Glossary

V

VAFB Vandenberg Air Force Base

VHF Very High Frequency; any radio frequency between 30 and 300 megacycles per second

viscosity Resistance to flow or change of shape under pressure

VLBA Very Long Baseline Array; a set of 10 radio telescopes in the continental United States, Hawaii, and St. Croix

VOA Voice of America

vortices Circular patterns of air created from lift generated by the wings (or rotor) of an aircraft or helicopter; the vortices from one aircraft may pose a hazard to following aircraft

VSRA V/STOL System Research Aircraft

V/STOL Vertical/Short Takeoff and Landing