Inglês/Português
<< retreating blade | retreating blade stall | reversal roll >>
Back to: "R"retreating blade stall
- Definição1
- A stall that begins at or neat the tip of a blade in a helicopter because of the high angles of attack required to compensate for dissymetry of lift. In a gyroplane the stall occurs at 20 to 40 percent outboard form the hub.
- Fonte1
- 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.
- Definição2
- The stall of a helicopter rotor disc that near tip of the retreating blade. A retreating blade stall occurs when the helicopter airspeed is high and the retreating blade airspeed is low. This results in a high angle of attack, which causes the stall.
- Fonte2
- CRANE, Dale (ed.). Dictionary of aeronautical terms. 4th ed. Newcastle: ASA, 2006.
- Contexto
- Treating blade stall is a major factor in limiting a helicopter 's top forward speed (VNE) and can be felt developing by a low frequency vibration , pitching up of the nose, and a roll in the direction of the retreating blade. High weight, low rotor r.p.m., high density altitude, turbulence and/or steep, abrupt turns are all conducive to retreating blade stall at high forward air speeds. As altitude is increased, higher blade angles are required to maintain lift at a given airspeed. Thus, retreating blade stall is encountered at a lower forward airspeed at altitude. Most manufacturers publish charts and graphs showing a VNE decrease with altitude.
- Subárea
- Piloting
- Related Term
- retreating blade
- Português
- estol da pá que recua
