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JSBSim Aerodynamics: Difference between revisions
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* '''Wind XYZ''' The wind frame X-axis points directly into the relative wind. The Y-axis is perpendicular to the X-axis, and remains within the aircraft body axis XZ plane (also called the reference plane). The Z-axis completes a right hand coordinate system. The origin of this frame is the AeroRP. | * '''Wind XYZ''' The wind frame X-axis points directly into the relative wind. The Y-axis is perpendicular to the X-axis, and remains within the aircraft body axis XZ plane (also called the reference plane). The Z-axis completes a right hand coordinate system. The origin of this frame is the AeroRP. | ||
* '''Wind UVW''' This isn't really a frame, but it is | * '''Wind UVW''' This isn't really a frame, but it is the components of the wind velocity vector. The relative wind is imposed on the body frame using variables U,V, and W. U to represent the velocity of the wind flowing past the aircraft. U represents the wind blowing down the X or longitudinal axis of the aircraft. V represents the wind blowing down the body frame Y axis, that is, wind in your ear. W represents wind blowing down the body frame Z axis, or wind from above. | ||
==Angles== | ==Angles== | ||
These two angles define the direction the relative wind is blowing in regard to the body frame. | These two angles define the direction the relative wind is blowing in regard to the body frame. | ||
* '''Alpha''' Alpha is the angle between the X body axis and the X wind axis measured on the UV plane. In standard aerodynamics Alpha is often referenced to the main wing chord line, this is not the case in [[JSBSim]]. | * '''Alpha''' Alpha is the angle between the X body axis and the X wind axis measured on the UV plane. In standard aerodynamics Alpha is often referenced to the main wing chord line, this is not the case in [[JSBSim]]. | ||
* '''Beta''' Beta is the angle between the X body axis and the X wind axis measured | * '''Beta''' Beta is the angle between the X body axis and the X wind axis measured in the UW plane. | ||
== QBar == | == QBar == | ||