very high frequency. Radio frequencies in the 30-300 MHz band, used for most civil air-to-ground communication. |
| Victor: |
Stands for the letter V in the phonetic alphabet. |
| Video card: |
A card the fits into a computer's expansion slot so you can edit digital video. |
| Viewfinder: |
Is a system used for composing and sometimes focusing the subject. There are several types: direct vision, optical, ground glass or reflex. |
| Visibility: |
A measure of the opacity of the atmosphere, and therefore, the greatest distance one can see prominent objects with normal eyesight. The National Weather Service has various terms for visibility. Surface visibility is the prevailing visibility determined |
| VOR: |
Very High Frequency Omnidirectional Range. A transmitter located on the ground that aids airborne navigation by transmitting the magnetic bearing of the aircraft's position relative to the transmitter location. |
| VTOL: |
Vertical TakeOff and Landing - Aircraft that have the capability of vertical takeoff and landing. VTOL aircraft are not limited to helicopters |
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