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Weathervaning or weathercocking is a phenomenon experienced by aircraft on the ground and rotorcraft on the ground and when hovering. Aircraft on the ground have a natural pivoting point on a plane through the main landing gear contact points [disregarding the effects of toe in/toe out of the main gear]. As most of the side area of an aircraft will typically be behind this pivoting point, any crosswind will create a yawing moment tending to turn the nose of the aircraft into the wind. It is not to be confused with directional stability, as experienced by aircraft in flight.

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  • L'efecte penell (en anglès weathervaning) és un fenomen experimentat per aeronaus a terra i per aeronaus d'ala giratòria tant a terra com a l'aire. L'aeronau a terra té un punt de pivotatge natural en un eix a través dels punts de contacte del tren d'aterratge principal (deixant de banda els efectes de del tren principal). Com que la majoria de l'àrea lateral d'una aeronau es troba darrere d'aquest punt de pivotatge, qualsevol vent creuat crearà un moment de guinyada que tendeix a fer girar el morro de l'aeronau. No s'ha de confondre amb l'estabilitat direccional, ja que aquesta les aeronaus l'experimenten durant el vol. El terme també fa referència a un fenomen similar en petits coets guiats per aletes que, quan s'enlairen verticalment, tendiran a seguir un camí de vol que els farà anar amunt. (ca)
  • Weathervaning or weathercocking is a phenomenon experienced by aircraft on the ground and rotorcraft on the ground and when hovering. Aircraft on the ground have a natural pivoting point on a plane through the main landing gear contact points [disregarding the effects of toe in/toe out of the main gear]. As most of the side area of an aircraft will typically be behind this pivoting point, any crosswind will create a yawing moment tending to turn the nose of the aircraft into the wind. It is not to be confused with directional stability, as experienced by aircraft in flight. The term also refers to a similar phenomenon in fin-guided small rockets which, when launched vertically, will tend to turn into a flight path that takes them upwind. (en)
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  • L'efecte penell (en anglès weathervaning) és un fenomen experimentat per aeronaus a terra i per aeronaus d'ala giratòria tant a terra com a l'aire. L'aeronau a terra té un punt de pivotatge natural en un eix a través dels punts de contacte del tren d'aterratge principal (deixant de banda els efectes de del tren principal). Com que la majoria de l'àrea lateral d'una aeronau es troba darrere d'aquest punt de pivotatge, qualsevol vent creuat crearà un moment de guinyada que tendeix a fer girar el morro de l'aeronau. (ca)
  • Weathervaning or weathercocking is a phenomenon experienced by aircraft on the ground and rotorcraft on the ground and when hovering. Aircraft on the ground have a natural pivoting point on a plane through the main landing gear contact points [disregarding the effects of toe in/toe out of the main gear]. As most of the side area of an aircraft will typically be behind this pivoting point, any crosswind will create a yawing moment tending to turn the nose of the aircraft into the wind. It is not to be confused with directional stability, as experienced by aircraft in flight. (en)
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  • Efecte penell (ca)
  • Weathervane effect (en)
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