Definitions for "Ground effect"
The reduced air pressure under a vehicle that allows the normal pressure above the vehicle to push the vehicle downward, providing a better grip on the road surface.
Reaction of a rotor downdraft against the ground surface, forming a "ground cushion" that increases lifting capability of that section of air.
Type of down force that is generated by a special formed underside of a racecar. Is the most effective like an upside-down aircraft wing, this increases the speed of air flowing under the car, and thereby generating a suction effect.
A loss of operating range, sometimes significant, when wireless antennas are positioned near to the ground. Caused by partial signal cancellations due to RF energy reflected up from the ground mixing with the direct RF signal. Because of the shorter wavelengths involved, UHF frequencies usually are less affected than VHF frequencies.