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ground effect
- Definição1
- A condition of improved performance (lift) due to the interference of the surface with the airflow pattern of the rotor system when a helicopter or other VTOL aircraft is operating near the ground.
- Fonte1
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. International civil aviation vocabulary. 3rd ed. Montreal, 2007. (Doc. 9713)
- Definição2
- An increase in lift of an aerodynamic flying machine (airplane or helicopter) flying very near the ground. This additional lift is caused by an effective increase in angle of attack without the accompanying increase in induced drag and is caused by the deflectiion of the downwashed air. Ground effect disappears when the flying machine is about a half wing span of half rotor span above the surface.
- Fonte2
- CRANE, Dale (ed.). Dictionary of aeronautical terms. 2nd ed. Renton: ASA, 1991.
- Definição3
- Additional lift obtained when the helicopter is hovering within one rotor diameter of the ground due to increased air pressure below the rotor disc.
- Fonte3
- SCHAFER, Joe. Helicopter maintenance. Englewood: Jeppesen Sanderson, Inc., c2007. viii, 343 p.
- Definição4
- A usually beneficial influence on rotorcraft performance that occurs while flying close to the ground. It results from a reduction in upwash, downwash, and bladetip vortices, which provide a corresponding decrease in induced drag.
- Fonte4
- FEDERAL AVIATION ADMINISTRATION. Rotorcraft flying handbook (FAA-H-8083-21). Washington, DC: FAA, 2000. Disponível em: http://www.faa.gov/library/manuals/aircraft/media/faa-h-8083-21.pdf. Acesso em: 10 fev. 2012.
- Subárea
- Aerodynamics
- Related Term
- out of ground effect
- Français
- effet de sol
- Imagem
A landing Mooney in ground effect, self-created 2006 by Dr. Wessmann.
Fonte: http://ca.wikipedia.org/wiki/Fitxer:Ground_effect_of_a_landing_aircraft.jpg
