Weathervane effect
（重定向自Weathercocking）
Weathervaning or weathercocking is a phenomenon experienced by aircraft on the ground.
Aircraft on the ground have a natural pivoting point on an axis 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.