AngleOfSideslip definition

[aidanjungo]

In the CPACS Documentation I cannot find the definition of the AngleOf sideslip (I mean in which direction it's positive). I imagine it is positive on figure bellow.

As CPACS do not follow the conventional way of defining the aerodynamic angle, I think it could be better to have a similar schema on the main page of the documentation (if it not exist somewhere else).

[MarAlder]

Is it not covered by this picture from the main page of the documentation?:

As it is a right-handed CS it should be the one you described in your figure, I would say. Should we add this to the description?

[aidanjungo]

Thanks, yes I think we can guess from this figure, but as these angles can be tricky, I think it could avoid some doubts to have top view figure.

[CLiersch]

The signs of AngleOfAttack (AoA) and AngleOfSideslip (AoS) are both defined in line with the German LN9300 standard - even though the CPACS coordinate system itself is different (x from nose to tail, z upwards). In CPACS, the angles are defined as positive going from inflow to body axis with a positive rotation around the CPACS axes. That means:

• AoA is positive if the flow comes from below (y axis positive to the right (view from top) -> positive rotation from flow to aircraft is upwards)
• AoS is positive if the flow comes from the right (viewed from top) (z axis positive upwards -> positive rotation from flow to aircraft is from right to left).

[MarAlder]

Thanks for the clearification. Let's put this into the docs via #800 (when #781 is resolved).