ground effect


Also found in: Dictionary, Thesaurus, Acronyms, Wikipedia.

ground effect

[′grau̇nd i‚fekt]
(aerospace engineering)
Increase in the lift of an aircraft operating close to the ground caused by reaction between high-velocity downwash from its wing or rotor and the ground.
(communications)
The effect of ground conditions on radio communications.

ground effect

ground effect
In-ground effect.
ground effect
Out-of-ground effect hover.
ground effectclick for a larger image
ground effectclick for a larger image
The ground effect on a half-wave, horizontal dipole antenna, viewed from the axis of the wire. At A, the radiation pattern in the absence of ground; at B the radiation pattern for an antenna height of ¼ wavelength over perfectly conducting ground; at C, a typical radiation pattern for antenna height of ¼ wavelength over normal ground.
i. The change in the aerodynamic reaction on an aircraft caused by the proximity of the ground. An aircraft, helicopter, or any other flying machine flying very near to the ground experiences an increase in lift. This additional lift or cushioning is caused by an effective increase in the angle of attack by the deflection of the downwash and without an increment in the induced drag. The ground effect diminishes rapidly when the aircraft is higher than about half a wingspan or three-quarters of a diameter of rotor disc above the ground. Other factors that influence the ground effect are the nature of the ground, its slope, and the prevalent wind. In the case of rotorcraft operating near the ground, induced drag is reduced, and the lift vector becomes more vertical as a result of the reduced inflow velocity. The vortex ring becomes smaller, and hovering can be sustained with less power.
ii. All unwanted effects caused by ground interference on radars, radio NAVAIDS (navigational aids), and other electromagnetic systems. See ground clutter.
iii. The modification of the directional pattern of an antenna system, especially at the very low, low, medium, and high frequencies, by the presence of the surface of the earth underneath the antenna. The effect is more pronounced in the vertical, or elevation, plane than in the horizontal plane. Ground effects have a large influence on the optimum distance at which the communication is realized.
References in periodicals archive ?
It features a blue insert in the honeycomb grille, wide alloy wheels, and ground effects on the rocker panels and both bumpers.
June 27, 2012 /PRNewswire/ -- LINE-X Protective Coatings, the nation's leading developer and provider of high performance protective coatings and spray-on truck bedliners, along with Graham Partners, today announced that they have assumed controlling interest in one of Detroit's most well-known and leading Tier 1 automotive aftermarket suppliers, Ground Effects Ltd.
Award: Ground effects vehicles, motor vehicles, trailers &
The vehicle features a special matte 'Drone Yellow' paint job and a Mopar ground effects kit combined with graphics on either side of the truck, 24-inch Vellano VRH black wheels and a two-inch King Suspension drop kit.
UNLIMITED CUSTOMIZATION: Totally customize any of the 24 unique tuners, Euros, muscle cars, and hot rods with rims, spoilers, exhausts, intakes, decals, paintjobs, and even neon ground effects.
Ground Effects LLC, a Canada-based auto supplier, is planning to invest USD4.
Pioneer's Scion tC built by Sixth Avenue Electronics features a hand-laid, wide-body ground effects kit, candy apple paint job, 19-inch wheels and a full-blown navigation, audio and video system.
Exterior accessories include ground effects, exhaust tip, spoiler, mirror caps, grille surrounds, graphics and 16- or 17-inch painted alloy wheels
The vehicle features a black body, 20-inch 'Gianna Crown' alloys with light blue accents, along with a light blue ground effects kit and a chrome finish for the front grille, window surrounds and side steps.
Boeing released two videos highlighting flutter and ground effects testing.
Giving this Versa attitude is an Extreme fascia, ground effects with side air inlets, hood scoop, custom grille, fog lamps and a racy rear wing.

Full browser ?