Angle of Attack <받음각

Angle of Attack is used to define the angle between the wing chord line and the flight path—not the ground. During landing, an aircraft may have a level attitude, but a high angle of attack, because the flight path is downward and the approaching wind is parallel to the flight path. During climb, the airplane can be in a nose-high attitude, but at a low angle of attack.

wing chord ->2011/02/06 - [항공기/전투기] - Aircraft 에어포일(Airfoils)과 베르누이 원리

Angle of Attack is used to define the angle between the wing chord line and the flight path. This is not to be confused with the relation of the aircraft to the Earth뭩 surface. This is called the attitude and is seldom, if ever, the same as the angle of attack.

When the angle is small, the aircraft is said to be at a low angle of attack. When the angle is large, the aircraft is said to be at a high angle of attack.

Two variables can change the amount of lift generated by a wing in a given configuration.

� The speed of air flowing over the airfoil. � The angle of attack.

An increase in speed or the angle of attack will increase both lift and drag. In level flight, lift must equal the weight of the aircraft. If an aircraft weighs 2,000 lbs., the wing must generate 2,000 lbs. of lift. The speed and angle of attack are interchangeable to a point—therefore, for every airspeed, there is a corresponding angle of attack that will produce the same amount of lift.    속도와 받음각에서의 증가는 항공기를 들어올리면서[양력] 뒤로 끌어당기는 [항력]을 증가시킨다. 수평고도를 유지하는 데는 뜨는 양력과 무게가 같다. 만약 항공기가 2000파운드면 항력도 2000파운드여야 수평고도를 유지한다.  The speed and angle of attack are interchangeable to a point 뭔말인지 모르겠지만요 그래서 모든 공기속도에 따라 그에 상응하는 양력의 같은양을 만들어내는 받음각이 있습니다. 뭐 속도와 받음각이 딱 어떻게 맞았을경우 수평을 유지하게된다는거 같습니다. 속도가 낮은데 받음각이 켜지면 stall에 빠지게 되구요. 적절한 속도와 받음각의 변화로 양력을 증가시키거나 반대로 하강할수 있게된다~ 이말인거같습니다. 다시말해서 그러니까 아래 그림은 첫번째는 낮은 받음각을 가지고있고 적정한 속도를 갖게되면 수평을 유지하겠죠. 두번째그림은 높은 받음각을 가지고있습니다. 높은 받음각은 항력을 증가시키고 양력을 증가시켜 속력이 감소되는 대신에 항공기의 방향은 위로향하게 되어 상승됩니다. 세번째그림은 너무 높은 받음각으로 인해 또는 받음각에 상응하는 항공기의 속도를 받지못해 stall에 빠진 경우입니다.  stall에 빠진경우 받음각을 감소시킴으로써 복구될수있습니다. 라고 쓰다보니까 아래 그림설명에 적혀있었네요. Drag ->2011/02/22 - [항공기/전투기] - 항공기에 작용하는 4가지 힘

In order for a wing to produce lift, the air flowing past an aircraft, must be aligned to the airfoil in order to provide a smooth airflow. As a wing increases its angle of attack, airflow can no longer flow smoothly over the wing and eddies or burbles will form, causing the wing to approach its stall speed. When a wing finally stalls, it will no longer produce lift and with weight unopposed by lift, the aircraft will drop towards the ground. With sufficient altitude, stall recovery can be obtained by decreasing the angle of attack.

Angle of Attack is the angle between the wing chord line and the flight path. 받음각은 비행방향과 날개시위선의 각도입니다. An airplane can be stalled at any attitude and at any airspeed such as pulling out of a dive too abruptly or if the airplane is in a steep turn at a high angle of attack, even though the airspeed is high. During dives or turns, centrifugal force will increase load factors and if excessive, this will cause the wing to stall. The angle of attack should not be confused with the angle of incidence. The angle of incidence is the angle formed by the wing chord line and the aircraft longitudinal axis. Refer to the page on relative wind for comparison.